test ResizableCapacityLinkedBlockingQueue (#1350)

infra/common/src/test/java/cn/hippo4j/common/executor/support/ResizableCapacityLinkedBlockingQueueTest.java

@@ -0,0 +1,107 @@
+/*
+ * 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 cn.hippo4j.common.executor.support;
+
+import cn.hippo4j.common.toolkit.ThreadUtil;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.concurrent.RejectedExecutionHandler;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.IntStream;
+
+@Slf4j
+public class ResizableCapacityLinkedBlockingQueueTest {
+
+    @Test
+    public void testResizableCapacityLinkedBlockingQueueSize() throws InterruptedException {
+        ResizableCapacityLinkedBlockingQueue<Integer> queue1 = new ResizableCapacityLinkedBlockingQueue(10);
+        queue1.setCapacity(20);
+        Assert.assertEquals(20, queue1.remainingCapacity());
+        queue1.add(1);
+        Assert.assertEquals(19, queue1.remainingCapacity());
+        ResizableCapacityLinkedBlockingQueue<Integer> queue2 = new ResizableCapacityLinkedBlockingQueue(Arrays.asList(1, 2, 3, 4));
+        queue2.setCapacity(5);
+        Assert.assertEquals(1, queue2.remainingCapacity());
+    }
+
+    @Test
+    public void testIncreaseResizableCapacityLinkedBlockingQueue() throws InterruptedException {
+        MyRejectedExecutionHandler myRejectedExecutionHandler = new MyRejectedExecutionHandler();
+        ResizableCapacityLinkedBlockingQueue<Runnable> queue = new ResizableCapacityLinkedBlockingQueue();
+
+        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 1,
+                60, TimeUnit.SECONDS, queue, myRejectedExecutionHandler);
+        Assert.assertSame(queue, threadPoolExecutor.getQueue());
+        threadPoolExecutor.prestartAllCoreThreads();
+        queue.setCapacity(6);
+        IntStream.range(0, 4).forEach(s -> {
+            threadPoolExecutor.execute(() -> ThreadUtil.sleep(0L));
+        });
+        threadPoolExecutor.shutdown();
+        while (!threadPoolExecutor.isTerminated()) {
+        }
+        Assert.assertEquals(4, threadPoolExecutor.getCompletedTaskCount());
+        Assert.assertEquals(0, myRejectedExecutionHandler.getCount());
+
+    }
+
+    @Test
+    public void testDecreaseResizableCapacityLinkedBlockingQueue() throws InterruptedException {
+        MyRejectedExecutionHandler myRejectedExecutionHandler = new MyRejectedExecutionHandler();
+        ResizableCapacityLinkedBlockingQueue<Runnable> queue = new ResizableCapacityLinkedBlockingQueue<>(4);
+
+        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 1,
+                60, TimeUnit.SECONDS, queue, myRejectedExecutionHandler);
+        Assert.assertSame(queue, threadPoolExecutor.getQueue());
+        threadPoolExecutor.prestartAllCoreThreads();
+        queue.setCapacity(0);
+        IntStream.range(0, 4).forEach(s -> {
+            threadPoolExecutor.execute(() -> ThreadUtil.sleep(0L));
+        });
+        threadPoolExecutor.shutdown();
+        while (!threadPoolExecutor.isTerminated()) {
+        }
+        Assert.assertEquals(0, threadPoolExecutor.getCompletedTaskCount());
+        Assert.assertEquals(4, myRejectedExecutionHandler.getCount());
+
+    }
+}
+
+class MyRejectedExecutionHandler implements RejectedExecutionHandler {
+
+    public AtomicInteger count = new AtomicInteger(0);
+
+    @Override
+    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
+        if (executor.isShutdown()) {
+            return;
+        }
+        if (!executor.getQueue().offer(r)) {
+            count.incrementAndGet();
+        }
+    }
+
+    public int getCount() {
+        return count.get();
+    }
+}