bundles/org.apache.tomcat/src/org/apache/catalina/ha/session/ClusterManagerBase.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.ha.session;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.apache.catalina.Container;
import org.apache.catalina.Loader;
import org.apache.catalina.ha.ClusterManager;
import org.apache.catalina.session.ManagerBase;
import org.apache.catalina.tribes.io.ReplicationStream;

/**
 * 
 * @author Filip Hanik
 * @version $Id: ClusterManagerBase.java,v 1.1 2011/06/28 21:08:17 rherrmann Exp $
 */

public abstract class ClusterManagerBase extends ManagerBase
        implements ClusterManager {

    public static ClassLoader[] getClassLoaders(Container container) {
        Loader loader = null;
        ClassLoader classLoader = null;
        if (container != null) loader = container.getLoader();
        if (loader != null) classLoader = loader.getClassLoader();
        else classLoader = Thread.currentThread().getContextClassLoader();
        if ( classLoader == Thread.currentThread().getContextClassLoader() ) {
            return new ClassLoader[] {classLoader};
        } else {
            return new ClassLoader[] {classLoader,Thread.currentThread().getContextClassLoader()};
        }
    }


    public ClassLoader[] getClassLoaders() {
        return getClassLoaders(container);
    }

    /**
     * Open Stream and use correct ClassLoader (Container) Switch
     * ThreadClassLoader
     * 
     * @param data
     * @return The object input stream
     * @throws IOException
     */
    @Override
    public ReplicationStream getReplicationStream(byte[] data) throws IOException {
        return getReplicationStream(data,0,data.length);
    }

    @Override
    public ReplicationStream getReplicationStream(byte[] data, int offset, int length) throws IOException {
        ByteArrayInputStream fis = new ByteArrayInputStream(data, offset, length);
        return new ReplicationStream(fis, getClassLoaders());
    }    


    //  ---------------------------------------------------- persistence handler

    /**
     * {@link org.apache.catalina.Manager} implementations that also implement
     * {@link ClusterManager} do not support local session persistence.
     */
    @Override
    public void load() {
        // NOOP 
    }

    @Override
    public void unload() {
        // NOOP
    }
}