|
Java example source code file (MultithreadedInitializationTest.java)
This example Java source code file (MultithreadedInitializationTest.java) is included in the alvinalexander.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn
Java by Example" TM.
Learn more about this Java project at its project page.
The MultithreadedInitializationTest.java Java example source code
package org.slf4j.helpers;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.util.ArrayList;
import java.util.Collections;
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.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerAccessingThread;
import org.slf4j.LoggerFactory;
import org.slf4j.event.EventRecodingLogger;
abstract public class MultithreadedInitializationTest {
final protected static int THREAD_COUNT = 4 + Runtime.getRuntime().availableProcessors() * 2;
private final List<Logger> createdLoggers = Collections.synchronizedList(new ArrayList());
final private AtomicLong eventCount = new AtomicLong(0);
final private CyclicBarrier barrier = new CyclicBarrier(THREAD_COUNT + 1);
int diff = new Random().nextInt(10000);
@Test
public void multiThreadedInitialization() throws InterruptedException, BrokenBarrierException {
@SuppressWarnings("unused")
LoggerAccessingThread[] accessors = harness();
Logger logger = LoggerFactory.getLogger(getClass().getName());
logger.info("hello");
eventCount.getAndIncrement();
assertAllSubstLoggersAreFixed();
long recordedEventCount = getRecordedEventCount();
int LENIENCY_COUNT = 16;
long expectedEventCount = eventCount.get() + extraLogEvents();
assertTrue(expectedEventCount + " >= " + recordedEventCount, expectedEventCount >= recordedEventCount);
assertTrue(expectedEventCount + " < " + recordedEventCount + "+" + LENIENCY_COUNT, expectedEventCount < recordedEventCount + LENIENCY_COUNT);
}
abstract protected long getRecordedEventCount();
protected int extraLogEvents() {
return 0;
}
private void assertAllSubstLoggersAreFixed() {
for (Logger logger : createdLoggers) {
if (logger instanceof SubstituteLogger) {
SubstituteLogger substLogger = (SubstituteLogger) logger;
if (substLogger.delegate() instanceof EventRecodingLogger)
fail("substLogger " + substLogger.getName() + " has a delegate of type EventRecodingLogger");
}
}
}
private LoggerAccessingThread[] harness() throws InterruptedException, BrokenBarrierException {
LoggerAccessingThread[] threads = new LoggerAccessingThread[THREAD_COUNT];
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i] = new LoggerAccessingThread(barrier, createdLoggers, i, eventCount);
threads[i].start();
}
// trigger barrier
barrier.await();
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i].join();
}
return threads;
}
}
Other Java examples (source code examples)
Here is a short list of links related to this Java MultithreadedInitializationTest.java source code file:
|