On 05/02/14 6:14 AM, "Prachi Damle" <prachi.da...@citrix.com> wrote:
>Murali, > >Also we already have a MessageBus being used at couple of places to >publish messages to other components about certain scenario. >e.g: When reserved capacity for a VM that is stopped for time greater >than configured threshold is freed up, CapacityManager publishes a >message that is being subscribed to by the DeploymentPlanningManager. > >How do we differentiate between the MessageBus Vs EventBus usecases, when >should we use one Vs the other? Both are designed with different goals. Please see thread [1]. MessageBus acts as generic transport abstraction to build IPC between the components. Event bus has specific use case of enabling CloudStack components or external system to publish-subscribe CloudStack events. I guess which one to use depends on the use case. If some functionality can be achieved just by consuming action/usage/sate change/alert events generated then event bus should be good enough. [1] http://markmail.org/message/cebk4cyvbdufyrkr > >Prachi > >-----Original Message----- >From: Nitin Mehta [mailto:nitin.me...@citrix.com] >Sent: Tuesday, February 04, 2014 1:34 PM >To: dev@cloudstack.apache.org >Cc: Murali Reddy >Subject: Re: Run In memory event bus by default > >Please find my answers inline. > >On 04/02/14 11:04 AM, "Chiradeep Vittal" <chiradeep.vit...@citrix.com> >wrote: > >>Do you mean, "can we start it by default"? > >Yes. > >>Does it work for clustered management servers? > >Probably Murali who is the author can better answer this. >But for my use case where I want to listen to the action events, its fine >to subscribe in all the instances of MS and take appropriate action. > > >> >>On 2/3/14 11:25 AM, "Nitin Mehta" <nitin.me...@citrix.com> wrote: >> >>>I see that in memory event bus got checked in recently. I understand >>>that its a plugin, but can we not start it by default ? >>>It would help different components (for example - monitoring system, >>>usage etc.) within CS to subscribe to events and take some useful >>>action based on them if they could assume that some event bus were >>>running by default. >>> >>>Thanks, >>>-Nitin >> > >
