/*
* 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;
import java.util.List;
import java.util.Set;
import org.apache.geode.distributed.internal.membership.*;
/**
* This interface specifies callback methods that are invoked when remote GemFire systems enter and
* exit the distributed cache. Note that a <code>MembershipListener</code> can be added from any VM,
* but the callback methods are always invoked in the GemFire manager VM. Thus, the callback methods
* should not perform time-consuming operations.
*
* @see DistributionManager#addMembershipListener
*/
public interface MembershipListener {
/**
* This method is invoked when a new member joins the system
*
* @param id The id of the new member that has joined the system
*/
public void memberJoined(InternalDistributedMember id);
/**
* This method is invoked after a member has explicitly left the system. It may not get invoked if
* a member becomes unreachable due to crash or network problems.
*
* @param id The id of the new member that has joined the system
* @param crashed True if member did not depart in an orderly manner.
*/
public void memberDeparted(InternalDistributedMember id, boolean crashed);
/**
* This method is invoked after the group membership service has suspected that a member is no
* longer alive, but has not yet been removed from the membership view
*
* @param id the suspected member
* @param whoSuspected the member that initiated suspect processing
* @param reason the reason the member was suspected
*/
public void memberSuspect(InternalDistributedMember id, InternalDistributedMember whoSuspected,
String reason);
/**
* This is notification that more than 50% of member weight has been lost in a single view change.
* Notification is performed before the view has been installed.
*
* @param failures members that have been lost
* @param remaining members that remain
*/
public void quorumLost(Set<InternalDistributedMember> failures,
List<InternalDistributedMember> remaining);
}