org.jgroups.protocols.SNIFF 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;

/**
 * Protocol trying to print message payloads as strings
 * @author Bela Ban
 * @since  4.0
 */
@MBean(description="Protocol trying to print payloads as strings")
public class SNIFF extends Protocol {
    @Property(description="Print received messages")
    protected boolean up=true;

    @Property(description="Print sent messages")
    protected boolean down;


    public Object down(Message msg) {
        if(down)
            dump("down msg", msg);
        return down_prot.down(msg);
    }

    public Object up(Message msg) {
        if(up)
            dump("up msg", msg);
        return up_prot.up(msg);
    }

    public void up(MessageBatch batch) {
        int count=1;
        for(Message msg: batch)
            dump("batch msg#" + count++, msg);

        up_prot.up(batch);
    }



    protected static void dump(String type, Message msg) {
        StringBuilder sb=new StringBuilder();
        sb.append(String.format("\n%s from %s (%d bytes):\nhdrs: %s\n", type, msg.src(), msg.getLength(), msg.printHeaders()));
        if(msg.getLength() > 0) {
            sb.append("payload: ");
            printPayload(msg, sb);
            sb.append("\n");
        }
        System.out.println(sb.toString());
    }

    protected static String printPayload(Message msg, final StringBuilder sb) {
        byte[] payload=msg.getRawBuffer();
        int print_max=Math.min(msg.getLength(), 50);
        for(int i=msg.getOffset(); i < print_max; i++) {
            byte ch=payload[i];
            sb.append((char)ch);
        }
        return null;
    }
}