org.jgroups.protocols.SimplifiedTransferQueueBundler Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.protocols;

import org.jgroups.Address;
import org.jgroups.Message;
import org.jgroups.util.Util;

import java.util.Objects;
import java.util.concurrent.ArrayBlockingQueue;

/**
 * This bundler uses the same logic as {@link TransferQueueBundler} but does not allocate
 * memory except for the buffer itself and does not use complex data structures.
 * @author Radim Vansa
 */
public class SimplifiedTransferQueueBundler extends TransferQueueBundler {
    protected static final int MSG_BUF_SIZE=512;
    protected final Message[]  msg_queue=new Message[MSG_BUF_SIZE];
    protected int              curr;

    public SimplifiedTransferQueueBundler() {
    }

    public SimplifiedTransferQueueBundler(int capacity) {
        super(new ArrayBlockingQueue<>(assertPositive(capacity, "bundler capacity cannot be " + capacity)));
    }

    public int size() {
        return curr + removeQueueSize();
    }

    @Override protected void addMessage(Message msg, int size) {
        try {
            while(curr < MSG_BUF_SIZE && msg_queue[curr] != null) ++curr;
            if(curr < MSG_BUF_SIZE) {
                msg_queue[curr]=msg;
                ++curr;
            }
            else {
                sendBundledMessages(); // sets curr to 0
                msg_queue[0]=msg;
            }
        }
        finally {
            count+=size;
        }
    }

    protected void sendBundledMessages() {
        try {
            _sendBundledMessages();
        }
        finally {
            curr=0;
        }
    }

    protected void _sendBundledMessages() {
        int start=0;
        for(;;) {
            for(; start < MSG_BUF_SIZE && msg_queue[start] == null; ++start) ;
            if(start >= MSG_BUF_SIZE) {
                count=0;
                return;
            }
            Address dest=msg_queue[start].getDest();
            int numMsgs=1;
            for(int i=start + 1; i < MSG_BUF_SIZE; ++i) {
                Message msg=msg_queue[i];
                if(msg != null && (dest == msg.getDest() || (Objects.equals(dest, msg.getDest())))) {
                    msg.setDest(dest); // avoid further equals() calls
                    numMsgs++;
                }
            }
            try {
                output.position(0);
                if(numMsgs == 1) {
                    sendSingleMessage(msg_queue[start]);
                    msg_queue[start]=null;
                }
                else {
                    Util.writeMessageListHeader(dest, msg_queue[start].getSrc(), transport.cluster_name.chars(), numMsgs, output, dest == null);
                    for(int i=start; i < MSG_BUF_SIZE; ++i) {
                        Message msg=msg_queue[i];
                        // since we assigned the matching destination we can do plain ==
                        if(msg != null && msg.getDest() == dest) {
                            output.writeShort(msg.getType());
                            msg.writeToNoAddrs(msg.getSrc(), output, transport.getId());
                            msg_queue[i]=null;
                        }
                    }
                    transport.doSend(output.buffer(), 0, output.position(), dest);
                }
                start++;
            }
            catch(Exception e) {
                log.error("Failed to send message", e);
            }
        }
    }


}