/*
* 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.
*/
/**
* Provide the classes necessary to create a Helix cluster manager
* <p>
* General flow
* <blockquote>
* <pre>
* manager = HelixManagerFactory.getManagerForROLE(); ROLE can be participant, spectator or a controller<br/>
* manager.connect();
* manager.addSOMEListener();
* After connect the subsequent interactions will be via listener onChange callbacks
* There will be 3 scenarios for onChange callback, which can be determined using NotificationContext.type
* INIT -> will be invoked the first time the listener is added
* CALLBACK -> will be invoked due to datachange in the property value
* FINALIZE -> will be invoked when listener is removed or session expires
*
* manager.disconnect()
* </pre>
*
* </blockquote>
*
* Default implementations available
*
* @see org.apache.helix.participant.HelixStateMachineEngine for participant
* @see RoutingTableProvider for spectator
* @see GenericHelixController for controller
*
*/
package org.apache.helix;