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Testing utilities for AGRESTE-based applications

There is a newer version: 6.0.0

/*
 * Copyright 2016 Agapsys Tecnologia Ltda-ME.
 *
 * 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.agapsys.agreste.test;

import com.agapsys.agreste.JpaTransaction;
import java.util.LinkedList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;

public class MockedTransaction implements JpaTransaction {
	private final List commitQueue = new LinkedList<>();
	private final List rollbackQueue = new LinkedList<>();

	private EntityManager em;
	private EntityTransaction et;

	public MockedTransaction(EntityManager em) {
		this.em = em;
		this.et = em.getTransaction();

		if (!this.et.isActive())
			this.et.begin();
	}

	@Override
	public EntityManager getEntityManager() {
		return em;
	}

	@Override
	public void invokeAfterCommit(Runnable runnable) {
		if (runnable == null) throw new IllegalArgumentException("Null runnable");
		commitQueue.add(runnable);
	}

	@Override
	public void invokeAfterRollback(Runnable runnable) {
		if (runnable == null) throw new IllegalArgumentException("Null runnable");
		rollbackQueue.add(runnable);
	}

	private void close(boolean commit) {
		if (commit) {
			et.commit();
		} else {
			et.rollback();
		}

		et = em.getTransaction();
	}

	private void processQueue(List queue) {
		for (Runnable runnable : queue) {
			runnable.run();
		}

		queue.clear();
	}

	public void begin() {
		if (!et.isActive())
			et.begin();
	}

	public void rollback() {
		close(false);
		processQueue(rollbackQueue);
	}

	public void commit() {
		close(true);
		processQueue(commitQueue);
	}
}