// Copyright (C) 2011 Splunk Inc.
//
// Splunk Inc. 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 com.splunk.shuttl.archiver.filesystem.hadoop;
import java.io.File;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import org.apache.commons.io.FileUtils;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import com.splunk.shuttl.archiver.filesystem.ArchiveFileSystem;
import com.splunk.shuttl.archiver.filesystem.FileOverwriteException;
import com.splunk.shuttl.archiver.filesystem.transaction.TransactionalFileSystem;
import com.splunk.shuttl.archiver.filesystem.transaction.bucket.BucketTransactionCleaner;
import com.splunk.shuttl.archiver.filesystem.transaction.bucket.TransfersBuckets;
import com.splunk.shuttl.archiver.filesystem.transaction.file.FileTransactionCleaner;
import com.splunk.shuttl.archiver.filesystem.transaction.file.TransfersFiles;
import com.splunk.shuttl.archiver.model.Bucket;
import com.splunk.shuttl.archiver.model.LocalBucket;
public class HadoopArchiveFileSystem implements ArchiveFileSystem,
TransactionalFileSystem {
private final FileSystem hadoopFileSystem;
public HadoopArchiveFileSystem(FileSystem hadoopFileSystem) {
this.hadoopFileSystem = hadoopFileSystem;
}
@Override
public List<String> listPath(String pathToBeListed) throws IOException {
Path hadoopPath = new Path(pathToBeListed);
FileStatus[] fileStatusOfPath = hadoopFileSystem.listStatus(hadoopPath);
if (fileStatusOfPath != null)
return new FileStatusBackedList(fileStatusOfPath);
else
return Collections.emptyList();
}
private void putFile(File src, Path temp, Path dst) throws IOException {
if (hadoopFileSystem.exists(dst))
throw new FileOverwriteException();
hadoopFileSystem.delete(temp, true);
hadoopFileSystem.copyFromLocalFile(new Path(src.getAbsoluteFile().toURI()),
temp);
}
private void getFile(Path src, File temp, File dst) throws IOException {
if (dst.exists())
throw new FileOverwriteException();
FileUtils.deleteDirectory(temp);
hadoopFileSystem.copyToLocalFile(src, new Path(temp.getAbsoluteFile()
.toURI()));
}
@Override
public void mkdirs(String path) throws IOException {
mkdirsWithPath(new Path(path));
}
private void mkdirsWithPath(Path path) throws IOException {
hadoopFileSystem.mkdirs(path);
}
@Override
public void rename(String from, String to) throws IOException {
mkdirsWithPath(new Path(to).getParent());
hadoopFileSystem.rename(new Path(from), new Path(to));
}
@Override
public boolean exists(String path) throws IOException {
return hadoopFileSystem.exists(new Path(path));
}
public void deletePath(String path) {
try {
hadoopFileSystem.delete(new Path(path), true);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public TransfersBuckets getBucketTransferer() {
return new TransfersBuckets() {
@Override
public void put(Bucket bucket, String temp, String dst)
throws IOException {
LocalBucket localBucket = (LocalBucket) bucket;
putFile(localBucket.getDirectory(), new Path(temp), new Path(dst));
}
@Override
public void get(Bucket remoteBucket, File temp, File dst)
throws IOException {
getFile(new Path(remoteBucket.getPath()), temp, dst);
}
};
}
@Override
public TransfersFiles getFileTransferer() {
return new TransfersFiles() {
@Override
public void put(String localData, String temp, String dst)
throws IOException {
putFile(new File(localData), new Path(temp), new Path(dst));
}
@Override
public void get(String remoteData, File temp, File dst)
throws IOException {
getFile(new Path(remoteData), temp, dst);
}
};
}
@Override
public BucketTransactionCleaner getBucketTransactionCleaner() {
return new BucketTransactionCleaner() {
@Override
public void cleanTransaction(Bucket bucket, String temp) {
deletePath(temp);
}
};
}
@Override
public FileTransactionCleaner getFileTransactionCleaner() {
return new FileTransactionCleaner() {
@Override
public void cleanTransaction(String file, String temp) {
deletePath(temp);
}
};
}
public FileSystem getFileSystem() {
return hadoopFileSystem;
}
}