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https://issues.apache.org/jira/browse/BEAM-6857?focusedWorklogId=372821&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-372821
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ASF GitHub Bot logged work on BEAM-6857:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 16/Jan/20 06:40
            Start Date: 16/Jan/20 06:40
    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-575007454
 
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 372821)
    Time Spent: 19h 50m  (was: 19h 40m)

> 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: 19h 50m
>  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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