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| <div class="subTitle">org.apache.mina.core.buffer</div> |
| <h2 title="Class CachedBufferAllocator" class="title">Class CachedBufferAllocator</h2> |
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| <ul class="inheritance"> |
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| <li> |
| <ul class="inheritance"> |
| <li>org.apache.mina.core.buffer.CachedBufferAllocator</li> |
| </ul> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer">IoBufferAllocator</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public class <span class="typeNameLabel">CachedBufferAllocator</span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer">IoBufferAllocator</a></pre> |
| <div class="block">An <a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer"><code>IoBufferAllocator</code></a> that caches the buffers which are likely to |
| be reused during auto-expansion of the buffers. |
| <p> |
| In <a href="../../../../../org/apache/mina/core/buffer/SimpleBufferAllocator.html" title="class in org.apache.mina.core.buffer"><code>SimpleBufferAllocator</code></a>, the underlying <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> of |
| the <a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer"><code>IoBuffer</code></a> is reallocated on its capacity change, which means |
| the newly allocated bigger <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> replaces the old small |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a>. Consequently, the old <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> is marked |
| for garbage collection. |
| <p> |
| It's not a problem in most cases as long as the capacity change doesn't |
| happen frequently. However, once it happens too often, it burdens the |
| VM and the cost of filling the newly allocated <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> with |
| <code>NUL</code> surpass the cost of accessing the cache. In 2 dual-core |
| Opteron Italy 270 processors, <a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html" title="class in org.apache.mina.core.buffer"><code>CachedBufferAllocator</code></a> outperformed |
| <a href="../../../../../org/apache/mina/core/buffer/SimpleBufferAllocator.html" title="class in org.apache.mina.core.buffer"><code>SimpleBufferAllocator</code></a> in the following situation: |
| <ul> |
| <li>when a 32 bytes buffer is expanded 4 or more times,</li> |
| <li>when a 64 bytes buffer is expanded 4 or more times,</li> |
| <li>when a 128 bytes buffer is expanded 2 or more times,</li> |
| <li>and when a 256 bytes or bigger buffer is expanded 1 or more times.</li> |
| </ul> |
| Please note the observation above is subject to change in a different |
| environment. |
| <p> |
| <a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html" title="class in org.apache.mina.core.buffer"><code>CachedBufferAllocator</code></a> uses <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/ThreadLocal.html?is-external=true" title="class or interface in java.lang"><code>ThreadLocal</code></a> to store the cached |
| buffer, allocates buffers whose capacity is power of 2 only and provides |
| performance advantage if <a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html#free--"><code>IoBuffer.free()</code></a> is called properly.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd><a href="http://mina.apache.org">Apache MINA Project</a></dd> |
| </dl> |
| </li> |
| </ul> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#CachedBufferAllocator--">CachedBufferAllocator</a></span>()</code> |
| <div class="block">Creates a new instance with the default parameters |
| (#DEFAULT_MAX_POOL_SIZE and #DEFAULT_MAX_CACHED_BUFFER_SIZE).</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#CachedBufferAllocator-int-int-">CachedBufferAllocator</a></span>(int maxPoolSize, |
| int maxCachedBufferSize)</code> |
| <div class="block">Creates a new instance.</div> |
| </td> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#allocate-int-boolean-">allocate</a></span>(int requestedCapacity, |
| boolean direct)</code> |
| <div class="block">Returns the buffer which is capable of the specified size.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#allocateNioBuffer-int-boolean-">allocateNioBuffer</a></span>(int capacity, |
| boolean direct)</code> |
| <div class="block">Returns the NIO buffer which is capable of the specified size.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#dispose--">dispose</a></span>()</code> |
| <div class="block">Dispose of this allocator.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#getMaxCachedBufferSize--">getMaxCachedBufferSize</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#getMaxPoolSize--">getMaxPoolSize</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#wrap-java.nio.ByteBuffer-">wrap</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> nioBuffer)</code> |
| <div class="block">Wraps the specified NIO <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> into MINA buffer.</div> |
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| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <h4>CachedBufferAllocator</h4> |
| <pre>public CachedBufferAllocator()</pre> |
| <div class="block">Creates a new instance with the default parameters |
| (#DEFAULT_MAX_POOL_SIZE and #DEFAULT_MAX_CACHED_BUFFER_SIZE).</div> |
| </li> |
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| <h4>CachedBufferAllocator</h4> |
| <pre>public CachedBufferAllocator(int maxPoolSize, |
| int maxCachedBufferSize)</pre> |
| <div class="block">Creates a new instance.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>maxPoolSize</code> - the maximum number of buffers with the same capacity per thread. |
| <tt>0</tt> disables this limitation.</dd> |
| <dd><code>maxCachedBufferSize</code> - the maximum capacity of a cached buffer. |
| A buffer whose capacity is bigger than this value is |
| not pooled. <tt>0</tt> disables this limitation.</dd> |
| </dl> |
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| <h4>getMaxPoolSize</h4> |
| <pre>public int getMaxPoolSize()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the maximum number of buffers with the same capacity per thread. |
| <tt>0</tt> means 'no limitation'.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getMaxCachedBufferSize</h4> |
| <pre>public int getMaxCachedBufferSize()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the maximum capacity of a cached buffer. A buffer whose |
| capacity is bigger than this value is not pooled. <tt>0</tt> means |
| 'no limitation'.</dd> |
| </dl> |
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| <h4>allocate</h4> |
| <pre>public <a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</a> allocate(int requestedCapacity, |
| boolean direct)</pre> |
| <div class="block">Returns the buffer which is capable of the specified size.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html#allocate-int-boolean-">allocate</a></code> in interface <code><a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer">IoBufferAllocator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>requestedCapacity</code> - the capacity of the buffer</dd> |
| <dd><code>direct</code> - <tt>true</tt> to get a direct buffer, |
| <tt>false</tt> to get a heap buffer.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The allocated <a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer"><code>IoBuffer</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>allocateNioBuffer</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> allocateNioBuffer(int capacity, |
| boolean direct)</pre> |
| <div class="block">Returns the NIO buffer which is capable of the specified size.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html#allocateNioBuffer-int-boolean-">allocateNioBuffer</a></code> in interface <code><a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer">IoBufferAllocator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>capacity</code> - the capacity of the buffer</dd> |
| <dd><code>direct</code> - <tt>true</tt> to get a direct buffer, |
| <tt>false</tt> to get a heap buffer.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The allocated <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>wrap</h4> |
| <pre>public <a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</a> wrap(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> nioBuffer)</pre> |
| <div class="block">Wraps the specified NIO <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> into MINA buffer.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html#wrap-java.nio.ByteBuffer-">wrap</a></code> in interface <code><a href="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer">IoBufferAllocator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nioBuffer</code> - The <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> to wrap</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The <a href="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer"><code>IoBuffer</code></a> wrapping the <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a></dd> |
| </dl> |
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| <h4>dispose</h4> |
| <pre>public void dispose()</pre> |
| <div class="block">Dispose of this allocator.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
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