io.undertow.conduits.PreChunkedStreamSinkConduit Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.conduits;
import io.undertow.UndertowMessages;
import io.undertow.server.protocol.http.HttpAttachments;
import io.undertow.util.Attachable;
import org.xnio.IoUtils;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.AbstractStreamSinkConduit;
import org.xnio.conduits.ConduitWritableByteChannel;
import org.xnio.conduits.Conduits;
import org.xnio.conduits.StreamSinkConduit;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.util.concurrent.TimeUnit;
import static org.xnio.Bits.allAreClear;
import static org.xnio.Bits.anyAreSet;
/**
* Channel that implements HTTP chunked transfer coding for data streams that already have chunk markers.
*
* @author Stuart Douglas
*/
public class PreChunkedStreamSinkConduit extends AbstractStreamSinkConduit {
private final ConduitListener finishListener;
/**
* Flag that is set when {@link #terminateWrites()} or @{link #close()} is called
*/
private static final int FLAG_WRITES_SHUTDOWN = 1;
private static final int FLAG_FINISHED = 1 << 2;
int state = 0;
final ChunkReader chunkReader;
/**
* Construct a new instance.
*
* @param next the channel to wrap
* @param finishListener The finish listener
* @param attachable The attachable
*/
public PreChunkedStreamSinkConduit(final StreamSinkConduit next, final ConduitListener finishListener, final Attachable attachable) {
super(next);
//we don't want the reader to call the finish listener, so we pass null
this.chunkReader = new ChunkReader<>(attachable, HttpAttachments.RESPONSE_TRAILERS, this);
this.finishListener = finishListener;
}
@Override
public int write(final ByteBuffer src) throws IOException {
return doWrite(src);
}
int doWrite(final ByteBuffer src) throws IOException {
if (anyAreSet(state, FLAG_WRITES_SHUTDOWN)) {
throw new ClosedChannelException();
}
if (chunkReader.getChunkRemaining() == -1) {
throw UndertowMessages.MESSAGES.extraDataWrittenAfterChunkEnd();
}
if (src.remaining() == 0) {
return 0;
}
int oldPos = src.position();
int oldLimit = src.limit();
int ret = next.write(src);
if(ret == 0) {
return ret;
}
int newPos = src.position();
src.position(oldPos);
src.limit(oldPos + ret);
try {
while (true) {
long chunkRemaining = chunkReader.readChunk(src);
if (chunkRemaining == -1) {
if (src.remaining() == 0) {
return ret;
} else {
throw UndertowMessages.MESSAGES.extraDataWrittenAfterChunkEnd();
}
} else if(chunkRemaining == 0) {
return ret;
}
int remaining;
if (src.remaining() >= chunkRemaining) {
src.position((int) (src.position() + chunkRemaining));
remaining = 0;
} else {
remaining = (int) (chunkRemaining - src.remaining());
src.position(src.limit());
}
chunkReader.setChunkRemaining(remaining);
if (!src.hasRemaining()) {
break;
}
}
} finally {
src.position(newPos);
src.limit(oldLimit);
}
return ret;
}
@Override
public long write(final ByteBuffer[] srcs, final int offset, final int length) throws IOException {
for (int i = offset; i < length; ++i) {
if (srcs[i].hasRemaining()) {
return write(srcs[i]);
}
}
return 0;
}
@Override
public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
return Conduits.writeFinalBasic(this, srcs, offset, length);
}
@Override
public int writeFinal(ByteBuffer src) throws IOException {
if (!src.hasRemaining()) {
terminateWrites();
return 0;
}
int ret = doWrite(src);
terminateWrites();
return ret;
}
@Override
public long transferFrom(final FileChannel src, final long position, final long count) throws IOException {
if (anyAreSet(state, FLAG_WRITES_SHUTDOWN)) {
throw new ClosedChannelException();
}
return src.transferTo(position, count, new ConduitWritableByteChannel(this));
}
@Override
public long transferFrom(final StreamSourceChannel source, final long count, final ByteBuffer throughBuffer) throws IOException {
if (anyAreSet(state, FLAG_WRITES_SHUTDOWN)) {
throw new ClosedChannelException();
}
return IoUtils.transfer(source, count, throughBuffer, new ConduitWritableByteChannel(this));
}
@Override
public boolean flush() throws IOException {
if (anyAreSet(state, FLAG_WRITES_SHUTDOWN)) {
boolean val = next.flush();
if (val && allAreClear(state, FLAG_FINISHED)) {
invokeFinishListener();
}
return val;
} else {
return next.flush();
}
}
private void invokeFinishListener() {
state |= FLAG_FINISHED;
if (finishListener != null) {
finishListener.handleEvent(this);
}
}
@Override
public void terminateWrites() throws IOException {
if (anyAreSet(state, FLAG_WRITES_SHUTDOWN)) {
return;
}
if (chunkReader.getChunkRemaining() != -1) {
throw UndertowMessages.MESSAGES.chunkedChannelClosedMidChunk();
}
state |= FLAG_WRITES_SHUTDOWN;
}
@Override
public void awaitWritable() throws IOException {
next.awaitWritable();
}
@Override
public void awaitWritable(final long time, final TimeUnit timeUnit) throws IOException {
next.awaitWritable(time, timeUnit);
}
}