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// Copyright 2015 Google 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.
package com.google.devtools.build.lib.shell;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Tests {@link Command} execution under load.
*/
@RunWith(JUnit4.class)
public class LoadTest {
private File tempFile;
@Before
public void setUp() throws IOException {
// enable all log statements to ensure there are no problems with
// logging code
Logger.getLogger("com.google.devtools.build.lib.shell.Command").setLevel(Level.FINEST);
// create a temp file
tempFile = File.createTempFile("LoadTest", "txt");
if (tempFile.exists()) {
tempFile.delete();
}
tempFile.deleteOnExit();
// write some random numbers to the file
try (final PrintWriter out = new PrintWriter(new FileWriter(tempFile))) {
final Random r = new Random();
for (int i = 0; i < 100; i++) {
out.println(String.valueOf(r.nextDouble()));
}
}
}
@After
public void tearDown() throws Exception {
tempFile.delete();
}
@Test
public void testLoad() throws Throwable {
final Command command = new Command(new String[] {"/bin/cat",
tempFile.getAbsolutePath()});
Thread[] threads = new Thread[10];
List<Throwable> exceptions = Collections.synchronizedList(new ArrayList<Throwable>());
for (int i = 0; i < threads.length; i++) {
threads[i] = new Thread(new LoadThread(command, exceptions));
}
for (int i = 0; i < threads.length; i++) {
threads[i].start();
}
for (int i = 0; i < threads.length; i++) {
threads[i].join();
}
if (!exceptions.isEmpty()) {
for (Throwable t : exceptions) {
t.printStackTrace();
}
throw exceptions.get(0);
}
}
private static final class LoadThread implements Runnable {
private final Command command;
private final List<Throwable> exception;
private LoadThread(Command command, List<Throwable> exception) {
this.command = command;
this.exception = exception;
}
@Override
public void run() {
try {
for (int i = 0; i < 20; i++) {
command.execute();
}
} catch (Throwable t) {
exception.add(t);
}
}
}
}
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