author | alanb |
Fri, 02 Nov 2012 15:50:11 +0000 | |
changeset 14342 | 8435a30053c1 |
parent 5506 | 202f599c92aa |
child 18574 | 4aeaeb541678 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2009, Oracle and/or its affiliates. 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.nio.channels; |
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import java.nio.ByteBuffer; |
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import java.util.concurrent.Future; |
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|
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/** |
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* An asynchronous channel that can read and write bytes. |
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* |
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* <p> Some channels may not allow more than one read or write to be outstanding |
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* at any given time. If a thread invokes a read method before a previous read |
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* operation has completed then a {@link ReadPendingException} will be thrown. |
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* Similarly, if a write method is invoked before a previous write has completed |
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* then {@link WritePendingException} is thrown. Whether or not other kinds of |
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* I/O operations may proceed concurrently with a read operation depends upon |
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* the type of the channel. |
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* |
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* <p> Note that {@link java.nio.ByteBuffer ByteBuffers} are not safe for use by |
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* multiple concurrent threads. When a read or write operation is initiated then |
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* care must be taken to ensure that the buffer is not accessed until the |
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* operation completes. |
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* |
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* @see Channels#newInputStream(AsynchronousByteChannel) |
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* @see Channels#newOutputStream(AsynchronousByteChannel) |
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* |
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* @since 1.7 |
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*/ |
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public interface AsynchronousByteChannel |
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extends AsynchronousChannel |
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{ |
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/** |
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* Reads a sequence of bytes from this channel into the given buffer. |
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* |
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* <p> This method initiates an asynchronous read operation to read a |
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* sequence of bytes from this channel into the given buffer. The {@code |
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* handler} parameter is a completion handler that is invoked when the read |
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* operation completes (or fails). The result passed to the completion |
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* handler is the number of bytes read or {@code -1} if no bytes could be |
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* read because the channel has reached end-of-stream. |
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* |
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* <p> The read operation may read up to <i>r</i> bytes from the channel, |
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* where <i>r</i> is the number of bytes remaining in the buffer, that is, |
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* {@code dst.remaining()} at the time that the read is attempted. Where |
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* <i>r</i> is 0, the read operation completes immediately with a result of |
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* {@code 0} without initiating an I/O operation. |
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* |
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* <p> Suppose that a byte sequence of length <i>n</i> is read, where |
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* <tt>0</tt> <tt><</tt> <i>n</i> <tt><=</tt> <i>r</i>. |
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* This byte sequence will be transferred into the buffer so that the first |
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* byte in the sequence is at index <i>p</i> and the last byte is at index |
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* <i>p</i> <tt>+</tt> <i>n</i> <tt>-</tt> <tt>1</tt>, |
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* where <i>p</i> is the buffer's position at the moment the read is |
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* performed. Upon completion the buffer's position will be equal to |
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* <i>p</i> <tt>+</tt> <i>n</i>; its limit will not have changed. |
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* |
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* <p> Buffers are not safe for use by multiple concurrent threads so care |
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* should be taken to not access the buffer until the operation has |
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* completed. |
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* |
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* <p> This method may be invoked at any time. Some channel types may not |
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* allow more than one read to be outstanding at any given time. If a thread |
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* initiates a read operation before a previous read operation has |
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* completed then a {@link ReadPendingException} will be thrown. |
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* |
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* @param dst |
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* The buffer into which bytes are to be transferred |
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* @param attachment |
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* The object to attach to the I/O operation; can be {@code null} |
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* @param handler |
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* The completion handler |
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* |
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* @throws IllegalArgumentException |
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* If the buffer is read-only |
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* @throws ReadPendingException |
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* If the channel does not allow more than one read to be outstanding |
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* and a previous read has not completed |
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* @throws ShutdownChannelGroupException |
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* If the channel is associated with a {@link AsynchronousChannelGroup |
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* group} that has terminated |
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*/ |
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<A> void read(ByteBuffer dst, |
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A attachment, |
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CompletionHandler<Integer,? super A> handler); |
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/** |
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* Reads a sequence of bytes from this channel into the given buffer. |
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* |
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* <p> This method initiates an asynchronous read operation to read a |
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* sequence of bytes from this channel into the given buffer. The method |
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* behaves in exactly the same manner as the {@link |
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* #read(ByteBuffer,Object,CompletionHandler) |
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* read(ByteBuffer,Object,CompletionHandler)} method except that instead |
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* of specifying a completion handler, this method returns a {@code Future} |
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* representing the pending result. The {@code Future}'s {@link Future#get() |
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* get} method returns the number of bytes read or {@code -1} if no bytes |
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* could be read because the channel has reached end-of-stream. |
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* |
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* @param dst |
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* The buffer into which bytes are to be transferred |
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* |
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* @return A Future representing the result of the operation |
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* |
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* @throws IllegalArgumentException |
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* If the buffer is read-only |
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* @throws ReadPendingException |
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* If the channel does not allow more than one read to be outstanding |
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* and a previous read has not completed |
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*/ |
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Future<Integer> read(ByteBuffer dst); |
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135 |
|
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/** |
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* Writes a sequence of bytes to this channel from the given buffer. |
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* |
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* <p> This method initiates an asynchronous write operation to write a |
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* sequence of bytes to this channel from the given buffer. The {@code |
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* handler} parameter is a completion handler that is invoked when the write |
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* operation completes (or fails). The result passed to the completion |
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* handler is the number of bytes written. |
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* |
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* <p> The write operation may write up to <i>r</i> bytes to the channel, |
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* where <i>r</i> is the number of bytes remaining in the buffer, that is, |
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* {@code src.remaining()} at the time that the write is attempted. Where |
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* <i>r</i> is 0, the write operation completes immediately with a result of |
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* {@code 0} without initiating an I/O operation. |
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* |
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* <p> Suppose that a byte sequence of length <i>n</i> is written, where |
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* <tt>0</tt> <tt><</tt> <i>n</i> <tt><=</tt> <i>r</i>. |
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* This byte sequence will be transferred from the buffer starting at index |
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* <i>p</i>, where <i>p</i> is the buffer's position at the moment the |
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* write is performed; the index of the last byte written will be |
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* <i>p</i> <tt>+</tt> <i>n</i> <tt>-</tt> <tt>1</tt>. |
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* Upon completion the buffer's position will be equal to |
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* <i>p</i> <tt>+</tt> <i>n</i>; its limit will not have changed. |
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* |
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* <p> Buffers are not safe for use by multiple concurrent threads so care |
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* should be taken to not access the buffer until the operation has |
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* completed. |
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* |
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* <p> This method may be invoked at any time. Some channel types may not |
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* allow more than one write to be outstanding at any given time. If a thread |
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* initiates a write operation before a previous write operation has |
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* completed then a {@link WritePendingException} will be thrown. |
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* |
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* @param src |
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* The buffer from which bytes are to be retrieved |
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* @param attachment |
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* The object to attach to the I/O operation; can be {@code null} |
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* @param handler |
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* The completion handler object |
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* |
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* @throws WritePendingException |
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* If the channel does not allow more than one write to be outstanding |
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* and a previous write has not completed |
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* @throws ShutdownChannelGroupException |
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* If the channel is associated with a {@link AsynchronousChannelGroup |
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* group} that has terminated |
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*/ |
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<A> void write(ByteBuffer src, |
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A attachment, |
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CompletionHandler<Integer,? super A> handler); |
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|
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/** |
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* Writes a sequence of bytes to this channel from the given buffer. |
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* |
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* <p> This method initiates an asynchronous write operation to write a |
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191 |
* sequence of bytes to this channel from the given buffer. The method |
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* behaves in exactly the same manner as the {@link |
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* #write(ByteBuffer,Object,CompletionHandler) |
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* write(ByteBuffer,Object,CompletionHandler)} method except that instead |
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* of specifying a completion handler, this method returns a {@code Future} |
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* representing the pending result. The {@code Future}'s {@link Future#get() |
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* get} method returns the number of bytes written. |
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* |
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* @param src |
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* The buffer from which bytes are to be retrieved |
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* |
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* @return A Future representing the result of the operation |
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203 |
* |
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* @throws WritePendingException |
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* If the channel does not allow more than one write to be outstanding |
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* and a previous write has not completed |
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*/ |
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Future<Integer> write(ByteBuffer src); |
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} |