com.splunk.shuttl.archiver.filesystem.hadoop.HadoopArchiveFileSystem.java Source code

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Here is the source code for com.splunk.shuttl.archiver.filesystem.hadoop.HadoopArchiveFileSystem.java

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// 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;
    }
}