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java/org/apache/tomcat/dbcp/pool2/impl/InterruptibleReentrantLock.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.dbcp.pool2.impl;
+
+import java.util.Collection;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * This sub-class was created to expose the waiting threads so that they can be
+ * interrupted when the pool using the queue that uses this lock is closed. The
+ * class is intended for internal use only.
+ * <p>
+ * This class is intended to be thread-safe.
+ * </p>
+ *
+ * @since 2.0
+ */
+class InterruptibleReentrantLock extends ReentrantLock {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Create a new InterruptibleReentrantLock with the given fairness policy.
+     *
+     * @param fairness true means threads should acquire contended locks as if
+     * waiting in a FIFO queue
+     */
+    public InterruptibleReentrantLock(final boolean fairness) {
+        super(fairness);
+    }
+
+    /**
+     * Interrupt the threads that are waiting on a specific condition
+     *
+     * @param condition the condition on which the threads are waiting.
+     */
+    public void interruptWaiters(final Condition condition) {
+        final Collection<Thread> threads = getWaitingThreads(condition);
+        for (final Thread thread : threads) {
+            thread.interrupt();
+        }
+    }
+}