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| <div class="subTitle">org.apache.river.mercury</div> | |
| <h2 title="Class StreamPool" class="title">Class StreamPool</h2> | |
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| <li>org.apache.river.mercury.StreamPool</li> | |
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| <pre>class <span class="typeNameLabel">StreamPool</span> | |
| extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> | |
| <div class="block">This class provides a pool of <tt>LogStream</tt> objects. Each | |
| <tt>LogStream</tt> has an associated <tt>FileDescriptor</tt>, which | |
| is the system resource we are trying to manage. This pool limits the | |
| (user configurable) number of concurrent, open <tt>FileDescriptor</tt>s.</div> | |
| <dl> | |
| <dt><span class="simpleTagLabel">Since:</span></dt> | |
| <dd>1.1</dd> | |
| <dt><span class="simpleTagLabel">Author:</span></dt> | |
| <dd>Sun Microsystems, Inc.</dd> | |
| </dl> | |
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| </ul> | |
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| <h3>Field Summary</h3> | |
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| <caption><span>Fields</span><span class="tabEnd"> </span></caption> | |
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| <th class="colFirst" scope="col">Modifier and Type</th> | |
| <th class="colLast" scope="col">Field and Description</th> | |
| </tr> | |
| <tr class="altColor"> | |
| <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/docs/api/java/util/LinkedList.html?is-external=true" title="class or interface in java.util">LinkedList</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#freeList">freeList</a></span></code> | |
| <div class="block">Holds stream references in least recently used (released) order.</div> | |
| </td> | |
| </tr> | |
| <tr class="rowColor"> | |
| <td class="colFirst"><code>private int</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#maxPoolSize">maxPoolSize</a></span></code> | |
| <div class="block">Maximum limit for the number of concurrent <tt>LogStream</tt>s | |
| in the stream pool.</div> | |
| </td> | |
| </tr> | |
| <tr class="altColor"> | |
| <td class="colFirst"><code>private static <a href="http://docs.oracle.com/javase/6/docs/api/java/util/logging/Logger.html?is-external=true" title="class or interface in java.util.logging">Logger</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#persistenceLogger">persistenceLogger</a></span></code> | |
| <div class="block">Logger for lease related messages</div> | |
| </td> | |
| </tr> | |
| <tr class="rowColor"> | |
| <td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#pool">pool</a></span></code> | |
| <div class="block">Holds stream references by associated key</div> | |
| </td> | |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#StreamPool-int-">StreamPool</a></span>(int size)</code> | |
| <div class="block">Simple constructor that creates a pool of given <code>size</code>.</div> | |
| </td> | |
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| </table> | |
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| <th class="colFirst" scope="col">Modifier and Type</th> | |
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| <td class="colFirst"><code>(package private) void</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#dump--">dump</a></span>()</code> </td> | |
| </tr> | |
| <tr id="i1" class="rowColor"> | |
| <td class="colFirst"><code>private void</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#ensurePoolSpace--">ensurePoolSpace</a></span>()</code> | |
| <div class="block">Ensures that room is available in the pool.</div> | |
| </td> | |
| </tr> | |
| <tr id="i2" class="altColor"> | |
| <td class="colFirst"><code>(package private) <a href="../../../../org/apache/river/mercury/ControlLog.html" title="class in org.apache.river.mercury">ControlLog</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#getControlLog-java.io.File-">getControlLog</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> file)</code> | |
| <div class="block">Returns a <tt>ControlLog</tt> object for the specified <tt>file</tt> | |
| from the pool if it already exists.</div> | |
| </td> | |
| </tr> | |
| <tr id="i3" class="rowColor"> | |
| <td class="colFirst"><code>(package private) int</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#getFreeSize--">getFreeSize</a></span>()</code> </td> | |
| </tr> | |
| <tr id="i4" class="altColor"> | |
| <td class="colFirst"><code>(package private) <a href="../../../../org/apache/river/mercury/LogInputStream.html" title="class in org.apache.river.mercury">LogInputStream</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#getLogInputStream-java.io.File-long-">getLogInputStream</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> file, | |
| long offset)</code> | |
| <div class="block">Returns a <tt>LogInputStream</tt> object from the pool if it | |
| already exists.</div> | |
| </td> | |
| </tr> | |
| <tr id="i5" class="rowColor"> | |
| <td class="colFirst"><code>(package private) <a href="../../../../org/apache/river/mercury/LogOutputStream.html" title="class in org.apache.river.mercury">LogOutputStream</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#getLogOutputStream-java.io.File-long-">getLogOutputStream</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> file, | |
| long offset)</code> | |
| <div class="block">Returns a <tt>LogOutputStream</tt> object for the specified <tt>file</tt> | |
| from the pool if it already exists.</div> | |
| </td> | |
| </tr> | |
| <tr id="i6" class="altColor"> | |
| <td class="colFirst"><code>(package private) int</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#getPoolSize--">getPoolSize</a></span>()</code> </td> | |
| </tr> | |
| <tr id="i7" class="rowColor"> | |
| <td class="colFirst"><code>(package private) void</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#releaseLogStream-org.apache.river.mercury.LogStream-">releaseLogStream</a></span>(<a href="../../../../org/apache/river/mercury/LogStream.html" title="interface in org.apache.river.mercury">LogStream</a> stream)</code> | |
| <div class="block">Marks a stream as available for closing.</div> | |
| </td> | |
| </tr> | |
| <tr id="i8" class="altColor"> | |
| <td class="colFirst"><code>(package private) void</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/StreamPool.html#removeLogStream-org.apache.river.mercury.LogStream-">removeLogStream</a></span>(<a href="../../../../org/apache/river/mercury/LogStream.html" title="interface in org.apache.river.mercury">LogStream</a> stream)</code> | |
| <div class="block">Removes the given <tt>LogStream</tt> from the pool and closes it, | |
| if possible.</div> | |
| </td> | |
| </tr> | |
| </table> | |
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| <h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> | |
| </ul> | |
| </li> | |
| </ul> | |
| </li> | |
| </ul> | |
| </div> | |
| <div class="details"> | |
| <ul class="blockList"> | |
| <li class="blockList"> | |
| <!-- ============ FIELD DETAIL =========== --> | |
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| </a> | |
| <h3>Field Detail</h3> | |
| <a name="persistenceLogger"> | |
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| <h4>persistenceLogger</h4> | |
| <pre>private static final <a href="http://docs.oracle.com/javase/6/docs/api/java/util/logging/Logger.html?is-external=true" title="class or interface in java.util.logging">Logger</a> persistenceLogger</pre> | |
| <div class="block">Logger for lease related messages</div> | |
| </li> | |
| </ul> | |
| <a name="maxPoolSize"> | |
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| <h4>maxPoolSize</h4> | |
| <pre>private final int maxPoolSize</pre> | |
| <div class="block">Maximum limit for the number of concurrent <tt>LogStream</tt>s | |
| in the stream pool.</div> | |
| </li> | |
| </ul> | |
| <a name="pool"> | |
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| </a> | |
| <ul class="blockList"> | |
| <li class="blockList"> | |
| <h4>pool</h4> | |
| <pre>private final <a href="http://docs.oracle.com/javase/6/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a> pool</pre> | |
| <div class="block">Holds stream references by associated key</div> | |
| </li> | |
| </ul> | |
| <a name="freeList"> | |
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| </a> | |
| <ul class="blockListLast"> | |
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| <h4>freeList</h4> | |
| <pre>private final <a href="http://docs.oracle.com/javase/6/docs/api/java/util/LinkedList.html?is-external=true" title="class or interface in java.util">LinkedList</a> freeList</pre> | |
| <div class="block">Holds stream references in least recently used (released) order. | |
| It's used in order determine which stream to discard upon | |
| reaching the maximum pool limit.</div> | |
| </li> | |
| </ul> | |
| </li> | |
| </ul> | |
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| </a> | |
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| </a> | |
| <ul class="blockListLast"> | |
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| <h4>StreamPool</h4> | |
| <pre>StreamPool(int size)</pre> | |
| <div class="block">Simple constructor that creates a pool of given <code>size</code>.</div> | |
| <dl> | |
| <dt><span class="throwsLabel">Throws:</span></dt> | |
| <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - Thrown if the value of | |
| <tt>maxPoolSize</tt> is less than 1.</dd> | |
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| </a> | |
| <h3>Method Detail</h3> | |
| <a name="getControlLog-java.io.File-"> | |
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| <li class="blockList"> | |
| <h4>getControlLog</h4> | |
| <pre><a href="../../../../org/apache/river/mercury/ControlLog.html" title="class in org.apache.river.mercury">ControlLog</a> getControlLog(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> file) | |
| throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> | |
| <div class="block">Returns a <tt>ControlLog</tt> object for the specified <tt>file</tt> | |
| from the pool if it already exists. | |
| Otherwise, it creates a new instance and adds it to the pool.</div> | |
| <dl> | |
| <dt><span class="throwsLabel">Throws:</span></dt> | |
| <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd> | |
| </dl> | |
| </li> | |
| </ul> | |
| <a name="getLogInputStream-java.io.File-long-"> | |
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| <h4>getLogInputStream</h4> | |
| <pre><a href="../../../../org/apache/river/mercury/LogInputStream.html" title="class in org.apache.river.mercury">LogInputStream</a> getLogInputStream(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> file, | |
| long offset) | |
| throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> | |
| <div class="block">Returns a <tt>LogInputStream</tt> object from the pool if it | |
| already exists. Otherwise, it creates a new instance and adds | |
| it to the pool.</div> | |
| <dl> | |
| <dt><span class="throwsLabel">Throws:</span></dt> | |
| <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd> | |
| </dl> | |
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| <h4>getLogOutputStream</h4> | |
| <pre><a href="../../../../org/apache/river/mercury/LogOutputStream.html" title="class in org.apache.river.mercury">LogOutputStream</a> getLogOutputStream(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a> file, | |
| long offset) | |
| throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> | |
| <div class="block">Returns a <tt>LogOutputStream</tt> object for the specified <tt>file</tt> | |
| from the pool if it already exists. | |
| Otherwise, it creates a new instance and adds it to the pool.</div> | |
| <dl> | |
| <dt><span class="throwsLabel">Throws:</span></dt> | |
| <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd> | |
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| <h4>ensurePoolSpace</h4> | |
| <pre>private void ensurePoolSpace() | |
| throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> | |
| <div class="block">Ensures that room is available in the pool. If the pool is currently | |
| full, then the least recently used <tt>LogStream</tt> will be removed | |
| and closed to make room. This method will block if the pool is full and | |
| no <tt>LogStream</tt> objects can be closed.</div> | |
| <dl> | |
| <dt><span class="throwsLabel">Throws:</span></dt> | |
| <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd> | |
| </dl> | |
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| <h4>releaseLogStream</h4> | |
| <pre>void releaseLogStream(<a href="../../../../org/apache/river/mercury/LogStream.html" title="interface in org.apache.river.mercury">LogStream</a> stream)</pre> | |
| <div class="block">Marks a stream as available for closing. | |
| A log will only be closed if a new log is requested and the | |
| pool has reached its maximum size.</div> | |
| </li> | |
| </ul> | |
| <a name="removeLogStream-org.apache.river.mercury.LogStream-"> | |
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| <h4>removeLogStream</h4> | |
| <pre>void removeLogStream(<a href="../../../../org/apache/river/mercury/LogStream.html" title="interface in org.apache.river.mercury">LogStream</a> stream)</pre> | |
| <div class="block">Removes the given <tt>LogStream</tt> from the pool and closes it, | |
| if possible. The intent is for this method to be called for | |
| unusable logs so that they will no longer be returned by a | |
| subsequent call to one of the "get" methods.</div> | |
| </li> | |
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| <h4>getPoolSize</h4> | |
| <pre>int getPoolSize()</pre> | |
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| <pre>int getFreeSize()</pre> | |
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| <h4>dump</h4> | |
| <pre>void dump()</pre> | |
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