Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/319#discussion_r68675229
--- Diff:
library/src/main/java/org/apache/apex/malhar/lib/window/TriggerOption.java ---
@@ -0,0 +1,278 @@
+/**
+ * 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.lib.window;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import org.joda.time.Duration;
+
+import org.apache.hadoop.classification.InterfaceStability;
+
+import com.esotericsoftware.kryo.serializers.FieldSerializer;
+import com.esotericsoftware.kryo.serializers.JavaSerializer;
+
+/**
+ * This class describes how triggers should be fired for each window.
+ * For each window, a trigger can be fired before the watermark (EARLY),
at the watermark (ON_TIME), or after the watermark (LATE).
+ * If a LATE trigger is specified and the accumulation mode is
ACCUMULATING, it is important for the WindowOption to
+ * specify the allowed lateness because otherwise, all states must be kept
in storage.
+ *
+ */
+@InterfaceStability.Evolving
+public class TriggerOption
+{
+
+ public enum AccumulationMode
+ {
+ DISCARDING,
+ ACCUMULATING,
+ ACCUMULATING_AND_RETRACTING
+ }
+
+ private AccumulationMode accumulationMode = AccumulationMode.DISCARDING;
+ private boolean firingOnlyUpdatedPanes = false;
+
+ /**
+ * Whether the trigger should be fired before the watermark, at the
watermark, or after the watermark
+ */
+ public enum WatermarkOpt
+ {
+ EARLY,
--- End diff --
We can. @siyuanh any problem with that?
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