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| org.apache.mina.core.buffer</FONT> |
| <BR> |
| Class CachedBufferAllocator</H2> |
| <PRE> |
| <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
| <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.mina.core.buffer.CachedBufferAllocator</B> |
| </PRE> |
| <DL> |
| <DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer">IoBufferAllocator</A></DD> |
| </DL> |
| <HR> |
| <DL> |
| <DT><PRE>public class <B>CachedBufferAllocator</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html" title="interface in org.apache.mina.core.buffer">IoBufferAllocator</A></DL> |
| </PRE> |
| |
| <P> |
| 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://java.sun.com/j2se/1.5.0/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://java.sun.com/j2se/1.5.0/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://java.sun.com/j2se/1.5.0/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://java.sun.com/j2se/1.5.0/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://java.sun.com/j2se/1.5.0/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://java.sun.com/j2se/1.5.0/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. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Author:</B></DT> |
| <DD><a href="http://mina.apache.org">Apache MINA Project</a></DD> |
| </DL> |
| <HR> |
| |
| <P> |
| |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| |
| <A NAME="constructor_summary"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
| <B>Constructor Summary</B></FONT></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#CachedBufferAllocator()">CachedBufferAllocator</A></B>()</CODE> |
| |
| <BR> |
| Creates a new instance with the default parameters |
| (#DEFAULT_MAX_POOL_SIZE and #DEFAULT_MAX_CACHED_BUFFER_SIZE).</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#CachedBufferAllocator(int, int)">CachedBufferAllocator</A></B>(int maxPoolSize, |
| int maxCachedBufferSize)</CODE> |
| |
| <BR> |
| Creates a new instance.</TD> |
| </TR> |
| </TABLE> |
| |
| <!-- ========== METHOD SUMMARY =========== --> |
| |
| <A NAME="method_summary"><!-- --></A> |
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| <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
| <B>Method Summary</B></FONT></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#allocate(int, boolean)">allocate</A></B>(int requestedCapacity, |
| boolean direct)</CODE> |
| |
| <BR> |
| Returns the buffer which is capable of the specified size.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#allocateNioBuffer(int, boolean)">allocateNioBuffer</A></B>(int capacity, |
| boolean direct)</CODE> |
| |
| <BR> |
| Returns the NIO buffer which is capable of the specified size.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#dispose()">dispose</A></B>()</CODE> |
| |
| <BR> |
| Dispose of this allocator.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> int</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#getMaxCachedBufferSize()">getMaxCachedBufferSize</A></B>()</CODE> |
| |
| <BR> |
| Returns the maximum capacity of a cached buffer.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> int</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#getMaxPoolSize()">getMaxPoolSize</A></B>()</CODE> |
| |
| <BR> |
| Returns the maximum number of buffers with the same capacity per thread.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../org/apache/mina/core/buffer/CachedBufferAllocator.html#wrap(java.nio.ByteBuffer)">wrap</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</A> nioBuffer)</CODE> |
| |
| <BR> |
| Wraps the specified NIO <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><CODE>ByteBuffer</CODE></A> into MINA buffer.</TD> |
| </TR> |
| </TABLE> |
| <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> |
| <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><A HREF="http://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/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://java.sun.com/j2se/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://java.sun.com/j2se/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></TD> |
| </TR> |
| </TABLE> |
| |
| <P> |
| |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| |
| <A NAME="constructor_detail"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
| <B>Constructor Detail</B></FONT></TH> |
| </TR> |
| </TABLE> |
| |
| <A NAME="CachedBufferAllocator()"><!-- --></A><H3> |
| CachedBufferAllocator</H3> |
| <PRE> |
| public <B>CachedBufferAllocator</B>()</PRE> |
| <DL> |
| <DD>Creates a new instance with the default parameters |
| (#DEFAULT_MAX_POOL_SIZE and #DEFAULT_MAX_CACHED_BUFFER_SIZE). |
| <P> |
| </DL> |
| <HR> |
| |
| <A NAME="CachedBufferAllocator(int, int)"><!-- --></A><H3> |
| CachedBufferAllocator</H3> |
| <PRE> |
| public <B>CachedBufferAllocator</B>(int maxPoolSize, |
| int maxCachedBufferSize)</PRE> |
| <DL> |
| <DD>Creates a new instance. |
| <P> |
| <DL> |
| <DT><B>Parameters:</B><DD><CODE>maxPoolSize</CODE> - the maximum number of buffers with the same capacity per thread. |
| <tt>0</tt> disables this limitation.<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.</DL> |
| </DL> |
| |
| <!-- ============ METHOD DETAIL ========== --> |
| |
| <A NAME="method_detail"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
| <B>Method Detail</B></FONT></TH> |
| </TR> |
| </TABLE> |
| |
| <A NAME="getMaxPoolSize()"><!-- --></A><H3> |
| getMaxPoolSize</H3> |
| <PRE> |
| public int <B>getMaxPoolSize</B>()</PRE> |
| <DL> |
| <DD>Returns the maximum number of buffers with the same capacity per thread. |
| <tt>0</tt> means 'no limitation'. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getMaxCachedBufferSize()"><!-- --></A><H3> |
| getMaxCachedBufferSize</H3> |
| <PRE> |
| public int <B>getMaxCachedBufferSize</B>()</PRE> |
| <DL> |
| <DD>Returns 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'. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="allocate(int, boolean)"><!-- --></A><H3> |
| allocate</H3> |
| <PRE> |
| public <A HREF="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</A> <B>allocate</B>(int requestedCapacity, |
| boolean direct)</PRE> |
| <DL> |
| <DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html#allocate(int, boolean)">IoBufferAllocator</A></CODE></B></DD> |
| <DD>Returns the buffer which is capable of the specified size. |
| <P> |
| <DD><DL> |
| <DT><B>Specified by:</B><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></DL> |
| </DD> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>requestedCapacity</CODE> - the capacity of the buffer<DD><CODE>direct</CODE> - <tt>true</tt> to get a direct buffer, |
| <tt>false</tt> to get a heap buffer.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="allocateNioBuffer(int, boolean)"><!-- --></A><H3> |
| allocateNioBuffer</H3> |
| <PRE> |
| public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</A> <B>allocateNioBuffer</B>(int capacity, |
| boolean direct)</PRE> |
| <DL> |
| <DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html#allocateNioBuffer(int, boolean)">IoBufferAllocator</A></CODE></B></DD> |
| <DD>Returns the NIO buffer which is capable of the specified size. |
| <P> |
| <DD><DL> |
| <DT><B>Specified by:</B><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></DL> |
| </DD> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>capacity</CODE> - the capacity of the buffer<DD><CODE>direct</CODE> - <tt>true</tt> to get a direct buffer, |
| <tt>false</tt> to get a heap buffer.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="wrap(java.nio.ByteBuffer)"><!-- --></A><H3> |
| wrap</H3> |
| <PRE> |
| public <A HREF="../../../../../org/apache/mina/core/buffer/IoBuffer.html" title="class in org.apache.mina.core.buffer">IoBuffer</A> <B>wrap</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</A> nioBuffer)</PRE> |
| <DL> |
| <DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html#wrap(java.nio.ByteBuffer)">IoBufferAllocator</A></CODE></B></DD> |
| <DD>Wraps the specified NIO <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><CODE>ByteBuffer</CODE></A> into MINA buffer. |
| <P> |
| <DD><DL> |
| <DT><B>Specified by:</B><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></DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="dispose()"><!-- --></A><H3> |
| dispose</H3> |
| <PRE> |
| public void <B>dispose</B>()</PRE> |
| <DL> |
| <DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/mina/core/buffer/IoBufferAllocator.html#dispose()">IoBufferAllocator</A></CODE></B></DD> |
| <DD>Dispose of this allocator. |
| <P> |
| <DD><DL> |
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