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From siyuanh <...@git.apache.org>
Subject [GitHub] incubator-apex-malhar pull request: Stream API
Date Thu, 12 May 2016 18:37:29 GMT
Github user siyuanh commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/261#discussion_r63073665
  
    --- Diff: stream/src/main/java/org/apache/apex/malhar/stream/api/impl/ApexStreamImpl.java
---
    @@ -0,0 +1,457 @@
    +/**
    + * 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.apache.apex.malhar.stream.api.impl;
    +
    +import java.lang.reflect.Field;
    +import java.lang.reflect.Modifier;
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.LinkedList;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Set;
    +
    +import org.apache.apex.malhar.stream.api.ApexStream;
    +import org.apache.apex.malhar.stream.api.function.Function;
    +import org.apache.apex.malhar.stream.api.operator.FunctionOperator;
    +import org.apache.commons.beanutils.BeanUtils;
    +import org.apache.commons.lang3.tuple.Pair;
    +import org.apache.hadoop.conf.Configuration;
    +
    +import com.datatorrent.api.Attribute;
    +import com.datatorrent.api.Context;
    +import com.datatorrent.api.DAG;
    +import com.datatorrent.api.DefaultInputPort;
    +import com.datatorrent.api.DefaultOutputPort;
    +import com.datatorrent.api.LocalMode;
    +import com.datatorrent.api.Operator;
    +import com.datatorrent.lib.algo.UniqueCounter;
    +import com.datatorrent.lib.io.ConsoleOutputOperator;
    +import com.datatorrent.stram.plan.logical.LogicalPlan;
    +
    +/**
    + * Default stream implementation for ApexStream interface.
    + * It creates the dag(execution plan) from stream api
    + */
    +public class ApexStreamImpl<T> implements ApexStream<T>
    +{
    +
    +  static Set<Attribute> OPERATOR_ATTRIBUTES;
    +
    +  static Set<Attribute> DAG_ATTRIBUTES;
    +
    +  static Set<Attribute> INPUT_ATTRIBUTES;
    +
    +  static Set<Attribute> OUTPUT_ATTRIBUTES;
    +
    +  static {
    +
    +    OPERATOR_ATTRIBUTES = new HashSet<>();
    +    DAG_ATTRIBUTES = new HashSet<>();
    +    INPUT_ATTRIBUTES = new HashSet<>();
    +    OUTPUT_ATTRIBUTES = new HashSet<>();
    +
    +    try {
    +      for (Field field : Context.OperatorContext.class.getDeclaredFields()) {
    +        if (field.getType() == Attribute.class) {
    +          OPERATOR_ATTRIBUTES.add((Attribute)field.get(Context.OperatorContext.class));
    +        }
    +      }
    +
    +      for (Field field : Context.DAGContext.class.getDeclaredFields()) {
    +        if (field.getType() == Attribute.class) {
    +          DAG_ATTRIBUTES.add((Attribute)field.get(Context.DAGContext.class));
    --- End diff --
    
    No, but you can get the dag object and set the attribute there. 


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