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MultithreadedInitializationTest.java
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MultithreadedInitializationTest.java
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/**
* Copyright (c) 2004-2016 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package org.slf4j.nop;
import static org.junit.Assert.assertEquals;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.atomic.AtomicLong;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.LoggerFactoryFriend;
public class MultithreadedInitializationTest {
final static int THREAD_COUNT = 4 + Runtime.getRuntime().availableProcessors() * 2;
private static final AtomicLong EVENT_COUNT = new AtomicLong(0);
final CyclicBarrier barrier = new CyclicBarrier(THREAD_COUNT + 1);
int diff = new Random().nextInt(10000);
String loggerName = "org.slf4j.impl.MultithreadedInitializationTest";
private final PrintStream oldErr = System.err;
StringPrintStream sps = new StringPrintStream(oldErr);
@Before
public void setup() {
LoggerFactoryFriend.reset();
System.setErr(sps);
}
@After
public void tearDown() throws Exception {
LoggerFactoryFriend.reset();
System.setErr(oldErr);
}
@Test
public void multiThreadedInitialization() throws InterruptedException, BrokenBarrierException {
System.out.println("THREAD_COUNT=" + THREAD_COUNT);
LoggerAccessingThread[] accessors = harness();
for (LoggerAccessingThread accessor : accessors) {
EVENT_COUNT.getAndIncrement();
accessor.logger.info("post harness");
}
Logger logger = LoggerFactory.getLogger(loggerName + ".slowInitialization-" + diff);
logger.info("hello");
EVENT_COUNT.getAndIncrement();
assertEquals(0, sps.stringList.size());
}
private static LoggerAccessingThread[] harness() throws InterruptedException, BrokenBarrierException {
LoggerAccessingThread[] threads = new LoggerAccessingThread[THREAD_COUNT];
final CyclicBarrier barrier = new CyclicBarrier(THREAD_COUNT + 1);
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i] = new LoggerAccessingThread(barrier, i);
threads[i].start();
}
barrier.await();
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i].join();
}
return threads;
}
static class LoggerAccessingThread extends Thread {
final CyclicBarrier barrier;
Logger logger;
int count;
LoggerAccessingThread(CyclicBarrier barrier, int count) {
this.barrier = barrier;
this.count = count;
}
public void run() {
try {
barrier.await();
} catch (Exception e) {
e.printStackTrace();
}
logger = LoggerFactory.getLogger(this.getClass().getName() + "-" + count);
logger.info("in run method");
EVENT_COUNT.getAndIncrement();
}
};
public static class StringPrintStream extends PrintStream {
public static final String LINE_SEP = System.getProperty("line.separator");
PrintStream other;
List<String> stringList = new ArrayList<>();
public StringPrintStream(PrintStream ps) {
super(ps);
other = ps;
}
public void print(String s) {
other.print(s);
stringList.add(s);
}
public void println(String s) {
other.println(s);
stringList.add(s);
}
public void println(Object o) {
other.println(o);
stringList.add(o.toString());
}
};
}