slider-core/src/main/java/org/apache/slider/server/appmaster/management/YarnServiceHealthCheck.java

/*
 * 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.slider.server.appmaster.management;

import com.codahale.metrics.health.HealthCheck;
import org.apache.hadoop.service.Service;

public class YarnServiceHealthCheck extends HealthCheck {
  
  private final Service service;

  public YarnServiceHealthCheck(Service service) {
    this.service = service;
  }

  @Override
  protected Result check() throws Exception {
    return service.isInState(Service.STATE.STARTED)
           ? Result.healthy()
           : Result.unhealthy("Service is not running: %s", service);
  }
}