/* 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.v2;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
/**
* One shard belonging to the named counter.
*
* An individual shard is written to infrequently to allow the counter in
* aggregate to be incremented rapidly.
*
* @author j.s@google.com (Jeff Scudder)
*/
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class CounterShard {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private Integer shardNumber;
@Persistent
private String counterName;
@Persistent
private Integer count;
public CounterShard(String counterName, int shardNumber) {
this(counterName, shardNumber, 0);
}
public CounterShard(String counterName, int shardNumber, int count) {
this.counterName = counterName;
this.shardNumber = new Integer(shardNumber);
this.count = new Integer(count);
}
public Long getId() {
return id;
}
public String getCounterName() {
return counterName;
}
public Integer getShardNumber() {
return shardNumber;
}
public Integer getCount() {
return count;
}
public void setCount(Integer count) {
this.count = count;
}
public void increment(int amount) {
count = new Integer(count.intValue() + amount);
}
}