Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/4764#discussion_r143686389
--- Diff:
flink-core/src/test/java/org/apache/flink/util/ResourceGuardTest.java ---
@@ -0,0 +1,135 @@
+/*
+ * 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.flink.util;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class ResourceGuardTest {
+
+ @Test
+ public void testClose() {
+ ResourceGuard resourceGuard = new ResourceGuard();
+ Assert.assertFalse(resourceGuard.isClosed());
+ resourceGuard.close();
+ Assert.assertTrue(resourceGuard.isClosed());
+ try {
+ resourceGuard.acquireResource();
+ Assert.fail();
+ } catch (IOException ignore) {
+ }
+ }
+
+ @Test
+ public void testAcquireReleaseClose() throws IOException {
+ ResourceGuard resourceGuard = new ResourceGuard();
+ ResourceGuard.Lease lease = resourceGuard.acquireResource();
+ Assert.assertEquals(1, resourceGuard.getLeaseCount());
+ lease.close();
+ Assert.assertEquals(0, resourceGuard.getLeaseCount());
+ resourceGuard.close();
+ Assert.assertTrue(resourceGuard.isClosed());
+ }
+
+ @Test
+ public void testCloseBlockIfAcquired() throws Exception {
+ ResourceGuard resourceGuard = new ResourceGuard();
+ ResourceGuard.Lease lease_1 = resourceGuard.acquireResource();
+ AtomicBoolean checker = new AtomicBoolean(true);
+
+ Thread closerThread = new Thread() {
+ @Override
+ public void run() {
+ try {
+ // this line should block until all
acquires are matched by releases.
+ resourceGuard.close();
+ checker.set(false);
+ } catch (Exception ignore) {
+ checker.set(false);
+ }
+ }
+ };
+
+ closerThread.start();
+
+ ResourceGuard.Lease lease_2 = resourceGuard.acquireResource();
+ lease_2.close();
+ Thread.sleep(50);
--- End diff --
I don't like sleep in tests but I don't see what else to do.
---
