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<div class="subTitle">org.apache.mina.filter.executor</div>
<h2 title="Class WriteRequestFilter" class="title">Class WriteRequestFilter</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html" title="class in org.apache.mina.core.filterchain">org.apache.mina.core.filterchain.IoFilterAdapter</a></li>
<li>
<ul class="inheritance">
<li>org.apache.mina.filter.executor.WriteRequestFilter</li>
</ul>
</li>
</ul>
</li>
</ul>
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/mina/core/filterchain/IoFilter.html" title="interface in org.apache.mina.core.filterchain">IoFilter</a></dd>
</dl>
<hr>
<br>
<pre>public class <a href="../../../../../src-html/org/apache/mina/filter/executor/WriteRequestFilter.html#line.63">WriteRequestFilter</a>
extends <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html" title="class in org.apache.mina.core.filterchain">IoFilterAdapter</a></pre>
<div class="block">Attaches an <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a> to an <a href="../../../../../org/apache/mina/core/session/IoSession.html" title="interface in org.apache.mina.core.session"><code>IoSession</code></a>'s
<a href="../../../../../org/apache/mina/core/write/WriteRequest.html" title="interface in org.apache.mina.core.write"><code>WriteRequest</code></a> queue to provide accurate write queue status tracking.
<p>
The biggest difference from <a href="../../../../../org/apache/mina/filter/executor/OrderedThreadPoolExecutor.html" title="class in org.apache.mina.filter.executor"><code>OrderedThreadPoolExecutor</code></a> and
<a href="../../../../../org/apache/mina/filter/executor/UnorderedThreadPoolExecutor.html" title="class in org.apache.mina.filter.executor"><code>UnorderedThreadPoolExecutor</code></a> is that <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html#polled(java.lang.Object, org.apache.mina.core.session.IoEvent)"><code>IoEventQueueHandler.polled(Object, IoEvent)</code></a>
is invoked when the write operation is completed by an <a href="../../../../../org/apache/mina/core/service/IoProcessor.html" title="interface in org.apache.mina.core.service"><code>IoProcessor</code></a>,
consequently providing the accurate tracking of the write request queue
status to the <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a>.
<p>
Most common usage of this filter could be detecting an <a href="../../../../../org/apache/mina/core/session/IoSession.html" title="interface in org.apache.mina.core.session"><code>IoSession</code></a>
which writes too fast which will cause <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/OutOfMemoryError.html?is-external=true" title="class or interface in java.lang"><code>OutOfMemoryError</code></a> soon:
<pre>
session.getFilterChain().addLast(
"writeThrottle",
new WriteRequestFilter(new IoEventQueueThrottle()));
</pre>
<h3>Known issues</h3>
You can run into a dead lock if you run this filter with the blocking
<a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a> implementation such as <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueThrottle.html" title="class in org.apache.mina.filter.executor"><code>IoEventQueueThrottle</code></a>
in the <a href="../../../../../org/apache/mina/core/service/IoProcessor.html" title="interface in org.apache.mina.core.service"><code>IoProcessor</code></a> thread. It's because an <a href="../../../../../org/apache/mina/core/service/IoProcessor.html" title="interface in org.apache.mina.core.service"><code>IoProcessor</code></a>
thread is what processes the <a href="../../../../../org/apache/mina/core/write/WriteRequest.html" title="interface in org.apache.mina.core.write"><code>WriteRequest</code></a>s and notifies related
<a href="../../../../../org/apache/mina/core/future/WriteFuture.html" title="interface in org.apache.mina.core.future"><code>WriteFuture</code></a>s; the <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a> implementation that
waits for the size of the write request queue to decrease will never wake
up. To use such an handler, you have to insert an <a href="../../../../../org/apache/mina/filter/executor/ExecutorFilter.html" title="class in org.apache.mina.filter.executor"><code>ExecutorFilter</code></a>
before this filter or call <a href="../../../../../org/apache/mina/core/session/IoSession.html#write(java.lang.Object)"><code>IoSession.write(Object)</code></a> method always
from a different thread.</div>
<dl><dt><span class="strong">Author:</span></dt>
<dd><a href="http://mina.apache.org">Apache MINA Project</a></dd></dl>
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.mina.core.filterchain.<a href="../../../../../org/apache/mina/core/filterchain/IoFilter.html" title="interface in org.apache.mina.core.filterchain">IoFilter</a></h3>
<code><a href="../../../../../org/apache/mina/core/filterchain/IoFilter.NextFilter.html" title="interface in org.apache.mina.core.filterchain">IoFilter.NextFilter</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/mina/filter/executor/WriteRequestFilter.html#WriteRequestFilter()">WriteRequestFilter</a></strong>()</code>
<div class="block">Creates a new instance with a new default <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueThrottle.html" title="class in org.apache.mina.filter.executor"><code>IoEventQueueThrottle</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/mina/filter/executor/WriteRequestFilter.html#WriteRequestFilter(org.apache.mina.filter.executor.IoEventQueueHandler)">WriteRequestFilter</a></strong>(<a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor">IoEventQueueHandler</a>&nbsp;queueHandler)</code>
<div class="block">Creates a new instance with the specified <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a>.</div>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/mina/filter/executor/WriteRequestFilter.html#filterWrite(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, org.apache.mina.core.write.WriteRequest)">filterWrite</a></strong>(<a href="../../../../../org/apache/mina/core/filterchain/IoFilter.NextFilter.html" title="interface in org.apache.mina.core.filterchain">IoFilter.NextFilter</a>&nbsp;nextFilter,
<a href="../../../../../org/apache/mina/core/session/IoSession.html" title="interface in org.apache.mina.core.session">IoSession</a>&nbsp;session,
<a href="../../../../../org/apache/mina/core/write/WriteRequest.html" title="interface in org.apache.mina.core.write">WriteRequest</a>&nbsp;writeRequest)</code>
<div class="block">Filters <a href="../../../../../org/apache/mina/core/session/IoSession.html#write(java.lang.Object)"><code>IoSession.write(Object)</code></a> method invocation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor">IoEventQueueHandler</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/mina/filter/executor/WriteRequestFilter.html#getQueueHandler()">getQueueHandler</a></strong>()</code>
<div class="block">Returns the <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a> which is attached to this
filter.</div>
</td>
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<h3>Methods inherited from class&nbsp;org.apache.mina.core.filterchain.<a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html" title="class in org.apache.mina.core.filterchain">IoFilterAdapter</a></h3>
<code><a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#destroy()">destroy</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#exceptionCaught(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, java.lang.Throwable)">exceptionCaught</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#filterClose(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession)">filterClose</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#init()">init</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#inputClosed(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession)">inputClosed</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#messageReceived(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, java.lang.Object)">messageReceived</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#messageSent(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, org.apache.mina.core.write.WriteRequest)">messageSent</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#onPostAdd(org.apache.mina.core.filterchain.IoFilterChain, java.lang.String, org.apache.mina.core.filterchain.IoFilter.NextFilter)">onPostAdd</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#onPostRemove(org.apache.mina.core.filterchain.IoFilterChain, java.lang.String, org.apache.mina.core.filterchain.IoFilter.NextFilter)">onPostRemove</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#onPreAdd(org.apache.mina.core.filterchain.IoFilterChain, java.lang.String, org.apache.mina.core.filterchain.IoFilter.NextFilter)">onPreAdd</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#onPreRemove(org.apache.mina.core.filterchain.IoFilterChain, java.lang.String, org.apache.mina.core.filterchain.IoFilter.NextFilter)">onPreRemove</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#sessionClosed(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession)">sessionClosed</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#sessionCreated(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession)">sessionCreated</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#sessionIdle(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, org.apache.mina.core.session.IdleStatus)">sessionIdle</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#sessionOpened(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession)">sessionOpened</a>, <a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#toString()">toString</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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/1.5.0/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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<h3>Constructor Detail</h3>
<a name="WriteRequestFilter()">
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<h4>WriteRequestFilter</h4>
<pre>public&nbsp;<a href="../../../../../src-html/org/apache/mina/filter/executor/WriteRequestFilter.html#line.70">WriteRequestFilter</a>()</pre>
<div class="block">Creates a new instance with a new default <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueThrottle.html" title="class in org.apache.mina.filter.executor"><code>IoEventQueueThrottle</code></a>.</div>
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<h4>WriteRequestFilter</h4>
<pre>public&nbsp;<a href="../../../../../src-html/org/apache/mina/filter/executor/WriteRequestFilter.html#line.77">WriteRequestFilter</a>(<a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor">IoEventQueueHandler</a>&nbsp;queueHandler)</pre>
<div class="block">Creates a new instance with the specified <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a>.</div>
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<h3>Method Detail</h3>
<a name="getQueueHandler()">
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<h4>getQueueHandler</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor">IoEventQueueHandler</a>&nbsp;<a href="../../../../../src-html/org/apache/mina/filter/executor/WriteRequestFilter.html#line.88">getQueueHandler</a>()</pre>
<div class="block">Returns the <a href="../../../../../org/apache/mina/filter/executor/IoEventQueueHandler.html" title="interface in org.apache.mina.filter.executor"><code>IoEventQueueHandler</code></a> which is attached to this
filter.</div>
</li>
</ul>
<a name="filterWrite(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, org.apache.mina.core.write.WriteRequest)">
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<h4>filterWrite</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/mina/filter/executor/WriteRequestFilter.html#line.93">filterWrite</a>(<a href="../../../../../org/apache/mina/core/filterchain/IoFilter.NextFilter.html" title="interface in org.apache.mina.core.filterchain">IoFilter.NextFilter</a>&nbsp;nextFilter,
<a href="../../../../../org/apache/mina/core/session/IoSession.html" title="interface in org.apache.mina.core.session">IoSession</a>&nbsp;session,
<a href="../../../../../org/apache/mina/core/write/WriteRequest.html" title="interface in org.apache.mina.core.write">WriteRequest</a>&nbsp;writeRequest)
throws <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#filterWrite(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, org.apache.mina.core.write.WriteRequest)">IoFilterAdapter</a></code></strong></div>
<div class="block">Filters <a href="../../../../../org/apache/mina/core/session/IoSession.html#write(java.lang.Object)"><code>IoSession.write(Object)</code></a> method invocation.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/mina/core/filterchain/IoFilter.html#filterWrite(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, org.apache.mina.core.write.WriteRequest)">filterWrite</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/mina/core/filterchain/IoFilter.html" title="interface in org.apache.mina.core.filterchain">IoFilter</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html#filterWrite(org.apache.mina.core.filterchain.IoFilter.NextFilter, org.apache.mina.core.session.IoSession, org.apache.mina.core.write.WriteRequest)">filterWrite</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/mina/core/filterchain/IoFilterAdapter.html" title="class in org.apache.mina.core.filterchain">IoFilterAdapter</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>nextFilter</code> - the <a href="../../../../../org/apache/mina/core/filterchain/IoFilter.NextFilter.html" title="interface in org.apache.mina.core.filterchain"><code>IoFilter.NextFilter</code></a> for this filter. You can reuse this
object until this filter is removed from the chain.</dd><dd><code>session</code> - The <a href="../../../../../org/apache/mina/core/session/IoSession.html" title="interface in org.apache.mina.core.session"><code>IoSession</code></a> which has to process this invocation</dd><dd><code>writeRequest</code> - The <a href="../../../../../org/apache/mina/core/write/WriteRequest.html" title="interface in org.apache.mina.core.write"><code>WriteRequest</code></a> to process</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd></dl>
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