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test/org/apache/tomcat/util/collections/TesterPerformanceSynchronizedQueue.java

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+/*
+ * 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.tomcat.util.collections;
+
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.junit.Test;
+
+public class TesterPerformanceSynchronizedQueue {
+
+    private static final int THREAD_COUNT = 4;
+    private static final int ITERATIONS = 1000000;
+
+    private static final SynchronizedQueue<Object> S_QUEUE =
+            new SynchronizedQueue<>();
+
+    private static final Queue<Object> QUEUE = new ConcurrentLinkedQueue<>();
+
+    @Test
+    public void testSynchronizedQueue() throws InterruptedException {
+        Thread[] threads = new Thread[THREAD_COUNT];
+        for (int i = 0; i < THREAD_COUNT; i++) {
+            threads[i] = new StackThread();
+        }
+
+        long start = System.currentTimeMillis();
+
+        for (int i = 0; i < THREAD_COUNT; i++) {
+            threads[i].start();
+        }
+
+        for (int i = 0; i < THREAD_COUNT; i++) {
+            threads[i].join();
+        }
+
+        long end = System.currentTimeMillis();
+
+        System.out.println("SynchronizedQueue: " + (end - start) + "ms");
+    }
+
+    public static class StackThread extends Thread {
+
+        @Override
+        public void run() {
+            for(int i = 0; i < ITERATIONS; i++) {
+                Object obj = S_QUEUE.poll();
+                if (obj == null) {
+                    obj = new Object();
+                }
+                S_QUEUE.offer(obj);
+            }
+            super.run();
+        }
+    }
+
+    @Test
+    public void testConcurrentQueue() throws InterruptedException {
+        Thread[] threads = new Thread[THREAD_COUNT];
+        for (int i = 0; i < THREAD_COUNT; i++) {
+            threads[i] = new QueueThread();
+        }
+
+        long start = System.currentTimeMillis();
+
+        for (int i = 0; i < THREAD_COUNT; i++) {
+            threads[i].start();
+        }
+
+        for (int i = 0; i < THREAD_COUNT; i++) {
+            threads[i].join();
+        }
+
+        long end = System.currentTimeMillis();
+
+        System.out.println("ConcurrentLinkedQueue: " + (end - start) + "ms");
+    }
+
+    public static class QueueThread extends Thread {
+
+        @Override
+        public void run() {
+            for(int i = 0; i < ITERATIONS; i++) {
+                Object obj = QUEUE.poll();
+                if (obj == null) {
+                    obj = new Object();
+                }
+                QUEUE.offer(obj);
+            }
+            super.run();
+        }
+    }
+}