1. Messages
  2. Subscription onDestroy Callback

Re: Subscription onDestroy Callback

Sam Wilson <Sam.Wilson@...>
 

Hey Reed,

It does seem like onDestroy is intended to be used that way. When the bridge calls onDestroy, it causes OpenMAMA to switch the subscription's state from any of the "ING" states to the "ED" states, which lets the mama subscription be reused.

If you enqueue the onDestroy, mamaconsumer_v2 will hang while it is cleaning up. It stops the dispatcher with mama_stop, then waits for all the onDestroy events in consumerShutdown. If the dispatcher is stopped, no queued events can be delivered, so no onDestroy calls are made.

Cheers,
Sam


On 15-02-20 12:34 PM, Alpert, Reed wrote:

Hi,

 

Does the onDestroy() guarantee that no more callbacks will be made for that subscription?

Similar to Reuters completion event.

To guarantee this it seems it must be posted as an event on the sub queue, and no more sent after that.

 

For destroy/create use case:

sub->destroy();

wait for onDestroy();

sub->create(>..);

 

What issues did the sample apps have?

 

Thanks,

 

Reed.

 

Reed Alpert | Corporate & Investment Bank | Market Data Services | J.P. Morgan | 4 Metrotech Center, 23rd Floor, Brooklyn, NY 11245 | T: 718.242.5198  | M: 917.414.4613 | reed.alpert@...

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-----Original Message-----
From: openmama-dev-bounces@... [mailto:openmama-dev-bounces@...] On Behalf Of Sam Wilson
Sent: Wednesday, February 18, 2015 3:05 PM
To: openmama-dev@...
Subject: [Openmama-dev] Subscription onDestroy Callback

 

Hey everyone,

 

I spoke quickly with Damien about this on IRC, but I thought I should raise the question with the community at large.

 

What thread should the subscription's onDestroy callback be called from?

We recently switched from calling it on a thread controlled by the bridge to enqueuing it on the subscription's queue, but that seems to cause a lot of trouble for the sample applications.

 

Section 9 of the OpenMAMA Developer's Guide for C leaves out the onDestroy callback.

 

Thanks,

Sam

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