author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2007-2009 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package java.nio.channels; |
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|
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import java.nio.channels.spi.AsynchronousChannelProvider; |
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import java.io.IOException; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.ThreadFactory; |
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import java.util.concurrent.TimeUnit; |
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|
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/** |
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* A grouping of asynchronous channels for the purpose of resource sharing. |
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* |
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* <p> An asynchronous channel group encapsulates the mechanics required to |
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* handle the completion of I/O operations initiated by {@link AsynchronousChannel |
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* asynchronous channels} that are bound to the group. A group has an associated |
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* thread pool to which tasks are submitted to handle I/O events and dispatch to |
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* {@link CompletionHandler completion-handlers} that consume the result of |
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* asynchronous operations performed on channels in the group. In addition to |
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* handling I/O events, the pooled threads may also execute other tasks required |
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* to support the execution of asynchronous I/O operations. |
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* |
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* <p> An asynchronous channel group is created by invoking the {@link |
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* #withFixedThreadPool withFixedThreadPool} or {@link #withCachedThreadPool |
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* withCachedThreadPool} methods defined here. Channels are bound to a group by |
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* specifying the group when constructing the channel. The associated thread |
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* pool is <em>owned</em> by the group; termination of the group results in the |
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* shutdown of the associated thread pool. |
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* |
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* <p> In addition to groups created explicitly, the Java virtual machine |
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* maintains a system-wide <em>default group</em> that is constructed |
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* automatically. Asynchronous channels that do not specify a group at |
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* construction time are bound to the default group. The default group has an |
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* associated thread pool that creates new threads as needed. The default group |
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* may be configured by means of system properties defined in the table below. |
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* Where the {@link java.util.concurrent.ThreadFactory ThreadFactory} for the |
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* default group is not configured then the pooled threads of the default group |
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* are {@link Thread#isDaemon daemon} threads. |
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* |
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* <table border> |
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* <tr> |
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* <th>System property</th> |
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* <th>Description</th> |
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* </tr> |
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* <tr> |
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* <tr> |
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* <td> {@code java.nio.channels.DefaultThreadPool.threadFactory} </td> |
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* <td> The value of this property is taken to be the fully-qualified name |
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* of a concrete {@link java.util.concurrent.ThreadFactory ThreadFactory} |
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* class. The class is loaded using the system class loader and instantiated. |
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* The factory's {@link java.util.concurrent.ThreadFactory#newThread |
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* newThread} method is invoked to create each thread for the default |
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* group's thread pool. If the process to load and instantiate the value |
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* of the property fails then an unspecified error is thrown during the |
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* construction of the default group. </td> |
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* </tr> |
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* <tr> |
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* <td> {@code java.nio.channels.DefaultThreadPool.initialSize} </td> |
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* <td> The value of the {@code initialSize} parameter for the default |
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* group (see {@link #withCachedThreadPool withCachedThreadPool}). |
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* The value of the property is taken to be the {@code String} |
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* representation of an {@code Integer} that is the initial size parameter. |
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* If the value cannot be parsed as an {@code Integer} it causes an |
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* unspecified error to be thrown during the construction of the default |
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* group. </td> |
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* </tr> |
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* </table> |
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* |
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* <a name="threading"><h4>Threading</h4></a> |
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* |
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* <p> The completion handler for an I/O operation initiated on a channel bound |
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* to a group is guaranteed to be invoked by one of the pooled threads in the |
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* group. This ensures that the completion handler is run by a thread with the |
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* expected <em>identity</em>. |
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* |
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* <p> Where an I/O operation completes immediately, and the initiating thread |
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* is one of the pooled threads in the group then the completion handler may |
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* be invoked directly by the initiating thread. To avoid stack overflow, an |
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* implementation may impose a limit as to the number of activations on the |
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* thread stack. Some I/O operations may prohibit invoking the completion |
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* handler directly by the initiating thread (see {@link |
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* AsynchronousServerSocketChannel#accept(Object,CompletionHandler) accept}). |
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* |
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* <a name="shutdown"><h4>Shutdown and Termination</h4></a> |
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* |
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* <p> The {@link #shutdown() shutdown} method is used to initiate an <em>orderly |
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* shutdown</em> of a group. An orderly shutdown marks the group as shutdown; |
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* further attempts to construct a channel that binds to the group will throw |
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* {@link ShutdownChannelGroupException}. Whether or not a group is shutdown can |
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* be tested using the {@link #isShutdown() isShutdown} method. Once shutdown, |
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* the group <em>terminates</em> when all asynchronous channels that are bound to |
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* the group are closed, all actively executing completion handlers have run to |
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* completion, and resources used by the group are released. No attempt is made |
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* to stop or interrupt threads that are executing completion handlers. The |
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* {@link #isTerminated() isTerminated} method is used to test if the group has |
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* terminated, and the {@link #awaitTermination awaitTermination} method can be |
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* used to block until the group has terminated. |
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* |
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* <p> The {@link #shutdownNow() shutdownNow} method can be used to initiate a |
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* <em>forceful shutdown</em> of the group. In addition to the actions performed |
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* by an orderly shutdown, the {@code shutdownNow} method closes all open channels |
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* in the group as if by invoking the {@link AsynchronousChannel#close close} |
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* method. |
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* |
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* @since 1.7 |
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* |
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* @see AsynchronousSocketChannel#open(AsynchronousChannelGroup) |
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* @see AsynchronousServerSocketChannel#open(AsynchronousChannelGroup) |
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*/ |
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133 |
|
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public abstract class AsynchronousChannelGroup { |
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private final AsynchronousChannelProvider provider; |
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136 |
|
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137 |
/** |
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* Initialize a new instance of this class. |
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139 |
* |
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* @param provider |
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* The asynchronous channel provider for this group |
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*/ |
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protected AsynchronousChannelGroup(AsynchronousChannelProvider provider) { |
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this.provider = provider; |
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} |
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146 |
|
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147 |
/** |
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* Returns the provider that created this channel group. |
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* |
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* @return The provider that created this channel group |
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*/ |
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public final AsynchronousChannelProvider provider() { |
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return provider; |
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} |
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155 |
|
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156 |
/** |
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* Creates an asynchronous channel group with a fixed thread pool. |
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158 |
* |
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159 |
* <p> The resulting asynchronous channel group reuses a fixed number of |
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* threads. At any point, at most {@code nThreads} threads will be active |
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* processing tasks that are submitted to handle I/O events and dispatch |
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* completion results for operations initiated on asynchronous channels in |
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* the group. |
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* |
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* <p> The group is created by invoking the {@link |
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* AsynchronousChannelProvider#openAsynchronousChannelGroup(int,ThreadFactory) |
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* openAsynchronousChannelGroup(int,ThreadFactory)} method of the system-wide |
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* default {@link AsynchronousChannelProvider} object. |
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* |
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* @param nThreads |
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* The number of threads in the pool |
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* @param threadFactory |
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* The factory to use when creating new threads |
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* |
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* @return A new asynchronous channel group |
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176 |
* |
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* @throws IllegalArgumentException |
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* If {@code nThreads <= 0} |
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* @throws IOException |
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* If an I/O error occurs |
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*/ |
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public static AsynchronousChannelGroup withFixedThreadPool(int nThreads, |
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ThreadFactory threadFactory) |
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throws IOException |
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185 |
{ |
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return AsynchronousChannelProvider.provider() |
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.openAsynchronousChannelGroup(nThreads, threadFactory); |
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188 |
} |
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189 |
|
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190 |
/** |
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191 |
* Creates an asynchronous channel group with a given thread pool that |
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* creates new threads as needed. |
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193 |
* |
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194 |
* <p> The {@code executor} parameter is an {@code ExecutorService} that |
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195 |
* creates new threads as needed to execute tasks that are submitted to |
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* handle I/O events and dispatch completion results for operations initiated |
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* on asynchronous channels in the group. It may reuse previously constructed |
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* threads when they are available. |
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199 |
* |
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200 |
* <p> The {@code initialSize} parameter may be used by the implementation |
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* as a <em>hint</em> as to the initial number of tasks it may submit. For |
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202 |
* example, it may be used to indictae the initial number of threads that |
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203 |
* wait on I/O events. |
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204 |
* |
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205 |
* <p> The executor is intended to be used exclusively by the resulting |
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206 |
* asynchronous channel group. Termination of the group results in the |
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* orderly {@link ExecutorService#shutdown shutdown} of the executor |
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* service. Shutting down the executor service by other means results in |
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* unspecified behavior. |
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210 |
* |
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211 |
* <p> The group is created by invoking the {@link |
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* AsynchronousChannelProvider#openAsynchronousChannelGroup(ExecutorService,int) |
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* openAsynchronousChannelGroup(ExecutorService,int)} method of the system-wide |
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* default {@link AsynchronousChannelProvider} object. |
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* |
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* @param executor |
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* The thread pool for the resulting group |
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* @param initialSize |
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* A value {@code >=0} or a negative value for implementation |
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* specific default |
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221 |
* |
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222 |
* @return A new asynchronous channel group |
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* |
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* @throws IOException |
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* If an I/O error occurs |
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* |
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* @see java.util.concurrent.Executors#newCachedThreadPool |
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*/ |
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public static AsynchronousChannelGroup withCachedThreadPool(ExecutorService executor, |
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int initialSize) |
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throws IOException |
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{ |
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return AsynchronousChannelProvider.provider() |
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.openAsynchronousChannelGroup(executor, initialSize); |
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} |
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|
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/** |
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* Creates an asynchronous channel group with a given thread pool. |
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* |
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* <p> The {@code executor} parameter is an {@code ExecutorService} that |
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* executes tasks submitted to dispatch completion results for operations |
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* initiated on asynchronous channels in the group. |
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* |
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* <p> Care should be taken when configuring the executor service. It |
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* should support <em>direct handoff</em> or <em>unbounded queuing</em> of |
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* submitted tasks, and the thread that invokes the {@link |
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* ExecutorService#execute execute} method should never invoke the task |
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* directly. An implementation may mandate additional constraints. |
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* |
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* <p> The executor is intended to be used exclusively by the resulting |
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* asynchronous channel group. Termination of the group results in the |
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* orderly {@link ExecutorService#shutdown shutdown} of the executor |
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* service. Shutting down the executor service by other means results in |
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* unspecified behavior. |
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* |
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* <p> The group is created by invoking the {@link |
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* AsynchronousChannelProvider#openAsynchronousChannelGroup(ExecutorService,int) |
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* openAsynchronousChannelGroup(ExecutorService,int)} method of the system-wide |
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* default {@link AsynchronousChannelProvider} object with an {@code |
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* initialSize} of {@code 0}. |
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* |
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* @param executor |
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* The thread pool for the resulting group |
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* |
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* @return A new asynchronous channel group |
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* |
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* @throws IOException |
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* If an I/O error occurs |
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*/ |
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public static AsynchronousChannelGroup withThreadPool(ExecutorService executor) |
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throws IOException |
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{ |
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return AsynchronousChannelProvider.provider() |
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.openAsynchronousChannelGroup(executor, 0); |
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} |
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|
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/** |
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* Tells whether or not this asynchronous channel group is shutdown. |
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* |
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* @return {@code true} if this asynchronous channel group is shutdown or |
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* has been marked for shutdown. |
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*/ |
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public abstract boolean isShutdown(); |
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|
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/** |
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* Tells whether or not this group has terminated. |
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* |
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* <p> Where this method returns {@code true}, then the associated thread |
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* pool has also {@link ExecutorService#isTerminated terminated}. |
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* |
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* @return {@code true} if this group has terminated |
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*/ |
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public abstract boolean isTerminated(); |
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|
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/** |
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* Initiates an orderly shutdown of the group. |
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* |
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* <p> This method marks the group as shutdown. Further attempts to construct |
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* channel that binds to this group will throw {@link ShutdownChannelGroupException}. |
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* The group terminates when all asynchronous channels in the group are |
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* closed, all actively executing completion handlers have run to completion, |
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* and all resources have been released. This method has no effect if the |
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* group is already shutdown. |
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*/ |
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public abstract void shutdown(); |
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|
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/** |
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* Shuts down the group and closes all open channels in the group. |
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* |
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* <p> In addition to the actions performed by the {@link #shutdown() shutdown} |
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* method, this method invokes the {@link AsynchronousChannel#close close} |
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* method on all open channels in the group. This method does not attempt to |
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* stop or interrupt threads that are executing completion handlers. The |
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* group terminates when all actively executing completion handlers have run |
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* to completion and all resources have been released. This method may be |
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* invoked at any time. If some other thread has already invoked it, then |
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* another invocation will block until the first invocation is complete, |
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* after which it will return without effect. |
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* |
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* @throws IOException |
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* If an I/O error occurs |
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*/ |
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public abstract void shutdownNow() throws IOException; |
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|
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/** |
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* Awaits termination of the group. |
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|
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* <p> This method blocks until the group has terminated, or the timeout |
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* occurs, or the current thread is interrupted, whichever happens first. |
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* |
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* @param timeout |
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* The maximum time to wait, or zero or less to not wait |
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* @param unit |
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* The time unit of the timeout argument |
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335 |
* |
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* @return {@code true} if the group has terminated; {@code false} if the |
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* timeout elapsed before termination |
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* |
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* @throws InterruptedException |
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* If interrupted while waiting |
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*/ |
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public abstract boolean awaitTermination(long timeout, TimeUnit unit) |
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throws InterruptedException; |
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} |