io.dstream.tez.utils.HdfsSerializerUtils.java Source code

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Here is the source code for io.dstream.tez.utils.HdfsSerializerUtils.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 io.dstream.tez.utils;

import java.io.InputStream;
import java.io.OutputStream;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import io.dstream.utils.Assert;
import io.dstream.utils.SerializationUtils;

public class HdfsSerializerUtils {

    /**
     * Will serialize object to HDFS returning its {@link Path}.
     *
     * @param source
     * @param fs
     * @param targetPath
     * @return
     */
    public static Path serialize(Object source, FileSystem fs, Path targetPath) {
        Assert.notNull(targetPath, "'targetPath' must not be null");
        Assert.notNull(fs, "'fs' must not be null");
        Assert.notNull(source, "'source' must not be null");

        Path resultPath = targetPath.makeQualified(fs.getUri(), fs.getWorkingDirectory());
        OutputStream targetOutputStream = null;
        try {
            targetOutputStream = fs.create(targetPath);
            SerializationUtils.serialize(source, targetOutputStream);
        } catch (Exception e) {
            throw new IllegalStateException("Failed to serialize " + source + " to " + resultPath, e);
        }
        return resultPath;
    }

    /**
     *
     * @param sourcePath
     * @param fs
     * @param resultType
     * @return
     */
    public static <T> T deserialize(Path sourcePath, FileSystem fs, Class<T> resultType) {
        Assert.notNull(sourcePath, "'sourcePath' must not be null");
        Assert.notNull(fs, "'fs' must not be null");
        Assert.notNull(resultType, "'resultType' must not be null");

        InputStream sourceInputStream = null;
        try {
            sourceInputStream = fs.open(sourcePath);
            T result = SerializationUtils.deserialize(sourceInputStream, resultType);
            return result;
        } catch (Exception e) {
            throw new IllegalStateException(
                    "Failed to de-serialize from " + sourcePath + " object type " + resultType, e);
        }
    }
}