/**
* 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.hadoop.yarn.event;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;
/**
* Event Dispatcher interface. It dispatches events to registered
* event handlers based on event types.
*
*/
@SuppressWarnings("rawtypes")
@Public
@Evolving
public interface Dispatcher {
// Configuration to make sure dispatcher crashes but doesn't do system-exit in
// case of errors. By default, it should be false, so that tests are not
// affected. For all daemons it should be explicitly set to true so that
// daemons can crash instead of hanging around.
public static final String DISPATCHER_EXIT_ON_ERROR_KEY =
"yarn.dispatcher.exit-on-error";
public static final boolean DEFAULT_DISPATCHER_EXIT_ON_ERROR = false;
EventHandler getEventHandler();
void register(Class<? extends Enum> eventType, EventHandler handler);
}