org.jgroups.protocols.Frag3Header 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;


/**
 * @author Bela Ban
 */
public class Frag3Header extends Header {
    protected int     id;              // unique sequence number - same for all fragments of a given original message
    protected int     frag_id;         // the ID of the frag, starting with 0. E.g. 4 fragments will have IDs from 0 to 3
    protected int     num_frags;       // the total number of fragments
    protected int     original_length; // the length of the original message
    protected int     offset;          // offset of this fragment in the original message; length is in Message.getLength()
    protected boolean needs_deserialization; // true if byte[] array of a fragment needs to be de-serialized into a payload


    public Frag3Header() {
    } // used for externalization

    public Frag3Header(int id, int frag_id, int num_frags) {
        this.id=id;
        this.frag_id=frag_id;
        this.num_frags=num_frags;
    }

    public Frag3Header(int id, int frag_id, int num_frags, int original_length, int offset) {
        this.id=id;
        this.frag_id=frag_id;
        this.num_frags=num_frags;
        this.original_length=original_length;
        this.offset=offset;
    }

    public short                      getMagicId()                       {return 91;}
    public Supplier create()                           {return Frag3Header::new;}
    public boolean                    needsDeserialization()             {return needs_deserialization;}
    public Frag3Header                needsDeserialization(boolean flag) {needs_deserialization=flag; return this;}

    public String toString() {
        return String.format("[id=%d, frag-id=%d, num_frags=%d orig-length=%d, offset=%d]",
                             id, frag_id, num_frags, original_length, offset);
    }

    @Override
    public void writeTo(DataOutput out) throws IOException {
        Bits.writeIntCompressed(id, out);
        Bits.writeIntCompressed(frag_id, out);
        Bits.writeIntCompressed(num_frags, out);
        Bits.writeIntCompressed(original_length, out);
        Bits.writeIntCompressed(offset, out);
        out.writeBoolean(needs_deserialization);
    }

    @Override
    public int serializedSize() {
        return Bits.size(id) + Bits.size(frag_id) + Bits.size(num_frags) + Bits.size(original_length)
          + Bits.size(offset) + Global.BYTE_SIZE;
    }

    @Override
    public void readFrom(DataInput in) throws IOException {
        id=Bits.readIntCompressed(in);
        frag_id=Bits.readIntCompressed(in);
        num_frags=Bits.readIntCompressed(in);
        original_length=Bits.readIntCompressed(in);
        offset=Bits.readIntCompressed(in);
        needs_deserialization=in.readBoolean();
    }

}