Module java.desktop
Package 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

  Modifier and Type
  Method
  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 Details

  - ### 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