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https://issues.apache.org/jira/browse/SYNAPSE-738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031579#comment-13031579
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Udayanga Wickramasinghe commented on SYNAPSE-738:
-------------------------------------------------
included patch for initializing/destroyinh sequence templates at
startup/shutdown
> Function-Templates for Synapse Configuration
> --------------------------------------------
>
> Key: SYNAPSE-738
> URL: https://issues.apache.org/jira/browse/SYNAPSE-738
> Project: Synapse
> Issue Type: New Feature
> Components: Core
> Affects Versions: FUTURE
> Reporter: Udayanga Wickramasinghe
> Attachments: synapse_SYNAPSE-738,
> synapse_SYNAPSE-738_call_tempalate.patch,
> synapse_SYNAPSE-738_config_changes.patch,
> synapse_SYNAPSE-738_config_changes_update.patch,
> synapse_SYNAPSE-738_sequence_template_init_bug_fix.patch,
> synapse_SYNAPSE-738_update.patch, synapse_function_templates.patch
>
>
> Implementing Function templates in Synapse can be used to reduce lot of
> complexity as well as eliminate redundancy at synapse configuration. At the
> moment a large portion of ESB configuration are at the micro level. Because
> of this users have to individually configure each and every mediator to
> achieve some high level task. But what we need is a high level abstraction
> that users can easily use to model such scenarios .
> For example if we consider following scenario ,
> <proxy name="SplitAggregateProxy">
> <target>
> <inSequence>
> <iterate expression="//m0:getQuote/m0:
> request"
> preservePayload="true"
> attachPath="//m0:getQuote"
> xmlns:m0="http://services.samples";>
> <target>
> <sequence>
> <send>
> <endpoint>
> <address
> uri="http://localhost:9000/services/SimpleStockQuoteService"/>
> </endpoint>
> </send>
> </sequence>
> </target>
> </iterate>
> </inSequence>
> <outSequence>
> <aggregate>
> <onComplete expression="//m0:getQuoteResponse"
> xmlns:m0="http://services.samples";>
> <send/>
> </onComplete>
> </aggregate>
> </outSequence>
> </target>
> </proxy>
> Here what user really wants to look at is three configuration parameters ,
> 1. Two XPath expressions
> 2. An endpoint address
> we can hide a lot of this complexity by introducing a 'template'
> configuration that parameterize (like a function does) a known pattern such
> as this one.Parameterization can be done using xpath expressions..
> Function templates will look like following in synapse config,
> 1)
> <template name="[func name]">
> /**parameters for this function template**/
> <parameter name="p1" />*
> /**any sequence**/
> <any sequence>+
> </template>
> -->A Template is an extension of Sequence , hence template body can contain
> any sequence in general
> --> any mediator/comp inside template body can refer to its parameters just
> like a normal function does ,by xpath function scope (ie:-func) variable
> ie:- <aggregate>
> <onComplete xmlns:m0="http://services.samples";
> expression="$func:p2">
> <log level="full" />
> <send/>
> </onComplete>
> </aggregate>
> OR
> <log level="custom">
> <property name="p1-value" expression="$func:p1"/>
> <property name="p2-value"
> expression="get-property('func','p2')"/>
> </log>
>
> 2)To invoke a template in synapse we can define a Invoke mediator which will
> be in the following form. Using a invoke mediator ,from within any sequence
> of Synapse we would be able to execute a template with the passed on values
> for parameters such as p1,p2,etc.... :
> <invoke target="[target func template]">
> <parameter name="p2" value="{any xpath} | plain-value"/>*
> </invoke>
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