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https://issues.apache.org/jira/browse/TWILL-240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16120604#comment-16120604
]
ASF GitHub Bot commented on TWILL-240:
--------------------------------------
Github user chtyim commented on a diff in the pull request:
https://github.com/apache/twill/pull/58#discussion_r132296480
--- Diff:
twill-yarn/src/main/java/org/apache/twill/internal/appmaster/ApplicationMasterService.java
---
@@ -193,7 +200,91 @@ private EventHandler
createEventHandler(TwillSpecification twillSpec) throws Cla
Preconditions.checkArgument(EventHandler.class.isAssignableFrom(handlerClass),
"Class {} does not implements {}",
handlerClass,
EventHandler.class.getName());
- return Instances.newInstance((Class<? extends EventHandler>)
handlerClass);
+ final EventHandler delegate = Instances.newInstance((Class<? extends
EventHandler>) handlerClass);
+ if (delegate == null) {
+ // if no handler is specified, return an EventHandler with no-op
+ return new EventHandler() {};
+ }
+ // wrap the delegate EventHandler so that all errors will be caught
+ return new EventHandler() {
+
+ @Override
+ public void started() {
+ try {
+ delegate.started();
+ } catch (Throwable t) {
+ LOG.warn("Exception when calling {}.started()",
eventHandler.getClass().getName(), t);
--- End diff --
Shouldn't it be `delegate.getClass().getName()`??
> Improve EventHandler to handle more application lifecycle events
> ----------------------------------------------------------------
>
> Key: TWILL-240
> URL: https://issues.apache.org/jira/browse/TWILL-240
> Project: Apache Twill
> Issue Type: New Feature
> Reporter: Chengfeng Mao
> Assignee: Chengfeng Mao
> Fix For: 0.12.0
>
>
> Application Master should be able to run application specific code when
> certain lifecycle events happen by calling methods from EventHandler. For
> instance, when the app first starts, completes, aborts and etc.
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