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From gauravgopi123 <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: SPOI-4520 Implemented Inmemory...
Date Wed, 25 Nov 2015 12:20:36 GMT
Github user gauravgopi123 commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/113#discussion_r45860258
  
    --- Diff: library/src/main/java/com/datatorrent/lib/join/AbstractJoinOperator.java ---
    @@ -0,0 +1,341 @@
    +/*
    + * Copyright (c) 2014 DataTorrent, Inc. ALL Rights Reserved.
    + *
    + * 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 com.datatorrent.lib.join;
    +
    +import java.lang.reflect.Array;
    +import java.util.ArrayList;
    +import java.util.Calendar;
    +import java.util.List;
    +
    +import org.apache.hadoop.classification.InterfaceStability.Evolving;
    +
    +import com.datatorrent.api.Context;
    +import com.datatorrent.api.DefaultInputPort;
    +import com.datatorrent.api.DefaultOutputPort;
    +import com.datatorrent.api.Operator;
    +import com.datatorrent.api.annotation.InputPortFieldAnnotation;
    +import com.datatorrent.common.util.BaseOperator;
    +
    +/**
    + * <p>
    + * This is the base implementation of join operator. Operator receives tuples from multiple
streams,
    + * applies the join operation based on constraint and emit the joined value.
    + * Subclasses should provide implementation to createOutputTuple,copyValue, getKeyValue,
getTime methods.
    + *
    + * <b>Properties:</b><br>
    + * <b>expiryTime</b>: Expiry time for stored tuples<br>
    + * <b>includeFieldStr</b>: List of comma separated fields to be added to
the output tuple.
    + *                         Ex: Field1,Field2;Field3,Field4<br>
    + * <b>keyFields</b>: List of comma separated key field for both the streams.
Ex: Field1,Field2<br>
    + * <b>timeFields</b>: List of comma separated time field for both the streams.
Ex: Field1,Field2<br>
    + * <b>bucketSpanInMillis</b>: Span of each bucket in milliseconds.<br>
    + * <b>strategy</b>: Type of join operation. Default type is inner join<br>
    + * <br>
    + * </p>
    + *
    + * @displayName Abstract Join Operator
    + * @tags join
    + * @since 3.3.0
    + */
    +@Evolving
    +public abstract class AbstractJoinOperator<T> extends BaseOperator implements Operator.CheckpointListener
    +{
    +  public final transient DefaultOutputPort<List<T>> outputPort = new DefaultOutputPort<>();
    +  protected String[] timeFields;
    +
    +  protected String[][] includeFields;
    +  // Fields to compare from both the streams
    +  protected String[] keys;
    +  // Strategy of Join operation, by default the option is inner join
    +  protected JoinStrategy strategy = JoinStrategy.INNER_JOIN;
    +  // This represents whether the processing tuple is from left port or not
    +  protected Boolean isLeft;
    +  @InputPortFieldAnnotation(optional = true)
    --- End diff --
    
    Why are input ports optional? You need atleast two streams to do join


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