| /* |
| * 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. |
| */ |
| /** |
| * @author Dmitry B. Yershov |
| */ |
| |
| package java.lang.ref; |
| |
| /** |
| * @com.intel.drl.spec_ref |
| */ |
| public class ReferenceQueue<T> extends Object { |
| |
| private Reference<? extends T> firstReference; |
| |
| /** |
| * @com.intel.drl.spec_ref |
| */ |
| public ReferenceQueue() { |
| } |
| |
| /** |
| * @com.intel.drl.spec_ref |
| */ |
| @SuppressWarnings("unchecked") |
| public synchronized Reference<? extends T> poll() { |
| if (firstReference == null) |
| return null; |
| Reference<? extends T> ref = firstReference; |
| firstReference = (firstReference.next == firstReference ? null |
| : firstReference.next); |
| ref.next = null; |
| return ref; |
| } |
| |
| /** |
| * @com.intel.drl.spec_ref |
| */ |
| @SuppressWarnings("unchecked") |
| public synchronized Reference<? extends T> remove(long timeout) |
| throws IllegalArgumentException, InterruptedException { |
| if (firstReference == null) |
| wait(timeout); |
| if (firstReference == null) |
| return null; |
| Reference<? extends T> ref = firstReference; |
| firstReference = (firstReference.next == firstReference ? null |
| : firstReference.next); |
| ref.next = null; |
| return ref; |
| } |
| |
| /** |
| * @com.intel.drl.spec_ref |
| */ |
| public Reference<? extends T> remove() throws InterruptedException { |
| return remove(0L); |
| } |
| |
| synchronized boolean enqueue(Reference<? extends T> ref) { |
| ref.next = (firstReference == null ? ref : firstReference); |
| firstReference = ref; |
| notify(); |
| return true; |
| } |
| } |