| /** |
| * 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.hadoop.yarn.server.sharedcachemanager.store; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Evolving; |
| |
| /** |
| * Class that encapsulates the cache resource. The instances are not thread |
| * safe. Any operation that uses the resource must use thread-safe mechanisms to |
| * ensure safe access with the only exception of the filename. |
| */ |
| @Private |
| @Evolving |
| class SharedCacheResource { |
| private long accessTime; |
| private final Set<SharedCacheResourceReference> refs; |
| private final String fileName; |
| |
| SharedCacheResource(String fileName) { |
| this.accessTime = System.currentTimeMillis(); |
| this.refs = new HashSet<SharedCacheResourceReference>(); |
| this.fileName = fileName; |
| } |
| |
| long getAccessTime() { |
| return accessTime; |
| } |
| |
| void updateAccessTime() { |
| accessTime = System.currentTimeMillis(); |
| } |
| |
| String getFileName() { |
| return this.fileName; |
| } |
| |
| Set<SharedCacheResourceReference> getResourceReferences() { |
| return this.refs; |
| } |
| |
| boolean addReference(SharedCacheResourceReference ref) { |
| return this.refs.add(ref); |
| } |
| } |