| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.bookkeeper.common.util; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.TimeUnit; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| /** |
| * Tests for {@link MemoryLimitController}. |
| */ |
| public class MemoryLimitControllerTest { |
| |
| private ExecutorService executor; |
| |
| @Before |
| public void setup() { |
| executor = Executors.newCachedThreadPool(); |
| } |
| |
| @After |
| public void teardown() { |
| executor.shutdownNow(); |
| } |
| |
| @Test |
| public void testLimit() throws Exception { |
| MemoryLimitController mlc = new MemoryLimitController(100); |
| |
| for (int i = 0; i < 101; i++) { |
| mlc.reserveMemory(1); |
| } |
| |
| assertEquals(101, mlc.currentUsage()); |
| assertFalse(mlc.tryReserveMemory(1)); |
| mlc.releaseMemory(1); |
| assertEquals(100, mlc.currentUsage()); |
| |
| assertTrue(mlc.tryReserveMemory(1)); |
| assertEquals(101, mlc.currentUsage()); |
| } |
| |
| @Test |
| public void testBlocking() throws Exception { |
| MemoryLimitController mlc = new MemoryLimitController(100); |
| |
| for (int i = 0; i < 101; i++) { |
| mlc.reserveMemory(1); |
| } |
| |
| CountDownLatch l1 = new CountDownLatch(1); |
| executor.submit(() -> { |
| try { |
| mlc.reserveMemory(1); |
| l1.countDown(); |
| } catch (InterruptedException e) { |
| } |
| }); |
| |
| CountDownLatch l2 = new CountDownLatch(1); |
| executor.submit(() -> { |
| try { |
| mlc.reserveMemory(1); |
| l2.countDown(); |
| } catch (InterruptedException e) { |
| } |
| }); |
| |
| CountDownLatch l3 = new CountDownLatch(1); |
| executor.submit(() -> { |
| try { |
| mlc.reserveMemory(1); |
| l3.countDown(); |
| } catch (InterruptedException e) { |
| } |
| }); |
| |
| // The threads are blocked since the quota is full |
| assertFalse(l1.await(100, TimeUnit.MILLISECONDS)); |
| assertFalse(l2.await(100, TimeUnit.MILLISECONDS)); |
| assertFalse(l3.await(100, TimeUnit.MILLISECONDS)); |
| |
| assertEquals(101, mlc.currentUsage()); |
| mlc.releaseMemory(3); |
| |
| assertTrue(l1.await(1, TimeUnit.SECONDS)); |
| assertTrue(l2.await(1, TimeUnit.SECONDS)); |
| assertTrue(l3.await(1, TimeUnit.SECONDS)); |
| assertEquals(101, mlc.currentUsage()); |
| } |
| |
| @Test |
| public void testStepRelease() throws Exception { |
| MemoryLimitController mlc = new MemoryLimitController(100); |
| |
| for (int i = 0; i < 101; i++) { |
| mlc.reserveMemory(1); |
| } |
| |
| CountDownLatch l1 = new CountDownLatch(1); |
| executor.submit(() -> { |
| try { |
| mlc.reserveMemory(1); |
| l1.countDown(); |
| } catch (InterruptedException e) { |
| } |
| }); |
| |
| CountDownLatch l2 = new CountDownLatch(1); |
| executor.submit(() -> { |
| try { |
| mlc.reserveMemory(1); |
| l2.countDown(); |
| } catch (InterruptedException e) { |
| } |
| }); |
| |
| CountDownLatch l3 = new CountDownLatch(1); |
| executor.submit(() -> { |
| try { |
| mlc.reserveMemory(1); |
| l3.countDown(); |
| } catch (InterruptedException e) { |
| } |
| }); |
| |
| // The threads are blocked since the quota is full |
| assertFalse(l1.await(100, TimeUnit.MILLISECONDS)); |
| assertFalse(l2.await(100, TimeUnit.MILLISECONDS)); |
| assertFalse(l3.await(100, TimeUnit.MILLISECONDS)); |
| |
| assertEquals(101, mlc.currentUsage()); |
| |
| mlc.releaseMemory(1); |
| mlc.releaseMemory(1); |
| mlc.releaseMemory(1); |
| |
| assertTrue(l1.await(1, TimeUnit.SECONDS)); |
| assertTrue(l2.await(1, TimeUnit.SECONDS)); |
| assertTrue(l3.await(1, TimeUnit.SECONDS)); |
| assertEquals(101, mlc.currentUsage()); |
| } |
| } |