org.davic.resources
Interface ResourceClient

public interface ResourceClient

This interface should be implemented by objects that use a scarce resource.

Method Summary

void	notifyRelease(ResourceProxy proxy) A call to this operation notifies the ResourceClient that proxy has lost access to a resource.
void	release(ResourceProxy proxy) A call to this operation informs the ResourceClient that proxy is about to lose access to a resource.
boolean	requestRelease(ResourceProxy proxy, Object requestData) A call to this operation informs the ResourceClient that another application has requested the resource accessed via the proxy parameter.

Method Detail

requestRelease

boolean requestRelease(ResourceProxy proxy,
                       Object requestData)

A call to this operation informs the ResourceClient that another application has requested the resource accessed via the proxy parameter. If the ResourceClient decides to give up the resource as a result of this, it should terminate its usage of proxy and return True, otherwise False. requestData may be used to pass more data to the ResourceClient so that it can decide whether or not to give up the resource, using semantics specified outside this framework; for conformance to this framework, requestData can be ignored by the ResourceClient.

Parameters:

proxy - the ResourceProxy representing the scarce resource to the application

requestData - application specific data

Returns:

If the ResourceClient decides to give up the resource following this call, it should terminate its usage of proxy and return True, otherwise False.

release

void release(ResourceProxy proxy)

A call to this operation informs the ResourceClient that proxy is about to lose access to a resource. The ResourceClient shall complete any clean-up that is needed before the resource is lost before it returns from this operation. This operation is not guaranteed to be allowed to complete before notifyRelease() is called.

Parameters:

proxy - the ResourceProxy representing the scarce resource to the application

notifyRelease

void notifyRelease(ResourceProxy proxy)

A call to this operation notifies the ResourceClient that proxy has lost access to a resource. This can happen for two reasons: either the resource is unavailable for some reason beyond the control of the environment (e.g. hardware failure) or because the client has been too long in dealing with a ResourceClient.release() call.

Parameters:

proxy - the ResourceProxy representing the scarce resource to the application