/*
* Copyright 2013 the original author or authors.
*
* Licensed 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.springframework.yarn.am.monitor;
import org.springframework.yarn.listener.ContainerMonitorListener;
/**
* General interface for components able to monitor application
* and container statuses.
*
* @author Janne Valkealahti
*
*/
public interface ContainerMonitor {
/**
* Gets a count of free containers.
*
* @return count of free containers
*/
int freeCount();
/**
* Gets a count of running containers.
*
* @return count of running containers
*/
int runningCount();
/**
* Gets a count of failed containers.
*
* @return count of failed containers
*/
int failedCount();
/**
* Gets a count of completed containers.
*
* @return count of completed containers
*/
int completedCount();
/**
* Adds the container monitor state listener.
*
* @param listener the {@link ContainerMonitorListener}
*/
void addContainerMonitorStateListener(ContainerMonitorListener listener);
}