package org.jgroups.protocols;
import org.jgroups.Message;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
/**
* This bundler adds all (unicast or multicast) messages to a queue until max size has been exceeded, but does send
* messages immediately when no other messages are available. https://issues.jboss.org/browse/JGRP-1540
*/
public class TransferQueueBundler extends BaseBundler implements Runnable {
protected BlockingQueue<Message> queue;
protected List<Message> remove_queue;
protected volatile Thread bundler_thread;
protected volatile boolean running=true;
protected static final String THREAD_NAME="TQ-Bundler";
public TransferQueueBundler() {
this.remove_queue=new ArrayList<>(16);
}
protected TransferQueueBundler(BlockingQueue<Message> queue) {
this.queue=queue;
this.remove_queue=new ArrayList<>(16);
}
public TransferQueueBundler(int capacity) {
this(new ArrayBlockingQueue<>(assertPositive(capacity, "bundler capacity cannot be " + capacity)));
}
public Thread getThread() {return bundler_thread;}
public int getBufferSize() {return queue.size();}
public int removeQueueSize() {return remove_queue.size();}
public TransferQueueBundler removeQueueSize(int size) {this.remove_queue=new ArrayList<>(size); return this;}
public void init(TP transport) {
super.init(transport);
if(queue == null)
queue=new ArrayBlockingQueue<>(assertPositive(transport.getBundlerCapacity(), "bundler capacity cannot be " + transport.getBundlerCapacity()));
}
public synchronized void start() {
if(running)
stop();
bundler_thread=transport.getThreadFactory().newThread(this, THREAD_NAME);
running=true;
bundler_thread.start();
}
public synchronized void stop() {
running=false;
Thread tmp=bundler_thread;
bundler_thread=null;
if(tmp != null) {
tmp.interrupt();
if(tmp.isAlive()) {
try {tmp.join(500);} catch(InterruptedException e) {}
}
}
queue.clear();
}
public int size() {
return super.size() + removeQueueSize() + getBufferSize();
}
public void send(Message msg) throws Exception {
if(running)
queue.put(msg);
}
public void run() {
while(running) {
Message msg=null;
try {
if((msg=queue.take()) == null)
continue;
long size=msg.size();
if(count + size >= transport.getMaxBundleSize())
_sendBundledMessages();
_addMessage(msg, size);
while(true) {
remove_queue.clear();
int num_msgs=queue.drainTo(remove_queue);
if(num_msgs <= 0)
break;
for(int i=0; i < remove_queue.size(); i++) {
msg=remove_queue.get(i);
size=msg.size();
if(count + size >= transport.getMaxBundleSize())
_sendBundledMessages();
_addMessage(msg, size);
}
}
if(count > 0)
_sendBundledMessages();
}
catch(Throwable t) {
}
}
}
// This should not affect perf, as the lock is uncontended most of the time
protected void _sendBundledMessages() {
lock.lock();
try {
sendBundledMessages();
}
finally {
lock.unlock();
}
}
protected void _addMessage(Message msg, long size) {
lock.lock();
try {
addMessage(msg, size);
}
finally {
lock.unlock();
}
}
protected static int assertPositive(int value, String message) {
if(value <= 0) throw new IllegalArgumentException(message);
return value;
}
}