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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.eclipse.jetty.util</a></div>
<h2 title="Class LeakDetector" class="title">Class LeakDetector&lt;T&gt;</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">org.eclipse.jetty.util.component.AbstractLifeCycle</a></li>
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<li>org.eclipse.jetty.util.LeakDetector&lt;T&gt;</li>
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<dd><code>java.lang.Runnable</code>, <code><a href="component/LifeCycle.html" title="interface in org.eclipse.jetty.util.component">LifeCycle</a></code></dd>
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<pre>public class <span class="typeNameLabel">LeakDetector&lt;T&gt;</span>
extends <a href="component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a>
implements java.lang.Runnable</pre>
<div class="block">A facility to detect improper usage of resource pools.
<p>
Resource pools usually have a method to acquire a pooled resource and a method to released it back to the pool.
<p>
To detect if client code acquires a resource but never releases it, the resource pool can be modified to use a
<a href="LeakDetector.html" title="class in org.eclipse.jetty.util"><code>LeakDetector</code></a>. The modified resource pool should call <a href="#acquired(T)"><code>acquired(Object)</code></a> every time the method to
acquire a resource is called, and <a href="#released(T)"><code>released(Object)</code></a> every time the method to release the resource is called.
<a href="LeakDetector.html" title="class in org.eclipse.jetty.util"><code>LeakDetector</code></a> keeps track of these resources and invokes method
<a href="#leaked(org.eclipse.jetty.util.LeakDetector.LeakInfo)"><code>leaked(org.eclipse.jetty.util.LeakDetector.LeakInfo)</code></a> when it detects that a resource has been leaked (that
is, acquired but never released).
<p>
To detect whether client code releases a resource without having acquired it, the resource pool can be modified to
check the return value of <a href="#released(T)"><code>released(Object)</code></a>: if false, it means that the resource was not acquired.
<p>
IMPLEMENTATION NOTES
<p>
This class relies on <code>System.identityHashCode(Object)</code> to create a unique id for each resource passed to
<a href="#acquired(T)"><code>acquired(Object)</code></a> and <a href="#released(T)"><code>released(Object)</code></a>. <code>System.identityHashCode(Object)</code> does not guarantee
that it will not generate the same number for different objects, but in practice the chance of collision is rare.
<p>
<a href="LeakDetector.html" title="class in org.eclipse.jetty.util"><code>LeakDetector</code></a> uses <code>PhantomReference</code>s to detect leaks. <code>PhantomReference</code>s are enqueued in their
<code>ReferenceQueue</code> <em>after</em> they have been garbage collected (differently from <code>WeakReference</code>s that
are enqueued <em>before</em>). Since the resource is now garbage collected, <a href="LeakDetector.html" title="class in org.eclipse.jetty.util"><code>LeakDetector</code></a> checks whether it
has been released and if not, it reports a leak. Using <code>PhantomReference</code>s is better than overriding
<code>Object.finalize()</code> and works also in those cases where <code>Object.finalize()</code> is not overridable.</div>
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<td class="colFirst"><code>class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="LeakDetector.LeakInfo.html" title="class in org.eclipse.jetty.util">LeakDetector.LeakInfo</a></span></code></th>
<td class="colLast">
<div class="block">Information about the leak of a resource.</div>
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<code><a href="component/AbstractLifeCycle.AbstractLifeCycleListener.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle.AbstractLifeCycleListener</a></code></li>
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<code><a href="component/LifeCycle.Listener.html" title="interface in org.eclipse.jetty.util.component">LifeCycle.Listener</a></code></li>
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<code><a href="component/AbstractLifeCycle.html#FAILED">FAILED</a>, <a href="component/AbstractLifeCycle.html#RUNNING">RUNNING</a>, <a href="component/AbstractLifeCycle.html#STARTED">STARTED</a>, <a href="component/AbstractLifeCycle.html#STARTING">STARTING</a>, <a href="component/AbstractLifeCycle.html#STOPPED">STOPPED</a>, <a href="component/AbstractLifeCycle.html#STOPPING">STOPPING</a></code></li>
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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">LeakDetector</a></span>()</code></th>
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<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#acquired(T)">acquired</a></span>&#8203;(<a href="LeakDetector.html" title="type parameter in LeakDetector">T</a>&nbsp;resource)</code></th>
<td class="colLast">
<div class="block">Tracks the resource as been acquired.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#doStart()">doStart</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#doStop()">doStop</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#id(T)">id</a></span>&#8203;(<a href="LeakDetector.html" title="type parameter in LeakDetector">T</a>&nbsp;resource)</code></th>
<td class="colLast">
<div class="block">Generates a unique ID for the given resource.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#leaked(org.eclipse.jetty.util.LeakDetector.LeakInfo)">leaked</a></span>&#8203;(<a href="LeakDetector.LeakInfo.html" title="class in org.eclipse.jetty.util">LeakDetector.LeakInfo</a>&nbsp;leakInfo)</code></th>
<td class="colLast">
<div class="block">Callback method invoked by <a href="LeakDetector.html" title="class in org.eclipse.jetty.util"><code>LeakDetector</code></a> when it detects that a resource has been leaked.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#released(T)">released</a></span>&#8203;(<a href="LeakDetector.html" title="type parameter in LeakDetector">T</a>&nbsp;resource)</code></th>
<td class="colLast">
<div class="block">Tracks the resource as been released.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#run()">run</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.eclipse.jetty.util.component.<a href="component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a></h3>
<code><a href="component/AbstractLifeCycle.html#addLifeCycleListener(org.eclipse.jetty.util.component.LifeCycle.Listener)">addLifeCycleListener</a>, <a href="component/AbstractLifeCycle.html#getState()">getState</a>, <a href="component/AbstractLifeCycle.html#getState(org.eclipse.jetty.util.component.LifeCycle)">getState</a>, <a href="component/AbstractLifeCycle.html#getStopTimeout()">getStopTimeout</a>, <a href="component/AbstractLifeCycle.html#isFailed()">isFailed</a>, <a href="component/AbstractLifeCycle.html#isRunning()">isRunning</a>, <a href="component/AbstractLifeCycle.html#isStarted()">isStarted</a>, <a href="component/AbstractLifeCycle.html#isStarting()">isStarting</a>, <a href="component/AbstractLifeCycle.html#isStopped()">isStopped</a>, <a href="component/AbstractLifeCycle.html#isStopping()">isStopping</a>, <a href="component/AbstractLifeCycle.html#removeLifeCycleListener(org.eclipse.jetty.util.component.LifeCycle.Listener)">removeLifeCycleListener</a>, <a href="component/AbstractLifeCycle.html#setStopTimeout(long)">setStopTimeout</a>, <a href="component/AbstractLifeCycle.html#start()">start</a>, <a href="component/AbstractLifeCycle.html#stop()">stop</a>, <a href="component/AbstractLifeCycle.html#toString()">toString</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>LeakDetector</h4>
<pre>public&nbsp;LeakDetector()</pre>
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<h4>acquired</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;acquired&#8203;(<a href="LeakDetector.html" title="type parameter in LeakDetector">T</a>&nbsp;resource)</pre>
<div class="block">Tracks the resource as been acquired.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>resource</code> - the resource that has been acquired</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true whether the resource has been acquired normally, false if the resource has detected a leak (meaning
that another acquire occurred before a release of the same resource)</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="#released(T)"><code>released(Object)</code></a></dd>
</dl>
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<a id="released(java.lang.Object)">
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<h4>released</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;released&#8203;(<a href="LeakDetector.html" title="type parameter in LeakDetector">T</a>&nbsp;resource)</pre>
<div class="block">Tracks the resource as been released.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>resource</code> - the resource that has been released</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true whether the resource has been released normally (based on a previous acquire). false if the resource
has been released without a prior acquire (such as a double release scenario)</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="#acquired(T)"><code>acquired(Object)</code></a></dd>
</dl>
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<h4>id</h4>
<pre class="methodSignature">public&nbsp;java.lang.String&nbsp;id&#8203;(<a href="LeakDetector.html" title="type parameter in LeakDetector">T</a>&nbsp;resource)</pre>
<div class="block">Generates a unique ID for the given resource.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>resource</code> - the resource to generate the unique ID for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the unique ID of the given resource</dd>
</dl>
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<h4>doStart</h4>
<pre class="methodSignature">protected&nbsp;void&nbsp;doStart()
throws java.lang.Exception</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="component/AbstractLifeCycle.html#doStart()">doStart</a></code>&nbsp;in class&nbsp;<code><a href="component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.Exception</code></dd>
</dl>
</li>
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<h4>doStop</h4>
<pre class="methodSignature">protected&nbsp;void&nbsp;doStop()
throws java.lang.Exception</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="component/AbstractLifeCycle.html#doStop()">doStop</a></code>&nbsp;in class&nbsp;<code><a href="component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.Exception</code></dd>
</dl>
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<h4>run</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;run()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>run</code>&nbsp;in interface&nbsp;<code>java.lang.Runnable</code></dd>
</dl>
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<h4>leaked</h4>
<pre class="methodSignature">protected&nbsp;void&nbsp;leaked&#8203;(<a href="LeakDetector.LeakInfo.html" title="class in org.eclipse.jetty.util">LeakDetector.LeakInfo</a>&nbsp;leakInfo)</pre>
<div class="block">Callback method invoked by <a href="LeakDetector.html" title="class in org.eclipse.jetty.util"><code>LeakDetector</code></a> when it detects that a resource has been leaked.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>leakInfo</code> - the information about the leak</dd>
</dl>
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