/**
* 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.tez.mapreduce.client;
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.JobID;
public class ClientCache {
private final Configuration conf;
private final ResourceMgrDelegate rm;
private Map<JobID, ClientServiceDelegate> cache =
new HashMap<JobID, ClientServiceDelegate>();
public ClientCache(Configuration conf, ResourceMgrDelegate rm) {
this.conf = conf;
this.rm = rm;
}
//TODO: evict from the cache on some threshold
public synchronized ClientServiceDelegate getClient(JobID jobId) {
ClientServiceDelegate client = cache.get(jobId);
if (client == null) {
client = new ClientServiceDelegate(conf, rm, jobId);
cache.put(jobId, client);
}
return client;
}
}