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https://issues.apache.org/jira/browse/APEXMALHAR-1897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15202901#comment-15202901
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ASF GitHub Bot commented on APEXMALHAR-1897:
--------------------------------------------
Github user chandnisingh commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/145#discussion_r56752821
--- Diff:
library/src/main/java/com/datatorrent/lib/state/BucketedState.java ---
@@ -29,11 +31,17 @@
public interface BucketedState
{
/**
+ * An expired value. In some implementations where bucketId is time
related then the event can be old and
+ * the get methods- getSync & getAsync return this special slice
instance.
+ */
+ Slice EXPIRED = new Slice(Ints.toByteArray(-1));
--- End diff --
I can use Slice(null, -1, -1). In the usages, comparisons should be made
using ```==``` and not ```equals```.
For every expired event I didn't want to instantiate a Slice object. So
even if I extend Slice, I will re-use a special instance of slice so thought
why not use just a special instance.
There is a problem with all the approaches I can think of which is that
Slice cannot have an immutable extension because all the members are publicly
exposed without getters and setters.
> Create ManagedState
> -------------------
>
> Key: APEXMALHAR-1897
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-1897
> Project: Apache Apex Malhar
> Issue Type: Sub-task
> Reporter: Chandni Singh
> Assignee: Chandni Singh
> Fix For: 3.4.0
>
>
> ManagedState is described in the document below:
> https://docs.google.com/document/d/1gRWN9ufKSZSZD0N-pthlhpC9TZ8KwJ6hJlAX6nxl5f8/edit#heading=h.z87ti1fwyt0t
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