hadoop AbstractHttpFileSystem 源码
haddop AbstractHttpFileSystem 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/http/AbstractHttpFileSystem.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.fs.http;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonPathCapabilities;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PositionedReadable;
import org.apache.hadoop.fs.Seekable;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.util.Progressable;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URLConnection;
import static org.apache.hadoop.fs.impl.PathCapabilitiesSupport.validatePathCapabilityArgs;
abstract class AbstractHttpFileSystem extends FileSystem {
private static final long DEFAULT_BLOCK_SIZE = 4096;
private static final Path WORKING_DIR = new Path("/");
private URI uri;
@Override
public void initialize(URI name, Configuration conf) throws IOException {
super.initialize(name, conf);
this.uri = name;
}
public abstract String getScheme();
@Override
public URI getUri() {
return uri;
}
@Override
public FSDataInputStream open(Path path, int bufferSize) throws IOException {
URI pathUri = makeQualified(path).toUri();
URLConnection conn = pathUri.toURL().openConnection();
InputStream in = conn.getInputStream();
return new FSDataInputStream(new HttpDataInputStream(in));
}
@Override
public FSDataOutputStream create(Path path, FsPermission fsPermission,
boolean b, int i, short i1, long l,
Progressable progressable)
throws IOException {
throw new UnsupportedOperationException();
}
@Override
public FSDataOutputStream append(Path path, int i, Progressable progressable)
throws IOException {
throw new UnsupportedOperationException();
}
@Override
public boolean rename(Path path, Path path1) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public boolean delete(Path path, boolean b) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public FileStatus[] listStatus(Path path) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public void setWorkingDirectory(Path path) {
}
@Override
public Path getWorkingDirectory() {
return WORKING_DIR;
}
@Override
public boolean mkdirs(Path path, FsPermission fsPermission)
throws IOException {
return false;
}
@Override
public FileStatus getFileStatus(Path path) throws IOException {
return new FileStatus(-1, false, 1, DEFAULT_BLOCK_SIZE, 0, makeQualified(path));
}
/**
* Declare that this filesystem connector is always read only.
* {@inheritDoc}
*/
@Override
public boolean hasPathCapability(final Path path, final String capability)
throws IOException {
switch (validatePathCapabilityArgs(path, capability)) {
case CommonPathCapabilities.FS_READ_ONLY_CONNECTOR:
return true;
default:
return super.hasPathCapability(path, capability);
}
}
private static class HttpDataInputStream extends FilterInputStream
implements Seekable, PositionedReadable {
HttpDataInputStream(InputStream in) {
super(in);
}
@Override
public int read(long position, byte[] buffer, int offset, int length)
throws IOException {
throw new UnsupportedOperationException();
}
@Override
public void readFully(long position, byte[] buffer, int offset, int length)
throws IOException {
throw new UnsupportedOperationException();
}
@Override
public void readFully(long position, byte[] buffer) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public void seek(long pos) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public long getPos() throws IOException {
throw new UnsupportedOperationException();
}
@Override
public boolean seekToNewSource(long targetPos) throws IOException {
throw new UnsupportedOperationException();
}
}
}
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