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org.codehaus.plexus.PlexusContainer Maven / Gradle / Ivy
package org.codehaus.plexus;
/*
* Copyright 2001-2006 Codehaus Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.List;
import java.util.Map;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.component.composition.CycleDetectedInComponentGraphException;
import org.codehaus.plexus.component.discovery.ComponentDiscoveryListener;
import org.codehaus.plexus.component.repository.ComponentDescriptor;
import org.codehaus.plexus.component.repository.exception.ComponentLifecycleException;
import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
import org.codehaus.plexus.component.repository.exception.ComponentRepositoryException;
import org.codehaus.plexus.configuration.PlexusConfigurationException;
import org.codehaus.plexus.context.Context;
/**
* PlexusContainer is the entry-point for loading and accessing other
* components.
*/
public interface PlexusContainer
{
String ROLE = PlexusContainer.class.getName();
// ------------------------------------------------------------------------
// Lookup
// ------------------------------------------------------------------------
/**
* Looks up and returns a component object with the given unique key or role.
* @param role a unique key for the desired component
* @return a Plexus component object
*/
Object lookup( String role )
throws ComponentLookupException;
/**
* Looks up and returns a component object with the given unique role/role-hint combination.
* @param role a non-unique key for the desired component
* @param roleHint a hint for the desired component implementation
* @return a Plexus component object
*/
Object lookup( String role, String roleHint )
throws ComponentLookupException;
/**
* Looks up and returns a component object with the given unique key or role.
* @param type the unique type of the component within the container
* @return a Plexus component object
*/
T lookup( Class type )
throws ComponentLookupException;
/**
* Looks up and returns a component object with the given unique role/role-hint combination.
* @param type the non-unique type of the component
* @param roleHint a hint for the desired component implementation
* @return a Plexus component object
*/
T lookup( Class type, String roleHint )
throws ComponentLookupException;
/**
* Looks up and returns a component object with the given unique role/role-hint combination.
* @param type the non-unique type of the component
* @param role a non-unique key for the desired component
* @param roleHint a hint for the desired component implementation
* @return a Plexus component object
*/
T lookup( Class type, String role, String roleHint )
throws ComponentLookupException;
/**
* Looks up and returns a List of component objects with the given role.
* @param role a non-unique key for the desired components
* @return a List of component objects
*/
List lookupList( String role )
throws ComponentLookupException;
/**
* Looks up and returns a List of component objects with the given role.
* @param role a non-unique key for the desired components
* @return a List of component objects
*/
List lookupList( String role, List roleHints )
throws ComponentLookupException;
/**
* Looks up and returns a List of component objects with the given role.
* @param type the non-unique type of the components
* @return a List of component objects
*/
List lookupList( Class type )
throws ComponentLookupException;
/**
* Looks up and returns a List of component objects with the given role.
* @param type the non-unique type of the components
* @return a List of component objects
*/
List lookupList( Class type, List roleHints )
throws ComponentLookupException;
/**
* Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
* @param role a non-unique key for the desired components
* @return a Map of component objects
*/
Map lookupMap( String role )
throws ComponentLookupException;
/**
* Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
* @param role a non-unique key for the desired components
* @return a Map of component objects
*/
Map lookupMap( String role, List roleHints )
throws ComponentLookupException;
/**
* Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
* @param type the non-unique type of the components
* @return a Map of component objects
*/
Map lookupMap( Class type )
throws ComponentLookupException;
/**
* Looks up and returns a Map of component objects with the given role, keyed by all available role-hints.
* @param type the non-unique type of the components
* @return a Map of component objects
*/
Map lookupMap( Class type, List roleHints )
throws ComponentLookupException;
// ----------------------------------------------------------------------
// Component Descriptor Lookup
// ----------------------------------------------------------------------
/**
* Returns the ComponentDescriptor with the given component role and the default role hint.
* Searches up the hierarchy until one is found, null if none is found.
* @param role a unique role for the desired component's descriptor
* @return the ComponentDescriptor with the given component role
*/
ComponentDescriptor getComponentDescriptor( String role );
/**
* Returns the ComponentDescriptor with the given component role and hint.
* Searches up the hierarchy until one is found, null if none is found.
* @param role a unique role for the desired component's descriptor
* @param roleHint a hint showing which implementation should be used
* @return the ComponentDescriptor with the given component role
*/
ComponentDescriptor getComponentDescriptor( String role, String roleHint );
/**
* Returns the ComponentDescriptor with the given component role and hint.
* Searches up the hierarchy until one is found, null if none is found.
* @param type the Java type of the desired component
* @param role a unique role for the desired component's descriptor
* @param roleHint a hint showing which implementation should be used
* @return the ComponentDescriptor with the given component role
*/
ComponentDescriptor getComponentDescriptor( Class type, String role, String roleHint );
/**
* Returns a Map of ComponentDescriptors with the given role, keyed by role-hint. Searches up the hierarchy until
* all are found, an empty Map if none are found.
* @param role a non-unique key for the desired components
* @return a Map of component descriptors keyed by role-hint
*/
Map> getComponentDescriptorMap( String role );
/**
* Returns a Map of ComponentDescriptors with the given role, keyed by role-hint. Searches up the hierarchy until
* all are found, an empty Map if none are found.
* @param type the Java type of the desired components
* @param role a non-unique key for the desired components
* @return a Map of component descriptors keyed by role-hint
*/
Map> getComponentDescriptorMap( Class type, String role );
/**
* Returns a List of ComponentDescriptors with the given role. Searches up the hierarchy until all are found, an
* empty List if none are found.
* @param role a non-unique key for the desired components
* @return a List of component descriptors
*/
List> getComponentDescriptorList( String role );
/**
* Returns a List of ComponentDescriptors with the given role. Searches up the hierarchy until all are found, an
* empty List if none are found.
* @param type the Java type of the desired components
* @param role a non-unique key for the desired components
* @return a List of component descriptors
*/
List> getComponentDescriptorList( Class type, String role );
/**
* Adds a component descriptor to this container. componentDescriptor should have realmId set.
* @param componentDescriptor
* @throws ComponentRepositoryException
*/
void addComponentDescriptor( ComponentDescriptor componentDescriptor )
throws CycleDetectedInComponentGraphException;
/**
* Releases the component from the container. This is dependant upon how the implementation manages the component,
* but usually enacts some standard lifecycle shutdown procedure on the component. In every case, the component is
* no longer accessible from the container (unless another is created).
* @param component the plexus component object to release
* @throws ComponentLifecycleException
*/
void release( Object component )
throws ComponentLifecycleException;
/**
* Releases all Mapped component values from the container.
* @see PlexusContainer#release( Object component )
* @param components Map of plexus component objects to release
* @throws ComponentLifecycleException
*/
void releaseAll( Map components )
throws ComponentLifecycleException;
/**
* Releases all Listed components from the container.
* @see PlexusContainer#release( Object component )
* @param components List of plexus component objects to release
* @throws ComponentLifecycleException
*/
void releaseAll( List components )
throws ComponentLifecycleException;
/**
* Returns true if this container has the keyed component.
* @param role a non-unique key for the desired component
* @return true if this container has the keyed component
*/
boolean hasComponent( String role );
/**
* Returns true if this container has a component with the given role/role-hint.
* @param role a non-unique key for the desired component
* @param roleHint a hint for the desired component implementation
* @return true if this container has a component with the given role/role-hint
*/
boolean hasComponent( String role, String roleHint );
/**
* Returns true if this container has a component with the given role/role-hint.
* @param type the non-unique type of the component
* @return true if this container has a component with the given role/role-hint
*/
boolean hasComponent( Class type );
/**
* Returns true if this container has a component with the given role/role-hint.
* @param type the non-unique type of the component
* @param roleHint a hint for the desired component implementation
* @return true if this container has a component with the given role/role-hint
*/
boolean hasComponent( Class type, String roleHint );
/**
* Returns true if this container has a component with the given role/role-hint.
* @param type the non-unique type of the component
* @param role a non-unique key for the desired component
* @param roleHint a hint for the desired component implementation
* @return true if this container has a component with the given role/role-hint
*/
boolean hasComponent( Class type, String role, String roleHint );
/**
* Disposes of this container, which in turn disposes all of it's components. This container should also remove
* itself from the container hierarchy.
*/
void dispose();
// ----------------------------------------------------------------------
// Context
// ----------------------------------------------------------------------
/**
* Add a key/value pair to this container's Context.
* @param key any unique object valid to the Context's implementation
* @param value any object valid to the Context's implementation
*/
void addContextValue( Object key, Object value );
/**
* Returns this container's context. A Context is a simple data store used to hold values which may alter the
* execution of the Container.
* @return this container's context.
*/
Context getContext();
/**
* Returns the Classworld's ClassRealm of this Container, which acts as the default parent for all contained
* components.
* @return the ClassRealm of this Container
*/
ClassRealm getContainerRealm();
// ----------------------------------------------------------------------
// Discovery
// ----------------------------------------------------------------------
/**
* Adds the listener to this container. ComponentDiscoveryListeners have the ability to respond to various
* ComponentDiscoverer events.
* @param listener A listener which responds to differnet ComponentDiscoveryEvents
*/
void registerComponentDiscoveryListener( ComponentDiscoveryListener listener );
/**
* Removes the listener from this container.
* @param listener A listener to remove
*/
void removeComponentDiscoveryListener( ComponentDiscoveryListener listener );
/**
* Discovers components in the given realm.
* @param childRealm
* @param override wheter to override/merge any conflicting components, where the new component takes precedence.
* @return
* @throws PlexusConfigurationException
* @throws ComponentRepositoryException
*/
List> discoverComponents( ClassRealm childRealm )
throws PlexusConfigurationException, CycleDetectedInComponentGraphException;
List> discoverComponents( ClassRealm realm, Object data )
throws PlexusConfigurationException, CycleDetectedInComponentGraphException;
// ----------------------------------------------------------------------------
// Component/Plugin ClassRealm creation
// ----------------------------------------------------------------------------
ClassRealm createChildRealm( String id );
ClassRealm getComponentRealm( String realmId );
/**
* Dissociate the realm with the specified id from the container. This will
* remove all components contained in the realm from the component repository.
*
* @param componentRealm Realm to remove from the container.
*/
void removeComponentRealm( ClassRealm componentRealm )
throws PlexusContainerException;
/**
* Returns the lookup realm for this container, which is either
* the container realm or the realm set by {@see MutablePlexusContainer#setLookupRealm(ClassRealm)}.
*/
ClassRealm getLookupRealm();
/**
* Sets the lookup realm to use for lookup calls that don't have a ClassRealm parameter.
* @param realm the new realm to use.
* @return The previous lookup realm. It is adviced to set it back once the old-style lookups have completed.
*/
ClassRealm setLookupRealm(ClassRealm realm);
/**
* XXX ideally i'd like to place this in a plexus container specific utility class.
*
* Utility method to retrieve the lookup realm for a component instance.
* If the component's classloader is a ClassRealm, that realm is returned,
* otherwise the result of getLookupRealm is returned.
* @param component
* @return
*/
ClassRealm getLookupRealm( Object component );
void addComponent( Object component, String role )
throws CycleDetectedInComponentGraphException;
/**
* Adds live component instance to this container.
*
* Component instance is not associated with any class realm and will
* be ignored during lookup is lookup realm is provided using thread context
* classloader.
*/
void addComponent( T component, Class role, String roleHint );
}
