Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/319#discussion_r67760438
--- Diff:
stream/src/main/java/org/apache/apex/malhar/stream/window/impl/WindowedOperatorImpl.java
---
@@ -0,0 +1,436 @@
+package org.apache.apex.malhar.stream.window.impl;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+
+import com.datatorrent.api.Context;
+import com.datatorrent.api.DefaultInputPort;
+import com.datatorrent.api.DefaultOutputPort;
+import com.datatorrent.common.util.BaseOperator;
+import com.datatorrent.stram.engine.WindowGenerator;
+import com.datatorrent.stram.plan.logical.LogicalPlan;
+import org.apache.apex.malhar.stream.api.function.Function;
+import org.apache.apex.malhar.stream.window.Accumulation;
+import org.apache.apex.malhar.stream.window.SessionWindowedStorage;
+import org.apache.apex.malhar.stream.window.WindowedStorage;
+import org.apache.apex.malhar.stream.window.TriggerOption;
+import org.apache.apex.malhar.stream.window.Watermark;
+import org.apache.apex.malhar.stream.window.Window;
+import org.apache.apex.malhar.stream.window.WindowOption;
+import org.apache.apex.malhar.stream.window.WindowState;
+import org.apache.apex.malhar.stream.window.WindowedOperator;
+import org.joda.time.Duration;
+
+
+/**
+ * Created by david on 6/13/16.
+ */
+public class WindowedOperatorImpl<InputT, KeyT, AccumT, OutputT>
+ extends BaseOperator implements WindowedOperator<InputT, KeyT, AccumT,
OutputT>
+{
+ // TODO: Need further discussion on the type parameters. InputT and
OuputT may be a watermark, a KV pair, a WindowedValue, or a plain data object
+
+ private WindowOption windowOption;
+ private Accumulation<InputT, AccumT, OutputT> accumulation;
+ private WindowedStorage<KeyT, AccumT> dataStorage;
+ private WindowedStorage<KeyT, AccumT> retractionStorage;
+
+ private TreeMap<Window, WindowState> windowStateMap = new TreeMap<>();
--- End diff --
I have abstracted out the storage for the window state
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