Thanks a lot Kostas. This solved my problem. Thanks and Regards,Piyush
Shrivastava
http://webograffiti.com
On Monday, 25 April 2016 3:27 PM, Kostas Kloudas
<k.klou...@data-artisans.com> wrote:
Hi,
Let me also add that you should also override the clear() method in order to
clear you state.and delete the pending timers.
Kostas
On Apr 25, 2016, at 11:52 AM, Kostas Kloudas <k.klou...@data-artisans.com>
wrote:
Hi Piyush,
In the onElement function, you register a timer every time you receive an
element.
When the next watermark arrives, in the flag==false case, this will lead to
every element adding a timer for its timestamp+60000ms. The same for flag==true
case, with 20000ms interval.
What you can try is to set only once, at the first element the initial trigger
for 60 sec, and then just set all the rest in the on the onEventTime with 20
sec.
To have a look at a custom trigger you can look at
here:https://github.com/kl0u/flink-examples/blob/master/src/main/java/com/dataartisans/flinksolo/beam_comparison/customTriggers/EventTimeTriggerWithEarlyAndLateFiring.java
I hope this helped.Let me know if you need any help.
Kostas
On Apr 25, 2016, at 11:22 AM, Piyush Shrivastava <piyush...@yahoo.co.in> wrote:
Hi all,I want to implement a custom Trigger which fired a GlobalWindow in 1
minute for the first time and every 20 seconds after that.I believe I cannot
get this logic right in the implementation of my custom Trigger. Please help me
with this.
Here is the code of my custom Trigger:
public class TradeTrigger<W extends Window> extends Trigger<Object, W> {
/**
*
*/
private static final long serialVersionUID = 1L;
private TradeTrigger() {
}
@Override
public TriggerResult onElement(
Object element,
long timestamp,
W window,
org.apache.flink.streaming.api.windowing.triggers.Trigger.TriggerContext ctx)
throws Exception {
ctx.registerEventTimeTimer(timestamp);
return TriggerResult.CONTINUE;
}
@Override
public TriggerResult onEventTime(
long timestamp,
W window,
org.apache.flink.streaming.api.windowing.triggers.Trigger.TriggerContext ctx)
throws Exception {
ValueState<Boolean> state = ctx.getPartitionedState(new
ValueStateDescriptor<Boolean>("flag", Boolean.TYPE, false));
if(state.value()==false){
ctx.registerEventTimeTimer(timestamp+60000);
state.update(true);
return TriggerResult.FIRE;
}else{
System.out.println(""+state.value());
ctx.registerEventTimeTimer(timestamp+20000);
return TriggerResult.FIRE;
}
}
@Override
public TriggerResult onProcessingTime(
long arg0,
W arg1,
org.apache.flink.streaming.api.windowing.triggers.Trigger.TriggerContext arg2)
throws Exception {
// TODO Auto-generated method stub
return TriggerResult.CONTINUE;
}
public static <W extends Window> TradeTrigger<W> of() {
return new TradeTrigger<>();
}
}
Thanks and Regards,Piyush Shrivastava
http://webograffiti.com
