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/*
* 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.channels;
import io.undertow.UndertowLogger;
import io.undertow.UndertowMessages;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.Option;
import org.xnio.XnioExecutor;
import org.xnio.XnioIoThread;
import org.xnio.XnioWorker;
import org.xnio.channels.StreamSinkChannel;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.ConduitStreamSinkChannel;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.concurrent.TimeUnit;
/**
* Stream sink channel. When this channel is considered detached it will no longer forward
* calls to the delegate
*
* @author Stuart Douglas
*/
public abstract class DetachableStreamSinkChannel implements StreamSinkChannel {
protected final StreamSinkChannel delegate;
protected ChannelListener.SimpleSetter writeSetter;
protected ChannelListener.SimpleSetter closeSetter;
public DetachableStreamSinkChannel(final StreamSinkChannel delegate) {
this.delegate = delegate;
}
protected abstract boolean isFinished();
@Override
public void suspendWrites() {
if (isFinished()) {
return;
}
delegate.suspendWrites();
}
@Override
public boolean isWriteResumed() {
if (isFinished()) {
return false;
}
return delegate.isWriteResumed();
}
@Override
public void shutdownWrites() throws IOException {
if (isFinished()) {
return;
}
delegate.shutdownWrites();
}
@Override
public void awaitWritable() throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
delegate.awaitWritable();
}
@Override
public void awaitWritable(final long time, final TimeUnit timeUnit) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
delegate.awaitWritable(time, timeUnit);
}
@Override
public XnioExecutor getWriteThread() {
return delegate.getWriteThread();
}
@Override
public boolean isOpen() {
return !isFinished() && delegate.isOpen();
}
@Override
public void close() throws IOException {
if (isFinished()) return;
delegate.close();
}
@Override
public boolean flush() throws IOException {
if (isFinished()) {
return true;
}
return delegate.flush();
}
@Override
public long transferFrom(final FileChannel src, final long position, final long count) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.transferFrom(src, position, count);
}
@Override
public long transferFrom(final StreamSourceChannel source, final long count, final ByteBuffer throughBuffer) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.transferFrom(source, count, throughBuffer);
}
@Override
public ChannelListener.Setter getWriteSetter() {
if (writeSetter == null) {
writeSetter = new ChannelListener.SimpleSetter<>();
if (!isFinished()) {
if(delegate instanceof ConduitStreamSinkChannel) {
((ConduitStreamSinkChannel) delegate).setWriteListener(new SetterDelegatingListener((ChannelListener.SimpleSetter)writeSetter, this));
} else {
delegate.getWriteSetter().set(new SetterDelegatingListener((ChannelListener.SimpleSetter)writeSetter, this));
}
}
}
return writeSetter;
}
@Override
public ChannelListener.Setter getCloseSetter() {
if (closeSetter == null) {
closeSetter = new ChannelListener.SimpleSetter<>();
if (!isFinished()) {
delegate.getCloseSetter().set(ChannelListeners.delegatingChannelListener(this, closeSetter));
}
}
return closeSetter;
}
@Override
public XnioWorker getWorker() {
return delegate.getWorker();
}
@Override
public XnioIoThread getIoThread() {
return delegate.getIoThread();
}
@Override
public long write(final ByteBuffer[] srcs, final int offset, final int length) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.write(srcs, offset, length);
}
@Override
public long write(final ByteBuffer[] srcs) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.write(srcs);
}
@Override
public int writeFinal(ByteBuffer src) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.writeFinal(src);
}
@Override
public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.writeFinal(srcs, offset, length);
}
@Override
public long writeFinal(ByteBuffer[] srcs) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.writeFinal(srcs);
}
@Override
public boolean supportsOption(final Option option) {
return delegate.supportsOption(option);
}
@Override
public T getOption(final Option option) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.getOption(option);
}
@Override
public T setOption(final Option option, final T value) throws IllegalArgumentException, IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.setOption(option, value);
}
@Override
public int write(final ByteBuffer src) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.write(src);
}
@Override
public void resumeWrites() {
if (isFinished()) {
return;
}
delegate.resumeWrites();
}
@Override
public void wakeupWrites() {
if (isFinished()) {
return;
}
delegate.wakeupWrites();
}
public void responseDone() {
if(delegate instanceof ConduitStreamSinkChannel) {
((ConduitStreamSinkChannel) delegate).setCloseListener(null);
((ConduitStreamSinkChannel) delegate).setWriteListener(null);
} else {
delegate.getCloseSetter().set(null);
delegate.getWriteSetter().set(null);
}
if (delegate.isWriteResumed()) {
delegate.suspendWrites();
}
}
private static class SetterDelegatingListener implements ChannelListener {
private final SimpleSetter setter;
private final StreamSinkChannel channel;
SetterDelegatingListener(final SimpleSetter setter, final StreamSinkChannel channel) {
this.setter = setter;
this.channel = channel;
}
public void handleEvent(final StreamSinkChannel channel) {
ChannelListener channelListener = setter.get();
if(channelListener != null) {
ChannelListeners.invokeChannelListener(this.channel, channelListener);
} else {
UndertowLogger.REQUEST_LOGGER.debugf("suspending writes on %s to prevent listener runaway", channel);
channel.suspendWrites();
}
}
public String toString() {
return "Setter delegating channel listener -> " + setter;
}
}
}
