| /* |
| * 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.flink.fs.s3.common.utils; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.annotation.VisibleForTesting; |
| import org.apache.flink.util.ExceptionUtils; |
| import org.apache.flink.util.IOUtils; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.nio.file.Files; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import static org.apache.flink.util.Preconditions.checkNotNull; |
| |
| /** |
| * A reference counted file which is deleted as soon as no caller |
| * holds a reference to the wrapped {@link File}. |
| */ |
| @Internal |
| public class RefCountedFile implements RefCounted { |
| |
| private final File file; |
| |
| private final OffsetAwareOutputStream stream; |
| |
| private final AtomicInteger references; |
| |
| private boolean closed; |
| |
| private RefCountedFile( |
| final File file, |
| final OutputStream currentOut, |
| final long bytesInCurrentPart) { |
| this.file = checkNotNull(file); |
| this.references = new AtomicInteger(1); |
| this.stream = new OffsetAwareOutputStream( |
| currentOut, |
| bytesInCurrentPart); |
| this.closed = false; |
| } |
| |
| public File getFile() { |
| return file; |
| } |
| |
| public OffsetAwareOutputStream getStream() { |
| return stream; |
| } |
| |
| public long getLength() { |
| return stream.getLength(); |
| } |
| |
| public void write(byte[] b, int off, int len) throws IOException { |
| requireOpened(); |
| if (len > 0) { |
| stream.write(b, off, len); |
| } |
| } |
| |
| public void flush() throws IOException { |
| requireOpened(); |
| stream.flush(); |
| } |
| |
| public void closeStream() { |
| if (!closed) { |
| IOUtils.closeQuietly(stream); |
| closed = true; |
| } |
| } |
| |
| @Override |
| public void retain() { |
| references.incrementAndGet(); |
| } |
| |
| @Override |
| public boolean release() { |
| if (references.decrementAndGet() == 0) { |
| return tryClose(); |
| } |
| return false; |
| } |
| |
| private boolean tryClose() { |
| try { |
| Files.deleteIfExists(file.toPath()); |
| return true; |
| } catch (Throwable t) { |
| ExceptionUtils.rethrowIfFatalError(t); |
| } |
| return false; |
| } |
| |
| private void requireOpened() throws IOException { |
| if (closed) { |
| throw new IOException("Stream closed."); |
| } |
| } |
| |
| @VisibleForTesting |
| int getReferenceCounter() { |
| return references.get(); |
| } |
| |
| // ------------------------------ Factory methods for initializing a temporary file ------------------------------ |
| |
| public static RefCountedFile newFile( |
| final File file, |
| final OutputStream currentOut) throws IOException { |
| return new RefCountedFile(file, currentOut, 0L); |
| } |
| |
| public static RefCountedFile restoredFile( |
| final File file, |
| final OutputStream currentOut, |
| final long bytesInCurrentPart) { |
| return new RefCountedFile(file, currentOut, bytesInCurrentPart); |
| } |
| } |