The Message-Id: header is suppose to be unique for every email. On Mon, Dec 13, 2010 at 8:53 AM, Max <[email protected]> wrote:
> Hi, > > OK, that makes sense. How could I make a GAE mail handler idempotent? Is > there any unique identifier associated with an inbound email that I can > reference, or will I truly need to build the ".equals" logic to analyze the > email elements (including attachments) to know if it is a duplicate? > > thanks > MG > > On Dec 12, 2010, at 11:34 PM, Didier Durand wrote: > > > Hi, > > > > Yes, your code gets (probably) executed more than once because it is > > scheduled as a task in a task queue defined in the architecture of > > GAE. > > > > As such your code as to be idempotent (the word you were looking for) > > because it can be executed multiple times: Google highly recommend to > > guarantee to work on a true idempotence of the code in such cases. > > > > regards > > > > didier > > > > On Dec 12, 10:22 pm, Max <[email protected]> wrote: > >> Hi, > >> > >> My application receives emails and performs duties based on the content > of the email. I'm sometimes having an issue (< 5%) where a single email > that goes in to the application causes the handler to execute twice. Is > this an issue with GAE that would be intended to be fixed? Or is the nature > of the environment one that requires writing code that can be executed > multiple times without negative consequences (can't remember the word for > this)? > >> > >> If I need to write code to support running multiple times over the same > inbound email, are there any suggestions on how to manage this? I'm > assuming I'd need to come up with an ".equals" method that makes sure it > isn't a repeat of a prior message. Any advice? > >> > >> thanks! > >> MG > > > > -- > > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > > To post to this group, send email to > [email protected]. > > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
