package org.activiti.crystalball.simulator;
/* 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.
*/
import java.util.Random;
/**
* Simulation utils used in the simulation run and scenario.
* e.g. random number generator should be centralized for all sim runs.
*
* @author martin.grofcik
*/
public class SimUtils {
/** main random number generator */
private volatile static ThreadLocal<Random> randomGenerator = new ThreadLocal<Random>();
public static void setSeed(long seed) {
randomGenerator.set( new Random(seed));
}
public static int getRandomInt(int max) {
if (randomGenerator.get() == null ) {
randomGenerator.set( new Random());
}
return randomGenerator.get().nextInt(max);
}
}