Github user chinmaykolhatkar commented on a diff in the pull request: https://github.com/apache/apex-malhar/pull/330#discussion_r72087671 --- Diff: library/src/main/java/com/datatorrent/lib/join/POJOInnerJoinOperator.java --- @@ -0,0 +1,247 @@ +/** + * 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.join; + +import java.lang.reflect.Array; +import java.util.HashMap; +import java.util.Map; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.apache.commons.lang3.ClassUtils; + +import com.datatorrent.api.Context; +import com.datatorrent.api.DefaultInputPort; +import com.datatorrent.api.DefaultOutputPort; +import com.datatorrent.api.Operator; +import com.datatorrent.api.StreamCodec; +import com.datatorrent.api.annotation.InputPortFieldAnnotation; +import com.datatorrent.api.annotation.OutputPortFieldAnnotation; +import com.datatorrent.lib.util.PojoUtils; + +/** + * Concrete implementation of AbstractManagedStateInnerJoinOperator and receives objects from both streams. + * + * @displayName POJO Inner Join Operator + * @tags join + */ +public class POJOInnerJoinOperator extends AbstractManagedStateInnerJoinOperator<Object,Object> implements Operator.ActivationListener<Context> +{ + private static final transient Logger LOG = LoggerFactory.getLogger(POJOInnerJoinOperator.class); + private transient long timeIncrement; + private transient FieldObjectMap[] inputFieldObjects = (FieldObjectMap[])Array.newInstance(FieldObjectMap.class, 2); + protected Class<?> outputClass; + private long time = System.currentTimeMillis(); + + @OutputPortFieldAnnotation(schemaRequired = true) + public final transient DefaultOutputPort<Object> outputPort = new DefaultOutputPort<Object>() + { + @Override + public void setup(Context.PortContext context) + { + outputClass = context.getValue(Context.PortContext.TUPLE_CLASS); + } + }; + + @InputPortFieldAnnotation(schemaRequired = true) + public transient DefaultInputPort<Object> input1 = new DefaultInputPort<Object>() + { + @Override + public void setup(Context.PortContext context) + { + inputFieldObjects[0].inputClass = context.getValue(Context.PortContext.TUPLE_CLASS); + } + + @Override + public void process(Object tuple) + { + processTuple(tuple,true); + } + + @Override + public StreamCodec<Object> getStreamCodec() + { + return getInnerJoinStreamCodec(true); + } + }; + + @InputPortFieldAnnotation(schemaRequired = true) + public transient DefaultInputPort<Object> input2 = new DefaultInputPort<Object>() + { + @Override + public void setup(Context.PortContext context) + { + inputFieldObjects[1].inputClass = context.getValue(Context.PortContext.TUPLE_CLASS); + } + + @Override + public void process(Object tuple) + { + processTuple(tuple,false); + } + + @Override + public StreamCodec<Object> getStreamCodec() + { + return getInnerJoinStreamCodec(false); + } + }; + + @Override + public void setup(Context.OperatorContext context) + { + timeIncrement = context.getValue(Context.OperatorContext.APPLICATION_WINDOW_COUNT) * + context.getValue(Context.DAGContext.STREAMING_WINDOW_SIZE_MILLIS); + super.setup(context); + for (int i = 0; i < 2; i++) { + inputFieldObjects[i] = new FieldObjectMap(); + } + } + + /** + * Extract the time value from the given tuple + * @param tuple given tuple + * @param isStream1Data Specifies whether the given tuple belongs to stream1 or not. + * @return + */ + @Override + public long extractTime(Object tuple, boolean isStream1Data) + { + return timeFields == null ? time : (long)(isStream1Data ? inputFieldObjects[0].timeFieldGet.get(tuple) : + inputFieldObjects[1].timeFieldGet.get(tuple)); + } + + /** + * Create getters for the key and time fields and setters for the include fields. + */ + protected void generateSettersAndGetters() + { + for (int i = 0; i < 2; i++) { + Class inputClass = inputFieldObjects[i].inputClass; + try { + Class c = ClassUtils.primitiveToWrapper(inputClass.getField(keyFields.get(i)).getType()); + inputFieldObjects[i].keyGet = PojoUtils.createGetter(inputClass, keyFields.get(i), c); + if (timeFields != null && timeFields.size() != 0) { + Class tc = ClassUtils.primitiveToWrapper(inputClass.getField(timeFields.get(i)).getType()); + inputFieldObjects[i].timeFieldGet = PojoUtils.createGetter(inputClass, timeFields.get(i), tc); + } + for (int j = 0; j < includeFields[i].length; j++) { + Class ic = ClassUtils.primitiveToWrapper(inputClass.getField(includeFields[i][j]).getType()); + Class oc = ClassUtils.primitiveToWrapper(outputClass.getField(includeFields[i][j]).getType()); + inputFieldObjects[i].fieldMap.put(PojoUtils.createGetter(inputClass, includeFields[i][j], ic), --- End diff -- If the includeField is present in both input stream tuples and their values are different, what governs which value will be copied to output POJO?
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