hadoop FsUrlConnection 源码
haddop FsUrlConnection 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FsUrlConnection.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;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.Preconditions;
/**
* Representation of a URL connection to open InputStreams.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
class FsUrlConnection extends URLConnection {
private static final Logger LOG =
LoggerFactory.getLogger(FsUrlConnection.class);
private Configuration conf;
private InputStream is;
FsUrlConnection(Configuration conf, URL url) {
super(url);
Preconditions.checkArgument(conf != null, "null conf argument");
Preconditions.checkArgument(url != null, "null url argument");
this.conf = conf;
}
@Override
public void connect() throws IOException {
Preconditions.checkState(is == null, "Already connected");
try {
LOG.debug("Connecting to {}", url);
URI uri = url.toURI();
FileSystem fs = FileSystem.get(uri, conf);
// URI#getPath returns null value if path contains relative path
// i.e file:root/dir1/file1
// So path can not be constructed from URI.
// We can only use schema specific part in URI.
// Uri#isOpaque return true if path is relative.
if(uri.isOpaque() && uri.getScheme().equals("file")) {
is = fs.open(new Path(uri.getSchemeSpecificPart()));
} else {
is = fs.open(new Path(uri));
}
} catch (URISyntaxException e) {
throw new IOException(e.toString());
}
}
@Override
public InputStream getInputStream() throws IOException {
if (is == null) {
connect();
}
return is;
}
}
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