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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.util;

import java.util.Objects;

/**
 * Class that represents a response from a communication
 */
public class Rsp {
    /** Flag that represents whether the response was received */
    protected static final byte RECEIVED     = 1;

    /** Flag that represents whether the sender of the response was suspected */
    protected static final byte SUSPECTED    = 1 << 1;

    /** If true, the sender (below) could not be reached, e.g. if a site was down (only used by RELAY2) */
    protected static final byte UNREACHABLE  = 1 << 2;

    /** Set when the value is an exception */
    protected static final byte IS_EXCEPTION = 1 << 3;

    protected byte          flags;

    /** The value from the response (or the exception) */
    protected Object        value; // untyped, to be able to hold both T and Throwable

    public Rsp() {}

    public Rsp(T retval) {
        setValue(retval);
    }

    public Rsp(Throwable t) {
        setException(t);
    }

    public void readIn(Rsp other) {
        this.flags = other.flags;
        this.value = other.value;
    }

    public T getValue() {
        return hasException()? null : (T)value;
    }

    public Rsp setValue(T val) {
        this.value=val;
        setReceived();
        this.flags=Util.clearFlags(flags, IS_EXCEPTION); // clear the exception flag just in case it is set
        return this;
    }

    public boolean hasException() {
        return Util.isFlagSet(flags, IS_EXCEPTION);
    }

    public Throwable getException() {
        return hasException()? (Throwable)value : null;
    }

    public Rsp setException(Throwable t) {
        if(t != null) {
            this.value=t;
            setReceived();
            this.flags=Util.setFlag(flags, IS_EXCEPTION);
        }
        return this;
    }


    public boolean wasReceived() {
        return Util.isFlagSet(flags, RECEIVED);
    }

    public Rsp setReceived() {
        this.flags=Util.setFlag(flags, RECEIVED);
        return this;
    }

    public boolean wasSuspected() {
        return Util.isFlagSet(flags, SUSPECTED);
    }

    public boolean setSuspected() {
        boolean changed=!wasSuspected();
        this.flags=Util.setFlag(flags, SUSPECTED);
        return changed;
    }

    public boolean wasUnreachable() {
        return Util.isFlagSet(flags, UNREACHABLE);
    }

    public boolean setUnreachable() {
        boolean changed=!wasUnreachable();
        this.flags=Util.setFlag(flags, UNREACHABLE);
        return changed;
    }

    public int hashCode() {
        return value != null? value.hashCode() : 0;
    }

    public boolean equals(Object obj) {
        Rsp other=(Rsp)obj;
        return Objects.equals(value, other.value);
    }

    public String toString() {
        StringBuilder sb=new StringBuilder();
        if(value != null) {
            if(!hasException())
                sb.append("value=").append(value);
            else
                sb.append("exception=").append(getException());
            sb.append(", ");
        }
        sb.append("received=").append(wasReceived()).append(", suspected=").append(wasSuspected());
        if(wasUnreachable())
            sb.append(" (unreachable)");
        return sb.toString();
    }
}