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<div class="aboutLanguage"><b>Berkeley DB Java Edition</b><br><font size=\"-1\"> version 7.5.11</font>
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<div class="subTitle">com.sleepycat.je.rep</div>
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<h2 title="Enum ReplicatedEnvironment.State" class="title">Enum ReplicatedEnvironment.State</h2>
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<div class="contentContainer">
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<li>
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<ul class="inheritance">
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<li>java.lang.Enum<<a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a>></li>
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<li>
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<ul class="inheritance">
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<li>com.sleepycat.je.rep.ReplicatedEnvironment.State</li>
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<dt>All Implemented Interfaces:</dt>
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<dd>java.io.Serializable, java.lang.Comparable<<a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a>></dd>
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</dl>
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<dl>
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<dt>Enclosing class:</dt>
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<dd><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.html" title="class in com.sleepycat.je.rep">ReplicatedEnvironment</a></dd>
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</dl>
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<hr>
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<br>
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<pre>public static enum <span class="typeNameLabel">ReplicatedEnvironment.State</span>
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extends java.lang.Enum<<a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a>></pre>
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<div class="block">The replication node state determines the operations that the
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application can perform against its replicated environment.
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The method <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.html#getState--"><code>ReplicatedEnvironment.getState()</code></a> returns the current state.
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<p>
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When the first handle to a <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.html" title="class in com.sleepycat.je.rep"><code>ReplicatedEnvironment</code></a> is instantiated
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and the node is bought up, the node usually establishes
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<code>MASTER</code> or <code>REPLICA</code> state before returning from
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the constructor. However, these states are actually preceeded by the
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<code>UNKNOWN</code> state, which may be visible if the application has
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configured a suitable <a href="../../../../com/sleepycat/je/rep/ReplicationConfig.html#ENV_UNKNOWN_STATE_TIMEOUT"><code>ReplicationConfig.ENV_UNKNOWN_STATE_TIMEOUT</code></a>.
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<p>
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As the various remote nodes in the group become unavailable and
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elections are held, the local node may change between
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<code>MASTER</code> and <code>REPLICA</code> states, always with a
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(usually brief) transition through <code>UNKNOWN</code> state.
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<p>
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When the last handle to the environment is closed, the node transitions
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to the <code>DETACHED</code> state.
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<p>
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The state transitions visible to the application can be summarized by
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the regular expression:
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<blockquote>
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<code> [ MASTER | REPLICA | UNKNOWN ]+ DETACHED</code>
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</blockquote>
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with the caveat that redundant "transitions" (<code>MASTER</code> to
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<code>MASTER</code>, <code>REPLICA</code> to <code>REPLICA</code>, etc.)
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never occur.</div>
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</li>
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</ul>
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</div>
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<div class="summary">
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<ul class="blockList">
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<li class="blockList">
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<!-- =========== ENUM CONSTANT SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="enum.constant.summary">
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<!-- -->
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</a>
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<h3>Enum Constant Summary</h3>
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<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Enum Constant Summary table, listing enum constants, and an explanation">
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<caption><span>Enum Constants</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colOne" scope="col">Enum Constant and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#DETACHED">DETACHED</a></span></code>
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<div class="block">The node is not associated with the group.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#MASTER">MASTER</a></span></code>
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<div class="block">The node is the unique master of the group and can both read and
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write to its environment.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#REPLICA">REPLICA</a></span></code>
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<div class="block">The node is a replica that is being updated by the master.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#UNKNOWN">UNKNOWN</a></span></code>
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<div class="block">The node is not currently in contact with the master, but is actively
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trying to establish contact with, or decide upon, a master.</div>
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</td>
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</tr>
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</table>
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</li>
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</ul>
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<!-- ========== METHOD SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.summary">
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</a>
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<h3>Method Summary</h3>
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<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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</tr>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#isActive--">isActive</a></span>()</code> </td>
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</tr>
|
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#isDetached--">isDetached</a></span>()</code> </td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#isMaster--">isMaster</a></span>()</code> </td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#isReplica--">isReplica</a></span>()</code> </td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#isUnknown--">isUnknown</a></span>()</code> </td>
|
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</tr>
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<tr id="i5" class="rowColor">
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<td class="colFirst"><code>static <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#valueOf-java.lang.String-">valueOf</a></span>(java.lang.String name)</code>
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<div class="block">Returns the enum constant of this type with the specified name.</div>
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</td>
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</tr>
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<tr id="i6" class="altColor">
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<td class="colFirst"><code>static <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a>[]</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html#values--">values</a></span>()</code>
|
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<div class="block">Returns an array containing the constants of this enum type, in
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the order they are declared.</div>
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</td>
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</table>
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Enum">
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<!-- -->
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</a>
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<h3>Methods inherited from class java.lang.Enum</h3>
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<code>clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf</code></li>
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</a>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>getClass, notify, notifyAll, wait, wait, wait</code></li>
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</ul>
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</ul>
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</li>
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</ul>
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</div>
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<div class="details">
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<ul class="blockList">
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<li class="blockList">
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<!-- ============ ENUM CONSTANT DETAIL =========== -->
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<li class="blockList"><a name="enum.constant.detail">
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<h3>Enum Constant Detail</h3>
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<a name="DETACHED">
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<!-- -->
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<ul class="blockList">
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<li class="blockList">
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<h4>DETACHED</h4>
|
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<pre>public static final <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a> DETACHED</pre>
|
||
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<div class="block">The node is not associated with the group. Its handle has been
|
||
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closed. No operations can be performed on the environment when it is
|
||
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in this state.</div>
|
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</li>
|
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</ul>
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<a name="UNKNOWN">
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<!-- -->
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</a>
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<ul class="blockList">
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<li class="blockList">
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<h4>UNKNOWN</h4>
|
||
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<pre>public static final <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a> UNKNOWN</pre>
|
||
|
<div class="block">The node is not currently in contact with the master, but is actively
|
||
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trying to establish contact with, or decide upon, a master. While in
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||
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this state the node is restricted to performing just read operations
|
||
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on its environment. In a functioning group, this state is
|
||
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transitory.</div>
|
||
|
</li>
|
||
|
</ul>
|
||
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<a name="MASTER">
|
||
|
<!-- -->
|
||
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</a>
|
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<ul class="blockList">
|
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<li class="blockList">
|
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<h4>MASTER</h4>
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||
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<pre>public static final <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a> MASTER</pre>
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||
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<div class="block">The node is the unique master of the group and can both read and
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||
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write to its environment. When the node transitions to the
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state, the application running on the node must make provisions to
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start processing application level write requests in addition to
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||
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read requests.</div>
|
||
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</li>
|
||
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</ul>
|
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<a name="REPLICA">
|
||
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<!-- -->
|
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</a>
|
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<ul class="blockListLast">
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<li class="blockList">
|
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<h4>REPLICA</h4>
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||
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<pre>public static final <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a> REPLICA</pre>
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||
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<div class="block">The node is a replica that is being updated by the master. It is
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||
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restricted to reading its environment. When the node
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||
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transitions to this state, the application running on the node must
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||
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make provisions to ensure that it does not write to the
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||
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environment. It must arrange for all write requests to be routed to
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the master.</div>
|
||
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</li>
|
||
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</ul>
|
||
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</li>
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</ul>
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<!-- ============ METHOD DETAIL ========== -->
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<li class="blockList"><a name="method.detail">
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<!-- -->
|
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</a>
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<h3>Method Detail</h3>
|
||
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<a name="values--">
|
||
|
<!-- -->
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</a>
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<h4>values</h4>
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<pre>public static <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a>[] values()</pre>
|
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<div class="block">Returns an array containing the constants of this enum type, in
|
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the order they are declared. This method may be used to iterate
|
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over the constants as follows:
|
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<pre>
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for (ReplicatedEnvironment.State c : ReplicatedEnvironment.State.values())
|
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System.out.println(c);
|
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</pre></div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>an array containing the constants of this enum type, in the order they are declared</dd>
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</dl>
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<a name="valueOf-java.lang.String-">
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<h4>valueOf</h4>
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<pre>public static <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep">ReplicatedEnvironment.State</a> valueOf(java.lang.String name)</pre>
|
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<div class="block">Returns the enum constant of this type with the specified name.
|
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The string must match <i>exactly</i> an identifier used to declare an
|
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enum constant in this type. (Extraneous whitespace characters are
|
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not permitted.)</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>name</code> - the name of the enum constant to be returned.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the enum constant with the specified name</dd>
|
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code>java.lang.IllegalArgumentException</code> - if this enum type has no constant with the specified name</dd>
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<dd><code>java.lang.NullPointerException</code> - if the argument is null</dd>
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</dl>
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</li>
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<a name="isMaster--">
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<h4>isMaster</h4>
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<pre>public final boolean isMaster()</pre>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>true if the node is a Master when in this state</dd>
|
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</dl>
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</li>
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</ul>
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<a name="isReplica--">
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<h4>isReplica</h4>
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<pre>public final boolean isReplica()</pre>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
|
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<dd>true if the node is a Replica when in this state</dd>
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</dl>
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</li>
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<h4>isDetached</h4>
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<pre>public final boolean isDetached()</pre>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
|
||
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<dd>true if the node is disconnected from the replication
|
||
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group when in this state.</dd>
|
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</dl>
|
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</li>
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</ul>
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<a name="isUnknown--">
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<h4>isUnknown</h4>
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<pre>public final boolean isUnknown()</pre>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
|
||
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<dd>true if the node's state is unknown, and it is attempting
|
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to transition to Master or Replica.</dd>
|
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</dl>
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</li>
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</ul>
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<a name="isActive--">
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<ul class="blockListLast">
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<li class="blockList">
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<h4>isActive</h4>
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<pre>public final boolean isActive()</pre>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
|
||
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<dd>true if the node is currently participating in the group as
|
||
|
a Replica or a Master</dd>
|
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</dl>
|
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</li>
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</ul>
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</li>
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</ul>
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