META-INF.modules.java.base.classes.java.nio.channels.WritableByteChannel Maven / Gradle / Ivy
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package java.nio.channels;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* A channel that can write bytes.
*
* Only one write operation upon a writable channel may be in progress at
* any given time. If one thread initiates a write operation upon a channel
* then any other thread that attempts to initiate another write operation will
* block until the first operation is complete. Whether or not other kinds of
* I/O operations may proceed concurrently with a write operation depends upon
* the type of the channel.
*
*
* @author Mark Reinhold
* @author JSR-51 Expert Group
* @since 1.4
*/
public interface WritableByteChannel
extends Channel
{
/**
* Writes a sequence of bytes to this channel from the given buffer.
*
* An attempt is made to write up to r bytes to the channel,
* where r is the number of bytes remaining in the buffer, that is,
* {@code src.remaining()}, at the moment this method is invoked.
*
*
Suppose that a byte sequence of length n is written, where
* {@code 0} {@code <=} n {@code <=} r.
* This byte sequence will be transferred from the buffer starting at index
* p, where p is the buffer's position at the moment this
* method is invoked; the index of the last byte written will be
* p {@code +} n {@code -} {@code 1}.
* Upon return the buffer's position will be equal to
* p {@code +} n; its limit will not have changed.
*
*
Unless otherwise specified, a write operation will return only after
* writing all of the r requested bytes. Some types of channels,
* depending upon their state, may write only some of the bytes or possibly
* none at all. A socket channel in non-blocking mode, for example, cannot
* write any more bytes than are free in the socket's output buffer.
*
*
This method may be invoked at any time. If another thread has
* already initiated a write operation upon this channel, however, then an
* invocation of this method will block until the first operation is
* complete.
*
* @param src
* The buffer from which bytes are to be retrieved
*
* @return The number of bytes written, possibly zero
*
* @throws NonWritableChannelException
* If this channel was not opened for writing
*
* @throws ClosedChannelException
* If this channel is closed
*
* @throws AsynchronousCloseException
* If another thread closes this channel
* while the write operation is in progress
*
* @throws ClosedByInterruptException
* If another thread interrupts the current thread
* while the write operation is in progress, thereby
* closing the channel and setting the current thread's
* interrupt status
*
* @throws IOException
* If some other I/O error occurs
*/
public int write(ByteBuffer src) throws IOException;
}