| /** |
| * 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.hdfs.server.datanode.web.resources; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Type; |
| |
| import javax.ws.rs.core.MediaType; |
| import javax.ws.rs.core.MultivaluedMap; |
| import javax.ws.rs.ext.MessageBodyWriter; |
| import javax.ws.rs.ext.Provider; |
| |
| import org.apache.hadoop.hdfs.DFSClient; |
| import org.apache.hadoop.hdfs.client.HdfsDataInputStream; |
| import org.apache.hadoop.io.IOUtils; |
| |
| /** |
| * A response entity for a HdfsDataInputStream. |
| */ |
| public class OpenEntity { |
| private final HdfsDataInputStream in; |
| private final long length; |
| private final DFSClient dfsclient; |
| |
| OpenEntity(final HdfsDataInputStream in, final long length, |
| final DFSClient dfsclient) { |
| this.in = in; |
| this.length = length; |
| this.dfsclient = dfsclient; |
| } |
| |
| /** |
| * A {@link MessageBodyWriter} for {@link OpenEntity}. |
| */ |
| @Provider |
| public static class Writer implements MessageBodyWriter<OpenEntity> { |
| |
| @Override |
| public boolean isWriteable(Class<?> clazz, Type genericType, |
| Annotation[] annotations, MediaType mediaType) { |
| return clazz == OpenEntity.class |
| && MediaType.APPLICATION_OCTET_STREAM_TYPE.isCompatible(mediaType); |
| } |
| |
| @Override |
| public long getSize(OpenEntity e, Class<?> type, Type genericType, |
| Annotation[] annotations, MediaType mediaType) { |
| return e.length; |
| } |
| |
| @Override |
| public void writeTo(OpenEntity e, Class<?> type, Type genericType, |
| Annotation[] annotations, MediaType mediaType, |
| MultivaluedMap<String, Object> httpHeaders, OutputStream out |
| ) throws IOException { |
| try { |
| IOUtils.copyBytes(e.in, out, e.length, false); |
| } finally { |
| IOUtils.cleanup(DatanodeWebHdfsMethods.LOG, e.in); |
| IOUtils.cleanup(DatanodeWebHdfsMethods.LOG, e.dfsclient); |
| } |
| } |
| } |
| } |