/* Copyright (c) 2009 Google Inc.
*
* 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 com.google.appengine.demos.shardedcounter.v3;
import com.google.appengine.demos.shardedcounter.PMF;
import javax.jdo.PersistenceManager;
/**
* Finds or creates a sharded counter with the desired name.
*
* @author j.s@google.com (Jeff Scudder)
*/
public class CounterFactory {
public ShardedCounter getCounter(String name) {
ShardedCounter counter = new ShardedCounter(name);
if (counter.isInDatastore()) {
return counter;
} else {
return null;
}
}
public ShardedCounter createCounter(String name) {
ShardedCounter counter = new ShardedCounter(name);
DatastoreCounter counterEntity = new DatastoreCounter(name, 0);
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
pm.makePersistent(counterEntity);
} finally {
pm.close();
}
return counter;
}
}