/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb.generator;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Generates a sequence of integers 0, 1, ...
*/
public class CounterGenerator extends IntegerGenerator
{
final AtomicInteger counter;
/**
* Create a counter that starts at countstart
*/
public CounterGenerator(int countstart)
{
counter=new AtomicInteger(countstart);
setLastInt(counter.get()-1);
}
/**
* If the generator returns numeric (integer) values, return the next value as an int. Default is to return -1, which
* is appropriate for generators that do not return numeric values.
*/
public int nextInt()
{
int ret = counter.getAndIncrement();
setLastInt(ret);
return ret;
}
@Override
public int lastInt()
{
return counter.get() - 1;
}
@Override
public double mean() {
throw new UnsupportedOperationException("Can't compute mean of non-stationary distribution!");
}
}