| /** |
| * 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.fs.azure; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import org.apache.hadoop.fs.StreamCapabilities; |
| import org.apache.hadoop.fs.Syncable; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| |
| /** |
| * Support the Syncable interface on top of a DataOutputStream. |
| * This allows passing the sync/hflush/hsync calls through to the |
| * wrapped stream passed in to the constructor. This is required |
| * for HBase when wrapping a PageBlobOutputStream used as a write-ahead log. |
| */ |
| public class SyncableDataOutputStream extends DataOutputStream |
| implements Syncable, StreamCapabilities { |
| |
| public SyncableDataOutputStream(OutputStream out) { |
| super(out); |
| } |
| |
| /** |
| * Get a reference to the wrapped output stream. |
| * |
| * @return the underlying output stream |
| */ |
| @InterfaceAudience.LimitedPrivate({"HDFS"}) |
| public OutputStream getOutStream() { |
| return out; |
| } |
| |
| @Override |
| public boolean hasCapability(String capability) { |
| if (out instanceof StreamCapabilities) { |
| return ((StreamCapabilities) out).hasCapability(capability); |
| } |
| return false; |
| } |
| |
| @Override |
| public void sync() throws IOException { |
| } |
| |
| @Override |
| public void hflush() throws IOException { |
| if (out instanceof Syncable) { |
| ((Syncable) out).hflush(); |
| } |
| } |
| |
| @Override |
| public void hsync() throws IOException { |
| if (out instanceof Syncable) { |
| ((Syncable) out).hsync(); |
| } |
| } |
| } |