org.apache.felix.dm.context

Interface DependencyContext

All Superinterfaces:

Dependency

All Known Implementing Classes:

AbstractDependency

public interface DependencyContext
extends Dependency

Every DependencyManager Dependency implementations must implement this interface.

See Also:

AbstractDependency} which already implements most of the methods from this interface.

Method Summary

Modifier and Type	Method and Description
void	copyToCollection(java.util.Collection<java.lang.Object> coll) Copies all the dependency service instances to the given collection.
void	copyToMap(java.util.Map<java.lang.Object,java.util.Dictionary<?,?>> map) Copies all the dependency service instances to the given map (key = dependency service, value = dependency servie properties).
DependencyContext	createCopy() Creates a clone of this dependency.
java.lang.Class<?>	getAutoConfigType() Returns the type of the field which can be injected with the dependency service.
ComponentContext	getComponentContext() Returns the Component implementation context associated to this Dependency context.
Event	getService() Returns the highest ranked available dependency service instance, or null if the dependency is unavailable.
void	invokeCallback(EventType type, Event... events) The Component implementation asks this dependency to invoke a component dependency callback.
boolean	isInstanceBound() Is this dependency instance bound ?
boolean	isStarted() Returns true if the dependency has been started, false if not
boolean	needsInstance() Does this dependency need the component instances to determine if the dependency is available or not.
void	setAvailable(boolean available) Sets this dependency as available, meaning that at least one dependency service is available.
void	setComponentContext(ComponentContext component) Stores the Component implementation context in the Dependency Implementation.
void	setInstanceBound(boolean instanceBound) Sets this dependency as "instance bound".
void	start() Invoked by the component context when the dependency should start working.
void	stop() Invoked by the component context when the dependency should stop working.

Methods inherited from interface org.apache.felix.dm.Dependency

getAutoConfigName, getProperties, isAutoConfig, isAvailable, isPropagated, isRequired

Method Detail

setComponentContext

void setComponentContext(ComponentContext component)

Stores the Component implementation context in the Dependency Implementation. This object is the entry point to the Component implementation.

Parameters:

component - the Component implementation context

getComponentContext

ComponentContext getComponentContext()

Returns the Component implementation context associated to this Dependency context.

invokeCallback

void invokeCallback(EventType type,
                    Event... events)

The Component implementation asks this dependency to invoke a component dependency callback.

Parameters:

type - the type of the callback to invoke (add/change/remove/swap ...)

events - the dependency service event(s) that has previously been submitted to the component implementation using the ComponentContext.handleEvent method. The number of events depends on the event type: one event for ADDED/CHANGED/REMOVED, and two events for the SWAPPED event.

See Also:

ComponentContext.handleEvent(DependencyContext, EventType, Event...), EventType

start

void start()

Invoked by the component context when the dependency should start working.

stop

void stop()

Invoked by the component context when the dependency should stop working.

isStarted

boolean isStarted()

Returns true if the dependency has been started, false if not

Returns:

true if the dependency has been started, false if not

setAvailable

void setAvailable(boolean available)

Sets this dependency as available, meaning that at least one dependency service is available.

Parameters:

available - true to mark this dependency as available, false to mark it as unavailable

setInstanceBound

void setInstanceBound(boolean instanceBound)

Sets this dependency as "instance bound". A dependency is "instance bound" if it is defined from the component's init method.

Parameters:

true - if the dependency has to be marked as "intance bound", false if not.

isInstanceBound

boolean isInstanceBound()

Is this dependency instance bound ?

Returns:

true if this dependency is instance bound, false if not

needsInstance

boolean needsInstance()

Does this dependency need the component instances to determine if the dependency is available or not.

Returns:

true if the dependency need the component instances before it can be started, false if not.

getAutoConfigType

java.lang.Class<?> getAutoConfigType()

Returns the type of the field which can be injected with the dependency service.

Returns:

the type of the field which can be injected with the dependency service, or null if the dependency does not support auto config mode.

getService

Event getService()

Returns the highest ranked available dependency service instance, or null if the dependency is unavailable.

Returns:

the highest ranked available dependency service instance, or null

copyToCollection

void copyToCollection(java.util.Collection<java.lang.Object> coll)

Copies all the dependency service instances to the given collection.

Parameters:

coll - the collection where the dependency service instances will be copied

copyToMap

void copyToMap(java.util.Map<java.lang.Object,java.util.Dictionary<?,?>> map)

Copies all the dependency service instances to the given map (key = dependency service, value = dependency servie properties).

Parameters:

map - the map where the dependency service instances (with the corresponding service properties)

createCopy

DependencyContext createCopy()

Creates a clone of this dependency.

Returns:

a clone of this dependency.