/**
* 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.ambari.server.controller.utilities;
import java.util.Map;
import org.apache.ambari.server.controller.utilities.state.DefaultServiceCalculatedState;
import org.apache.ambari.server.controller.utilities.state.FlumeServiceCalculatedState;
import org.apache.ambari.server.controller.utilities.state.HBaseServiceCalculatedState;
import org.apache.ambari.server.controller.utilities.state.HDFSServiceCalculatedState;
import org.apache.ambari.server.controller.utilities.state.HiveServiceCalculatedState;
import org.apache.ambari.server.controller.utilities.state.OozieServiceCalculatedState;
import org.apache.ambari.server.controller.utilities.state.ServiceCalculatedState;
import org.apache.ambari.server.controller.utilities.state.YARNServiceCalculatedState;
import org.apache.ambari.server.state.Service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.sf.ehcache.util.concurrent.ConcurrentHashMap;
public class ServiceCalculatedStateFactory {
private final static ServiceCalculatedState DEFAULT_SERVICE_CALCULATED_STATE = new DefaultServiceCalculatedState();
private final static Logger LOG = LoggerFactory.getLogger(ServiceCalculatedStateFactory.class);
// cache for the service calculated state objects
private final static Map<Service.Type, ServiceCalculatedState> serviceStateProviders = new ConcurrentHashMap<>();
public static ServiceCalculatedState getServiceStateProvider(String service){
ServiceCalculatedState suggestedServiceProvider;
Service.Type serviceType = null;
try {
serviceType = Service.Type.valueOf(service);
} catch (Exception e){
LOG.debug(String.format("Could not parse service name \"%s\", will use default state provider", service));
}
if (serviceType == null) { // service is unknown, return default service state provider
return DEFAULT_SERVICE_CALCULATED_STATE;
}
if (serviceStateProviders.containsKey(serviceType)) { // use cache on hit
suggestedServiceProvider = serviceStateProviders.get(serviceType);
} else {
switch (serviceType) {
case HDFS:
suggestedServiceProvider = new HDFSServiceCalculatedState();
break;
case FLUME:
suggestedServiceProvider = new FlumeServiceCalculatedState();
break;
case OOZIE:
suggestedServiceProvider = new OozieServiceCalculatedState();
break;
case YARN:
suggestedServiceProvider = new YARNServiceCalculatedState();
break;
case HIVE:
suggestedServiceProvider = new HiveServiceCalculatedState();
break;
case HBASE:
suggestedServiceProvider = new HBaseServiceCalculatedState();
break;
default:
suggestedServiceProvider = DEFAULT_SERVICE_CALCULATED_STATE;
break;
}
// lazy cache initialization, create just required objects
serviceStateProviders.put(serviceType, suggestedServiceProvider);
}
return suggestedServiceProvider;
}
}