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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 java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.concurrent.TimeUnit;
import io.undertow.UndertowLogger;
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.ConduitStreamSourceChannel;
import io.undertow.UndertowMessages;
/**
* A stream source channel that can be marked as detached. Once this is marked as detached then
* calls will no longer be forwarded to the delegate.
*
* @author Stuart Douglas
*/
public abstract class DetachableStreamSourceChannel implements StreamSourceChannel{
protected final StreamSourceChannel delegate;
protected ChannelListener.SimpleSetter readSetter;
protected ChannelListener.SimpleSetter closeSetter;
public DetachableStreamSourceChannel(final StreamSourceChannel delegate) {
this.delegate = delegate;
}
protected abstract boolean isFinished();
@Override
public void resumeReads() {
if (isFinished()) {
return;
}
delegate.resumeReads();
}
public long transferTo(final long position, final long count, final FileChannel target) throws IOException {
if (isFinished()) {
return -1;
}
return delegate.transferTo(position, count, target);
}
public void awaitReadable() throws IOException {
if (isFinished()) {
return;
}
delegate.awaitReadable();
}
public void suspendReads() {
if (isFinished()) {
return;
}
delegate.suspendReads();
}
public long transferTo(final long count, final ByteBuffer throughBuffer, final StreamSinkChannel target) throws IOException {
if (isFinished()) {
return -1;
}
return delegate.transferTo(count, throughBuffer, target);
}
public XnioWorker getWorker() {
return delegate.getWorker();
}
public boolean isReadResumed() {
if (isFinished()) {
return false;
}
return delegate.isReadResumed();
}
public T setOption(final Option option, final T value) throws IllegalArgumentException, IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
return delegate.setOption(option, value);
}
public boolean supportsOption(final Option option) {
return delegate.supportsOption(option);
}
public void shutdownReads() throws IOException {
if (isFinished()) {
return;
}
delegate.shutdownReads();
}
public ChannelListener.Setter getReadSetter() {
if (readSetter == null) {
readSetter = new ChannelListener.SimpleSetter<>();
if (!isFinished()) {
if(delegate instanceof ConduitStreamSourceChannel) {
((ConduitStreamSourceChannel)delegate).setReadListener(new SetterDelegatingListener((ChannelListener.SimpleSetter)readSetter, this));
} else {
delegate.getReadSetter().set(new SetterDelegatingListener((ChannelListener.SimpleSetter)readSetter, this));
}
}
}
return readSetter;
}
public boolean isOpen() {
if (isFinished()) {
return false;
}
return delegate.isOpen();
}
public long read(final ByteBuffer[] dsts) throws IOException {
if (isFinished()) {
return -1;
}
return delegate.read(dsts);
}
public long read(final ByteBuffer[] dsts, final int offset, final int length) throws IOException {
if (isFinished()) {
return -1;
}
return delegate.read(dsts, offset, length);
}
public void wakeupReads() {
if (isFinished()) {
return;
}
delegate.wakeupReads();
}
public XnioExecutor getReadThread() {
return delegate.getReadThread();
}
public void awaitReadable(final long time, final TimeUnit timeUnit) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.channelIsClosed();
}
delegate.awaitReadable(time, timeUnit);
}
public ChannelListener.Setter getCloseSetter() {
if (closeSetter == null) {
closeSetter = new ChannelListener.SimpleSetter<>();
if (!isFinished()) {
if(delegate instanceof ConduitStreamSourceChannel) {
((ConduitStreamSourceChannel)delegate).setCloseListener(ChannelListeners.delegatingChannelListener(this, closeSetter));
} else {
delegate.getCloseSetter().set(ChannelListeners.delegatingChannelListener(this, closeSetter));
}
}
}
return closeSetter;
}
public void close() throws IOException {
if (isFinished()) {
return;
}
delegate.close();
}
public T getOption(final Option option) throws IOException {
if (isFinished()) {
throw UndertowMessages.MESSAGES.streamIsClosed();
}
return delegate.getOption(option);
}
public int read(final ByteBuffer dst) throws IOException {
if (isFinished()) {
return -1;
}
return delegate.read(dst);
}
@Override
public XnioIoThread getIoThread() {
return delegate.getIoThread();
}
private static class SetterDelegatingListener implements ChannelListener {
private final SimpleSetter setter;
private final StreamSourceChannel channel;
SetterDelegatingListener(final SimpleSetter setter, final StreamSourceChannel channel) {
this.setter = setter;
this.channel = channel;
}
public void handleEvent(final StreamSourceChannel channel) {
ChannelListener channelListener = setter.get();
if(channelListener != null) {
ChannelListeners.invokeChannelListener(this.channel, channelListener);
} else {
UndertowLogger.REQUEST_LOGGER.debugf("suspending reads on %s to prevent listener runaway", channel);
channel.suspendReads();
}
}
public String toString() {
return "Setter delegating channel listener -> " + setter;
}
}
}
