Manager.java example

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/*
 * 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.geode.distributed.internal.membership.gms.interfaces;

import java.io.NotSerializableException;
import java.util.Collection;
import java.util.Set;

import org.apache.geode.distributed.DistributedMember;
import org.apache.geode.distributed.internal.DistributionMessage;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.distributed.internal.membership.NetMember;
import org.apache.geode.distributed.internal.membership.NetView;
import org.apache.geode.distributed.internal.membership.gms.SuspectMember;

/**
 * Manager presents the GMS services to the outside world and handles startup/shutdown race
 * conditions. It is also the default MessageHandler
 */
public interface Manager extends Service, MessageHandler {

  /**
   * After all services have been started this is used to join the distributed system
   */
  void joinDistributedSystem();

  /**
   * Sends a message using a selected distribution channel (e.g. Messenger or DirectChannel)
   * 
   * @return a set of recipients that did not receive the message
   */
  Set<InternalDistributedMember> send(DistributionMessage m) throws NotSerializableException;

  /**
   * initiates a Forced Disconnect, shutting down the distributed system and closing the cache
   * 
   * @param reason
   */
  void forceDisconnect(String reason);

  /**
   * notifies the manager that membership quorum has been lost
   */
  void quorumLost(Collection<InternalDistributedMember> failures, NetView view);

  /**
   * Notifies the manager that a member has contacted us who is not in the current membership view
   * 
   * @param mbr
   * @param birthTime
   */
  void addSurpriseMemberForTesting(DistributedMember mbr, long birthTime);

  /**
   * Tests to see if the given member has been put into "shunned" state, meaning that it has left
   * the distributed system and we should no longer process requests from it. Shunned status
   * eventually times out.
   * 
   * @param mbr
   * @return true if the member is shunned
   */
  boolean isShunned(DistributedMember mbr);

  /**
   * returns the lead member from the current membership view. This is typically the oldest member
   * that is not an Admin or Locator member.
   * 
   * @return the ID of the lead member
   */
  DistributedMember getLeadMember();

  /**
   * returns the coordinator of the current membership view. This is who created and distributed the
   * view. See NetView.
   */
  DistributedMember getCoordinator();

  /**
   * sometimes we cannot perform multicast messaging, such as during a rolling upgrade.
   * 
   * @return true if multicast messaging can be performed
   */
  boolean isMulticastAllowed();

  /**
   * Returns the reason for a shutdown.
   */
  Throwable getShutdownCause();

  /**
   * Returns true if a shutdown is in progress or has been completed
   */
  boolean shutdownInProgress();

  // /**
  // * similar to forceDisconnect but is used solely by Messenger
  // * to tell Manager that communications have been lost
  // */
  // void membershipFailure(String message, Exception cause);

  /**
   * Indicate whether we are attempting a reconnect
   */
  boolean isReconnectingDS();

}