org.jgroups.protocols.HDRS 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.Message;
import org.jgroups.annotations.MBean;
import org.jgroups.annotations.Property;
import org.jgroups.stack.Protocol;
import org.jgroups.util.MessageBatch;

import java.util.function.Predicate;


/**
 * Prints the headers of all sent or received messages
 */
@MBean(description="Prints the headers of all sent and/or received messages")
public class HDRS extends Protocol {
    @Property(description="Enables printing of down messages")
    protected volatile boolean print_down=true;

    @Property(description="Enables printing of up (received) messages")
    protected volatile boolean print_up=true;

    // Filter to print messages on given conditions. If null, the filter is not active
    protected Predicate filter;

    public boolean printUp()                    {return print_up;}
    public HDRS    printUp(boolean b)           {print_up=b; return this;}
    public boolean printDown()                  {return print_down;}
    public HDRS    printDown(boolean b)         {print_down=b; return this;}
    public HDRS    filter(Predicate f) {filter=f; return this;}


    public Object down(Message msg) {
        if(print_down) {
            if(filter != null && filter.test(msg) == false)
                return down_prot.down(msg);
            System.out.printf("-- to %s (%d bytes): %s\n", msg.getDest(), msg.getLength(), msg.printHeaders());
        }
        return down_prot.down(msg);  // Pass on to the layer below us
    }

    public Object up(Message msg) {
        if(print_up) {
            if(filter != null && !filter.test(msg))
                return up_prot.up(msg);
            System.out.printf("-- from %s (%d bytes): %s\n", msg.getSrc(), msg.getLength(), msg.printHeaders());
        }
        return up_prot.up(msg); // Pass up to the layer above us
    }

    public void up(MessageBatch batch) {
        if(print_up) {
            if(filter != null && batch.anyMatch(filter) == false) {
                up_prot.up(batch);
                return;
            }
            for(Message msg: batch)
                System.out.printf("-- from %s (%d bytes): %s\n", msg.getSrc(), msg.getLength(), msg.printHeaders());
        }
        if(!batch.isEmpty())
            up_prot.up(batch);
    }




}