org.jboss.ejb.client.remoting.ClusterRemovalMessageHandler Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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.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.Arrays;
import java.util.Collection;
import java.util.HashSet;

/**
 * Parses the EJB remoting protocol messages, sent from the server, contain the cluster removal notifications
 *
 * @author Jaikiran Pai
 */
class ClusterRemovalMessageHandler extends ProtocolMessageHandler {

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

    private final EJBReceiverContext ejbReceiverContext;

    ClusterRemovalMessageHandler(final EJBReceiverContext ejbReceiverContext) {
        this.ejbReceiverContext = ejbReceiverContext;
    }

    @Override
    protected void processMessage(final InputStream inputStream) throws IOException {
        if (inputStream == null) {
            throw new IllegalArgumentException("Cannot read from a null stream");
        }
        final Collection removedClusters = new HashSet();
        try {
            final DataInput input = new DataInputStream(inputStream);
            // read the cluster count
            final int clusterCount = PackedInteger.readPackedInteger(input);
            // for each of the clusters, read the cluster name
            for (int i = 0; i < clusterCount; i++) {
                final String clusterName = input.readUTF();
                // add it to the removed clusters
                removedClusters.add(clusterName);
            }
        } finally {
            inputStream.close();
        }
        // let the client context know that about the removed clusters
        final EJBClientContext clientContext = this.ejbReceiverContext.getClientContext();
        if (logger.isDebugEnabled()) {
            logger.debug("Received a cluster removal message for " + removedClusters.size() + " clusters "
                    + Arrays.toString(removedClusters.toArray()));
        }
        for (final String clusterName : removedClusters) {
            // remove the cluster from the client context
            clientContext.removeCluster(clusterName);
        }
    }
}