[RIP-10] Add test cases for ServiceThread (#862)

common/src/test/java/org/apache/rocketmq/common/ServiceThreadTest.java

+/*
+ * 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.rocketmq.common;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class ServiceThreadTest {
+
+    @Test
+    public void testShutdown() {
+        shutdown(false, false);
+        shutdown(false, true);
+        shutdown(true, false);
+        shutdown(true, true);
+    }
+
+    @Test
+    public void testStop() {
+        stop(true);
+        stop(false);
+    }
+
+    @Test
+    public void testMakeStop() {
+        ServiceThread testServiceThread = startTestServiceThread();
+        testServiceThread.makeStop();
+        assertEquals(true, testServiceThread.isStopped());
+    }
+
+    @Test
+    public void testWakeup() {
+        ServiceThread testServiceThread = startTestServiceThread();
+        testServiceThread.wakeup();
+        assertEquals(true, testServiceThread.hasNotified.get());
+        assertEquals(0, testServiceThread.waitPoint.getCount());
+    }
+
+    @Test
+    public void testWaitForRunning() {
+        ServiceThread testServiceThread = startTestServiceThread();
+        // test waitForRunning
+        testServiceThread.waitForRunning(1000);
+        assertEquals(false, testServiceThread.hasNotified.get());
+        assertEquals(1, testServiceThread.waitPoint.getCount());
+        // test wake up
+        testServiceThread.wakeup();
+        assertEquals(true, testServiceThread.hasNotified.get());
+        assertEquals(0, testServiceThread.waitPoint.getCount());
+        // repeat waitForRunning
+        testServiceThread.waitForRunning(1000);
+        assertEquals(false, testServiceThread.hasNotified.get());
+        assertEquals(0, testServiceThread.waitPoint.getCount());
+        // repeat waitForRunning again
+        testServiceThread.waitForRunning(1000);
+        assertEquals(false, testServiceThread.hasNotified.get());
+        assertEquals(1, testServiceThread.waitPoint.getCount());
+    }
+
+    private ServiceThread startTestServiceThread() {
+        return startTestServiceThread(false);
+    }
+
+    private ServiceThread startTestServiceThread(boolean daemon) {
+        ServiceThread testServiceThread = new ServiceThread() {
+
+            @Override
+            public void run() {
+                doNothing();
+            }
+
+            private void doNothing() {}
+
+            @Override
+            public String getServiceName() {
+                return "TestServiceThread";
+            }
+        };
+        testServiceThread.thread.setDaemon(daemon);
+        // test start
+        testServiceThread.start();
+        assertEquals(false, testServiceThread.isStopped());
+        return testServiceThread;
+    }
+
+    public void shutdown(boolean daemon, boolean interrupt) {
+        ServiceThread testServiceThread = startTestServiceThread(daemon);
+        shutdown0(interrupt, testServiceThread);
+        // repeat
+        shutdown0(interrupt, testServiceThread);
+    }
+
+    private void shutdown0(boolean interrupt, ServiceThread testServiceThread) {
+        if (interrupt) {
+            testServiceThread.shutdown(true);
+        } else {
+            testServiceThread.shutdown();
+        }
+        assertEquals(true, testServiceThread.isStopped());
+        assertEquals(true, testServiceThread.hasNotified.get());
+        assertEquals(0, testServiceThread.waitPoint.getCount());
+    }
+
+    public void stop(boolean interrupt) {
+        ServiceThread testServiceThread = startTestServiceThread();
+        stop0(interrupt, testServiceThread);
+        // repeat
+        stop0(interrupt, testServiceThread);
+    }
+
+    private void stop0(boolean interrupt, ServiceThread testServiceThread) {
+        if (interrupt) {
+            testServiceThread.stop(true);
+        } else {
+            testServiceThread.stop();
+        }
+        assertEquals(true, testServiceThread.isStopped());
+        assertEquals(true, testServiceThread.hasNotified.get());
+        assertEquals(0, testServiceThread.waitPoint.getCount());
+    }
+
+}