| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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 org.onlab.util; |
| |
| import org.apache.commons.lang.mutable.MutableBoolean; |
| import org.junit.Ignore; |
| import org.junit.Test; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.TimeUnit; |
| |
| import static org.junit.Assert.*; |
| |
| /** |
| * Tests of the BlockingBoolean utility. |
| */ |
| public class BlockingBooleanTest { |
| |
| private static final int FAIL_TIMEOUT = 1000; //ms |
| |
| @Test |
| public void basics() { |
| BlockingBoolean b = new BlockingBoolean(false); |
| assertEquals(false, b.get()); |
| b.set(true); |
| assertEquals(true, b.get()); |
| b.set(true); |
| assertEquals(true, b.get()); |
| b.set(false); |
| assertEquals(false, b.get()); |
| } |
| |
| private void waitChange(boolean value, int numThreads) { |
| BlockingBoolean b = new BlockingBoolean(!value); |
| |
| CountDownLatch latch = new CountDownLatch(numThreads); |
| ExecutorService exec = Executors.newFixedThreadPool(numThreads); |
| for (int i = 0; i < numThreads; i++) { |
| exec.submit(() -> { |
| try { |
| b.await(value); |
| latch.countDown(); |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| }); |
| } |
| b.set(value); |
| try { |
| assertTrue(latch.await(FAIL_TIMEOUT, TimeUnit.MILLISECONDS)); |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| exec.shutdown(); |
| } |
| |
| @Test |
| public void waitTrueChange() { |
| waitChange(true, 4); |
| } |
| |
| @Test |
| public void waitFalseChange() { |
| waitChange(false, 4); |
| } |
| |
| @Test |
| public void waitSame() { |
| BlockingBoolean b = new BlockingBoolean(true); |
| |
| CountDownLatch latch = new CountDownLatch(1); |
| ExecutorService exec = Executors.newSingleThreadExecutor(); |
| exec.submit(() -> { |
| try { |
| b.await(true); |
| latch.countDown(); |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| }); |
| try { |
| assertTrue(latch.await(FAIL_TIMEOUT, TimeUnit.MILLISECONDS)); |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| exec.shutdown(); |
| } |
| |
| @Test |
| public void someWait() { |
| BlockingBoolean b = new BlockingBoolean(false); |
| |
| int numThreads = 4; |
| CountDownLatch sameLatch = new CountDownLatch(numThreads / 2); |
| CountDownLatch waitLatch = new CountDownLatch(numThreads / 2); |
| |
| ExecutorService exec = Executors.newFixedThreadPool(numThreads); |
| for (int i = 0; i < numThreads; i++) { |
| final boolean value = (i % 2 == 1); |
| exec.submit(() -> { |
| try { |
| b.await(value); |
| if (value) { |
| waitLatch.countDown(); |
| } else { |
| sameLatch.countDown(); |
| } |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| }); |
| } |
| try { |
| assertTrue(sameLatch.await(FAIL_TIMEOUT, TimeUnit.MILLISECONDS)); |
| assertEquals(waitLatch.getCount(), numThreads / 2); |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| b.set(true); |
| try { |
| assertTrue(waitLatch.await(FAIL_TIMEOUT, TimeUnit.MILLISECONDS)); |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| exec.shutdown(); |
| } |
| |
| @Test |
| public void waitTimeout() { |
| BlockingBoolean b = new BlockingBoolean(true); |
| |
| CountDownLatch latch = new CountDownLatch(1); |
| ExecutorService exec = Executors.newSingleThreadExecutor(); |
| exec.submit(() -> { |
| try { |
| if (!b.await(false, 1, TimeUnit.NANOSECONDS)) { |
| latch.countDown(); |
| } else { |
| fail(); |
| } |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| }); |
| try { |
| assertTrue(latch.await(FAIL_TIMEOUT, TimeUnit.MILLISECONDS)); |
| } catch (InterruptedException e) { |
| fail(); |
| } |
| exec.shutdown(); |
| |
| } |
| |
| @Test |
| @Ignore |
| public void samePerf() { |
| int iters = 10_000; |
| |
| BlockingBoolean b1 = new BlockingBoolean(false); |
| long t1 = System.nanoTime(); |
| for (int i = 0; i < iters; i++) { |
| b1.set(false); |
| } |
| long t2 = System.nanoTime(); |
| MutableBoolean b2 = new MutableBoolean(false); |
| for (int i = 0; i < iters; i++) { |
| b2.setValue(false); |
| } |
| long t3 = System.nanoTime(); |
| System.out.println((t2 - t1) + " " + (t3 - t2) + " " + ((t2 - t1) <= (t3 - t2))); |
| } |
| |
| @Test |
| @Ignore |
| public void changePerf() { |
| int iters = 10_000; |
| |
| BlockingBoolean b1 = new BlockingBoolean(false); |
| boolean v = true; |
| long t1 = System.nanoTime(); |
| for (int i = 0; i < iters; i++) { |
| b1.set(v); |
| v = !v; |
| } |
| long t2 = System.nanoTime(); |
| MutableBoolean b2 = new MutableBoolean(false); |
| for (int i = 0; i < iters; i++) { |
| b2.setValue(v); |
| v = !v; |
| } |
| long t3 = System.nanoTime(); |
| System.out.println((t2 - t1) + " " + (t3 - t2) + " " + ((t2 - t1) <= (t3 - t2))); |
| } |
| |
| } |