package io.thekraken.grok.api;
import static org.junit.Assert.assertEquals;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import oi.thekraken.grok.api.Match;
import static org.hamcrest.core.IsEqual.*;
import static org.hamcrest.core.IsNot.*;
import org.junit.Assert;
import org.junit.Test;
public class ConcurrencyTest {
/**
* We will test this by setting up two threads, asserting on the hash values
* the instances generate for each thread
* @throws InterruptedException
* @throws ExecutionException
*/
@Test
public void test_001_concurrent_match() throws InterruptedException, ExecutionException {
// Setup callable method that reports the hashcode for the thread
int threadCount = 2;
Callable<Integer> task = new Callable<Integer>() {
@Override
public Integer call() {
return Match.getInstance().hashCode();
}
};
// Create n tasks to execute
List<Callable<Integer>> tasks = Collections.nCopies(threadCount, task);
// Execute the task for both tasks
ExecutorService es = Executors.newFixedThreadPool(threadCount);
List<Future<Integer>> futures = es.invokeAll(tasks);
int hash1 = futures.get(0).get();
int hash2 = futures.get(1).get();
// The two hashcodes must NOT be equal
Assert.assertThat(hash1, not(equalTo(hash2)));
}
@Test
public void test_002_match_within_instance() {
// Verify that the instances are equal for the same thread
Match m1 = Match.getInstance();
Match m2 = Match.getInstance();
assertEquals(m1, m2);
}
}