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 <div class="subTitle">org.apache.openejb.util</div>
 <h2 title="Class Pool" class="title">Class Pool&lt;T&gt;</h2>
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 <li>java.lang.Object</li>
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 <li>org.apache.openejb.util.Pool&lt;T&gt;</li>
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 <pre>public class <span class="typeNameLabel">Pool&lt;T&gt;</span>
 extends java.lang.Object</pre>
 <div class="block">Any successful pop() call requires a corresponding push() or discard() call.

  A pop() call that returns null is considered successful.  A null indicates
  that the calling code has a permit to create a poolable object and call
  <a href="../../../../org/apache/openejb/util/Pool.html#push-T-"><code>push(Object)</code></a>.  This is the only situation in which that method
  may be called.

  To simply fill the pool without a corresponding pop(), the add() method
  must be used.  This method will attempt to aquire a permit to add to the pool.</div>
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 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Class and Description</th>
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 <tr class="altColor">
 <td class="colFirst"><code>static class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.Builder.html" title="class in org.apache.openejb.util">Pool.Builder</a>&lt;<a href="../../../../org/apache/openejb/util/Pool.Builder.html" title="type parameter in Pool.Builder">T</a>&gt;</span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.Entry.html" title="class in org.apache.openejb.util">Pool.Entry</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.Event.html" title="enum in org.apache.openejb.util">Pool.Event</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.HardReference.html" title="class in org.apache.openejb.util">Pool.HardReference</a>&lt;<a href="../../../../org/apache/openejb/util/Pool.HardReference.html" title="type parameter in Pool.HardReference">T</a>&gt;</span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static interface&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.Supplier.html" title="interface in org.apache.openejb.util">Pool.Supplier</a>&lt;<a href="../../../../org/apache/openejb/util/Pool.Supplier.html" title="type parameter in Pool.Supplier">T</a>&gt;</span></code>&nbsp;</td>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#Pool-int-int-boolean-">Pool</a></span>(int&nbsp;max,
     int&nbsp;min,
     boolean&nbsp;strict)</code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#Pool-int-int-boolean-long-long-long-java.util.concurrent.Executor-org.apache.openejb.util.Pool.Supplier-boolean-double-boolean-boolean-">Pool</a></span>(int&nbsp;max,
     int&nbsp;min,
     boolean&nbsp;strict,
     long&nbsp;maxAge,
     long&nbsp;idleTimeout,
     long&nbsp;sweepInterval,
     java.util.concurrent.Executor&nbsp;executor,
     <a href="../../../../org/apache/openejb/util/Pool.Supplier.html" title="interface in org.apache.openejb.util">Pool.Supplier</a>&lt;<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&gt;&nbsp;supplier,
     boolean&nbsp;replaceAged,
     double&nbsp;maxAgeOffset,
     boolean&nbsp;garbageCollection,
     boolean&nbsp;replaceFlushed)</code>&nbsp;</td>
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 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#add-T-">add</a></span>(<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&nbsp;obj)</code>
 <div class="block">Attempt to aquire a permit to add the object to the pool.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#add-T-long-">add</a></span>(<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&nbsp;obj,
    long&nbsp;offset)</code>
 <div class="block">Attempt to aquire a permit to add the object to the pool.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#close-long-java.util.concurrent.TimeUnit-">close</a></span>(long&nbsp;timeout,
      java.util.concurrent.TimeUnit&nbsp;unit)</code>&nbsp;</td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#discard--">discard</a></span>()</code>
 <div class="block">Used when a call to pop() was made that returned null
  indicating that the caller has a permit to create an
  object for this pool, but the caller will not be exercising
  that permit and wishes intstead to return "null" to the pool.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#discard-org.apache.openejb.util.Pool.Entry-">discard</a></span>(<a href="../../../../org/apache/openejb/util/Pool.Entry.html" title="class in org.apache.openejb.util">Pool.Entry</a>&nbsp;entry)</code>&nbsp;</td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#flush--">flush</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code><a href="../../../../org/apache/openejb/util/Pool.Entry.html" title="class in org.apache.openejb.util">Pool.Entry</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#pop-long-java.util.concurrent.TimeUnit-">pop</a></span>(long&nbsp;timeout,
    java.util.concurrent.TimeUnit&nbsp;unit)</code>
 <div class="block">Any successful pop() call requires a corresponding push() or discard() call

  A pop() call that returns null is considered successful.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#push-org.apache.openejb.util.Pool.Entry-">push</a></span>(<a href="../../../../org/apache/openejb/util/Pool.Entry.html" title="class in org.apache.openejb.util">Pool.Entry</a>&nbsp;entry)</code>&nbsp;</td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#push-T-">push</a></span>(<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&nbsp;obj)</code>
 <div class="block">Never call this method without having successfully called
  <a href="../../../../org/apache/openejb/util/Pool.html#pop-long-java.util.concurrent.TimeUnit-"><code>pop(long, TimeUnit)</code></a> beforehand.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#running--">running</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code><a href="../../../../org/apache/openejb/util/Pool.html" title="class in org.apache.openejb.util">Pool</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#start--">start</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/util/Pool.html#stop--">stop</a></span>()</code>&nbsp;</td>
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 <h3>Methods inherited from class&nbsp;java.lang.Object</h3>
 <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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 <h4>Pool</h4>
 <pre>public&nbsp;Pool(int&nbsp;max,
             int&nbsp;min,
             boolean&nbsp;strict)</pre>
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 <h4>Pool</h4>
 <pre>public&nbsp;Pool(int&nbsp;max,
             int&nbsp;min,
             boolean&nbsp;strict,
             long&nbsp;maxAge,
             long&nbsp;idleTimeout,
             long&nbsp;sweepInterval,
             java.util.concurrent.Executor&nbsp;executor,
             <a href="../../../../org/apache/openejb/util/Pool.Supplier.html" title="interface in org.apache.openejb.util">Pool.Supplier</a>&lt;<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&gt;&nbsp;supplier,
             boolean&nbsp;replaceAged,
             double&nbsp;maxAgeOffset,
             boolean&nbsp;garbageCollection,
             boolean&nbsp;replaceFlushed)</pre>
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 <h4>start</h4>
 <pre>public&nbsp;<a href="../../../../org/apache/openejb/util/Pool.html" title="class in org.apache.openejb.util">Pool</a>&nbsp;start()</pre>
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 <pre>public&nbsp;boolean&nbsp;running()</pre>
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 <pre>public&nbsp;void&nbsp;flush()</pre>
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 <h4>pop</h4>
 <pre>public&nbsp;<a href="../../../../org/apache/openejb/util/Pool.Entry.html" title="class in org.apache.openejb.util">Pool.Entry</a>&nbsp;pop(long&nbsp;timeout,
                       java.util.concurrent.TimeUnit&nbsp;unit)
                throws java.lang.InterruptedException,
                       java.util.concurrent.TimeoutException</pre>
 <div class="block">Any successful pop() call requires a corresponding push() or discard() call

  A pop() call that returns null is considered successful.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>timeout</code> - time to block while waiting for an instance</dd>
 <dd><code>unit</code> - unit of time dicated by the timeout</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>an entry from the pool or null indicating permission to create and push() an instance into the pool</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.InterruptedException</code> - vm level thread interruption</dd>
 <dd><code>java.lang.IllegalStateException</code> - if a permit could not be acquired</dd>
 <dd><code>java.util.concurrent.TimeoutException</code> - if no instance could be obtained within the timeout</dd>
 </dl>
 </li>
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 <a name="add-java.lang.Object-">
 <!--   -->
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 <h4>add</h4>
 <pre>public&nbsp;boolean&nbsp;add(<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&nbsp;obj)</pre>
 <div class="block">Attempt to aquire a permit to add the object to the pool.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>obj</code> - object to add to the pool</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true of the item as added</dd>
 </dl>
 </li>
 </ul>
 <a name="add-java.lang.Object-long-">
 <!--   -->
 </a><a name="add-T-long-">
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 <h4>add</h4>
 <pre>public&nbsp;boolean&nbsp;add(<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&nbsp;obj,
                    long&nbsp;offset)</pre>
 <div class="block">Attempt to aquire a permit to add the object to the pool.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>obj</code> - object to add to the pool</dd>
 <dd><code>offset</code> - creation time offset, used for maxAge</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true of the item as added</dd>
 </dl>
 </li>
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 <a name="push-java.lang.Object-">
 <!--   -->
 </a><a name="push-T-">
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 <h4>push</h4>
 <pre>public&nbsp;boolean&nbsp;push(<a href="../../../../org/apache/openejb/util/Pool.html" title="type parameter in Pool">T</a>&nbsp;obj)</pre>
 <div class="block">Never call this method without having successfully called
  <a href="../../../../org/apache/openejb/util/Pool.html#pop-long-java.util.concurrent.TimeUnit-"><code>pop(long, TimeUnit)</code></a> beforehand.

  Failure to do so will increase the max pool size by one.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>obj</code> - object to push onto the pool</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>false if the pool max size was exceeded</dd>
 </dl>
 </li>
 </ul>
 <a name="push-org.apache.openejb.util.Pool.Entry-">
 <!--   -->
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 <ul class="blockList">
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 <h4>push</h4>
 <pre>public&nbsp;boolean&nbsp;push(<a href="../../../../org/apache/openejb/util/Pool.Entry.html" title="class in org.apache.openejb.util">Pool.Entry</a>&nbsp;entry)</pre>
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 <h4>discard</h4>
 <pre>public&nbsp;void&nbsp;discard()</pre>
 <div class="block">Used when a call to pop() was made that returned null
  indicating that the caller has a permit to create an
  object for this pool, but the caller will not be exercising
  that permit and wishes intstead to return "null" to the pool.</div>
 </li>
 </ul>
 <a name="discard-org.apache.openejb.util.Pool.Entry-">
 <!--   -->
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 <h4>discard</h4>
 <pre>public&nbsp;void&nbsp;discard(<a href="../../../../org/apache/openejb/util/Pool.Entry.html" title="class in org.apache.openejb.util">Pool.Entry</a>&nbsp;entry)</pre>
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 <h4>close</h4>
 <pre>public&nbsp;boolean&nbsp;close(long&nbsp;timeout,
                      java.util.concurrent.TimeUnit&nbsp;unit)
               throws java.lang.InterruptedException</pre>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.InterruptedException</code></dd>
 </dl>
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