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Kripton Arch Test Support Library

There is a newer version: 8.2.0-rc.4

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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.abubusoft.kripton.android.executor;

import java.util.List;

import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.MultipleFailureException;
import org.junit.runners.model.Statement;

/**
 * A JUnit rule that swaps the task executor with a more controllable one. Once
 * we have the TaskExecutor API, we should consider making this public (via some
 * test package).
 *
 * @hide
 */
public class JunitKriptonTaskExecutorRule implements TestRule {
	private final KriptonTaskExecutorWithFakeMainThread mTaskExecutor;

	public JunitKriptonTaskExecutorRule(int ioThreadCount, boolean spyOnExecutor) {
		mTaskExecutor = new KriptonTaskExecutorWithFakeMainThread(ioThreadCount);

	}

	private void beforeStart() {
		KriptonTaskExecutor.getInstance().setDelegate(mTaskExecutor);
	}

	private void afterFinished() {
		KriptonTaskExecutor.getInstance().setDelegate(null);
	}

	public TaskExecutor getTaskExecutor() {
		return mTaskExecutor;
	}

	/**
	 * Awaits while all currently posted tasks will be finished
	 *
	 * @param seconds
	 *            timeout in seconds
	 */
	public void drainTasks(int seconds) throws InterruptedException {
		mTaskExecutor.drainTasks(seconds);
	}

	@Override
	public Statement apply(final Statement base, Description description) {
		return new Statement() {
			@Override
			public void evaluate() throws Throwable {
				beforeStart();
				try {
					base.evaluate();
					finishExecutors();
				} catch (Throwable t) {
					throw new RuntimeException(t);
				} finally {
					afterFinished();
				}
			}
		};
	}

	private void finishExecutors() throws InterruptedException, MultipleFailureException {
		mTaskExecutor.shutdown(10);
		final List errors = mTaskExecutor.getErrors();
		if (!errors.isEmpty()) {
			throw new MultipleFailureException(errors);
		}
	}
}