| /** |
| * 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.blobstore; |
| |
| import org.apache.storm.generated.SettableBlobMeta; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.nio.file.Files; |
| import java.nio.file.StandardCopyOption; |
| import java.util.regex.Matcher; |
| |
| public class LocalFsBlobStoreFile extends BlobStoreFile { |
| |
| private final String _key; |
| private final boolean _isTmp; |
| private final File _path; |
| private Long _modTime = null; |
| private final boolean _mustBeNew; |
| private SettableBlobMeta meta; |
| |
| public LocalFsBlobStoreFile(File base, String name) { |
| if (BlobStoreFile.BLOBSTORE_DATA_FILE.equals(name)) { |
| _isTmp = false; |
| } else { |
| Matcher m = TMP_NAME_PATTERN.matcher(name); |
| if (!m.matches()) { |
| throw new IllegalArgumentException("File name does not match '"+name+"' !~ "+TMP_NAME_PATTERN); |
| } |
| _isTmp = true; |
| } |
| _key = base.getName(); |
| _path = new File(base, name); |
| _mustBeNew = false; |
| } |
| |
| public LocalFsBlobStoreFile(File base, boolean isTmp, boolean mustBeNew) { |
| _key = base.getName(); |
| _isTmp = isTmp; |
| _mustBeNew = mustBeNew; |
| if (_isTmp) { |
| _path = new File(base, System.currentTimeMillis()+TMP_EXT); |
| } else { |
| _path = new File(base, BlobStoreFile.BLOBSTORE_DATA_FILE); |
| } |
| } |
| |
| @Override |
| public void delete() throws IOException { |
| _path.delete(); |
| } |
| |
| @Override |
| public boolean isTmp() { |
| return _isTmp; |
| } |
| |
| @Override |
| public String getKey() { |
| return _key; |
| } |
| |
| @Override |
| public long getModTime() throws IOException { |
| if (_modTime == null) { |
| _modTime = _path.lastModified(); |
| } |
| return _modTime; |
| } |
| |
| @Override |
| public InputStream getInputStream() throws IOException { |
| if (isTmp()) { |
| throw new IllegalStateException("Cannot read from a temporary part file."); |
| } |
| return new FileInputStream(_path); |
| } |
| |
| @Override |
| public OutputStream getOutputStream() throws IOException { |
| if (!isTmp()) { |
| throw new IllegalStateException("Can only write to a temporary part file."); |
| } |
| boolean success = false; |
| try { |
| success = _path.createNewFile(); |
| } catch (IOException e) { |
| //Try to create the parent directory, may not work |
| _path.getParentFile().mkdirs(); |
| success = _path.createNewFile(); |
| } |
| if (!success) { |
| throw new IOException(_path+" already exists"); |
| } |
| return new FileOutputStream(_path); |
| } |
| |
| @Override |
| public void commit() throws IOException { |
| if (!isTmp()) { |
| throw new IllegalStateException("Can only write to a temporary part file."); |
| } |
| |
| File dest = new File(_path.getParentFile(), BlobStoreFile.BLOBSTORE_DATA_FILE); |
| if (_mustBeNew) { |
| Files.move(_path.toPath(), dest.toPath(), StandardCopyOption.ATOMIC_MOVE); |
| } else { |
| Files.move(_path.toPath(), dest.toPath(), StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING); |
| } |
| } |
| |
| @Override |
| public void cancel() throws IOException { |
| if (!isTmp()) { |
| throw new IllegalStateException("Can only write to a temporary part file."); |
| } |
| delete(); |
| } |
| |
| @Override |
| public SettableBlobMeta getMetadata () { |
| return meta; |
| } |
| |
| @Override |
| public void setMetadata (SettableBlobMeta meta) { |
| this.meta = meta; |
| } |
| |
| @Override |
| public String toString() { |
| return _path+":"+(_isTmp ? "tmp": BlobStoreFile.BLOBSTORE_DATA_FILE)+":"+_key; |
| } |
| |
| @Override |
| public long getFileLength() { |
| return _path.length(); |
| } |
| } |
| |