Allow dynamic services to be created based on configuration
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Key: TAP5-1313
URL: https://issues.apache.org/jira/browse/TAP5-1313
Project: Tapestry 5
Issue Type: New Feature
Components: tapestry-ioc
Affects Versions: 5.2.2
Reporter: Tom van Dijk
Dynamic services are services that are not defined at compile-time, but at
runtime, just before performing Registry startup.
Dynamic services are a useful concept for the implementation of a module that
allows for multiple Hibernate databases. Other modules can contribute markers
to the Hibernate module. The Hibernate module will then create the set of
Hibernate services (HibernateSessionSource, HibernateSessionManager, Session,
etc) with marker annotations and service ids based on the configuration. These
services can be further configured with contributions, e.g. if there are
databases with markers "One" and "Two", these could cause
HibernateEntityPackageManagerOne and HibernateEntityPackageManagerTwo to be
created, which can be configured with contributors
contributeHibernateEntityPackageManagerOne() and
contributeHibernateEntityPackageManagerTwo.
I propose dynamic services as one of the possible solutions for allowing
services to be created after initial setup. The advantage of this method is
that these services can be injected directly, without using indirect constructs
such as object providers, which have the disadvantage of not being able to use
the service lifecycle management Tapestry offers. It is also easier and more
intuitive to contribute to each individual service using the standard service
mechanisms in Tapestry rather than an indirect method, for example supplying
the entire configuration for all services to a hypothetical
HibernateObjectsSource or HibernateConfiguration service.
Dynamic services have to be added prior to validateContributeDefs() in the
constructor of the Registry service. I will include a patch with the
implementation of this feature and a test case.
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