org.jgroups.protocols.PingHeader 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.Global;
import org.jgroups.Header;
import org.jgroups.util.Bits;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.function.Supplier;


/**
 * Used to send discovery requests and responses
 * @author Bela Ban
 */
public class PingHeader extends Header {
    public static final byte GET_MBRS_REQ=1;
    public static final byte GET_MBRS_RSP=2;

    protected byte    type;
    protected String  cluster_name;
    protected boolean initial_discovery;


    public PingHeader() {
    }

    public PingHeader(byte type)                   {this.type=type;}
    public byte       type()                       {return type;}
    public PingHeader clusterName(String name)     {this.cluster_name=name; return this;}
    public boolean    initialDiscovery()           {return initial_discovery;}
    public PingHeader initialDiscovery(boolean b)  {this.initial_discovery=b; return this;}
    public short      getMagicId()                 {return 53;}

    public Supplier create() {return PingHeader::new;}

    @Override
    public int serializedSize() {
        int retval=Global.BYTE_SIZE *3; // type, cluster_name presence and initial_discovery
        if(cluster_name != null)
            retval += cluster_name.length() +2;
        return retval;
    }

    public String toString() {
        return String.format("[%s cluster=%s initial_discovery=%b]", type2Str(type), cluster_name, initial_discovery);
    }

    static String type2Str(byte t) {
        switch(t) {
            case GET_MBRS_REQ: return "GET_MBRS_REQ";
            case GET_MBRS_RSP: return "GET_MBRS_RSP";
            default:           return "";
        }
    }

    @Override
    public void writeTo(DataOutput out) throws IOException {
        out.writeByte(type);
        Bits.writeString(cluster_name,out);
        out.writeBoolean(initial_discovery);
    }

    @Override
    public void readFrom(DataInput in) throws IOException {
        type=in.readByte();
        cluster_name=Bits.readString(in);
        initial_discovery=in.readBoolean();
    }
}