org.cloudata.core.client.blob.CBlobOutputStream.java Source code

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Here is the source code for org.cloudata.core.client.blob.CBlobOutputStream.java

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/**
 * 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.cloudata.core.client.blob;

import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.util.Random;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.cloudata.core.common.Constants;
import org.cloudata.core.common.conf.CloudataConf;
import org.cloudata.core.fs.CloudataFileSystem;
import org.cloudata.core.fs.GPath;

/**
 * @author jindolk
 * USER_TABLE.COLUMN: CK=cellKey, VALUE=path + offset + length
 * BLOB.RK: path
 * BLOB.OFFSET: CK=offset, VALUE=usertable.name+rowKey+column+cellKey
 * BLOB.LOCK: CK=lock count, VALUE=null
 * BLOB.DELETED: CK=offset, VALUE=Y/N
 */
public class CBlobOutputStream extends OutputStream implements Constants {
    private static final Log LOG = LogFactory.getLog(CBlobOutputStream.class.getName());

    //static final DecimalFormat SEQ_DF = new DecimalFormat("00000");

    public static final DecimalFormat OFFSET_DF = new DecimalFormat("00000000000000000000");

    private CloudataConf conf;
    private BlobMetaCell blobMetaCell;

    private String tempFile;
    private String fileName;
    private OutputStream out;
    private CloudataFileSystem fs;
    private long length;

    public CBlobOutputStream(CloudataConf conf, BlobMetaCell blobMetaCell) throws IOException {
        this.conf = conf;
        this.blobMetaCell = blobMetaCell;

        this.fs = CloudataFileSystem.get(conf);

        Random rand = new Random(System.currentTimeMillis());

        this.fileName = System.currentTimeMillis() + System.nanoTime() + blobMetaCell.toString().hashCode() + ""
                + rand.nextInt();

        GPath parentPath = new GPath(
                BlobMetaManager.getBlobTempPath(conf, blobMetaCell.getTableName(), blobMetaCell.getColumnName()));
        fs.mkdirs(parentPath);

        tempFile = parentPath + "/" + fileName;

        //LOG.info("Output Open:" + tempFile);
        this.out = fs.create(new GPath(tempFile));
    }

    @Override
    public void write(int b) throws IOException {
        out.write(b);
    }

    @Override
    public void close() throws IOException {
        //LOG.info("Output close:" + tempFile);

        out.close();

        GPath parentPath = new GPath(
                BlobMetaManager.getBlobRootPath(conf, blobMetaCell.getTableName(), blobMetaCell.getColumnName()));
        fs.mkdirs(parentPath);

        GPath targetPath = new GPath(parentPath, fileName);

        fs.move(new GPath(tempFile), targetPath);

        length = fs.getLength(targetPath);

        //System.out.println("length>>>>>>>>>>>>>" + targetPath + ">" + length);
        blobMetaCell.setLength(length);

        BlobColumnCell blobColumnCell = new BlobColumnCell(targetPath.toString(), 0L, length);

        BlobMetaManager.saveBlobMetaCell(conf, blobMetaCell, blobColumnCell);
        BlobMetaManager.saveBlobColumnCell(conf, blobMetaCell, blobColumnCell);
    }

    @Override
    public void flush() throws IOException {
        out.flush();
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        out.write(b, off, len);
    }

    @Override
    public void write(byte[] b) throws IOException {
        out.write(b);
    }

    public long getLength() {
        return length;
    }
}