Interface BeanContextServices

public void addBeanContextServicesListener(BeanContextServicesListener listener)

Add a listener on all adds and removes of services.

Parameters:

listener - the listener to add.

public boolean addService(Class<T> serviceClass,
                          BeanContextServiceProvider provider)

Register a service to make it available to others. This class may refuse to add the service based on whatever information it can gather, including whether the service provider is trusted.

Parameters:

serviceClass - the service class.

provider - the factory that will actually provide the service.

Returns:

whether the service was added or not.

public Iterator<E> getCurrentServiceClasses()

Get a list of all service classes supported.

This method must synchronize on BeanContext.globalHierarchyLock.

Returns:

a list of all service classes supported.

See Also:

BeanContext.globalHierarchyLock

public Iterator<E> getCurrentServiceSelectors(Class<T> serviceClass)

Get a list of valid service selectors for the specified service class.

If the specified service class does not have a finite number of valid service selectors, it should return null. If it takes a general Integer parameter, for example, you may as well return null or the poor soul who called this method will be iterating all day.

If it has no valid service selectors, it should still return an empty Iterator.

Parameters:

serviceClass - the service class to get selectors for.

Returns:

a list of valid service selectors for the service class, or null.

public Object getService(BeanContextChild requestorChild,
                         Object requestor,
                         Class<T> serviceClass,
                         Object serviceSelector,
                         BeanContextServiceRevokedListener listener)
            throws TooManyListenersException

Get a service from this BeanContextServices.

The specified listener will be registered to receive a revocation notice for the specified serviceClass. One notification per service class per requestor object will be sent.

The listener will be unregistered when all services that were obtained by that requestor for that service class are released.

If the requested service class is not available, or if this BeanContextServices object chooses not honor the request because the service class has been revoked or for some other reason, then this method will return null.

This method may throw unchecked exceptions, so watch out.

Parameters:

requestorChild - the BeanContextChild associated with the requestor. Typically this will be the same as the requestor itself, but since any Object, even one outside the hierarchy, may make a request, this parameter is necessary. Only weak references to this will be retained, and it will never be changed, only queried in a read-only manner.

requestor - the actual requestor of the service. Only weak references to this will be retained, and it will never be changed, only queried in a read-only manner.

serviceClass - the Class of the service being requested.

serviceSelector - a parameter to customize the service returned with.

listener - a listener that will be notified if the service being requested is revoked.

Returns:

an instance of serviceClass (such that instanceof serviceClass is true), or null.

public boolean hasService(Class<T> serviceClass)

Tell whether the specified service class is available. Iff getService() could return a non-null value for the specified service, this method will return true.

Parameters:

serviceClass - the service class to check on.

Returns:

whether the specified service class is available.

public void releaseService(BeanContextChild requestorChild,
                           Object requestor,
                           Object service)

Release your copy of this service.

If all copies of the service's class have been relinquished by the requestor, the BeanContextServiceRevokedListener previously registered by getService() will be unregistered.

Parameters:

requestorChild - the original BeanContextChild requesting the service.

requestor - the original requestor of the service.

service - the service to relinquish

See Also:

getService(BeanContextChild,Object,Class,Object,BeanContextServiceRevokedListener)

public void removeBeanContextServicesListener(BeanContextServicesListener listener)

Remove a listener on all adds and removes of services.

Parameters:

listener - the listener to add.

public void revokeService(Class<T> serviceClass,
                          BeanContextServiceProvider provider,
                          boolean revokeNow)

Make it so that no one else can use this service.

If revokeNow is false, the only effect of this method is to make all subsequent calls to getService() on this service class fail.

If it is true, a message is also sent out to all listeners on the service and all references to it are released.

Parameters:

serviceClass - the service class to revoke.

provider - the service provider providing the service class.

revokeNow - whether to release all current references to the service.