hadoop InputStreamEntity 源码
haddop InputStreamEntity 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/wsrs/InputStreamEntity.java
/**
* 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.lib.wsrs;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.http.server.FSOperations;
import org.apache.hadoop.fs.http.server.HttpFSServerWebApp;
import org.apache.hadoop.fs.http.server.metrics.HttpFSServerMetrics;
import org.apache.hadoop.io.IOUtils;
import javax.ws.rs.core.StreamingOutput;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@InterfaceAudience.Private
public class InputStreamEntity implements StreamingOutput {
private InputStream is;
private long offset;
private long len;
public InputStreamEntity(InputStream is, long offset, long len) {
this.is = is;
this.offset = offset;
this.len = len;
}
public InputStreamEntity(InputStream is) {
this(is, 0, -1);
}
@Override
public void write(OutputStream os) throws IOException {
IOUtils.skipFully(is, offset);
long bytes = 0L;
if (len == -1) {
// Use the configured buffer size instead of hardcoding to 4k
bytes = FSOperations.copyBytes(is, os);
} else {
bytes = FSOperations.copyBytes(is, os, len);
}
// Update metrics.
HttpFSServerMetrics metrics = HttpFSServerWebApp.get().getMetrics();
if (metrics != null) {
metrics.incrBytesRead(bytes);
}
}
}
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