/*
* 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.util;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import io.undertow.UndertowLogger;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.IoUtils;
import org.xnio.channels.StreamSinkChannel;
/**
* A simple write listener that can be used to write out the contents of a String. When the string is written
* out it closes the channel.
*
* This should not be added directly to the channel, instead {@link #setup(org.xnio.channels.StreamSinkChannel)}
* should be called, which will attempt a write, and only add the listener if required.
*
* @author Stuart Douglas
*/
public class StringWriteChannelListener implements ChannelListener<StreamSinkChannel> {
private final ByteBuffer buffer;
public StringWriteChannelListener( final String string) {
this(string, Charset.defaultCharset());
}
public StringWriteChannelListener( final String string, Charset charset) {
buffer = ByteBuffer.wrap(string.getBytes(charset));
}
public void setup(final StreamSinkChannel channel) {
try {
int c;
do {
c = channel.write(buffer);
} while (buffer.hasRemaining() && c > 0);
if (buffer.hasRemaining()) {
channel.getWriteSetter().set(this);
channel.resumeWrites();
} else {
writeDone(channel);
}
} catch (IOException e) {
handleError(channel, e);
}
}
protected void handleError(StreamSinkChannel channel, IOException e) {
UndertowLogger.REQUEST_IO_LOGGER.ioException(e);
IoUtils.safeClose(channel);
}
@Override
public void handleEvent(final StreamSinkChannel channel) {
try {
int c;
do {
c = channel.write(buffer);
} while (buffer.hasRemaining() && c > 0);
if (buffer.hasRemaining()) {
channel.resumeWrites();
return;
} else {
writeDone(channel);
}
} catch (IOException e) {
handleError(channel, e);
}
}
public boolean hasRemaining() {
return buffer.hasRemaining();
}
protected void writeDone(final StreamSinkChannel channel) {
try {
channel.shutdownWrites();
if (!channel.flush()) {
channel.getWriteSetter().set(ChannelListeners.flushingChannelListener(new ChannelListener<StreamSinkChannel>() {
@Override
public void handleEvent(StreamSinkChannel o) {
IoUtils.safeClose(channel);
}
}, ChannelListeners.closingChannelExceptionHandler()));
channel.resumeWrites();
}
} catch (IOException e) {
handleError(channel, e);
}
}
}