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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.logserver.handlers.replicator;
import java.io.IOException;
import java.nio.channels.SocketChannel;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;
import com.yahoo.io.Connection;
import com.yahoo.io.ConnectionFactory;
import com.yahoo.io.Listener;
import com.yahoo.log.LogLevel;
import com.yahoo.log.LogMessage;
import com.yahoo.logserver.handlers.AbstractLogHandler;
/**
* The Replicator plugin is used for replicating log messages sent
* to the logserver.
* <p>
* Per default the replicator will start dropping messages enqueued
* to a client if the outbound message queue reaches 5000 messages.
* This limit can be configured by setting the system property
* <code>logserver.replicator.maxqueuelength</code> to the desired
* value.
*
* @author Bjorn Borud
*/
public class Replicator extends AbstractLogHandler implements ConnectionFactory {
private static final Logger log = Logger.getLogger(Replicator.class.getName());
private int port;
private Listener listener;
private final Set<ReplicatorConnection> connections = new HashSet<ReplicatorConnection>();
private final FormattedBufferCache bufferCache = new FormattedBufferCache();
/**
* @param port The port to which the replicator listens.
*/
public Replicator(int port) throws IOException {
this.port = port;
listen(port);
}
public Replicator() {
}
public void listen(int port) throws IOException {
if (listener != null) {
throw new IllegalStateException("already listening to port " + this.port);
}
listener = new Listener("replicator");
listener.listen(this, port);
listener.start();
log.log(LogLevel.CONFIG, "port=" + port);
}
public synchronized boolean doHandle(LogMessage msg) {
boolean logged = false;
bufferCache.reset();
for (ReplicatorConnection c : connections) {
try {
if (c.isLoggable(msg)) {
c.enqueue(bufferCache.getFormatted(msg, c.formatter));
logged = true;
}
} catch (IOException e) {
log.log(LogLevel.DEBUG, "Writing failed", e);
}
}
return logged;
}
public void close() {
// kill the listener thread, then wait for it to
// shut down.
try {
listener.interrupt();
listener.join();
log.log(LogLevel.DEBUG, "Replicator listener stopped");
} catch (InterruptedException e) {
log.log(LogLevel.WARNING,
"Replicator listener was interrupted",
e);
}
}
/**
* Currently a NOP, but we might want to have some best-effort
* mechanism for trying to flush all connections within some
* time-frame.
*/
public void flush() {}
/**
* Factory method for wrapping new connections in the proper
* (Replicator)Connection objects.
*
* @param socket The new SocketChannel
* @param listener The Listener instance we want to use
*/
public synchronized Connection newConnection(SocketChannel socket,
Listener listener) {
if (log.isLoggable(LogLevel.DEBUG)) {
log.fine("New replicator connection: " + socket);
}
ReplicatorConnection n =
new ReplicatorConnection(socket, listener, this);
connections.add(n);
return n;
}
/**
* Removes a ReplicatorConnection from the set of active
* connections.
*/
protected synchronized void deRegisterConnection(ReplicatorConnection conn) {
connections.remove(conn);
}
public String toString() {
return Replicator.class.getName();
}
}
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