/**
* 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.falcon.workflow.engine;
import org.apache.falcon.FalconException;
import org.apache.falcon.entity.ClusterHelper;
import org.apache.falcon.entity.store.ConfigurationStore;
import org.apache.falcon.entity.v0.EntityType;
import org.apache.falcon.entity.v0.cluster.Cluster;
import org.apache.log4j.Logger;
import org.apache.oozie.client.ProxyOozieClient;
import java.util.concurrent.ConcurrentHashMap;
/**
* Factory for providing appropriate oozie client.
*/
public final class OozieClientFactory {
private static final Logger LOG = Logger.getLogger(OozieClientFactory.class);
private static final String LOCAL_OOZIE = "local";
private static final ConcurrentHashMap<String, ProxyOozieClient> CACHE =
new ConcurrentHashMap<String, ProxyOozieClient>();
private static volatile boolean localInitialized = false;
private OozieClientFactory() {}
public static synchronized ProxyOozieClient get(Cluster cluster)
throws FalconException {
assert cluster != null : "Cluster cant be null";
String oozieUrl = ClusterHelper.getOozieUrl(cluster);
if (!CACHE.containsKey(oozieUrl)) {
ProxyOozieClient ref = getClientRef(oozieUrl);
LOG.info("Caching Oozie client object for " + oozieUrl);
CACHE.putIfAbsent(oozieUrl, ref);
}
return CACHE.get(oozieUrl);
}
public static ProxyOozieClient get(String clusterName) throws FalconException {
return get((Cluster) ConfigurationStore.get().get(EntityType.CLUSTER, clusterName));
}
private static ProxyOozieClient getClientRef(String oozieUrl)
throws FalconException {
if (LOCAL_OOZIE.equals(oozieUrl)) {
return getLocalOozieClient();
} else {
return new ProxyOozieClient(oozieUrl);
}
}
private static ProxyOozieClient getLocalOozieClient() throws FalconException {
try {
if (!localInitialized) {
//LocalOozie.start();
localInitialized = true;
}
//return LocalOozie.getClient();
return null;
} catch (Exception e) {
throw new FalconException(e);
}
}
}