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https://issues.apache.org/jira/browse/STORM-1167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15021735#comment-15021735
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ASF GitHub Bot commented on STORM-1167:
---------------------------------------
Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/855#discussion_r45579748
--- Diff: storm-core/src/jvm/backtype/storm/windowing/EventImpl.java ---
@@ -0,0 +1,38 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
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+ * to you under the Apache License, Version 2.0 (the
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+package backtype.storm.windowing;
+
+class EventImpl<T> implements Event<T> {
--- End diff --
Agree with your comments for value types and final classes. When I wrote, I
was not sure whether we would need another implementation and it turns out that
we need another implementation (watermark events) for tracking tuple timestamps.
If unsure I feel it might be better to err by having interfaces. It makes
it easier to write mock implementation for testing and makes the apis more
readable without cluttering with the implementation details. (see below link
for more details).
http://programmers.stackexchange.com/questions/159813/do-i-need-to-use-an-interface-when-only-one-class-will-ever-implement-it/159909#159909
> Add sliding & tumbling window support for core storm
> ----------------------------------------------------
>
> Key: STORM-1167
> URL: https://issues.apache.org/jira/browse/STORM-1167
> Project: Apache Storm
> Issue Type: Improvement
> Reporter: Arun Mahadevan
> Assignee: Arun Mahadevan
>
> Currently, topologies that needs windowing support requires writing custom
> logic inside bolts making it tedious to handle the windowing and acking logic
> with custom logic.
> We can add framework level support to core storm bolts to process tuples in a
> time or a count based window. Sliding and tumbling windows can be supported.
> Later this can be extended to trident apis as well.
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