| /** |
| * 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.storm.localizer; |
| |
| import org.apache.storm.utils.Utils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| /** |
| * Represents a resource that is localized on the supervisor. |
| * A localized resource has a .current symlink to the current version file which is named |
| * filename.{current version}. There is also a filename.version which contains the latest version. |
| */ |
| public class LocalizedResource { |
| public static final Logger LOG = LoggerFactory.getLogger(LocalizedResource.class); |
| |
| // filesystem path to the resource |
| private final String _localPath; |
| private final String _versionFilePath; |
| private final String _symlinkPath; |
| private final String _key; |
| private final boolean _uncompressed; |
| // _size of the resource |
| private long _size = -1; |
| // queue of topologies referencing resource |
| private final Set<String> _ref; |
| // last access time of the resource -> increment when topology finishes using it |
| private final AtomicLong _lastAccessTime = new AtomicLong(currentTime()); |
| |
| public LocalizedResource(String key, String fileLoc, boolean uncompressed) { |
| _ref = new HashSet<String>(); |
| _localPath = fileLoc; |
| _versionFilePath = Utils.constructVersionFileName(fileLoc); |
| _symlinkPath = Utils.constructBlobCurrentSymlinkName(fileLoc); |
| _uncompressed = uncompressed; |
| _key = key; |
| // we trust that the file exists |
| _size = Utils.getDU(new File(getFilePathWithVersion())); |
| LOG.debug("size of {} is: {}", fileLoc, _size); |
| } |
| |
| // create local resource and add reference |
| public LocalizedResource(String key, String fileLoc, boolean uncompressed, String topo) { |
| this(key, fileLoc, uncompressed); |
| _ref.add(topo); |
| } |
| |
| public boolean isUncompressed() { |
| return _uncompressed; |
| } |
| |
| public String getKey() { |
| return _key; |
| } |
| |
| public String getCurrentSymlinkPath() { |
| return _symlinkPath; |
| } |
| |
| public String getVersionFilePath() { |
| return _versionFilePath; |
| } |
| |
| public String getFilePathWithVersion() { |
| long version = Utils.localVersionOfBlob(_localPath); |
| return Utils.constructBlobWithVersionFileName(_localPath, version); |
| } |
| |
| public String getFilePath() { |
| return _localPath; |
| } |
| |
| public void addReference(String topo) { |
| _ref.add(topo); |
| } |
| |
| public void removeReference(String topo) { |
| if (!_ref.remove(topo)) { |
| LOG.warn("Tried to remove a reference to a topology that doesn't use this resource"); |
| } |
| setTimestamp(); |
| } |
| |
| // The last access time is only valid if the resource doesn't have any references. |
| public long getLastAccessTime() { |
| return _lastAccessTime.get(); |
| } |
| |
| // for testing |
| protected void setSize(long size) { |
| _size = size; |
| } |
| |
| public long getSize() { |
| return _size; |
| } |
| |
| private void setTimestamp() { |
| _lastAccessTime.set(currentTime()); |
| } |
| |
| public int getRefCount() { |
| return _ref.size(); |
| } |
| |
| private long currentTime() { |
| return System.nanoTime(); |
| } |
| |
| } |