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TestUtil.java
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116 lines (97 loc) · 3.38 KB
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/**
* Copyright 2014 Netflix, Inc.
*
* 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 rx;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import com.pushtorefresh.private_constructor_checker.PrivateConstructorChecker;
import rx.Scheduler.Worker;
import rx.exceptions.Exceptions;
import rx.functions.Action0;
import rx.schedulers.Schedulers;
/**
* Common test utility methods.
*/
public enum TestUtil {
;
/**
* Verifies that the given class has a private constructor that
* throws IllegalStateException("No instances!") upon instantiation.
* @param clazz the target class to check
*/
public static void checkUtilityClass(Class<?> clazz) {
PrivateConstructorChecker
.forClass(clazz)
.expectedTypeOfException(IllegalStateException.class)
.expectedExceptionMessage("No instances!")
.check();
}
/**
* Runs two actions concurrently, one in the current thread and the other on
* the IO scheduler, synchronizing their execution as much as possible; rethrowing
* any exceptions they produce.
* <p>This helper waits until both actions have run or times out in 5 seconds.
* @param r1 the first action
* @param r2 the second action
*/
public static void race(Action0 r1, final Action0 r2) {
final AtomicInteger counter = new AtomicInteger(2);
final Throwable[] errors = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
Worker w = Schedulers.io().createWorker();
try {
w.schedule(new Action0() {
@Override
public void call() {
if (counter.decrementAndGet() != 0) {
while (counter.get() != 0);
}
try {
r2.call();
} catch (Throwable ex) {
errors[1] = ex;
}
cdl.countDown();
}
});
if (counter.decrementAndGet() != 0) {
while (counter.get() != 0);
}
try {
r1.call();
} catch (Throwable ex) {
errors[0] = ex;
}
List<Throwable> errorList = new ArrayList<Throwable>();
try {
if (!cdl.await(5, TimeUnit.SECONDS)) {
errorList.add(new TimeoutException());
}
} catch (InterruptedException ex) {
errorList.add(ex);
}
if (errors[0] != null) {
errorList.add(errors[0]);
}
if (errors[1] != null) {
errorList.add(errors[1]);
}
Exceptions.throwIfAny(errorList);
} finally {
w.unsubscribe();
}
}
}