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148 changes: 148 additions & 0 deletions
148
presto-common/src/test/java/com/facebook/presto/common/TestUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| /* | ||
| * 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.facebook.presto.common; | ||
|
|
||
| import org.testng.annotations.Test; | ||
|
|
||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.TimeoutException; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
| import java.util.function.Function; | ||
| import java.util.function.Supplier; | ||
|
|
||
| import static org.testng.Assert.assertEquals; | ||
| import static org.testng.Assert.assertSame; | ||
| import static org.testng.Assert.fail; | ||
|
|
||
| public class TestUtils | ||
| { | ||
| @Test | ||
| public void testCheckArgumentFailWithMessage() | ||
| { | ||
| try { | ||
| Utils.checkArgument(false, "test %s", "test"); | ||
| fail(); | ||
| } | ||
| catch (IllegalArgumentException e) { | ||
| assertEquals(e.getMessage(), "test test"); | ||
| } | ||
| } | ||
|
|
||
| @Test | ||
| public void testCheckArgumentPassWithMessage() | ||
| { | ||
| try { | ||
| Utils.checkArgument(true, "test %s", "test"); | ||
| } | ||
| catch (IllegalArgumentException e) { | ||
| fail(); | ||
| } | ||
| } | ||
|
|
||
| @Test | ||
| public void testMemoizedSupplierThreadSafe() | ||
| throws Throwable | ||
| { | ||
| Function<Supplier<Boolean>, Supplier<Boolean>> memoizer = | ||
| supplier -> Utils.memoizedSupplier(supplier); | ||
| testSupplierThreadSafe(memoizer); | ||
| } | ||
|
|
||
| /** | ||
| * Vendored from Guava | ||
| */ | ||
| private void testSupplierThreadSafe(Function<Supplier<Boolean>, Supplier<Boolean>> memoizer) | ||
| throws Throwable | ||
| { | ||
| final AtomicInteger count = new AtomicInteger(0); | ||
| final AtomicReference<Throwable> thrown = new AtomicReference<>(null); | ||
| final int numThreads = 3; | ||
| final Thread[] threads = new Thread[numThreads]; | ||
| final long timeout = TimeUnit.SECONDS.toNanos(60); | ||
|
|
||
| final Supplier<Boolean> supplier = | ||
| new Supplier<Boolean>() | ||
| { | ||
| boolean isWaiting(Thread thread) | ||
| { | ||
| switch (thread.getState()) { | ||
| case BLOCKED: | ||
| case WAITING: | ||
| case TIMED_WAITING: | ||
| return true; | ||
| default: | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| int waitingThreads() | ||
| { | ||
| int waitingThreads = 0; | ||
| for (Thread thread : threads) { | ||
| if (isWaiting(thread)) { | ||
| waitingThreads++; | ||
| } | ||
| } | ||
| return waitingThreads; | ||
| } | ||
|
|
||
| @Override | ||
| @SuppressWarnings("ThreadPriorityCheck") // doing our best to test for races | ||
| public Boolean get() | ||
| { | ||
| // Check that this method is called exactly once, by the first | ||
| // thread to synchronize. | ||
| long t0 = System.nanoTime(); | ||
| while (waitingThreads() != numThreads - 1) { | ||
| if (System.nanoTime() - t0 > timeout) { | ||
| thrown.set( | ||
| new TimeoutException( | ||
| "timed out waiting for other threads to block" | ||
| + " synchronizing on supplier")); | ||
| break; | ||
| } | ||
| Thread.yield(); | ||
| } | ||
| count.getAndIncrement(); | ||
| return Boolean.TRUE; | ||
| } | ||
| }; | ||
|
|
||
| final Supplier<Boolean> memoizedSupplier = memoizer.apply(supplier); | ||
|
|
||
| for (int i = 0; i < numThreads; i++) { | ||
| threads[i] = | ||
| new Thread() | ||
| { | ||
| @Override | ||
| public void run() | ||
| { | ||
| assertSame(Boolean.TRUE, memoizedSupplier.get()); | ||
| } | ||
| }; | ||
| } | ||
| for (Thread t : threads) { | ||
| t.start(); | ||
| } | ||
| for (Thread t : threads) { | ||
| t.join(); | ||
| } | ||
|
|
||
| if (thrown.get() != null) { | ||
| throw thrown.get(); | ||
| } | ||
| assertEquals(1, count.get()); | ||
| } | ||
| } |
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