java.beans.beancontext

## Interface BeanContextServiceProvider

- All Known Implementing Classes:
    BeanContextServicesSupport.BCSSProxyServiceProvider

      public interface BeanContextServiceProvider

  One of the primary functions of a BeanContext is to act a as rendezvous between JavaBeans, and BeanContextServiceProviders.

  A JavaBean nested within a BeanContext, may ask that BeanContext to provide an instance of a "service", based upon a reference to a Java Class object that represents that service.

  If such a service has been registered with the context, or one of its nesting context's, in the case where a context delegate to its context to satisfy a service request, then the BeanContextServiceProvider associated with the service is asked to provide an instance of that service.

  The ServcieProvider may always return the same instance, or it may construct a new instance for each request.

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Iterator` | `getCurrentServiceSelectors(BeanContextServices bcs, Class serviceClass)` Invoked by `BeanContextServices`, this method gets the current service selectors for the specified service.
    `Object` | `getService(BeanContextServices bcs, Object requestor, Class serviceClass, Object serviceSelector)` Invoked by `BeanContextServices`, this method requests an instance of a service from this `BeanContextServiceProvider`.
    `void` | `releaseService(BeanContextServices bcs, Object requestor, Object service)` Invoked by `BeanContextServices`, this method releases a nested `BeanContextChild`'s (or any arbitrary object associated with a `BeanContextChild`) reference to the specified service.

- - ### Method Detail

    - #### getService

          Object getService(BeanContextServices bcs,
                          Object requestor,
                          Class serviceClass,
                          Object serviceSelector)

      Invoked by `BeanContextServices`, this method requests an instance of a service from this `BeanContextServiceProvider`.
      Parameters:
        `bcs` - The `BeanContextServices` associated with this particular request. This parameter enables the `BeanContextServiceProvider` to distinguish service requests from multiple sources.
        `requestor` - The object requesting the service
        `serviceClass` - The service requested
        `serviceSelector` - the service dependent parameter for a particular service, or `null` if not applicable.
      Returns:
        a reference to the requested service

    - #### releaseService

          void releaseService(BeanContextServices bcs,
                            Object requestor,
                            Object service)

      Invoked by `BeanContextServices`, this method releases a nested `BeanContextChild`'s (or any arbitrary object associated with a `BeanContextChild`) reference to the specified service.
      Parameters:
        `bcs` - the `BeanContextServices` associated with this particular release request
        `requestor` - the object requesting the service to be released
        `service` - the service that is to be released

    - #### getCurrentServiceSelectors

          Iterator getCurrentServiceSelectors(BeanContextServices bcs,
                                            Class serviceClass)

      Invoked by `BeanContextServices`, this method gets the current service selectors for the specified service. A service selector is a service specific parameter, typical examples of which could include: a parameter to a constructor for the service implementation class, a value for a particular service's property, or a key into a map of existing implementations.
      Parameters:
        `bcs` - the `BeanContextServices` for this request
        `serviceClass` - the specified service
      Returns:
        the current service selectors for the specified serviceClass

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