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https://issues.apache.org/jira/browse/TAP5-2838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Weidig resolved TAP5-2838.
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Fix Version/s: 5.10.0
Resolution: Implemented
> Make pipeline structure visible at runtime via toString()
> ---------------------------------------------------------
>
> Key: TAP5-2838
> URL: https://issues.apache.org/jira/browse/TAP5-2838
> Project: Tapestry 5
> Issue Type: Improvement
> Components: tapestry-ioc
> Reporter: Ben Weidig
> Assignee: Ben Weidig
> Priority: Minor
> Fix For: 5.10.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> h2. Context
> {{PipelineBuilder}} creates filter chains using dynamically generated bridge
> proxies.
> Currently, calling {{toString()}} on a bridge returns only a simple
> description (e.g. {{{}<PipelineBridge from (serviceInterface) to
> (filterInterface)>{}}}).
> There's no way to inspect the full pipeline at runtime.
> To provide more insight in what the pipeline actually does, especially how
> the ordering has resolved, pipelines should output the full chain in
> {{toString()}}
> h2. Design
> Dynamically generate a {{toString()}} implementation for bridge instances
> that formats the bridge's filter and recursively invokes {{toString()}} on the
> {{next}} step (either the next bridge or the terminator).
> Calling {{toString()}} on the pipeline head will automatically compose and
> output the complete pipeline chain at runtime, e.g.:
> {noformat}
> <PipelineBridge from (serviceInterface) to (filterInterface):
> com.example.LoggingFilter@4a3f1c1b com.example.SecurityFilter@1d2e3f>
> {noformat}
> Or something similar.
> h2. Possible Additions / Enhancements
> - Build-time / Startup Logging: Log the assembled pipeline string at
> {{DEBUG}} level when a pipeline is built in {{PipelineBuilderImpl}}
> - Tapestry 5 Dashboard: Expose the formatted pipeline structure on the
> dashboard for easier access
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