org.jgroups.protocols.pbcast.JoinRsp 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.pbcast;


import org.jgroups.Constructable;
import org.jgroups.Global;
import org.jgroups.View;
import org.jgroups.util.Digest;
import org.jgroups.util.SizeStreamable;

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


/**
 * Result of a JOIN request (sent by the GMS client). Instances of this class are immutable.
 */
public class JoinRsp implements SizeStreamable, Constructable {
    protected View    view;
    protected Digest  digest;
    protected String  fail_reason; /** only set if JOIN failed, e.g. in AUTH */

    protected static final byte VIEW_PRESENT        = 1 << 0;
    protected static final byte DIGEST_PRESENT      = 1 << 1;
    protected static final byte FAIL_REASON_PRESENT = 1 << 2;


    public JoinRsp() {
    }

    public JoinRsp(View v, Digest d) {
        view=v;
        digest=d;
    }

    public JoinRsp(String fail_reason) {this.fail_reason=fail_reason;}

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

    public View    getView()               {return view;}
    public Digest  getDigest()             {return digest;}
    public String  getFailReason()         {return fail_reason;}
    public JoinRsp setFailReason(String r) {fail_reason=r; return this;}

    @Override
    public void writeTo(DataOutput out) throws IOException {
        byte flags=0;
        if(view != null)
            flags|=VIEW_PRESENT;
        if(digest != null)
            flags|=DIGEST_PRESENT;
        if(fail_reason != null)
            flags|=FAIL_REASON_PRESENT;
        out.writeByte(flags);

        // 1. view
        if(view != null)
            view.writeTo(out);

        // 2. digest
        if(digest != null)
            digest.writeTo(out, false); // don't write the membership; it is already present in the view

        // 3. fail_reason
        if(fail_reason != null)
            out.writeUTF(fail_reason);
    }

    @Override
    public void readFrom(DataInput in) throws IOException, ClassNotFoundException {
        byte flags=in.readByte();

        // 1. view
        if((flags & VIEW_PRESENT) == VIEW_PRESENT) {
            view=new View();
            view.readFrom(in);
        }

        // 2. digest
        if((flags & DIGEST_PRESENT) == DIGEST_PRESENT) {
            digest=new Digest(view.getMembersRaw());
            digest.readFrom(in, false);
        }

        // 3. fail_reason
        if((flags & FAIL_REASON_PRESENT) == FAIL_REASON_PRESENT)
            fail_reason=in.readUTF();
    }

    @Override
    public int serializedSize() {
        int retval=Global.BYTE_SIZE; // flags

        if(view != null)
            retval+=view.serializedSize();

        if(digest != null)
            retval+=digest.serializedSize(false);

        if(fail_reason != null)
            retval+=fail_reason.length() +2;
        return retval;
    }

    public String toString() {
        StringBuilder sb=new StringBuilder();
        if(view != null)
            sb.append("view: ").append(view);
        if(digest != null)
            sb.append(", digest: ").append(digest);
        if(fail_reason != null)
            sb.append("fail reason: ").append(fail_reason);
        return sb.toString();
    }
}