corner.services.hadoop.impl.HdfsAccessorProxy.java Source code

Introduction

Here is the source code for corner.services.hadoop.impl.HdfsAccessorProxy.java

Source

/* 
 * Copyright 2008 The Corner Team.
 * 
 * Licensed 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 corner.services.hadoop.impl;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Timestamp;
import java.util.LinkedList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
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.io.IOUtils;

import corner.services.hadoop.FileDesc;

/**
 * Hdfs?
 * 
 * @author jcai
 * @version $Revision$
 * @since 0.0.2
 */
public class HdfsAccessorProxy implements AccessorProxy {
    private Configuration conf;

    public HdfsAccessorProxy(Configuration conf) {
        this.conf = conf;
    }

    /**
     * @see corner.services.hadoop.DistributedResourceAccessor#getFile(java.lang.String,
     *      java.io.OutputStream)
     */
    public void getFile(String filePath, OutputStream out) throws IOException {
        Path srcPath = new Path(filePath);
        FileSystem srcFS = srcPath.getFileSystem(getConf());
        InputStream in = srcFS.open(srcPath);
        IOUtils.copyBytes(in, out, getConf());
    }

    Configuration getConf() {
        return this.conf;
    }

    public long getFileMTTime(String filePath) throws IOException {
        Path srcPath = new Path(filePath);
        FileSystem srcFS = srcPath.getFileSystem(getConf());
        if (srcFS != null) {
            return srcFS.getFileStatus(srcPath).getModificationTime();
        } else {
            return -1;
        }
    }

    /**
     * @see corner.services.hadoop.DistributedResourceAccessor#putFile(java.lang.String,
     *      java.io.InputStream)
     */
    public void putFile(String filePath, InputStream is) throws IOException {
        Path dstPath = new Path(filePath);
        FileSystem dstFs = dstPath.getFileSystem(getConf());
        FSDataOutputStream out = dstFs.create(dstPath);
        try {
            IOUtils.copyBytes(is, out, getConf(), false);
        } finally {
            out.close();
        }
    }

    /**
     * 
     * @see corner.services.hadoop.impl.AccessorProxy#deleteFile(java.lang.String)
     */
    @Override
    public boolean deleteFile(String filePath) throws IOException {
        Path dstPath = new Path(filePath);
        FileSystem dstFs = dstPath.getFileSystem(getConf());
        return dstFs.delete(dstPath, false);
    }

    @Override
    public List<FileDesc> list(final String path) throws IOException {
        String _path = path;
        if (path.endsWith("/")) {
            _path = path.substring(0, path.length() - 1);
        }
        Path dstPath = new Path(_path);
        FileSystem dstFs = dstPath.getFileSystem(getConf());
        FileStatus _dstStatus = dstFs.getFileStatus(dstPath);
        if (_dstStatus == null) {
            throw new IllegalArgumentException("The path [" + path + "] dose not exist.");
        }
        if (!_dstStatus.isDir()) {
            throw new IllegalArgumentException("The path [" + path + "] is not dir.");
        }
        FileStatus[] fileStatus = dstFs.listStatus(dstPath);
        if (fileStatus != null && fileStatus.length > 0) {
            List<FileDesc> ret = new LinkedList<FileDesc>();
            for (FileStatus status : fileStatus) {
                ret.add(new FileDesc(_path + "/" + status.getPath().getName(), status.isDir(),
                        new Timestamp(status.getModificationTime()), status.getLen()));
            }
            return ret;
        }
        return null;
    }

    @Override
    public boolean mkdirs(String dirPath) throws IOException {
        Path dstPath = new Path(dirPath);
        FileSystem dstFs = dstPath.getFileSystem(getConf());
        return dstFs.mkdirs(dstPath);
    }

    @Override
    public boolean isFileExist(String filePath) throws IOException {
        Path dstPath = new Path(filePath);
        FileSystem dstFs = dstPath.getFileSystem(getConf());
        return dstFs.exists(dstPath);
    }

    @Override
    public FileDesc getFileDesc(String filePath) throws IOException {
        Path srcPath = new Path(filePath);
        FileSystem srcFS = srcPath.getFileSystem(getConf());
        FileStatus _status = srcFS.getFileStatus(srcPath);
        if (_status != null) {
            return new FileDesc(filePath, _status.isDir(), new Timestamp(_status.getModificationTime()),
                    _status.getLen());
        } else {
            return null;
        }
    }
}