/*
 * 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;


import java.io.IOException;

import org.apache.catalina.Manager;
import org.apache.catalina.tribes.io.ReplicationStream;


/**
 * The common interface used by all cluster manager.
 * This is so that we can have a more pluggable way
 * of swapping session managers for different algorithms.
 *
 * @author Peter Rossbach
 */
public interface ClusterManager extends Manager {

   /**
    * A message was received from another node, this
    * is the callback method to implement if you are interested in
    * receiving replication messages.
    * @param msg - the message received.
    */
   public void messageDataReceived(ClusterMessage msg);

   /**
    * When the request has been completed, the replication valve
    * will notify the manager, and the manager will decide whether
    * any replication is needed or not.
    * If there is a need for replication, the manager will
    * create a session message and that will be replicated.
    * The cluster determines where it gets sent.
    * @param sessionId - the sessionId that just completed.
    * @return a SessionMessage to be sent.
    */
   public ClusterMessage requestCompleted(String sessionId);

   /**
    * When the manager expires session not tied to a request.
    * The cluster will periodically ask for a list of sessions
    * that should expire and that should be sent across the wire.
    * @return String[] The invalidated sessions
    */
   public String[] getInvalidatedSessions();

   /**
    * Return the name of the manager, at host /context name and at engine hostname+/context.
    * @return String
    * @since 5.5.10
    */
   public String getName();

   /**
    * Set the name of the manager, at host /context name and at engine hostname+/context
    * @param name The manager name
    * @since 5.5.10
    */
   public void setName(String name);

   public CatalinaCluster getCluster();

   public void setCluster(CatalinaCluster cluster);

   /**
    * Open stream and use correct ClassLoader (Container), switching thread
    * context class loader.
    *
    * @param data The data
    * @return The object input stream
    * @throws IOException An error occurred
    */
   public ReplicationStream getReplicationStream(byte[] data) throws IOException;

   public ReplicationStream getReplicationStream(byte[] data, int offset, int length) throws IOException;

   public boolean isNotifyListenersOnReplication();

   public ClusterManager cloneFromTemplate();
}