/
GelfUdpAppender.java
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/
GelfUdpAppender.java
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/*
* Logback GELF - zero dependencies Logback GELF appender library.
* Copyright (C) 2016 Oliver Siegmar
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package de.siegmar.logbackgelf;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.util.Objects;
import java.util.function.LongSupplier;
import de.siegmar.logbackgelf.compressor.Compressor;
public class GelfUdpAppender extends AbstractGelfAppender {
/**
* Maximum size of GELF chunks in bytes. Default chunk size is 508 - this prevents
* IP packet fragmentation. This is also the recommended minimum.
*/
private Integer maxChunkSize;
/**
* Compression method used (NONE, GZIP or ZLIB). Default: GZIP.
*/
private CompressionMethod compressionMethod = CompressionMethod.GZIP;
private LongSupplier messageIdSupplier = new MessageIdSupplier();
private RobustChannel robustChannel;
private GelfUdpChunker chunker;
private AddressResolver addressResolver;
private Compressor compressor;
public Integer getMaxChunkSize() {
return maxChunkSize;
}
public void setMaxChunkSize(final Integer maxChunkSize) {
this.maxChunkSize = maxChunkSize;
}
public CompressionMethod getCompressionMethod() {
return compressionMethod;
}
public void setCompressionMethod(final CompressionMethod compressionMethod) {
this.compressionMethod = Objects.requireNonNull(compressionMethod, "compressionMethod must not be null");
}
public LongSupplier getMessageIdSupplier() {
return messageIdSupplier;
}
public void setMessageIdSupplier(final LongSupplier messageIdSupplier) {
this.messageIdSupplier = Objects.requireNonNull(messageIdSupplier, "messageIdSupplier must not be null");
}
@Override
protected void startAppender() throws IOException {
robustChannel = new RobustChannel();
chunker = new GelfUdpChunker(messageIdSupplier, maxChunkSize);
addressResolver = new AddressResolver(getGraylogHost());
compressor = compressionMethod.getCompressor();
}
@Override
protected void appendMessage(final byte[] binMessage) throws IOException {
final byte[] messageToSend = compressor.compress(binMessage);
final InetSocketAddress remote = new InetSocketAddress(addressResolver.resolve(),
getGraylogPort());
for (final ByteBuffer chunk : chunker.chunks(messageToSend)) {
while (chunk.hasRemaining()) {
robustChannel.send(chunk, remote);
}
}
}
@Override
protected void close() throws IOException {
robustChannel.close();
}
private static final class RobustChannel {
private volatile DatagramChannel channel;
private volatile boolean stopped;
RobustChannel() throws IOException {
this.channel = DatagramChannel.open();
}
void send(final ByteBuffer src, final SocketAddress target) throws IOException {
getChannel().send(src, target);
}
@SuppressWarnings("PMD.CloseResource")
private DatagramChannel getChannel() throws IOException {
DatagramChannel tmp = channel;
if (!tmp.isOpen()) {
synchronized (this) {
tmp = channel;
if (!tmp.isOpen() && !stopped) {
tmp = DatagramChannel.open();
channel = tmp;
}
}
}
return tmp;
}
synchronized void close() throws IOException {
channel.close();
stopped = true;
}
}
}