org.jgroups.protocols.TpHeader 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.AsciiString;

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


/**
 * Generic transport header, used by TP.
 * @author Bela Ban
 */
public class TpHeader extends Header {
    protected byte[] cluster_name;

    public TpHeader() { // used for externalization
    }

    public TpHeader(String n) {
        int len=n.length();
        cluster_name=new byte[len];
        for(int i=0; i < len; i++)
            cluster_name[i]=(byte)n.charAt(i);
    }

    public TpHeader(AsciiString n) {
        cluster_name=n != null? n.chars() : null;
    }

    public TpHeader(byte[] n) {
        cluster_name=n;
    }

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

    public short getMagicId() {return 60;}

    public String toString() {
        return String.format("[cluster=%s]", cluster_name != null ? new String(cluster_name) : "null");
    }

    public byte[] getClusterName() {return cluster_name;}

    @Override
    public int serializedSize() {
        return cluster_name != null? Global.SHORT_SIZE + cluster_name.length : Global.SHORT_SIZE;
    }

    @Override
    public void writeTo(DataOutput out) throws IOException {
        int length=cluster_name != null? cluster_name.length : -1;
        out.writeShort(length);
        if(cluster_name != null)
            out.write(cluster_name, 0, cluster_name.length);
    }

    @Override
    public void readFrom(DataInput in) throws IOException {
        int len=in.readShort();
        if(len >= 0) {
            cluster_name=new byte[len];
            in.readFully(cluster_name, 0, cluster_name.length);
        }
    }
}