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/*
* JBoss, Home of Professional Open Source
*
* Copyright 2008 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.xnio.channels;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.FileChannel;
import java.io.IOException;
import org.xnio.ChannelListener;
/**
* A stream sink channel. This type of channel is a writable destination for bytes. While all channel types are
* thread-safe, writing a stream from more than one thread concurrently will cause data corruption and may be
* disallowed at the option of the implementation.
*/
public interface StreamSinkChannel extends WritableByteChannel, GatheringByteChannel, SuspendableWriteChannel {
/**
* Transfer bytes into this channel from the given file. Using this method in preference to {@link FileChannel#transferTo(long, long, WritableByteChannel)}
* may provide a performance advantage on some platforms.
* <p>
* If the current thread is interrupted when this method is called, it may throw a {@link java.io.InterruptedIOException};
* however, if this exception is thrown, the {@link java.io.InterruptedIOException#bytesTransferred} field is
* guaranteed to be 0.
*
* @param src the file to read from
* @param position the position within the file from which the transfer is to begin
* @param count the number of bytes to be transferred
* @return the number of bytes (possibly 0) that were actually transferred
* @throws IOException if an I/O error occurs
*/
long transferFrom(FileChannel src, long position, long count) throws IOException;
/**
* Transfers bytes from the given channel source. On some platforms, this may avoid copying bytes between user
* and kernel space. On other platforms, bytes are passed through the {@code throughBuffer} parameter's buffer
* space. On entry, {@code throughBuffer} will be cleared. On exit, the buffer will be
* flipped for emptying, and may be empty or may contain data. If this method returns a value less than
* {@code count}, then the remaining data in {@code throughBuffer} may contain data read from {@code source} which must
* be written to this channel to complete the operation. Note that using a direct buffer may provide an
* intermediate performance gain on platforms without zero-copy facilities.
* <p>
* If the current thread is interrupted when this method is called, it may throw a {@link java.io.InterruptedIOException};
* however, if this exception is thrown, the {@link java.io.InterruptedIOException#bytesTransferred} field is
* guaranteed to be 0.
*
* @param source the source to read from
* @param count the number of bytes to be transferred
* @param throughBuffer the buffer to copy through.
* @return the number of bytes (possibly 0) that were actually transferred, or -1 if the end of input was reached
* @throws IOException if an I/O error occurs
*/
long transferFrom(StreamSourceChannel source, long count, ByteBuffer throughBuffer) throws IOException;
/** {@inheritDoc} */
ChannelListener.Setter<? extends StreamSinkChannel> getWriteSetter();
/** {@inheritDoc} */
ChannelListener.Setter<? extends StreamSinkChannel> getCloseSetter();
/**
*
* Writes some data to the channel, with the same semantics as
* {@link #write(java.nio.ByteBuffer)}. If all the data is written
* out then the channel will have its writes shutdown. Semantically this
* method is equivalent to:
* <code>
* int rem = src.remaining();
* int written = channel.write(src);
* if(written == rem) {
* channel.shutdownWrites()
* }
* </code>
*
* If an exception is thrown the caller is still responsible for closing the channel.
*
* @see WritableByteChannel#write(java.nio.ByteBuffer)
* @see SuspendableWriteChannel#shutdownWrites()
* @param src The data to write
* @return The amount of data that was actually written.
*/
public int writeFinal(ByteBuffer src) throws IOException;
/**
*
* Writes some data to the channel, with the same semantics as
* {@link #write(java.nio.ByteBuffer[], int, int)}. If all the data is written
* out then the channel will have its writes shutdown.
*
* If an exception is thrown the caller is still responsible for closing the channel.
*
* @see GatheringByteChannel#write(java.nio.ByteBuffer[], int, int)
*
* @see SuspendableWriteChannel#shutdownWrites()
*
* @param srcs
* The buffers from which bytes are to be retrieved
*
* @param offset
* The offset within the buffer array of the first buffer from
* which bytes are to be retrieved; must be non-negative and no
* larger than <tt>srcs.length</tt>
*
* @param length
* The maximum number of buffers to be accessed; must be
* non-negative and no larger than
* <tt>srcs.length</tt> - <tt>offset</tt>
*
* @return The amount of data that was actually written
*/
public long writeFinal(ByteBuffer[] srcs, int offset, int length)
throws IOException;
/**
*
* Writes some data to the channel, with the same semantics as
* {@link #write(java.nio.ByteBuffer[])}. If all the data is written
* out then the channel will have its writes shutdown.
*
* If an exception is thrown the caller is still responsible for closing the channel.
*
* @see GatheringByteChannel#write(java.nio.ByteBuffer[])
*
* @see SuspendableWriteChannel#shutdownWrites()
*
* @param srcs
* The buffers from which bytes are to be retrieved
*
* @return The amount of data that was actually written
*/
public long writeFinal(ByteBuffer[] srcs) throws IOException;
}
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