Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/316#discussion_r66520504
--- Diff:
library/src/main/java/com/datatorrent/lib/window/WindowOption.java ---
@@ -0,0 +1,143 @@
+package com.datatorrent.lib.window;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ *
+ */
+public abstract class WindowOption
+{
+
+ private TriggerOption[] triggerOptions;
+
+ private AccumulationMode accumulationMode = AccumulationMode.ACCUMULATE;
+
+ private List<Object[]> lateness = new LinkedList<>();
+
+ public static enum AccumulationMode
+ {
+ DISCARD,
+ ACCUMULATE,
+ ACCUMULATE_DELTA
+ }
+
+ public static class GlobalWindow extends WindowOption
+ {
+
+ }
+
+ public static class FixedWindow extends WindowOption
+ {
+ FixedWindow(long quantity, Quantification.Unit unit)
+ {
+ size.add(new Object[]{quantity, unit});
+ }
+
+ FixedWindow(List<Object[]> size)
+ {
+ this.size = size;
+ }
+
+ private List<Object[]> size = new LinkedList<>();
+
+ public SlidingWindow slideBy(long slidingQuantity, Quantification.Unit
slidingUnit)
+ {
+ SlidingWindow sw = new SlidingWindow(this.size);
+ sw.delta.add(new Object[]{slidingQuantity, slidingUnit});
+ return sw;
+ }
+
+ public FixedWindow and(long quantity, Quantification.Unit unit)
+ {
+ size.add(new Object[]{quantity, unit});
+ return this;
+ }
+
+ public List<Object[]> getSize()
+ {
+ return size;
+ }
+ }
+
+ public static class SlidingWindow extends FixedWindow
+ {
+
+ SlidingWindow(List<Object[]> size)
+ {
+ super(size);
+ }
+
+ List<Object[]> delta = new LinkedList<>();
+
+ @Override
+ public SlidingWindow and(long quantity, Quantification.Unit unit)
+ {
+ delta.add(new Object[]{quantity, unit});
+ return this;
+ }
+ }
+
+ public static class SessionWindow extends WindowOption
--- End diff --
These concepts are detailed here:
https://www.oreilly.com/ideas/the-world-beyond-batch-streaming-102
http://www.vldb.org/pvldb/vol8/p1792-Akidau.pdf
It's part of the windowing concept in the Apache Beam API.
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