org.jboss.ejb.client.remoting.ClusterNodeRemovalHandler 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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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.ejb.client.remoting;

import org.jboss.ejb.client.ClusterContext;
import org.jboss.ejb.client.EJBClientContext;
import org.jboss.ejb.client.EJBReceiverContext;
import org.jboss.logging.Logger;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * Parses a EJB remoting protocol message which corresponds to a cluster node removal message
 *
 * @author Jaikiran Pai
 */
class ClusterNodeRemovalHandler extends ProtocolMessageHandler {

    private static final Logger logger = Logger.getLogger(ClusterNodeRemovalHandler.class);

    private final ChannelAssociation channelAssociation;

    ClusterNodeRemovalHandler(final ChannelAssociation channelAssociation) {
        this.channelAssociation = channelAssociation;
    }

    @Override
    protected void processMessage(InputStream inputStream) throws IOException {
        if (inputStream == null) {
            throw new IllegalArgumentException("Cannot read from null stream");
        }
        final Map> removedNodesPerCluster = new HashMap>();
        try {
            final DataInput input = new DataInputStream(inputStream);
            // read the cluster count
            final int clusterCount = PackedInteger.readPackedInteger(input);
            for (int i = 0; i < clusterCount; i++) {
                // read the cluster name
                final String clusterName = input.readUTF();
                // read the cluster member count
                final int clusterMemberCount = PackedInteger.readPackedInteger(input);
                final Collection removedNodes = new ArrayList();
                // read the removed cluster names
                for (int j = 0; j < clusterMemberCount; j++) {
                    final String nodeName = input.readUTF();
                    removedNodes.add(nodeName);
                }
                // add ito the map of cluster topology updates
                removedNodesPerCluster.put(clusterName, removedNodes);
            }
        } finally {
            inputStream.close();
        }
        // let the client context know about the removed cluster nodes
        final EJBReceiverContext ejbReceiverContext = this.channelAssociation.getEjbReceiverContext();
        final EJBClientContext clientContext = ejbReceiverContext.getClientContext();
        for (final Map.Entry> entry : removedNodesPerCluster.entrySet()) {
            final String clusterName = entry.getKey();
            final Collection removedNodes = entry.getValue();
            if (logger.isDebugEnabled()) {
                logger.debug("Received a cluster node(s) removal message, for cluster named " + clusterName + " with "
                        + removedNodes.size() + " removed nodes " + Arrays.toString(removedNodes.toArray()));
            }
            // get a cluster context for the cluster name
            final ClusterContext clusterContext = clientContext.getClusterContext(clusterName);
            // if there's no cluster context yet (which can happen if the cluster topology hasn't yet been received)
            // then there's no point in trying to remove the cluster node
            if (clusterContext != null) {
                for (final String nodeName : removedNodes) {
                    clusterContext.removeClusterNode(nodeName);
                }
            }
        }
    }
}