[jboss-jira] [JBoss JIRA] Commented: (EJBTHREE-1844) Retry operations after an EJBTransactionRolledbackException

[Matthias Lanz (JIRA)]

    [ https://jira.jboss.org/jira/browse/EJBTHREE-1844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12470830#action_12470830 ] 

Matthias Lanz commented on EJBTHREE-1844:
-----------------------------------------

Hi Carlo,

sounds very good, exactly what I were looking for :-)

I think this new annotation can be applied as default for all SLSB in ejb3-interceptors-aop.xml, that would be very useful.
If it can be applied to all session beans by default it would be neccessary that "numRetries=0" is a valid value, to disable retry for specific beans.

I wonder how nested session bean calls are handled. I assume this annotation can only have any effect on session bean methods that are starting a new transaction, not using one previously started from the caller?

As a extension in the future it would be nice if one could define any kind of retry-handler; an interface which can be implemented to decide on which exceptions a retry should occur.

Example:
@TransactionRetry(numRetries=4, waitTime=1, waitTimeUnit=TimeUnit.SECONDS, retryHandler=MyPersonalOnlyDeadlockRetryHandler.class) 

and then:

public class MyPersonalOnlyDeadlockRetryHandler implements com.jboss.ejb3.RetryHandler {

  public boolean isRetryable(Exception e) {
    return (e instanceof EJBRolledbackException && e.getCause() instanceof MySqlDeadLockDetectedException);
  }


But that is really a nice-to-have, retries on every error should do no harm.



> Retry operations after an EJBTransactionRolledbackException
> -----------------------------------------------------------
>
>                 Key: EJBTHREE-1844
>                 URL: https://jira.jboss.org/jira/browse/EJBTHREE-1844
>             Project: EJB 3.0
>          Issue Type: Feature Request
>          Components: transactions
>            Reporter: Carlo de Wolf
>            Assignee: Carlo de Wolf
>
> By either annotating a bean or its methods, the applicable methods will retry the operation if an EJBTransactionRolledbackException occurs.
> @TransactionRetry(numRetries=4, waitTime=1, waitTimeUnit=TimeUnit.SECONDS)
> numRetries specifies how many times an operation will be tried.
> waitTime specified the amount of time to wait before retrying with the unit of time specified in waitTimeUnit.
> Default is 3 retries and 1000 milliseconds wait time after an EJBTransactionRolledbackException.

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