org.jgroups.protocols.pbcast.ServerGmsImpl 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.Address;
import org.jgroups.View;
import org.jgroups.util.Digest;
import org.jgroups.util.MergeId;

import java.util.Collection;
import java.util.Map;
import java.util.Objects;

/**
 * Common super class for CoordGmsImpl and ParticipantGmsImpl
 * @author Bela Ban
 */
public abstract class ServerGmsImpl extends GmsImpl {


    protected ServerGmsImpl(GMS gms) {
        super(gms);
    }

    public void init() throws Exception {
        super.init();
        gms.getViewHandler().resume();
    }

    /**
     * Invoked upon receiving a MERGE event from the MERGE layer. Starts the merge protocol.
     * See description of protocol in DESIGN.
     * @param views A List of different views detected by the merge protocol
     */
    public void merge(Map views) {
        merger.merge(views);
    }


    /**
     * Get the view and digest and send back both (MergeData) in the form of a MERGE_RSP to the sender.
     * If a merge is already in progress, send back a MergeData with the merge_rejected field set to true.
     * @param sender The address of the merge leader
     * @param merge_id The merge ID
     * @param mbrs The set of members from which we expect responses
     */
    public void handleMergeRequest(Address sender, MergeId merge_id, Collection mbrs) {
        merger.handleMergeRequest(sender, merge_id, mbrs);
    }

    public void handleMergeResponse(MergeData data, MergeId merge_id) {
        merger.handleMergeResponse(data, merge_id);
    }

    public void handleMergeCancelled(MergeId merge_id) {
        merger.handleMergeCancelled(merge_id);
    }

    /**
     * Called by the GMS when a VIEW is received.
     * @param view The view to be installed
     * @param digest   If view is a MergeView, the digest contains the seqnos of all members and has to be set by GMS
     */
    public void handleViewChange(View view, Digest digest) {
        if(gms.isLeaving() && !view.containsMember(gms.getAddress()))
            return;
        View prev_view=gms.view();
        gms.installView(view, digest);
        Address prev_coord=prev_view != null? prev_view.getCoord() : null, curr_coord=view.getCoord();
        if(!Objects.equals(curr_coord, prev_coord))
            coordChanged(prev_coord, curr_coord);
    }

    public void handleMergeView(final MergeData data,final MergeId merge_id) {
        merger.handleMergeView(data, merge_id);
    }

    public void handleDigestResponse(Address sender, Digest digest) {
        merger.handleDigestResponse(sender, digest);
    }

    protected void coordChanged(Address from, Address to) {}
}