Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/261#discussion_r63109851
--- 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));
+ }
+ }
+ } catch (IllegalAccessException e) {
+ //Ignore here
+ }
+
+ INPUT_ATTRIBUTES.add(Context.PortContext.PARTITION_PARALLEL);
+ INPUT_ATTRIBUTES.add(Context.PortContext.AUTO_RECORD);
+ INPUT_ATTRIBUTES.add(Context.PortContext.STREAM_CODEC);
+ INPUT_ATTRIBUTES.add(Context.PortContext.TUPLE_CLASS);
+
+
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.QUEUE_CAPACITY);
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.BUFFER_MEMORY_MB);
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.SPIN_MILLIS);
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.UNIFIER_SINGLE_FINAL);
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.IS_OUTPUT_UNIFIED);
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.AUTO_RECORD);
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.STREAM_CODEC);
+ OUTPUT_ATTRIBUTES.add(Context.PortContext.TUPLE_CLASS);
+
+ }
+
+ /**
+ * The extension point of the stream
+ *
+ * @param <T>
+ */
+ public static class Brick<T>
+ {
+
+ private Operator.OutputPort<T> lastOutput;
+
+ private DagMeta.NodeMeta nodeMeta;
+
+ private Pair<Operator.OutputPort, Operator.InputPort> lastStream;
+
+ public Operator.OutputPort<T> getLastOutput()
+ {
+ return lastOutput;
+ }
+
+ public void setLastOutput(Operator.OutputPort<T> lastOutput)
+ {
+ this.lastOutput = lastOutput;
+ }
+
+ public void setLastStream(Pair<Operator.OutputPort,
Operator.InputPort> lastStream)
+ {
+ this.lastStream = lastStream;
+ }
+
+ public Pair<Operator.OutputPort, Operator.InputPort> getLastStream()
+ {
+ return lastStream;
+ }
+ }
+
+ /**
+ * Graph behind the stream
+ */
+ private DagMeta graph;
+
+ /**
+ * Right now the stream only support single extend point
+ * You can have multiple downstream operators connect to this single
extend point though
+ */
+ private Brick<T> lastBrick;
+
+ public Brick<T> getLastBrick()
+ {
+ return lastBrick;
+ }
+
+ public void setLastBrick(Brick<T> lastBrick)
+ {
+ this.lastBrick = lastBrick;
+ }
+
+ public ApexStreamImpl()
+ {
+ graph = new DagMeta();
+ }
+
+ public ApexStreamImpl(DagMeta graph)
+ {
+ this(graph, null);
+ }
+
+ public ApexStreamImpl(DagMeta graph, Brick<T> lastBrick)
+ {
+ this.graph = graph;
+ this.lastBrick = lastBrick;
+ }
+
+ @Override
+ public <O> ApexStream<O> map(Function.MapFunction<T, O> mf)
+ {
+ return map(mf.toString(), mf);
+ }
+
+ @Override
+ public <O> ApexStream<O> map(String name, Function.MapFunction<T, O> mf)
+ {
+ FunctionOperator.MapFunctionOperator<T, O> opt = new
FunctionOperator.MapFunctionOperator<>(mf);
+ return addOperator(name, opt, opt.input, opt.output);
+ }
+
+ @Override
+ public <O> ApexStream<O> flatMap(Function.FlatMapFunction<T, O> flatten)
+ {
+ return flatMap(flatten.toString(), flatten);
+ }
+
+ @Override
+ public <O> ApexStream<O> flatMap(String name,
Function.FlatMapFunction<T, O> flatten)
+ {
+ FunctionOperator.MapFunctionOperator<T, Iterable<O>> opt = new
FunctionOperator.MapFunctionOperator<>(flatten);
+ return addOperator(name, opt, opt.input, opt.output);
+ }
+
+ @Override
+ public ApexStream<T> filter(final Function.FilterFunction<T> filter)
+ {
+ return filter(filter.toString(), filter);
+ }
+
+ @Override
+ public ApexStream<T> filter(String name, final
Function.FilterFunction<T> filter)
+ {
+ FunctionOperator.FilterFunctionOperator<T> filterFunctionOperator =
new FunctionOperator.FilterFunctionOperator<>(filter);
+ return addOperator(name, filterFunctionOperator,
(DefaultInputPort<T>)filterFunctionOperator.in,
(DefaultOutputPort<T>)filterFunctionOperator.out);
+ }
+
+ @Override
+ public ApexStream<T> reduce(Function.ReduceFunction reduce)
+ {
+ return reduce(reduce.toString(), reduce);
+ }
+
+ @Override
+ public ApexStream<T> reduce(String name, Function.ReduceFunction reduce)
+ {
+ FunctionOperator.ReduceFunctionOperator<T> opt = new
FunctionOperator.ReduceFunctionOperator<>(reduce);
+ return addOperator(name, opt, opt.input, opt.output);
+ }
+
+ @Override
+ public <O> ApexStream<O> fold(final O initialValue,
Function.FoldFunction fold)
+ {
+ return fold(fold.toString(), initialValue, fold);
+ }
+
+ @Override
+ public <O> ApexStream<O> fold(String name, O initialValue,
Function.FoldFunction fold)
+ {
+ FunctionOperator.FoldFunctionOperator<T, O> opt = new
FunctionOperator.FoldFunctionOperator<>(fold, initialValue);
+ return addOperator(name, opt, opt.input, opt.output);
+ }
+
+ @Override
+ public ApexStream<Integer> count()
+ {
+ return null;
+ }
+
+ @Override
+ public <O> ApexStream<Map<O, Integer>> countByKey(int key)
+ {
+ return null;
+ }
+
+ @Override
+ public ApexStream<HashMap<T, Integer>> countByKey()
+ {
+ // Needs to change the unique counter to support keys
+ UniqueCounter<T> uniqueCounter = new UniqueCounter<>();
+ uniqueCounter.setCumulative(true);
+ return addOperator("CounterByKey", uniqueCounter, uniqueCounter.data,
uniqueCounter.count);
+ }
+
+ @Override
+ public <O> ApexStream<O> addOperator(Operator op, Operator.InputPort<T>
inputPort, Operator.OutputPort<O> outputPort)
+ {
+ return addOperator(op.toString(), op, inputPort, outputPort);
+ }
+
+
+ public <O> ApexStream<O> addOperator(String opName, Operator op,
Operator.InputPort<T> inputPort, Operator.OutputPort<O> outputPort)
+ {
+ checkArguments(op, inputPort, outputPort);
+
+ DagMeta.NodeMeta nm = null;
+
+ if (lastBrick == null) {
+ nm = graph.addNode(opName, op, null, null, inputPort);
+ } else {
+
+ nm = graph.addNode(opName, op, lastBrick.nodeMeta,
lastBrick.lastOutput, inputPort);
+ }
+
+ Brick<O> newBrick = new Brick<>();
+ newBrick.nodeMeta = nm;
+ newBrick.setLastOutput(outputPort);
+ if (lastBrick != null) {
+ newBrick.lastStream = Pair.<Operator.OutputPort,
Operator.InputPort>of(lastBrick.lastOutput, inputPort);
+ }
+ return new ApexStreamImpl<>(this.graph, newBrick);
+ }
+
+ /* Check to see if inputPort and outputPort belongs to the operator */
+ private void checkArguments(Operator op, Operator.InputPort inputPort,
Operator.OutputPort outputPort)
+ {
+ if (op == null) {
+ throw new IllegalArgumentException("Operator can not be null");
+ }
+
+ boolean foundInput = inputPort == null;
+ boolean foundOutput = outputPort == null;
+ for (Field f : op.getClass().getFields()) {
+ int modifiers = f.getModifiers();
+ if (!Modifier.isPublic(modifiers) ||
!Modifier.isTransient(modifiers)) {
+ continue;
+ }
+ Object obj = null;
+ try {
+ obj = f.get(op);
+ } catch (IllegalAccessException e) {
+ // NonAccessible field is not a valid port object
+ }
+ if (obj == outputPort) {
+ foundOutput = true;
+ }
+ if (obj == inputPort) {
+ foundInput = true;
+ }
+ }
+ if (!foundInput || !foundOutput) {
+ throw new IllegalArgumentException("Input port " + inputPort + "
and/or Output port " + outputPort + " is/are not owned by Operator " + op);
+ }
+
+ }
+
+ @Override
+ public ApexStream<T> union(ApexStream<T>... others)
+ {
+ return null;
--- End diff --
should probably throw a NotSupportedException instead of returning null.
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