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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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<li>Field | </li>
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<!-- ======== START OF CLASS DATA ======== -->
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<div class="header">
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<div class="subTitle">com.sleepycat.persist.model</div>
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<h2 title="Class ClassEnhancer" class="title">Class ClassEnhancer</h2>
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</div>
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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>com.sleepycat.persist.model.ClassEnhancer</li>
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<dl>
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<dt>All Implemented Interfaces:</dt>
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<dd>java.lang.instrument.ClassFileTransformer</dd>
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</dl>
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<hr>
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<br>
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<pre>public class <span class="typeNameLabel">ClassEnhancer</span>
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extends java.lang.Object
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implements java.lang.instrument.ClassFileTransformer</pre>
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<div class="block">Enhances the bytecode of persistent classes to provide efficient access to
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fields and constructors, and to avoid special security policy settings for
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accessing non-public members. Classes are enhanced if they are annotated
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with <a href="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><code>Entity</code></a> or <a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a>.
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<p><code>ClassEnhancer</code> objects are thread-safe. Multiple threads may
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safely call the methods of a shared <code>ClassEnhancer</code> object.</p>
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<p>As described in the <a
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href="../package-summary.html#bytecode">package summary</a>, bytecode
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enhancement may be used either at runtime or offline (at build time).</p>
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<p>To use enhancement offline, this class may be used as a <a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#main-java.lang.String:A-"><code>main
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program</code></a>.
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<!-- begin JE only -->
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It may also be used via an <a href="../../../../com/sleepycat/persist/model/ClassEnhancerTask.html" title="class in com.sleepycat.persist.model"><code>ant task</code></a>.
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<!-- end JE only -->
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</p>
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<p>For enhancement at runtime, this class provides the low level support
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needed to transform class bytes during class loading. To configure runtime
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enhancement you may use one of the following approaches:</p>
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<ol>
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<li>The BDB <code>je-<version>.jar</code> or <code>db.jar</code> file may be used as
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an instrumentation agent as follows:
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<pre class="code">java -javaagent:<BDB-JAR-FILE>=enhance:packageNames ...</pre>
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<code>packageNames</code> is a comma separated list of packages containing
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persistent classes. Sub-packages of these packages are also searched. If
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<code>packageNames</code> is omitted then all packages known to the current
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classloader are searched.
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<p>The "-v" option may be included in the comma separated list to print the
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name of each class that is enhanced.</p></li>
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<li>The <a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#enhance-java.lang.String-byte:A-"><code>enhance(java.lang.String, byte[])</code></a> method may be called to implement a class loader
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that performs enhancement. Using this approach, it is the developer's
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responsibility to implement and configure the class loader.</li>
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</ol></div>
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<dl>
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<dt><span class="simpleTagLabel">Author:</span></dt>
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<dd>Mark Hayes</dd>
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</dl>
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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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<li class="blockList">
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.summary">
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<!-- -->
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</a>
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<h3>Constructor Summary</h3>
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<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colOne" scope="col">Constructor 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/persist/model/ClassEnhancer.html#ClassEnhancer--">ClassEnhancer</a></span>()</code>
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<div class="block">Creates a class enhancer that searches all packages.</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/persist/model/ClassEnhancer.html#ClassEnhancer-java.util.Set-">ClassEnhancer</a></span>(java.util.Set<java.lang.String> packageNames)</code>
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<div class="block">Creates a class enhancer that searches a given set of packages.</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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<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>byte[]</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#enhance-java.lang.String-byte:A-">enhance</a></span>(java.lang.String className,
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byte[] classBytes)</code>
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<div class="block">Enhances the given class bytes if the class is annotated with <a href="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><code>Entity</code></a> or <a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a>.</div>
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</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/persist/model/ClassEnhancer.html#getVerbose--">getVerbose</a></span>()</code>
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<div class="block">Gets verbose mode.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#main-java.lang.String:A-">main</a></span>(java.lang.String[] args)</code>
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<div class="block">Enhances classes in the directories specified.</div>
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</td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#premain-java.lang.String-java.lang.instrument.Instrumentation-">premain</a></span>(java.lang.String args,
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java.lang.instrument.Instrumentation inst)</code>
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<div class="block">Enhances classes as specified by a JVM -javaagent argument.</div>
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</td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#setVerbose-boolean-">setVerbose</a></span>(boolean verbose)</code>
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<div class="block">Sets verbose mode.</div>
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</td>
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</tr>
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<tr id="i5" class="rowColor">
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<td class="colFirst"><code>byte[]</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#transform-java.lang.ClassLoader-java.lang.String-java.lang.Class-java.security.ProtectionDomain-byte:A-">transform</a></span>(java.lang.ClassLoader loader,
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java.lang.String className,
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java.lang.Class<?> classBeingRedefined,
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java.security.ProtectionDomain protectionDomain,
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byte[] classfileBuffer)</code> </td>
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</table>
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<ul class="blockList">
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</a>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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</ul>
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</ul>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<li class="blockList"><a name="constructor.detail">
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</a>
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<h3>Constructor Detail</h3>
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<a name="ClassEnhancer--">
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</a>
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<h4>ClassEnhancer</h4>
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<pre>public ClassEnhancer()</pre>
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<div class="block">Creates a class enhancer that searches all packages.</div>
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</li>
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</ul>
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<a name="ClassEnhancer-java.util.Set-">
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</a>
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<ul class="blockListLast">
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<h4>ClassEnhancer</h4>
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<pre>public ClassEnhancer(java.util.Set<java.lang.String> packageNames)</pre>
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<div class="block">Creates a class enhancer that searches a given set of packages.</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>packageNames</code> - a set of packages to search for persistent
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classes. Sub-packages of these packages are also searched. If empty or
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null, all packages known to the current classloader are searched.</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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<!-- ============ METHOD DETAIL ========== -->
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<h3>Method Detail</h3>
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<a name="main-java.lang.String:A-">
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<h4>main</h4>
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<pre>public static void main(java.lang.String[] args)
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throws java.lang.Exception</pre>
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<div class="block">Enhances classes in the directories specified. The class files are
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replaced when they are enhanced, without changing the file modification
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date. For example:
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<pre class="code">java -cp je-<version>.jar com.sleepycat.persist.model.ClassEnhancer ./classes</pre>
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<p>The "-v" argument may be specified to print the name of each class
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file that is enhanced. The total number of class files enhanced will
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always be printed.</p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>args</code> - one or more directories containing classes to be enhanced.
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Subdirectories of these directories will also be searched. Optionally,
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-v may be included to print the name of every class file enhanced.</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code>java.lang.Exception</code> - if a problem occurs.</dd>
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</dl>
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<h4>premain</h4>
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<pre>public static void premain(java.lang.String args,
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java.lang.instrument.Instrumentation inst)</pre>
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<div class="block">Enhances classes as specified by a JVM -javaagent argument.</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>args</code> - see java.lang.instrument.Instrumentation.</dd>
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<dd><code>inst</code> - see java.lang.instrument.Instrumentation.</dd>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><code>Instrumentation</code></dd>
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</dl>
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</li>
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</ul>
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<h4>setVerbose</h4>
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<pre>public void setVerbose(boolean verbose)</pre>
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<div class="block">Sets verbose mode.
|
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<p>True may be specified to print the name of each class file that is
|
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enhanced. This property is false by default.</p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
|
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<dd><code>verbose</code> - whether to use verbose mode.</dd>
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</dl>
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</ul>
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<a name="getVerbose--">
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<h4>getVerbose</h4>
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<pre>public boolean getVerbose()</pre>
|
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|
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<div class="block">Gets verbose mode.</div>
|
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|
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<dl>
|
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<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
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<dd>whether to use verbose mode.</dd>
|
||
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<dt><span class="seeLabel">See Also:</span></dt>
|
||
|
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<dd><a href="../../../../com/sleepycat/persist/model/ClassEnhancer.html#setVerbose-boolean-"><code>setVerbose(boolean)</code></a></dd>
|
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</dl>
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</li>
|
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</ul>
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<a name="transform-java.lang.ClassLoader-java.lang.String-java.lang.Class-java.security.ProtectionDomain-byte:A-">
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<h4>transform</h4>
|
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<pre>public byte[] transform(java.lang.ClassLoader loader,
|
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java.lang.String className,
|
||
|
|
java.lang.Class<?> classBeingRedefined,
|
||
|
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java.security.ProtectionDomain protectionDomain,
|
||
|
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byte[] classfileBuffer)</pre>
|
||
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<dl>
|
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
|
||
|
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<dd><code>transform</code> in interface <code>java.lang.instrument.ClassFileTransformer</code></dd>
|
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|
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</dl>
|
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</li>
|
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</ul>
|
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<a name="enhance-java.lang.String-byte:A-">
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<h4>enhance</h4>
|
||
|
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<pre>public byte[] enhance(java.lang.String className,
|
||
|
|
byte[] classBytes)</pre>
|
||
|
|
<div class="block">Enhances the given class bytes if the class is annotated with <a href="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><code>Entity</code></a> or <a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a>.</div>
|
||
|
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<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>className</code> - the class name in binary format; for example,
|
||
|
|
"my.package.MyClass$Name", or null if no filtering by class name
|
||
|
|
should be performed.</dd>
|
||
|
|
<dd><code>classBytes</code> - are the class file bytes to be enhanced.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the enhanced bytes, or null if no enhancement was performed.</dd>
|
||
|
|
</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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</li>
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</ul>
|
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</div>
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</div>
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