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From Supun Kamburugamuva <>
Subject Re: startup order - correct place to start transport listeners
Date Tue, 31 Mar 2009 10:23:21 GMT
Hi Indika,

On Tue, Mar 31, 2009 at 10:02 AM, indika kumara <>wrote:

> If the synapse is run top on axis2 or any other, it should be properly
> initialized and started before initialize synapse.

We are talking about two things here. Initialization and startup. I agree
synapse should inilialize after axis2. Also Synapse should start after
Axis2. But at the moment it seems that Synapse is starting even before it
initializes. The way Synapse is written it is perfectly normal to assume
that it is started when Axis2 is started. But if we do it in the current
way, this assumption is broken and can lead to failures as Eric said. If
Axis2 is initialize properly we can initialize Synapse. As Eric said if both
are successfully initialized we can start Axis2 transports, which
automatically starts Synapse.


> It is a well known
> semantic that system should be in consistent state before use it. You
> can refer [1] and it says why I did.

> The way message get in to synapse and mediation engine (main behavior)
> are two different aspects and definitely should have two different
> decision designs as it is wrong if main behavior depend on other
> behavior.  The starting, shutdown --- simply state (consistent)
> management of mediation should not depend any thing.   Axis2 Hander is
> make way to get message into in to synapse and for good design,
> mediation engine should separate from this design decision. Managing
> mediation engine should be independent from axis2 or any other.
> If it is needed to avoid effect of started listeners if the synapse
> mediation engine started up is failed, then only applicable
> transaction semantic is compensation transaction. In order to enforce
> that, it is needed to properly shutdown listeners, etc --- some how
> need to move into a consistent state before system startup.
> [1]
> Thanks
> Indika
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Software Engineer, WSO2 Inc

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