Documentation update; added more sections under modules, reduced amount of cruft generated by doxygen.
This commit is contained in:
Sears Russell
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2929394b31
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18 changed files with 1930 additions and 223 deletions
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@ -15,7 +15,6 @@ ACLOCAL_AMFLAGS = -I m4
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#-Wconversion
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#-Wconversion
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docs:
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docs:
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doxygen doc/Doxyfile-api
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doxygen doc/Doxyfile-developers
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doxygen doc/Doxyfile-developers
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tidy: precoverage
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tidy: precoverage
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style="font-size:12px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
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x="214.82077"
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style="font-size:12px;font-style:normal;font-weight:normal;text-align:center;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
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id="tspan7784">Tuple Store</tspan></text>
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xml:space="preserve"
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|
style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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x="254.27417"
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id="tspan7796">Indices / Ref.</tspan><tspan
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xml:space="preserve"
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style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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x="138.55492"
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y="257.99677">Allocation and</tspan><tspan
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x="138.55492"
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id="tspan7806">space mgmt</tspan></text>
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xml:space="preserve"
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|
style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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y="265.31216">Recovery</tspan></text>
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||||||
|
<text
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||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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id="text7812"><tspan
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id="tspan7816">Page formats</tspan><tspan
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id="tspan7820">/ metadata</tspan></text>
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||||||
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<text
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||||||
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xml:space="preserve"
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||||||
|
style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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x="131.10391"
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||||||
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y="303.46695"
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id="text7822"><tspan
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id="tspan7824"
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x="131.10391"
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y="303.46695">Buffer</tspan><tspan
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x="131.10391"
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y="318.46695"
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id="tspan7826">Manager</tspan></text>
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||||||
|
<text
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||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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x="216.87192"
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||||||
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y="310.78241"
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id="text7828"><tspan
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id="tspan7830"
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x="216.87192"
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y="310.78241">Logger</tspan></text>
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||||||
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<text
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||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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||||||
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x="303.62094"
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||||||
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y="304.15839"
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id="text7832"><tspan
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sodipodi:role="line"
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||||||
|
id="tspan7834"
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||||||
|
x="303.62094"
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||||||
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y="304.15839">Page eviction</tspan><tspan
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||||||
|
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||||||
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x="303.62094"
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||||||
|
y="319.15839"
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||||||
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id="tspan7836">LRU/DBMIN/?</tspan></text>
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||||||
|
<text
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||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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||||||
|
x="222.21266"
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||||||
|
y="343.75693"
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id="text7842"><tspan
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||||||
|
sodipodi:role="line"
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||||||
|
id="tspan7844"
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||||||
|
x="222.21266"
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||||||
|
y="343.75693">OS Wrappers: I/O, Memory mgmt</tspan><tspan
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||||||
|
sodipodi:role="line"
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||||||
|
x="222.21266"
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||||||
|
y="358.75693"
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||||||
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id="tspan7846">Threading, etc...</tspan></text>
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||||||
|
<text
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||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:19"
|
||||||
|
x="27.8965"
|
||||||
|
y="294.55219"
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id="text7848"
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||||||
|
inkscape:export-xdpi="115.42"
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||||||
|
inkscape:export-ydpi="115.42"><tspan
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||||||
|
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||||||
|
x="27.8965"
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||||||
|
y="294.55219"
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||||||
|
style="font-size:19"
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||||||
|
id="tspan9828">Stasis</tspan><tspan
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||||||
|
sodipodi:role="line"
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||||||
|
x="27.8965"
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||||||
|
y="318.30219"
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style="font-size:19"
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|
id="tspan9834">Core</tspan><tspan
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|
sodipodi:role="line"
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||||||
|
x="27.8965"
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|
y="342.05219"
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|
style="font-size:19"
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|
id="tspan9830">Library</tspan></text>
|
||||||
|
<text
|
||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:16px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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||||||
|
x="330.97623"
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||||||
|
y="226.31837"
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id="text7852"><tspan
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|
sodipodi:role="line"
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id="tspan7854"
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|
x="330.97623"
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|
y="226.31837">Operations API</tspan></text>
|
||||||
|
<text
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||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:16px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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|
x="415.38751"
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|
y="265.61475"
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|
id="text7864"><tspan
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|
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|
id="tspan7866"
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|
x="415.38751"
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y="265.61475">Record API</tspan></text>
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||||||
|
<text
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||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:16px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:center;text-decoration:none;line-height:normal;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:middle;opacity:1;color:#000000;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;marker:none;marker-start:none;marker-mid:none;marker-end:none;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Bitstream Vera Sans"
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||||||
|
x="423.41174"
|
||||||
|
y="300.4202"
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|
id="text7868"><tspan
|
||||||
|
sodipodi:role="line"
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||||||
|
id="tspan7870"
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||||||
|
x="423.41174"
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||||||
|
y="300.4202">Transactional</tspan><tspan
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||||||
|
sodipodi:role="line"
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||||||
|
x="423.41174"
|
||||||
|
y="320.4202"
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|
id="tspan7872">Page API</tspan></text>
|
||||||
|
<text
|
||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:19;text-anchor:middle;text-align:center"
|
||||||
|
x="69.480774"
|
||||||
|
y="198.53194"
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|
id="text9820"><tspan
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||||||
|
sodipodi:role="line"
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||||||
|
x="69.480774"
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|
y="198.53194"
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||||||
|
style="font-size:19;text-anchor:middle;text-align:center"
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||||||
|
id="tspan9822">Stasis</tspan><tspan
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||||||
|
sodipodi:role="line"
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||||||
|
x="69.480774"
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||||||
|
y="222.28194"
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||||||
|
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id="tspan9824">Extensions</tspan></text>
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||||||
|
d="M 23.73458,173.59036 C 26.98595,173.79059 37.72495,169.10647 41.03185,168.59737 C 47.42107,167.61374 53.51275,168.35518 59.4102,169.26311 C 65.55961,170.20981 72.27975,171.98537 77.78855,173.2575 C 82.43548,174.33059 90.4114,174.58896 96.16691,174.58896 C 102.15465,174.58896 108.91685,173.309 113.46418,172.25889 C 118.64365,171.06282 121.14777,170.2617 128.59929,170.2617 C 135.62034,170.2617 139.15766,170.53629 143.73441,171.59317 C 150.29911,173.10913 150.6534,172.59177 152.38304,172.59177"
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|
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|
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|
||||||
|
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|
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|
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|
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|
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|
||||||
|
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|
||||||
|
y="156.20139" />
|
||||||
|
<text
|
||||||
|
xml:space="preserve"
|
||||||
|
style="font-size:12px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
|
||||||
|
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|
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|
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|
id="text11786"><tspan
|
||||||
|
sodipodi:role="line"
|
||||||
|
id="tspan11788"
|
||||||
|
x="308.31888"
|
||||||
|
y="177.37405">Lock Manager</tspan></text>
|
||||||
|
<path
|
||||||
|
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|
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|
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|
||||||
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||||||
|
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|
||||||
|
</svg>
|
||||||
|
After Width: | Height: | Size: 32 KiB |
50
doc/modules
Normal file
50
doc/modules
Normal file
|
|
@ -0,0 +1,50 @@
|
||||||
|
/**
|
||||||
|
@defgroup LLADD_CORE
|
||||||
|
*//**
|
||||||
|
@defgroup BUFFER_MANAGER
|
||||||
|
@ingroup LLADD_CORE
|
||||||
|
*//** @defgroup BUFFER_MANAGER_IMPLEMENTATIONS
|
||||||
|
@ingroup BUFFER_MANAGER
|
||||||
|
*//**
|
||||||
|
@defgroup PAGE_EVICTION
|
||||||
|
@ingroup BUFFER_MANAGER
|
||||||
|
*//**
|
||||||
|
@defgroup LOGGER
|
||||||
|
@ingroup LLADD_CORE
|
||||||
|
*//**
|
||||||
|
@defgroup LOGGING_DISCIPLINES
|
||||||
|
@ingroup LOGGER
|
||||||
|
*//**
|
||||||
|
@defgroup RECOVERY
|
||||||
|
@ingroup LLADD_CORE
|
||||||
|
*//**
|
||||||
|
@defgroup PAGE_FORMATS
|
||||||
|
*//**
|
||||||
|
@defgroup PAGE_HOWTO
|
||||||
|
@ingroup PAGE_FORMATS
|
||||||
|
*//**
|
||||||
|
@defgroup PAGE_HEADER
|
||||||
|
@ingroup PAGE_FORMATS
|
||||||
|
*//**
|
||||||
|
@defgroup PAGE_UTIL
|
||||||
|
@ingroup PAGE_FORMATS
|
||||||
|
*//**
|
||||||
|
@defgroup PAGE_RECORD_INTERFACE
|
||||||
|
@ingroup PAGE_FORMATS
|
||||||
|
*//**
|
||||||
|
@defgroup PAGE_IMPLEMENTATIONS
|
||||||
|
@ingroup PAGE_FORMATS
|
||||||
|
*//**
|
||||||
|
@defgroup ALLOCATION
|
||||||
|
*//**
|
||||||
|
@defgroup OPERATIONS
|
||||||
|
*//**
|
||||||
|
@defgroup COLLECTIONS
|
||||||
|
@ingroup OPERATIONS
|
||||||
|
*//**
|
||||||
|
@defgroup ARRAY_LIST
|
||||||
|
@ingroup COLLECTIONS
|
||||||
|
*//**
|
||||||
|
@defgroup ROSE
|
||||||
|
@ingroup OPERATIONS
|
||||||
|
*/
|
||||||
|
|
@ -41,7 +41,9 @@ terms specified in this license.
|
||||||
---*/
|
---*/
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* @file Implementation of in memory buffer pool
|
* @file
|
||||||
|
*
|
||||||
|
* Implementation of in memory buffer pool
|
||||||
*
|
*
|
||||||
* $Id$
|
* $Id$
|
||||||
*
|
*
|
||||||
|
|
|
||||||
|
|
@ -180,7 +180,7 @@ typedef struct nbw_impl {
|
||||||
static inline void freeFastHandle(nbw_impl * impl, const tree_node * n);
|
static inline void freeFastHandle(nbw_impl * impl, const tree_node * n);
|
||||||
|
|
||||||
/** Obtain a slow handle from the pool of existing ones, or obtain a new one
|
/** Obtain a slow handle from the pool of existing ones, or obtain a new one
|
||||||
by calling impl->slow_factory.. */
|
by calling impl.slow_factory. */
|
||||||
static stasis_handle_t * getSlowHandle(nbw_impl * impl) {
|
static stasis_handle_t * getSlowHandle(nbw_impl * impl) {
|
||||||
pthread_mutex_lock(&impl->mut);
|
pthread_mutex_lock(&impl->mut);
|
||||||
stasis_handle_t * slow
|
stasis_handle_t * slow
|
||||||
|
|
|
||||||
|
|
@ -41,7 +41,9 @@ terms specified in this license.
|
||||||
---*/
|
---*/
|
||||||
|
|
||||||
/**
|
/**
|
||||||
@file Abstract log implementation. Provides access to methods that
|
@file
|
||||||
|
|
||||||
|
Abstract log implementation. Provides access to methods that
|
||||||
directly read and write log entries, force the log to disk, etc.
|
directly read and write log entries, force the log to disk, etc.
|
||||||
|
|
||||||
@todo Switch logger2 to use function pointers
|
@todo Switch logger2 to use function pointers
|
||||||
|
|
|
||||||
|
|
@ -12,19 +12,6 @@
|
||||||
#define _XOPEN_SOURCE 600
|
#define _XOPEN_SOURCE 600
|
||||||
#include <math.h>
|
#include <math.h>
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/**
|
|
||||||
Implement resizable arrays, just like java's ArrayList class.
|
|
||||||
|
|
||||||
Essentially, the base page contains a fixed size array of rids
|
|
||||||
pointing at contiguous blocks of pages. Each block is twice as
|
|
||||||
big as the previous block.
|
|
||||||
|
|
||||||
The base block is of type FIXED_PAGE, of int's. The first few slots are reserved:
|
|
||||||
|
|
||||||
*/
|
|
||||||
|
|
||||||
typedef struct {
|
typedef struct {
|
||||||
int firstPage;
|
int firstPage;
|
||||||
int initialSize;
|
int initialSize;
|
||||||
|
|
@ -166,7 +153,6 @@ static compensated_function int TarrayListExtendInternal(int xid, recordid rid,
|
||||||
int blockSize = tlp.initialSize * pow(tlp.multiplier, i);
|
int blockSize = tlp.initialSize * pow(tlp.multiplier, i);
|
||||||
int newFirstPage = TpageAllocMany(xid, blockSize);
|
int newFirstPage = TpageAllocMany(xid, blockSize);
|
||||||
DEBUG("block %d\n", i);
|
DEBUG("block %d\n", i);
|
||||||
/* We used to call OPERATION_INITIALIZE_FIXED_PAGE on each page in current indirection block. */
|
|
||||||
tmp.slot = i + FIRST_DATA_PAGE_OFFSET;
|
tmp.slot = i + FIRST_DATA_PAGE_OFFSET;
|
||||||
/* Iterate over the (large number) of new blocks, clearing their contents */
|
/* Iterate over the (large number) of new blocks, clearing their contents */
|
||||||
/* @todo XXX arraylist generates N log entries initing pages.
|
/* @todo XXX arraylist generates N log entries initing pages.
|
||||||
|
|
|
||||||
|
|
@ -1,6 +1,8 @@
|
||||||
/**
|
/**
|
||||||
|
|
||||||
@file Implements three phase recovery
|
@file
|
||||||
|
|
||||||
|
Implements three phase recovery
|
||||||
|
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|
@ -20,7 +22,7 @@
|
||||||
#include <stasis/operations/prepare.h>
|
#include <stasis/operations/prepare.h>
|
||||||
|
|
||||||
#include <stasis/logger/logHandle.h>
|
#include <stasis/logger/logHandle.h>
|
||||||
/** @todo Get rid of linkedlist.[ch] */
|
/** @todo Get rid of linkedlist */
|
||||||
#include <stasis/linkedlist.h>
|
#include <stasis/linkedlist.h>
|
||||||
#include <stasis/page.h> // Needed for pageReadLSN.
|
#include <stasis/page.h> // Needed for pageReadLSN.
|
||||||
|
|
||||||
|
|
@ -28,7 +30,7 @@
|
||||||
static pblHashTable_t * transactionLSN;
|
static pblHashTable_t * transactionLSN;
|
||||||
static LinkedList * rollbackLSNs = NULL;
|
static LinkedList * rollbackLSNs = NULL;
|
||||||
/** @todo There is no real reason to have this mutex (which prevents
|
/** @todo There is no real reason to have this mutex (which prevents
|
||||||
concurrent aborts, except that we need to protect rollbackLSNs's
|
concurrent aborts), except that we need to protect rollbackLSNs's
|
||||||
from concurrent modifications. */
|
from concurrent modifications. */
|
||||||
static pthread_mutex_t rollback_mutex = PTHREAD_MUTEX_INITIALIZER;
|
static pthread_mutex_t rollback_mutex = PTHREAD_MUTEX_INITIALIZER;
|
||||||
|
|
||||||
|
|
|
||||||
|
|
@ -68,9 +68,7 @@ void setupOperationsTable() {
|
||||||
operationsTable[OPERATION_NOOP] = getNoop();
|
operationsTable[OPERATION_NOOP] = getNoop();
|
||||||
operationsTable[OPERATION_INSTANT_SET] = getInstantSet();
|
operationsTable[OPERATION_INSTANT_SET] = getInstantSet();
|
||||||
operationsTable[OPERATION_ARRAY_LIST_ALLOC] = getArrayListAlloc();
|
operationsTable[OPERATION_ARRAY_LIST_ALLOC] = getArrayListAlloc();
|
||||||
// operationsTable[OPERATION_INITIALIZE_FIXED_PAGE] = getInitFixed();
|
|
||||||
operationsTable[OPERATION_INITIALIZE_PAGE] = getInitializePage();
|
operationsTable[OPERATION_INITIALIZE_PAGE] = getInitializePage();
|
||||||
// operationsTable[OPERATION_UNINITIALIZE_PAGE] = getUnInitPage();
|
|
||||||
|
|
||||||
operationsTable[OPERATION_LINEAR_INSERT] = getLinearInsert();
|
operationsTable[OPERATION_LINEAR_INSERT] = getLinearInsert();
|
||||||
operationsTable[OPERATION_UNDO_LINEAR_INSERT] = getUndoLinearInsert();
|
operationsTable[OPERATION_UNDO_LINEAR_INSERT] = getUndoLinearInsert();
|
||||||
|
|
|
||||||
|
|
@ -73,7 +73,7 @@ terms specified in this license.
|
||||||
When such a value is returned, the transaction aborts, and an
|
When such a value is returned, the transaction aborts, and an
|
||||||
error is passed up to the application.
|
error is passed up to the application.
|
||||||
|
|
||||||
* @ingroup LLADD_CORE
|
@ingroup BUFFER_MANAGER
|
||||||
* $Id$
|
* $Id$
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|
|
||||||
|
|
@ -43,7 +43,9 @@ terms specified in this license.
|
||||||
/**
|
/**
|
||||||
* @file
|
* @file
|
||||||
*
|
*
|
||||||
* New version of logger. Based on logger.h
|
* Interface to Stasis' log file.
|
||||||
|
*
|
||||||
|
* @ingroup LOGGING_DISCIPLINE
|
||||||
*
|
*
|
||||||
* $Id$
|
* $Id$
|
||||||
*
|
*
|
||||||
|
|
|
||||||
|
|
@ -45,10 +45,21 @@ terms specified in this license.
|
||||||
*
|
*
|
||||||
* Interface for defining new logical operations.
|
* Interface for defining new logical operations.
|
||||||
*
|
*
|
||||||
* @ingroup LLADD_CORE OPERATIONS
|
* @ingroup OPERATIONS
|
||||||
* @todo The functions in operations.h don't belong in the API, but it defines some constants and typedefs that should be there.
|
* @todo The functions in operations.h don't belong in the API, but it defines some constants and typedefs that should be there.
|
||||||
* $Id$
|
* $Id$
|
||||||
*/
|
*/
|
||||||
|
/**
|
||||||
|
@defgroup COLLECTIONS Collections
|
||||||
|
|
||||||
|
Stasis provides a number of general-purpose data structures for use
|
||||||
|
by applications.
|
||||||
|
|
||||||
|
Stasis provides a number of general-purpose data structures for use
|
||||||
|
by applications. This section documents these data structures and
|
||||||
|
associated interfaces, such as iterators.
|
||||||
|
*/
|
||||||
|
|
||||||
|
|
||||||
#ifndef __OPERATIONS_H__
|
#ifndef __OPERATIONS_H__
|
||||||
#define __OPERATIONS_H__
|
#define __OPERATIONS_H__
|
||||||
|
|
|
||||||
|
|
@ -40,34 +40,86 @@ permission to use and distribute the software in accordance with the
|
||||||
terms specified in this license.
|
terms specified in this license.
|
||||||
---*/
|
---*/
|
||||||
/**
|
/**
|
||||||
@file
|
@file
|
||||||
|
|
||||||
Implements an extendible array of fixed length records with O(1)
|
@ingroup ARRAY_LIST
|
||||||
complexity for all operations.
|
|
||||||
|
|
||||||
@ingroup OPERATIONS
|
@defgroup ARRAY_LIST ArrayList
|
||||||
|
|
||||||
|
O(1) growable array.
|
||||||
|
|
||||||
|
ArrayList provides an growable array of fixed length records with
|
||||||
|
O(1) complexity for all operations. The list grows by doubling the
|
||||||
|
amount of space it reserves each time the list is extended.
|
||||||
|
Therefore, this data structure can use up to twice as much storage
|
||||||
|
as is strictly necessary.
|
||||||
|
|
||||||
|
These arrays are similar to those in Java's ArrayList class.
|
||||||
|
Essentially, the base page contains a fixed size array of recordid's
|
||||||
|
pointing at contiguous blocks of pages. Each block is twice as big
|
||||||
|
as the previous block.
|
||||||
|
|
||||||
|
The base block is of type FIXED_PAGE, of int values. The first few slots
|
||||||
|
are reserved and store information about the arrayList (size of
|
||||||
|
array entries, number/size of allocated regions, etc.)
|
||||||
|
|
||||||
|
@todo arrayList's base block should store pageid_t values, not ints.
|
||||||
|
|
||||||
|
@ingroup COLLECTIONS
|
||||||
|
|
||||||
$Id$
|
$Id$
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|
||||||
|
/** @ingroup ARRAY_LIST */
|
||||||
|
/** @{ */
|
||||||
#ifndef __ARRAY_LIST_H
|
#ifndef __ARRAY_LIST_H
|
||||||
#define __ARRAY_LIST_H
|
#define __ARRAY_LIST_H
|
||||||
|
|
||||||
|
/** Allocate a new array list.
|
||||||
|
|
||||||
|
@param xid The transaction allocating the new arrayList.
|
||||||
|
|
||||||
|
@param numPages The number of pages to be allocated as part of the
|
||||||
|
first region. (The arraylist starts with zero capacity
|
||||||
|
regardless of this parameter's value.)
|
||||||
|
|
||||||
|
@param multiplier Each time the array list runs out of space, the
|
||||||
|
allocate multipler times more space than last time.
|
||||||
|
|
||||||
|
@param recordSize The size of the things stored in this arrayList.
|
||||||
|
Must fit on a single page (arrayList cannot store blobs.)
|
||||||
|
|
||||||
|
*/
|
||||||
|
|
||||||
compensated_function recordid TarrayListAlloc(int xid, int numPages, int multiplier, int recordSize);
|
compensated_function recordid TarrayListAlloc(int xid, int numPages, int multiplier, int recordSize);
|
||||||
|
/**
|
||||||
|
Extend the ArrayList in place.
|
||||||
|
|
||||||
|
@param xid the transaction performing the expansion
|
||||||
|
@param rid the recordid pointing to the ArrayList.
|
||||||
|
@param slots the number of slots to end to the end of the ArrayList.
|
||||||
|
*/
|
||||||
|
compensated_function int TarrayListExtend(int xid, recordid rid, int slots);
|
||||||
|
/**
|
||||||
|
Do not call this function.
|
||||||
|
|
||||||
|
@deprecated This function is known to be broken, and is only
|
||||||
|
called by a deprecated hash implementation.
|
||||||
|
*/
|
||||||
|
compensated_function int TarrayListInstantExtend(int xid, recordid rid, int slots);
|
||||||
|
/**
|
||||||
|
Get the length of an ArrayList.
|
||||||
|
|
||||||
|
@param xid the transaction performing the expansion
|
||||||
|
@param rid the recordid pointing to the ArrayList.
|
||||||
|
@return The number of items stored in the ArrayList.
|
||||||
|
*/
|
||||||
|
compensated_function int TarrayListLength(int xid, recordid rid);
|
||||||
|
|
||||||
|
/** Used by Tread() and Tset() to map from arrayList index to recordid. */
|
||||||
|
recordid dereferenceArrayListRid(int xid, Page * p, int offset);
|
||||||
|
|
||||||
Operation getArrayListAlloc();
|
Operation getArrayListAlloc();
|
||||||
Operation getInitFixed();
|
/** @} */
|
||||||
Operation getUnInitPage();
|
|
||||||
|
|
||||||
/** Initialized a fixed page with the maximum possible number of slots
|
|
||||||
allocated. The rid.size field is used to determine the size of
|
|
||||||
record that the slots can hold. */
|
|
||||||
#define TinitFixed(xid, rid) Tupdate(xid, rid, NULL, OPERATION_INITIALIZE_FIXED_PAGE)
|
|
||||||
/** Un-initializes a page. */
|
|
||||||
#define TunInitPage(xid, rid) Tupdate(xid, rid, NULL, OPERATION_UNINITIALIZE_PAGE)
|
|
||||||
|
|
||||||
recordid dereferenceArrayListRid(int xid, Page * p, int offset);
|
|
||||||
compensated_function int TarrayListExtend(int xid, recordid rid, int slots);
|
|
||||||
compensated_function int TarrayListInstantExtend(int xid, recordid rid, int slots);
|
|
||||||
compensated_function int TarrayListLength(int xid, recordid rid);
|
|
||||||
#endif
|
#endif
|
||||||
|
|
|
||||||
|
|
@ -87,12 +87,14 @@ void TlsmFree(int xid, recordid tree, lsm_page_deallocator_t dealloc,
|
||||||
/**
|
/**
|
||||||
Lookup a leaf page.
|
Lookup a leaf page.
|
||||||
|
|
||||||
|
@param xid The transaction that is looking up this page
|
||||||
|
|
||||||
|
@param tree The tree to be queried.
|
||||||
|
|
||||||
@param key The value you're looking for. The first page that may
|
@param key The value you're looking for. The first page that may
|
||||||
contain this value will be returned. (lsmTree supports
|
contain this value will be returned. (lsmTree supports
|
||||||
duplicate keys...)
|
duplicate keys...) LSM trees currently store fixed
|
||||||
|
length keys, so there is no keySize parameter.
|
||||||
@param keySize Must match the keySize passed to TlsmCreate.
|
|
||||||
Currently unused.
|
|
||||||
*/
|
*/
|
||||||
pageid_t TlsmFindPage(int xid, recordid tree,
|
pageid_t TlsmFindPage(int xid, recordid tree,
|
||||||
const byte *key);
|
const byte *key);
|
||||||
|
|
|
||||||
103
stasis/page.h
103
stasis/page.h
|
|
@ -48,13 +48,13 @@ terms specified in this license.
|
||||||
* This file provides a re-entrant interface for pages that are labeled
|
* This file provides a re-entrant interface for pages that are labeled
|
||||||
* with an LSN and a page type.
|
* with an LSN and a page type.
|
||||||
*
|
*
|
||||||
* @ingroup LLADD_CORE pageFormats
|
* @ingroup PAGE_FORMATS
|
||||||
*
|
*
|
||||||
* $Id$
|
* $Id$
|
||||||
*/
|
*/
|
||||||
|
|
||||||
/**
|
/**
|
||||||
@defgroup pageFormats Page format implementations
|
@defgroup PAGE_FORMATS Page layouts
|
||||||
|
|
||||||
Stasis allows developers to define their own on-disk page formats.
|
Stasis allows developers to define their own on-disk page formats.
|
||||||
Currently, each page format must end with a hard-coded header
|
Currently, each page format must end with a hard-coded header
|
||||||
|
|
@ -90,7 +90,7 @@ terms specified in this license.
|
||||||
and APIs. However, Stasis's record oriented page interface
|
and APIs. However, Stasis's record oriented page interface
|
||||||
provides a default set of methods for page access.
|
provides a default set of methods for page access.
|
||||||
|
|
||||||
@see pageRecordInterface
|
@see PAGE_RECORD_INTERFACE
|
||||||
|
|
||||||
@todo Page deallocators should call stasis_page_cleanup()
|
@todo Page deallocators should call stasis_page_cleanup()
|
||||||
@todo Create variant of loadPage() that takes a page type
|
@todo Create variant of loadPage() that takes a page type
|
||||||
|
|
@ -196,8 +196,7 @@ struct Page_s {
|
||||||
/*@}*/
|
/*@}*/
|
||||||
|
|
||||||
/**
|
/**
|
||||||
@defgroup pageLSNHeaderGeneric LSN and Page Types
|
@defgroup PAGE_HEADER Default page header
|
||||||
@ingroup pageFormats
|
|
||||||
|
|
||||||
Most Stasis pages contain an LSN and a page type. These are used
|
Most Stasis pages contain an LSN and a page type. These are used
|
||||||
by recovery to determine whether or not to perform redo. At
|
by recovery to determine whether or not to perform redo. At
|
||||||
|
|
@ -279,8 +278,7 @@ lsn_t stasis_page_lsn_read(const Page * page);
|
||||||
/*@}*/
|
/*@}*/
|
||||||
|
|
||||||
/**
|
/**
|
||||||
@defgroup pageUtils Utility methods for page manipulation
|
@defgroup PAGE_UTIL Byte-level page manipulation
|
||||||
@ingroup pageFormats
|
|
||||||
|
|
||||||
These methods make it easy to manipulate pages that use a standard
|
These methods make it easy to manipulate pages that use a standard
|
||||||
Stasis header (one with an LSN and page type).
|
Stasis header (one with an LSN and page type).
|
||||||
|
|
@ -291,6 +289,60 @@ lsn_t stasis_page_lsn_read(const Page * page);
|
||||||
Methods with "_ptr_" in their names take non-const pages, and
|
Methods with "_ptr_" in their names take non-const pages, and
|
||||||
return non-const pointers.
|
return non-const pointers.
|
||||||
|
|
||||||
|
@par Implementing new pointer arithmetic macros
|
||||||
|
|
||||||
|
Stasis page type implementations typically do little more than
|
||||||
|
pointer arithmetic. However, implementing page types cleanly and
|
||||||
|
portably is a bit tricky. Stasis has settled upon a compromise in
|
||||||
|
this matter. Its page file formats are compatible within a single
|
||||||
|
architecture, but not across systems with varying lengths of
|
||||||
|
primitive types, or that vary in endianness.
|
||||||
|
|
||||||
|
Over time, types that vary in length such as "int", "long", etc
|
||||||
|
will be removed from Stasis, but their usage still exists in a few
|
||||||
|
places. Once they have been removed, file compatibility problems
|
||||||
|
should be limited to endianness (though application code will still
|
||||||
|
be free to serialize objects in a non-portable manner).
|
||||||
|
|
||||||
|
Most page implementations leverage C's pointer manipulation
|
||||||
|
semantics to lay out pages. Rather than casting pointers to
|
||||||
|
char*'s and then manually calculating byte offsets using sizeof(),
|
||||||
|
the existing page types prefer to cast pointers to appropriate
|
||||||
|
types, and then add or subtract the appropriate number of values.
|
||||||
|
|
||||||
|
For example, instead of doing this:
|
||||||
|
|
||||||
|
@code
|
||||||
|
// p points to an int, followed by a two bars, then the foo whose address
|
||||||
|
// we want to calculate
|
||||||
|
|
||||||
|
int * p;
|
||||||
|
foo* f = (foo*)( ((char*)p) + sizeof(int) + 2 * sizeof(bar))
|
||||||
|
@endcode
|
||||||
|
|
||||||
|
the implementations would do this:
|
||||||
|
|
||||||
|
@code
|
||||||
|
int * p;
|
||||||
|
foo * f = (foo*)( ((bar*)(p+1)) + 2 )
|
||||||
|
@endcode
|
||||||
|
|
||||||
|
The main disadvantage of this approach is the large number of ()'s
|
||||||
|
involved. However, it lets the compiler deal with the underlying
|
||||||
|
multiplications, and often reduces the number of casts, leading to
|
||||||
|
slightly more readable code. Take this implementation of
|
||||||
|
stasis_page_type_ptr(), for example:
|
||||||
|
|
||||||
|
@code
|
||||||
|
int * stasis_page_type_ptr(Page *p) {
|
||||||
|
return ( (int*)stasis_page_lsn_ptr(Page *p) ) - 1;
|
||||||
|
}
|
||||||
|
@endcode
|
||||||
|
|
||||||
|
Here, the page type is stored as an integer immediately before the
|
||||||
|
LSN pointer. Using arithmetic over char*'s would require an extra
|
||||||
|
cast to char*, and a multiplication by sizeof(int).
|
||||||
|
|
||||||
*/
|
*/
|
||||||
/*@{*/
|
/*@{*/
|
||||||
static inline byte*
|
static inline byte*
|
||||||
|
|
@ -365,14 +417,37 @@ void stasis_page_init();
|
||||||
void stasis_page_deinit();
|
void stasis_page_deinit();
|
||||||
|
|
||||||
/**
|
/**
|
||||||
@defgroup pageRecordInterface Record-oriented page interface
|
@defgroup PAGE_RECORD_INTERFACE Record interface
|
||||||
@ingroup pageFormats
|
@ingroup PAGE_FORMATS
|
||||||
|
|
||||||
|
Page formats define the layout of data on pages. Currently, all
|
||||||
|
pages contain a header with an LSN and a page type in it. This
|
||||||
|
information is used by recovery and the buffer manager to invoke
|
||||||
|
callbacks at appropriate times. (LSN-free pages are currently not
|
||||||
|
supported.)
|
||||||
|
|
||||||
|
Stasis' record-oriented page interface uses the page type to determine
|
||||||
|
which page implementation should be used to access or modify
|
||||||
|
records. This API's functions begin with "stasis_record". Two
|
||||||
|
commonly used examples are stasis_read_record() and
|
||||||
|
stasis_write_record().
|
||||||
|
|
||||||
|
This interface is not re-entrant. Rather, page implementations
|
||||||
|
assume that their callers will latch pages using
|
||||||
|
readLock(p->rwlatch) and writeLock(p-rwlatch) before attempting to
|
||||||
|
access the page. A second latch, p->loadlatch, should not be
|
||||||
|
acquired by page manipulation code. Instead, it is used by the
|
||||||
|
buffer manager to protect against races during page eviction.
|
||||||
|
|
||||||
|
@par Registering new page type implementations
|
||||||
|
|
||||||
|
Page implementations are registered with Stasis by passing a
|
||||||
|
page_impl struct into registerPageType(). page_impl.page_type
|
||||||
|
should contain an integer that is unique across all page types,
|
||||||
|
while the rest of the fields contain function pointers to the page
|
||||||
|
type's implementation.
|
||||||
|
|
||||||
|
|
||||||
Stasis provides a default record-oriented interface to page
|
|
||||||
implementations. By defining these methods, and registering
|
|
||||||
appropriate callbacks, page implementations allow callers to
|
|
||||||
access their data through standard Stasis methods such as Tread()
|
|
||||||
and Tset().
|
|
||||||
*/
|
*/
|
||||||
/*@{*/
|
/*@{*/
|
||||||
static const size_t USABLE_SIZE_OF_PAGE = (PAGE_SIZE - sizeof(lsn_t) - sizeof(int));
|
static const size_t USABLE_SIZE_OF_PAGE = (PAGE_SIZE - sizeof(lsn_t) - sizeof(int));
|
||||||
|
|
|
||||||
|
|
@ -56,13 +56,59 @@ terms specified in this license.
|
||||||
/**
|
/**
|
||||||
@mainpage Introduction to Stasis
|
@mainpage Introduction to Stasis
|
||||||
|
|
||||||
This is the main section.
|
Stasis is a <i>flexible</i> transactional storage library. Unlike
|
||||||
<ul>
|
existing systems, it provides application and server developers
|
||||||
<li>@ref gettingStarted</li>
|
with much freedom, but little guidance regarding page file layouts,
|
||||||
<li>@ref pageFormats</li>
|
data models, and concurrency schemes. This often means that Stasis
|
||||||
<li>@ref LLADD_CORE</li>
|
can outperform general purpose storage solutions by orders of
|
||||||
<li>@ref OPERATIONS</li>
|
magnitude, but it does require more effort on the part of its end
|
||||||
</ul>
|
users. We are in the process of implementing a library of commonly
|
||||||
|
used, general-purpose transactional data structures on top of
|
||||||
|
Stasis.
|
||||||
|
|
||||||
|
@section The Stasis data model
|
||||||
|
|
||||||
|
Stasis does not really have a data model. While designing and
|
||||||
|
implementing Stasis, we focused on providing end users with
|
||||||
|
<i>mechanisms, not policy</i>. As much as possible, we have
|
||||||
|
avoiding hardcoding application-specific implmentation details such
|
||||||
|
as data formats and concurrency models. Instead, Stasis provides a
|
||||||
|
number of reusable lower-level mechanisms that make it easy for
|
||||||
|
applications to implement custom transactional storage systems.
|
||||||
|
|
||||||
|
At the lowest level, Stasis provides <i>transactional pages</i>;
|
||||||
|
the buffer manager manages a set of pages and regions on disk, and
|
||||||
|
coordinates with the log and other Stasis mechanisms to provide
|
||||||
|
recovery and concurrent transactions. On top of this low level
|
||||||
|
API, we have developed record oriented interfaces that facilitate
|
||||||
|
development and interchangability of new page formats. Conformance
|
||||||
|
to these APIs is recommended, but not required. Stasis records are
|
||||||
|
simply arrays of bytes (not tuples). A Stasis recordid is simply a
|
||||||
|
record that contains a pointer to another record.
|
||||||
|
|
||||||
|
Stasis's @ref OPERATIONS provide a set of methods that manipulate
|
||||||
|
records in a transactional, durable fashion. They are implemented
|
||||||
|
on top of the record (and sometimes page) API's, and range from low
|
||||||
|
level access methods like record reads and writes to higher level
|
||||||
|
data structure implementations, such as hash tables and log-oriented
|
||||||
|
tree indexes. Stasis' library of operations makes use of a number of
|
||||||
|
different @ref LOGGING_DISCIPLINES. Most new operations will want to
|
||||||
|
choose one of these disciplines, as many subtlties arise during the
|
||||||
|
development of new concurrent, high-performance recovery
|
||||||
|
algorithms.
|
||||||
|
|
||||||
|
@image html "StasisDBMS.png" "Stasis' place in a conventional DBMS architecture"
|
||||||
|
|
||||||
|
@section Tutorial
|
||||||
|
|
||||||
|
@ref gettingStarted explains how to download and compile Stasis,
|
||||||
|
and includes a number of sample programs.
|
||||||
|
|
||||||
|
The "Modules" section in the navigation pane contains detailed
|
||||||
|
documentation of Stasis' major components.
|
||||||
|
|
||||||
|
@see <a href="modules.html">Modules</a>
|
||||||
|
|
||||||
*/
|
*/
|
||||||
|
|
||||||
/**
|
/**
|
||||||
|
|
@ -109,11 +155,11 @@ terms specified in this license.
|
||||||
This will fail if your system defaults to an old (pre-1.7) version
|
This will fail if your system defaults to an old (pre-1.7) version
|
||||||
of autotools. Fortunately, multiple versions of autotools may
|
of autotools. Fortunately, multiple versions of autotools may
|
||||||
exist on the same system. Execute the following commands to
|
exist on the same system. Execute the following commands to
|
||||||
compile with version 1.8 of autotools:
|
compile with version 1.8 (or 1.9) of autotools:
|
||||||
|
|
||||||
@code
|
@code
|
||||||
|
|
||||||
$ ./reconf-1.8
|
$ ./reconf-1.8 # or ./reconf-1.9
|
||||||
$ ./configure --quiet
|
$ ./configure --quiet
|
||||||
$ make -j4 > /dev/null
|
$ make -j4 > /dev/null
|
||||||
$ cd test/stasis
|
$ cd test/stasis
|
||||||
|
|
@ -133,7 +179,7 @@ terms specified in this license.
|
||||||
|
|
||||||
@section usage Using Stasis in your software
|
@section usage Using Stasis in your software
|
||||||
|
|
||||||
Synopsis:
|
Synopsis (examples/ex1.c):
|
||||||
|
|
||||||
@include examples/ex1.c
|
@include examples/ex1.c
|
||||||
|
|
||||||
|
|
@ -153,25 +199,27 @@ terms specified in this license.
|
||||||
or naming of objects within the page file. This means that the application
|
or naming of objects within the page file. This means that the application
|
||||||
must maintain such information manually.
|
must maintain such information manually.
|
||||||
|
|
||||||
In order to facilitate this, Stasis provides the function TgetRecordType() and
|
In order to facilitate this, Stasis provides the function
|
||||||
guarantees that the first recordid returned by any allocation will point to
|
TrecordType() and guarantees that the first recordid returned by
|
||||||
the same page and slot as the constant ROOT_RECORD. TgetRecordType
|
any allocation will point to the same page and slot as the constant
|
||||||
will return NULLRID if the record passed to it does not exist.
|
ROOT_RECORD. TrecordType() will return UNINITIALIZED_RECORD if the
|
||||||
|
record passed to it does not exist. A second function,
|
||||||
|
TrecordSize() returns the size of a record in bytes, or -1 if the
|
||||||
|
record does not exist.
|
||||||
|
|
||||||
Therefore, the following code will safely initialize or reopen a data
|
Therefore, the following code (found in examples/ex2.c) will safely
|
||||||
store:
|
initialize or reopen a data store:
|
||||||
|
|
||||||
@include examples/ex2.c
|
@include examples/ex2.c
|
||||||
|
|
||||||
@see test.c for a complete, executable example of reopening an existing store.
|
|
||||||
|
|
||||||
@todo Explain how to determine the correct value of rootEntry.size in the case
|
@todo Explain how to determine the correct value of rootEntry.size in the case
|
||||||
of a hashtable.
|
of a hashtable.
|
||||||
|
|
||||||
|
|
||||||
@see OPERATIONS for more operations that may be useful for your software.
|
@see OPERATIONS for other transactional primitives that may be
|
||||||
|
useful for your software.
|
||||||
|
|
||||||
@subsection consistency Using Stasis in multithreaded applications.
|
@subsection consistency Using Stasis in multithreaded applications
|
||||||
|
|
||||||
Unless otherwise noted, Stasis' operations are re-entrant. This
|
Unless otherwise noted, Stasis' operations are re-entrant. This
|
||||||
means that an application may call them concurrently without
|
means that an application may call them concurrently without
|
||||||
|
|
@ -229,7 +277,7 @@ terms specified in this license.
|
||||||
Stasis components can be classified as follows:
|
Stasis components can be classified as follows:
|
||||||
|
|
||||||
- I/O utilities (file handles, OS compatibility wrappers)
|
- I/O utilities (file handles, OS compatibility wrappers)
|
||||||
- Write ahead logging component interfaces (logger.h, XXX)
|
- Write ahead logging component interfaces (logger.h, logger/inMemoryLog.h logger/logEntry.h logger/logger2.h logger/logHandle.h logger/logMemory.h logger/logWriter.h)
|
||||||
- Write ahead logging component implementations (hash based buffer manager, in memory log, etc...)
|
- Write ahead logging component implementations (hash based buffer manager, in memory log, etc...)
|
||||||
- Page formats and associated operations (page/slotted.c page/fixed.c)
|
- Page formats and associated operations (page/slotted.c page/fixed.c)
|
||||||
- Application visible methods (Talloc, Tset, ThashInsert, etc)
|
- Application visible methods (Talloc, Tset, ThashInsert, etc)
|
||||||
|
|
@ -353,106 +401,50 @@ terms specified in this license.
|
||||||
Interesting files in this part of Stasis include logger2.c,
|
Interesting files in this part of Stasis include logger2.c,
|
||||||
bufferManager.c, and recovery2.c.
|
bufferManager.c, and recovery2.c.
|
||||||
|
|
||||||
@subsection page Page types
|
@subsection page Custom page formats
|
||||||
|
|
||||||
Page types define the layout of data on pages. Currently, all
|
Stasis provides a default @ref PAGE_RECORD_INTERFACE to custom page
|
||||||
pages contain a header with an LSN and a page type in it. This
|
implementations. Methods that define their own log disciplines, or
|
||||||
information is used by recovery and the buffer manager to invoke
|
otherwise need to bypass Stasis' default recovery mechanisms should
|
||||||
callbacks at appropriate times. (LSN-free pages are currently not
|
call into this API.
|
||||||
supported.)
|
|
||||||
|
|
||||||
XXX: This section is not complete.
|
By defining these methods and registering appropriate callbacks,
|
||||||
|
page implementations allow callers to access their data through
|
||||||
@todo Discuss readRecord, writeRecord (high level page access
|
standard Stasis methods such as Tread() and Tset(). This module
|
||||||
methods)
|
also includes a set of utility methods to simplify the pointer
|
||||||
|
arithmetic associated with manipulating the buffer manager's copy
|
||||||
@todo Explain the latching convention. (Also, explain which
|
of pages.
|
||||||
latches are not to be used by page implementations, and which
|
|
||||||
latches may not be used by higher level code.)
|
|
||||||
|
|
||||||
@par Registering new page type implementations
|
|
||||||
|
|
||||||
Page implementations are registered with Stasis by passing a
|
|
||||||
page_impl struct into registerPageType(). page_impl.page_type
|
|
||||||
should contain an integer that is unique across all page types,
|
|
||||||
while the rest of the fields contain function pointers to the page
|
|
||||||
type's implementation.
|
|
||||||
|
|
||||||
@par Pointer arithmetic
|
|
||||||
|
|
||||||
Stasis page type implementations typically do little more than
|
|
||||||
pointer arithmetic. However, implementing page types cleanly and
|
|
||||||
portably is a bit tricky. Stasis has settled upon a compromise in
|
|
||||||
this matter. Its page file formats are compatible within a single
|
|
||||||
architecture, but not across systems with varying lengths of
|
|
||||||
primitive types, or that vary in endianness.
|
|
||||||
|
|
||||||
Over time, types that vary in length such as "int", "long", etc
|
|
||||||
will be removed from Stasis, but their usage still exists in a few
|
|
||||||
places. Once they have been removed, file compatibility problems
|
|
||||||
should be limited to endianness (though application code will still
|
|
||||||
be free to serialize objects in a non-portable manner).
|
|
||||||
|
|
||||||
Most page implementations leverage C's pointer manipulation
|
|
||||||
semantics to lay out pages. Rather than casting pointers to
|
|
||||||
char*'s and then manually calculating byte offsets using sizeof(),
|
|
||||||
the existing page types prefer to cast pointers to appropriate
|
|
||||||
types, and then add or subtract the appropriate number of values.
|
|
||||||
|
|
||||||
For example, instead of doing this:
|
|
||||||
|
|
||||||
@code
|
|
||||||
// p points to an int, followed by a two bars, then the foo whose address
|
|
||||||
// we want to calculate
|
|
||||||
|
|
||||||
int * p;
|
|
||||||
foo* f = (foo*)( ((char*)p) + sizeof(int) + 2 * sizeof(bar))
|
|
||||||
@endcode
|
|
||||||
|
|
||||||
the implementations would do this:
|
|
||||||
|
|
||||||
@code
|
|
||||||
int * p;
|
|
||||||
foo * f = (foo*)( ((bar*)(p+1)) + 2 )
|
|
||||||
@endcode
|
|
||||||
|
|
||||||
The main disadvantage of this approach is the large number of ()'s
|
|
||||||
involved. However, it lets the compiler deal with the underlying
|
|
||||||
multiplications, and often reduces the number of casts, leading to
|
|
||||||
slightly more readable code. Take this implementation of
|
|
||||||
stasis_page_type_ptr(), for example:
|
|
||||||
|
|
||||||
@code
|
|
||||||
int * stasis_page_type_ptr(Page *p) {
|
|
||||||
return ( (int*)stasis_page_lsn_ptr(Page *p) ) - 1;
|
|
||||||
}
|
|
||||||
@endcode
|
|
||||||
|
|
||||||
Here, the page type is stored as an integer immediately before the
|
|
||||||
LSN pointer. Using arithmetic over char*'s would require an extra
|
|
||||||
cast to char*, and a multiplication by sizeof(int).
|
|
||||||
|
|
||||||
@par A note on storage allocation
|
@par A note on storage allocation
|
||||||
|
|
||||||
Finally, while Stasis will correctly call appropriate functions
|
Stasis currently provides a few different mechanisms that allocate
|
||||||
when it encounters a properly registered third party page type, it
|
entire pages and page ranges at once. There are examples of three
|
||||||
currently provides few mechanisms to allocate such pages in the
|
approaches in the current code base:
|
||||||
first place. There are examples of three approaches in the current
|
|
||||||
code base:
|
|
||||||
|
|
||||||
# Implement a full-featured, general purpose allocator, like the
|
- Implement a full-featured, general purpose allocator, like the
|
||||||
one in alloc.h. This is more difficult than it sounds.
|
one in alloc.h. This is more difficult than it sounds.
|
||||||
|
|
||||||
# Allocate entire regions at a time, and manually initialize pages
|
- Allocate entire regions at a time, and manually initialize pages
|
||||||
within them. arrayList.h attempts to do this, but gets it wrong
|
within them. arrayList.h does this. This is the most flexible
|
||||||
by relying upon lazy initialization to eventually set page types
|
and efficient approach, but requires extra management code if
|
||||||
correctly. Doing so is problematic if the page was deallocated,
|
region allocation is not a natural approach.
|
||||||
then reused without being reset.
|
|
||||||
|
|
||||||
# Allocate a single page at a time using TallocPage(), and
|
- Allocate a single page at a time using TallocPage(), then call
|
||||||
TsetPage(). This is currently the most attractive route, though
|
page initialization methods on each page. Currently,
|
||||||
TsetPage() does not call pageLoaded() when it resets page types,
|
TallocPage() is poorly implemented and wastes one page for every
|
||||||
which can lead to trouble.
|
page it allocates.
|
||||||
|
|
||||||
|
Note that before you initialize a new page you need to call
|
||||||
|
stasis_page_cleanup() to notify the page's old format that it should
|
||||||
|
free resources associated with the old version of the page.
|
||||||
|
Stasis' allocation routines guarantee that the pages they return
|
||||||
|
were freed by committed transactions (and therefore, that their
|
||||||
|
contents can be discarded). Therefore, you do not need to log the
|
||||||
|
preimage of pages returned by the allocator.
|
||||||
|
|
||||||
|
@todo Should we change the API so that allocation routines (TpageAlloc(), TregionAlloc()) call stasis_page_cleanup() on behalf of their callers?
|
||||||
|
|
||||||
|
@todo Optimize page, region allocation to call page initializers automatically during forward operation and redo?
|
||||||
|
|
||||||
@see page.h, fixed.h, and slotted.h for more information on the
|
@see page.h, fixed.h, and slotted.h for more information on the
|
||||||
page API's, and the implementations of two common page formats.
|
page API's, and the implementations of two common page formats.
|
||||||
|
|
@ -461,8 +453,7 @@ terms specified in this license.
|
||||||
|
|
||||||
These methods start with "T". Look at the examples above. These
|
These methods start with "T". Look at the examples above. These
|
||||||
are the "wrapper functions" from the OSDI paper. They are
|
are the "wrapper functions" from the OSDI paper. They are
|
||||||
supported by operation implementations, which can be found in the
|
supported by @ref OPERATIONS.
|
||||||
operations/ directory.
|
|
||||||
|
|
||||||
@section extending Implementing you own operations
|
@section extending Implementing you own operations
|
||||||
|
|
||||||
|
|
@ -472,9 +463,6 @@ terms specified in this license.
|
||||||
@see linearHashNTA.h for a more sophisticated example that makes use of Nested Top Actions.
|
@see linearHashNTA.h for a more sophisticated example that makes use of Nested Top Actions.
|
||||||
|
|
||||||
*/
|
*/
|
||||||
/**
|
|
||||||
* @defgroup pageFormats Page format implementations
|
|
||||||
*/
|
|
||||||
/**
|
/**
|
||||||
* @defgroup OPERATIONS Logical Operations
|
* @defgroup OPERATIONS Logical Operations
|
||||||
*
|
*
|
||||||
|
|
@ -483,6 +471,53 @@ terms specified in this license.
|
||||||
* @todo Write a brief howto to explain the implementation of new operations.
|
* @todo Write a brief howto to explain the implementation of new operations.
|
||||||
*
|
*
|
||||||
*/
|
*/
|
||||||
|
/**
|
||||||
|
* @defgroup LOGGING_DISCIPLINES Logging Disciplines
|
||||||
|
*
|
||||||
|
* Stasis' log API provides a number of methods that directly
|
||||||
|
* manipulate the log.
|
||||||
|
*
|
||||||
|
* @section SNF STEAL/NO-FORCE recovery
|
||||||
|
* Stasis includes a function, Tupdate(), that
|
||||||
|
* provides traditional STEAL/NO-FORCE logging for recovery. The
|
||||||
|
* STEAL/NO-FORCE strategy allows dirty, uncommitted pages to be
|
||||||
|
* written back to disk (STEAL), which prevents long running
|
||||||
|
* transactions from exhausting RAM. It does not force write pages to
|
||||||
|
* disk at commit (NO-FORCE), and instead only forces the log. This
|
||||||
|
* prevents the hard drive head from performing unnecessary seeks
|
||||||
|
* during commit. Recovery works by "repeating history"; all actions
|
||||||
|
* are redone up to some point in time after the last successful
|
||||||
|
* transaction committed, but before the crash. Conceptually, any
|
||||||
|
* partially commited transactions are then rolled back using
|
||||||
|
* Tabort(), as they would be during normal operation. For more
|
||||||
|
* information about STEAL/NO-FORCE recovery strategies, see the ARIES
|
||||||
|
* paper (XXX cite aries properly)
|
||||||
|
*
|
||||||
|
*
|
||||||
|
* @section SF STEAL/FORCE and bulk-logged recovery
|
||||||
|
*
|
||||||
|
* Stasis supports other logging disciplines as well. In particular,
|
||||||
|
* the buffer manager allows REGIONS (XXX document region allocator)
|
||||||
|
* to be synchronously written to disk, allowing operations to make
|
||||||
|
* use of a STEAL/FORCE recovery strategy. This is attractive when a
|
||||||
|
* transaction is writing a large, contiguous region of disk, as
|
||||||
|
* STEAL/FORCE operations do not write redo information to the log.
|
||||||
|
* If the STEAL/FORCE transaction is overwriting newly allocated
|
||||||
|
* pages, it can also avoid writing undo information to the log, as
|
||||||
|
* the newly allocated pages do not contain useful data. This allows
|
||||||
|
* large objects to be written with no tangible logging overhead, and
|
||||||
|
* has been implemented by a number of commercial systems. It is used
|
||||||
|
* by the Stasis' Rose indexes. (XXX cite LSM trees, etc.)
|
||||||
|
*
|
||||||
|
* @section LSNFREE LSN-Free pages
|
||||||
|
*
|
||||||
|
* Stasis' third (and most exotic) logging strategy makes use of
|
||||||
|
* LSN-free pages. By constraining the behavior of redo and undo log
|
||||||
|
* entries, we can entirely avoid storing Stasis metadata on pages.
|
||||||
|
* This logging discipline is under development.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* @file
|
* @file
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue