SimulationRunContext.java

package org.activiti.crystalball.simulator;

/*
 * #%L
 * simulator
 * %%
 * Copyright (C) 2012 - 2013 crystalball
 * %%
 * 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.
 * #L%
 */


import org.activiti.engine.*;
import org.activiti.engine.RuntimeService;

import java.util.Stack;

/**
 * Context in which simulation is run.
 * It contains references to process engine, event calendar.
 *
 */
public abstract class SimulationRunContext {
    
	//
	//  Process engine on which simulation will be executed
	//
	protected static ThreadLocal<Stack<ProcessEngine>> processEngineThreadLocal = new ThreadLocal<Stack<ProcessEngine>>();

    //
    // Simulation objects
    //
	protected static ThreadLocal<Stack<EventCalendar>> eventCalendarThreadLocal = new ThreadLocal<Stack<EventCalendar>>();
    
	public static RuntimeService getRuntimeService() {
		Stack<ProcessEngine> stack = getStack(processEngineThreadLocal);
		if (stack.isEmpty()) {
			return null;
		}
		return stack.peek().getRuntimeService();
	}

	public static void setProcessEngine(ProcessEngine processEngine) {
	    getStack(processEngineThreadLocal).push(processEngine);
	}

	public static void removeProcessEngine() {
	    getStack(processEngineThreadLocal).pop();
	}

	public static TaskService getTaskService() {
		Stack<ProcessEngine> stack = getStack(processEngineThreadLocal);
		if (stack.isEmpty()) {
			return null;
		}
		return stack.peek().getTaskService();
	}
	
	public static EventCalendar getEventCalendar() {
		Stack<EventCalendar> stack = getStack(eventCalendarThreadLocal);
		if (stack.isEmpty()) {
			return null;
		}
		return stack.peek();
	}

	public static void setEventCalendar(EventCalendar eventCalendar) {
	    getStack(eventCalendarThreadLocal).push(eventCalendar);
	}

	public static void removeEventCalendar() {
	    getStack(eventCalendarThreadLocal).pop();
	}

	public static HistoryService getHistoryService() {
		Stack<ProcessEngine> stack = getStack(processEngineThreadLocal);
		if (stack.isEmpty()) {
			return null;
		}
		return stack.peek().getHistoryService();
	}

	public static RepositoryService getRepositoryService() {
		Stack<ProcessEngine> stack = getStack(processEngineThreadLocal);
		if (stack.isEmpty()) {
			return null;
		}
		return stack.peek().getRepositoryService();
	}
	
	protected static <T> Stack<T> getStack(ThreadLocal<Stack<T>> threadLocal) {
		Stack<T> stack = threadLocal.get();
		if (stack == null) {
			stack = new Stack<T>();
			threadLocal.set(stack);
		}
		return stack;
	}
}