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Spring and Resources
For its self-contained subsystems, the IdP programmatically creates and manages its own Spring application contexts by loading configuration resources. The Spring Resource interface (org.springframework.core.io.Resource
) is used to manage access to configuration material.
As well as the usual slew of Spring-provided Resource types, one other specialized Resources has been implemented the HTTPResource types.
Reloadability
Programming a reloadable subsystem
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To configure a serviceable bean, instantiate a ReloadableSpringService, providing the class type of the subsystem bean (or an interface it implemements) to the constructor, and a list of Spring resources in the serviceConfiguration
property. Other properties which can be used to control reloading behavior include:
failFast
reloadCheckDelay
reloadtaskTimer
There are numerous examples in system/conf/services-system.xml, including advanced examples that demonstrate how to dynamically supply an implementation class that implements the desired interface after configuring the Spring context.
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Using a subsystem requires:
Interrogating the ReloadableSpringService for the current serviceable component in the subsystem (via
getServiceableComponent()
)Interrogating the component for the subsystem component (via
getComponent()
)Performing operations on the component.
Unpinning the component. (via
unpinComponent()
)
It is vital that every call to getServiceableComponent()
is matched by a call to unpinComponent()
as these are essentially lock and unlock operations.
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