| /** |
| * 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.hbase.io.asyncfs; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.io.ByteArrayOutputStream; |
| import org.apache.hadoop.hbase.util.CancelableProgressable; |
| import org.apache.hadoop.hdfs.protocol.DatanodeInfo; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| import org.apache.hbase.thirdparty.com.google.common.base.Preconditions; |
| import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder; |
| |
| /** |
| * An {@link AsyncFSOutput} wraps a {@link FSDataOutputStream}. |
| */ |
| @InterfaceAudience.Private |
| public class WrapperAsyncFSOutput implements AsyncFSOutput { |
| |
| private final FSDataOutputStream out; |
| |
| private ByteArrayOutputStream buffer = new ByteArrayOutputStream(); |
| |
| private final ExecutorService executor; |
| |
| public WrapperAsyncFSOutput(Path file, FSDataOutputStream out) { |
| this.out = out; |
| this.executor = Executors.newSingleThreadExecutor(new ThreadFactoryBuilder().setDaemon(true) |
| .setNameFormat("AsyncFSOutputFlusher-" + file.toString().replace("%", "%%")).build()); |
| } |
| |
| @Override |
| public void write(byte[] b) { |
| write(b, 0, b.length); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) { |
| buffer.write(b, off, len); |
| } |
| |
| @Override |
| public void writeInt(int i) { |
| buffer.writeInt(i); |
| } |
| |
| @Override |
| public void write(ByteBuffer bb) { |
| buffer.write(bb, bb.position(), bb.remaining()); |
| } |
| |
| @Override |
| public int buffered() { |
| return buffer.size(); |
| } |
| |
| @Override |
| public DatanodeInfo[] getPipeline() { |
| return new DatanodeInfo[0]; |
| } |
| |
| private void flush0(CompletableFuture<Long> future, ByteArrayOutputStream buffer, boolean sync) { |
| try { |
| if (buffer.size() > 0) { |
| out.write(buffer.getBuffer(), 0, buffer.size()); |
| if (sync) { |
| out.hsync(); |
| } else { |
| out.hflush(); |
| } |
| } |
| future.complete(out.getPos()); |
| } catch (IOException e) { |
| future.completeExceptionally(e); |
| return; |
| } |
| } |
| |
| @Override |
| public CompletableFuture<Long> flush(boolean sync) { |
| CompletableFuture<Long> future = new CompletableFuture<>(); |
| ByteArrayOutputStream buffer = this.buffer; |
| this.buffer = new ByteArrayOutputStream(); |
| executor.execute(() -> flush0(future, buffer, sync)); |
| return future; |
| } |
| |
| @Override |
| public void recoverAndClose(CancelableProgressable reporter) throws IOException { |
| executor.shutdown(); |
| out.close(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| Preconditions.checkState(buffer.size() == 0, "should call flush first before calling close"); |
| executor.shutdown(); |
| out.close(); |
| } |
| |
| @Override |
| public boolean isBroken() { |
| return false; |
| } |
| } |