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https://issues.apache.org/jira/browse/BEAM-6857?focusedWorklogId=364961&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-364961
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ASF GitHub Bot logged work on BEAM-6857:
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Author: ASF GitHub Bot
Created on: 31/Dec/19 11:10
Start Date: 31/Dec/19 11:10
Worklog Time Spent: 10m
Work Description: rehmanmuradali commented on issue #10316: [BEAM-6857]
Support Dynamic Timers
URL: https://github.com/apache/beam/pull/10316#issuecomment-569911344
@reuvenlax , rebasing complete
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Issue Time Tracking
-------------------
Worklog Id: (was: 364961)
Time Spent: 3.5h (was: 3h 20m)
> Support dynamic timers
> ----------------------
>
> Key: BEAM-6857
> URL: https://issues.apache.org/jira/browse/BEAM-6857
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Reuven Lax
> Assignee: Shehzaad Nakhoda
> Priority: Major
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> The Beam timers API currently requires each timer to be statically specified
> in the DoFn. The user must provide a separate callback method per timer. For
> example:
>
> {code:java}
> DoFn<String, String>()
> {
> @TimerId("timer1")
> private final TimerSpec timer1 = TimerSpecs.timer(...);
> @TimerId("timer2")
> private final TimerSpec timer2 = TimerSpecs.timer(...);
> ...... set timers in processElement
> @OnTimer("timer1")
> public void onTimer1() { .....}
> @OnTimer("timer2")
> public void onTimer2() {....}
> }
> {code}
>
> However there are many cases where the user does not know the set of timers
> statically when writing their code. This happens when the timer tag should be
> based on the data. It also happens when writing a DSL on top of Beam, where
> the DSL author has to create DoFns but does not know statically which timers
> their users will want to set (e.g. Scio).
>
> The goal is to support dynamic timers. Something as follows;
>
> {code:java}
> DoFn<String, String>()
> {
> @TimerId("timer")
> private final TimerSpec timer1 = TimerSpecs.dynamicTimer(...);
> @ProcessElement process(@TimerId("timer") DynamicTimer timer)
> {
> timer.set("tag1'", ts);
> timer.set("tag2", ts);
> }
> @OnTimer("timer")
> public void onTimer1(@TimerTag String tag) { .....}
> }
> {code}
>
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