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Reliable cluster communication toolkit

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package org.jgroups.util;

import java.io.*;
import java.util.function.Supplier;

/**
 * Subclass of {@link UUID} accommodating additional data such as a flag. There may be many instances
 * in memory, and as they are serialized a lot and sent across the wire, I tried to make this as compact as possible.
 * @author Bela Ban
 * @since  3.5
 */
public class FlagsUUID extends UUID {
    protected int             flags;


    public FlagsUUID() {
        super();
    }

    protected FlagsUUID(byte[] data) {
        super(data);
    }

    public FlagsUUID(long mostSigBits, long leastSigBits) {
        super(mostSigBits,leastSigBits);
    }

    public  FlagsUUID(T other) {
        super(other.mostSigBits, other.leastSigBits);
        flags=other.flags;
    }

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

    public  static FlagsUUID randomUUID() {return new FlagsUUID(generateRandomBytes());}

    public static FlagsUUID randomUUID(String name) {
        FlagsUUID retval=new FlagsUUID(generateRandomBytes());
        if(name != null)
            NameCache.add(retval, name);
        return retval;
    }

    public  T setFlag(short flag) {
        flags |= flag; return (T)this;
    }

    public  T clearFlag(short flag) {
        flags &= ~flag; return (T)this;
    }

    public boolean isFlagSet(short flag) {
        return (flags & flag) == flag;
    }


    public  T addContents(T other) {
        flags|=other.flags;
        return (T)this;
    }

    @Override
    public void writeTo(DataOutput out) throws IOException {
        super.writeTo(out);
        Bits.writeIntCompressed(flags, out);
    }

    @Override
    public void readFrom(DataInput in) throws IOException {
        super.readFrom(in);
        flags=Bits.readIntCompressed(in);
    }

    /** The number of bytes required to serialize this instance */
    @Override
    public int serializedSize()     {return super.serializedSize() + Bits.size(flags);}
    public String toString() {
        return flags == 0? super.toString() : String.format("%s (flags=%d)", super.toString(), flags);
    }



}