# Is it possible to write an event listener? **URL:** \ **Category:** Elasticsearch\ **Created:** [December 25, 2018, 8:10pm UTC](https://discuss.elastic.co/t/is-it-possible-to-write-an-event-listener/162085 "2018-12-25T20:10:06Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![asnar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/asnar/32/39207_2.png) [@asnar](https://discuss.elastic.co/u/asnar)\ **Post date:** [December 25, 2018, 8:10pm UTC](https://discuss.elastic.co/t/is-it-possible-to-write-an-event-listener/162085/1 "2018-12-25T20:10:06Z")
Is it possible to write an event listener ? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [December 25, 2018, 8:47pm UTC](https://discuss.elastic.co/t/is-it-possible-to-write-an-event-listener/162085/2 "2018-12-25T20:47:48Z")
I think there are some of them in the source code which are listening to cluster state events for example. What do you want to do ? ---
**Author:** ![asnar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/asnar/32/39207_2.png) [@asnar](https://discuss.elastic.co/u/asnar)\ **Post date:** [December 26, 2018, 4:35am UTC](https://discuss.elastic.co/t/is-it-possible-to-write-an-event-listener/162085/3 "2018-12-26T04:35:48Z")
I am writing a custom watcher, need to implement event based trigger for it. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [January 23, 2019, 4:35am UTC](https://discuss.elastic.co/t/is-it-possible-to-write-an-event-listener/162085/4 "2019-01-23T04:35:50Z")
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