package org.apache.helix.manager.zk;
/*
* 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.
*/
import java.util.List;
import org.I0Itec.zkclient.exception.ZkInterruptedException;
import org.apache.helix.HelixManager;
import org.apache.helix.HelixTimerTask;
import org.apache.helix.PropertyKey;
import org.apache.helix.controller.GenericHelixController;
import org.apache.helix.messaging.DefaultMessagingService;
import org.apache.helix.messaging.handling.MessageHandlerFactory;
import org.apache.helix.model.HelixConfigScope.ConfigScopeProperty;
import org.apache.log4j.Logger;
/**
* helper class for controller manager
*/
public class ControllerManagerHelper {
private static Logger LOG = Logger.getLogger(ControllerManagerHelper.class);
final HelixManager _manager;
final DefaultMessagingService _messagingService;
final List<HelixTimerTask> _controllerTimerTasks;
public ControllerManagerHelper(HelixManager manager, List<HelixTimerTask> controllerTimerTasks) {
_manager = manager;
_messagingService = (DefaultMessagingService) manager.getMessagingService();
_controllerTimerTasks = controllerTimerTasks;
}
public void addListenersToController(GenericHelixController controller) {
try {
/**
* setup controller message listener and register message handlers
*/
_manager.addControllerMessageListener(_messagingService.getExecutor());
MessageHandlerFactory defaultControllerMsgHandlerFactory =
new DefaultControllerMessageHandlerFactory();
_messagingService.getExecutor().registerMessageHandlerFactory(
defaultControllerMsgHandlerFactory.getMessageType(), defaultControllerMsgHandlerFactory);
MessageHandlerFactory defaultSchedulerMsgHandlerFactory =
new DefaultSchedulerMessageHandlerFactory(_manager);
_messagingService.getExecutor().registerMessageHandlerFactory(
defaultSchedulerMsgHandlerFactory.getMessageType(), defaultSchedulerMsgHandlerFactory);
MessageHandlerFactory defaultParticipantErrorMessageHandlerFactory =
new DefaultParticipantErrorMessageHandlerFactory(_manager);
_messagingService.getExecutor().registerMessageHandlerFactory(
defaultParticipantErrorMessageHandlerFactory.getMessageType(),
defaultParticipantErrorMessageHandlerFactory);
/**
* setup generic-controller
*/
_manager.addInstanceConfigChangeListener(controller);
_manager.addConfigChangeListener(controller, ConfigScopeProperty.RESOURCE);
_manager.addConfigChangeListener(controller, ConfigScopeProperty.CONSTRAINT);
_manager.addLiveInstanceChangeListener(controller);
_manager.addIdealStateChangeListener(controller);
// no need for controller to listen on external-view
// _manager.addExternalViewChangeListener(controller);
_manager.addControllerListener(controller);
} catch (ZkInterruptedException e) {
LOG.warn("zk connection is interrupted during HelixManagerMain.addListenersToController(). "
+ e);
} catch (Exception e) {
LOG.error("Error when creating HelixManagerContollerMonitor", e);
}
}
public void removeListenersFromController(GenericHelixController controller) {
PropertyKey.Builder keyBuilder = new PropertyKey.Builder(_manager.getClusterName());
/**
* reset generic-controller
*/
_manager.removeListener(keyBuilder.instanceConfigs(), controller);
_manager.removeListener(keyBuilder.resourceConfigs(), controller);
_manager.removeListener(keyBuilder.constraints(), controller);
_manager.removeListener(keyBuilder.liveInstances(), controller);
_manager.removeListener(keyBuilder.idealStates(), controller);
_manager.removeListener(keyBuilder.controller(), controller);
/**
* reset controller message listener and unregister all message handlers
*/
_manager.removeListener(keyBuilder.controllerMessages(), _messagingService.getExecutor());
}
public void startControllerTimerTasks() {
for (HelixTimerTask task : _controllerTimerTasks) {
task.start();
}
}
public void stopControllerTimerTasks() {
for (HelixTimerTask task : _controllerTimerTasks) {
task.stop();
}
}
}