Mailing-List: contact dev-help@apex.incubator.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@apex.incubator.apache.org
Date: Thu, 28 Jan 2016 05:13:39 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
To: dev@apex.incubator.apache.org
Message-ID: <JIRA.12933991.1453767340000.232809.1453958019816@Atlassian.JIRA>
In-Reply-To: <JIRA.12933991.1453767340000@Atlassian.JIRA>
References: <JIRA.12933991.1453767340000@Atlassian.JIRA>
 <JIRA.12933991.1453767340329@arcas>
Subject: [jira] [Commented] (APEXMALHAR-1984) Operators that use Kryo
 directly would throw exception in local mode
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/APEXMALHAR-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15120772#comment-15120772 ] 

ASF GitHub Bot commented on APEXMALHAR-1984:
--------------------------------------------

Github user vrozov commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/178#discussion_r51080849
  
    --- Diff: library/src/main/java/com/datatorrent/lib/util/KryoCloneUtils.java ---
    @@ -0,0 +1,153 @@
    +/**
    + * 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 com.datatorrent.lib.util;
    +
    +import java.io.ByteArrayOutputStream;
    +import java.util.ArrayList;
    +import java.util.List;
    +
    +import org.apache.commons.io.IOUtils;
    +
    +import com.esotericsoftware.kryo.Kryo;
    +import com.esotericsoftware.kryo.io.Input;
    +import com.esotericsoftware.kryo.io.Output;
    +
    +/**
    + *
    + * A Kryo Clone Util class that clone object by using Kryo serializer and deserializer
    + * The class has static method that are can be used directly to clone one object
    + * Or it can be used as util instance to clone as many objects as you need from the one source object
    + *
    + * @since 3.4.0
    + */
    +public class KryoCloneUtils<T>
    +{
    +
    +  /**
    +   * Reusable Kryo object as deserializer
    +   */
    +  private final Kryo kryo;
    +
    +  /**
    +   * Reusable binary data for object that would be deserialized from
    +   */
    +  private final byte[] bin;
    +
    +  /**
    +   * The class of the object
    +   */
    +  private final Class<T> clazz;
    +
    +  private KryoCloneUtils(Kryo kryo, T t)
    +  {
    +    this.kryo = kryo;
    +    ByteArrayOutputStream bos = null;
    +    Output output = null;
    +    try {
    +      bos = new ByteArrayOutputStream();
    +      output = new Output(bos);
    +      kryo.writeObject(output, t);
    +      output.close();
    +      bin = bos.toByteArray();
    +    } finally {
    +      IOUtils.closeQuietly(output);
    +      IOUtils.closeQuietly(bos);
    +    }
    +    clazz = (Class<T>)t.getClass();
    +    kryo.setClassLoader(clazz.getClassLoader());
    +  }
    +
    +  /**
    +   * Clone from the binary data of the source object
    +   * @return
    +   */
    +  public T getClone()
    +  {
    +    try (Input input = new Input(bin)) {
    +      return kryo.readObject(input, clazz);
    +    }
    +  }
    +
    +  /**
    +   * Clone array of objects from source object
    +   * @param num
    +   * @return
    +   */
    +  public T[] getClones(int num)
    +  {
    +    List<T> result = new ArrayList<>();
    +    for (int i = 0; i < num; i++) {
    +      result.add(getClone());
    +    }
    +    return (T[])result.toArray();
    +  }
    +
    +
    +
    +  /**
    +   * Clone object by serializing and deserializing using Kryo.
    +   * Note this is different from using {@link Kryo#copy(Object)}, which will attempt to also clone transient fields.
    +   *
    +   * @param kryo kryo object used to clone objects
    +   * @param src src object that copy from
    +   * @return
    +   */
    +  public static <SRC> SRC cloneByKryo(Kryo kryo, SRC src)
    +  {
    +    kryo.setClassLoader(src.getClass().getClassLoader());
    +    ByteArrayOutputStream bos = null;
    +    Output output;
    +    Input input = null;
    +    try {
    +      bos = new ByteArrayOutputStream();
    +      output = new Output(bos);
    +      kryo.writeObject(output, src);
    +      output.close();
    +      input = new Input(bos.toByteArray());
    +      return (SRC)kryo.readObject(input, src.getClass());
    +    } finally {
    +      IOUtils.closeQuietly(input);
    +      IOUtils.closeQuietly(bos);
    +    }
    +  }
    +
    +  /**
    +   * Factory function to return CloneUtils object
    +   * @param template
    +   * @param <SRC>
    +   * @return
    +   */
    +  public static <SRC> KryoCloneUtils<SRC> createCloneUtils(SRC template)
    +  {
    +    return new KryoCloneUtils<SRC>(new Kryo(), template);
    --- End diff --
    
    Delegate to `createCloneUtils(Kryo kryo, ...)`


> Operators that use Kryo directly would throw exception in local mode
> --------------------------------------------------------------------
>
>                 Key: APEXMALHAR-1984
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-1984
>             Project: Apache Apex Malhar
>          Issue Type: Bug
>            Reporter: Siyuan Hua
>            Assignee: Siyuan Hua
>


--
This message was sent by Atlassian JIRA
(v6.3.4#6332)