/*
* 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);
}
}
}