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From "John McCarthy (JIRA)" <>
Subject [jira] Updated: (AMQ-2849) Fanout: unable to apply parameters to discovered brokers
Date Fri, 23 Jul 2010 22:36:51 GMT


John McCarthy updated AMQ-2849:

    Attachment: FanoutTransportFactory_apply_DiscoveryTransport_params.patch

Proposed solution

> Fanout: unable to apply parameters to discovered brokers
> --------------------------------------------------------
>                 Key: AMQ-2849
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Transport
>    Affects Versions: 5.3.2
>            Reporter: John McCarthy
>         Attachments: FanoutTransportFactory_apply_DiscoveryTransport_params.patch
> There is currently no way to apply parameters to discovered brokers when using the fanout
transport.  The discovery transport allows this by calling {{DiscoveryTransport.setParameters(Map)}}
in {{DiscoveryTransportFactory.createTransport(CompositeData)}}.  For example, the following
URI would apply a connection timeout of 3 seconds to all discovered TCP transport brokers,
> &nbsp;&nbsp;&nbsp;&nbsp;{{discovery:(multicast://default)?connectionTimeout=3000}}
> The corresponding fanout URI would not apply the connection timeout to discovered TCP
> &nbsp;&nbsp;&nbsp;&nbsp;{{fanout:(multicast://default)?connectionTimeout=3000}}
> This functionality is requested as discovered brokers may become unreachable.  In those
circumstances, the default 30 connection timeout for the TCP transport can cause a considerable
> The attached patch is a proposed solution where both transports that use the discovery
transport, failover and fanout, have a common code path in {{DiscoveryTransportFactory}} for
creating a discovery transport.  This code path sets the parameters consistently for both
transports.  (Although it relies on a new static method in {{DiscoveryTansportFactory}} and
{{TransportFactory}} objects do not have static methods, {{FanoutTransportFactory}} was already
making a static call to {{DiscoveryAgentFactory}}).  The patch also has two new test cases,
one for apply parameters and another for a minor fix where {{DiscoveryTransport}} should cache
the added URI after the parameters are applied so that the same URI is removed in {{onServiceRemove()}}.
> This issue is created after discussion on the ActiveMQ Users discussion board,
> &nbsp;&nbsp;&nbsp;&nbsp;[]

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