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/*
* JBoss, Home of Professional Open Source
*
* Copyright 2013 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.conduits;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.util.Arrays;
import org.xnio.Buffers;
import org.xnio.Pooled;
import org.xnio.channels.StreamSourceChannel;
/**
* A stream sink conduit that buffers output data.
*
* @author David M. Lloyd
*/
public final class BufferedStreamSinkConduit extends AbstractStreamSinkConduit {
private final Pooled pooledBuffer;
private boolean terminate;
/**
* Construct a new instance.
*
* @param next the delegate conduit to set
* @param pooledBuffer the pooled buffer to use
*/
public BufferedStreamSinkConduit(final StreamSinkConduit next, final Pooled pooledBuffer) {
super(next);
this.pooledBuffer = pooledBuffer;
}
public long transferFrom(final FileChannel src, final long position, final long count) throws IOException {
return flushLocal() ? super.transferFrom(src, position, count) : 0L;
}
public long transferFrom(final StreamSourceChannel source, final long count, final ByteBuffer throughBuffer) throws IOException {
// todo: optimize to include our buffer in the copies
if (flushLocal()) {
return super.transferFrom(source, count, throughBuffer);
} else {
throughBuffer.limit(0);
return 0L;
}
}
public int write(final ByteBuffer src) throws IOException {
try {
final ByteBuffer buffer = pooledBuffer.getResource();
final int pos = buffer.position();
final int lim = buffer.limit();
final int srcRem = src.remaining();
final int ourRem = lim - pos;
if (srcRem < ourRem) {
buffer.put(src);
return srcRem;
} else if (buffer.position() == 0) {
final int res = super.write(src);
if (srcRem > res) {
final int cnt = Buffers.copy(buffer, src);
return res + cnt;
} else {
return res;
}
} else {
buffer.flip();
try {
super.write(new ByteBuffer[] { buffer, src }, 0, 2);
} finally {
buffer.compact();
}
if (src.hasRemaining()) {
Buffers.copy(buffer, src);
}
return srcRem - src.remaining();
}
} catch (IllegalStateException ignored) {
throw new ClosedChannelException();
}
}
public long write(final ByteBuffer[] srcs, final int offs, final int len) throws IOException {
if (len == 0) {
return 0L;
} else if (len == 1) {
return write(srcs[offs]);
} else try {
final ByteBuffer buffer = pooledBuffer.getResource();
final int pos = buffer.position();
final int lim = buffer.limit();
final long srcRem = Buffers.remaining(srcs, offs, len);
final int ourRem = lim - pos;
if (srcRem < ourRem) {
for (int i = 0; i < len; i++) {
buffer.put(srcs[i]);
}
return srcRem;
} else if (buffer.position() == 0) {
final long res = super.write(srcs, offs, len);
if (srcRem > res) {
final int cnt = Buffers.copy(buffer, srcs, offs, len);
return res + cnt;
} else {
return res;
}
} else {
buffer.flip();
try {
final ByteBuffer[] buffers;
if (offs > 0) {
buffers = Arrays.copyOfRange(srcs, offs - 1, offs + len);
} else {
buffers = new ByteBuffer[len + 1];
System.arraycopy(srcs, offs, buffers, 1, len);
}
buffers[0] = buffer;
super.write(buffers, 0, buffers.length);
} finally {
buffer.compact();
}
Buffers.copy(buffer, srcs, offs, len);
return srcRem - Buffers.remaining(srcs, offs, len);
}
} catch (IllegalStateException ignored) {
throw new ClosedChannelException();
}
}
private boolean flushLocal() throws IOException {
try {
final ByteBuffer buffer = pooledBuffer.getResource();
if (buffer.position() > 0) {
buffer.flip();
try {
for (;;) {
super.write(buffer);
if (! buffer.hasRemaining()) {
if (terminate) {
pooledBuffer.free();
}
return true;
}
}
} finally {
buffer.compact();
}
} else {
return true;
}
} catch (IllegalStateException ignored) {
return true;
}
}
@Override
public int writeFinal(ByteBuffer src) throws IOException {
//todo: non-naive implementations of this
return Conduits.writeFinalBasic(this, src);
}
@Override
public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
//todo: non-naive implementations of this
return Conduits.writeFinalBasic(this, srcs, offset, length);
}
public boolean flush() throws IOException {
return flushLocal() && super.flush();
}
public void truncateWrites() throws IOException {
pooledBuffer.free();
super.truncateWrites();
}
public void terminateWrites() throws IOException {
terminate = true;
super.terminateWrites();
}
}
