/*
* Copyright (c) 2008, Rickard Öberg. All Rights Reserved.
* Copyright (c) 2012, Paul Merlin.
*
* 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.
*
*/
package org.qi4j.runtime.structure;
import java.util.ArrayList;
import java.util.List;
import org.qi4j.api.activation.ActivationEventListener;
import org.qi4j.api.activation.ActivationException;
import org.qi4j.api.activation.PassivationException;
import org.qi4j.api.common.Visibility;
import org.qi4j.api.service.ServiceReference;
import org.qi4j.api.structure.Layer;
import org.qi4j.functional.Function;
import org.qi4j.runtime.activation.ActivationDelegate;
import org.qi4j.runtime.composite.TransientModel;
import org.qi4j.runtime.entity.EntityModel;
import org.qi4j.runtime.object.ObjectModel;
import org.qi4j.runtime.value.ValueModel;
import static org.qi4j.functional.Iterables.flattenIterables;
import static org.qi4j.functional.Iterables.map;
/**
* Instance of a Qi4j application layer. Contains a list of modules which are managed by this layer.
*/
public class LayerInstance
implements Layer
{
// Constructor parameters
private final LayerModel layerModel;
private final ApplicationInstance applicationInstance;
private final UsedLayersInstance usedLayersInstance;
// Eager instance objects
private final ActivationDelegate activation;
private final List<ModuleInstance> moduleInstances;
public LayerInstance( LayerModel model,
ApplicationInstance applicationInstance,
UsedLayersInstance usedLayersInstance )
{
// Constructor parameters
this.layerModel = model;
this.applicationInstance = applicationInstance;
this.usedLayersInstance = usedLayersInstance;
// Eager instance objects
activation = new ActivationDelegate( this );
moduleInstances = new ArrayList<>();
}
@Override
public String toString()
{
return layerModel.toString();
}
// Implementation of Layer
@Override
public String name()
{
return layerModel.name();
}
// Implementation of MetaInfoHolder
@Override
public <T> T metaInfo( Class<T> infoType )
{
return layerModel.metaInfo( infoType );
}
// Implementation of Activation
@Override
public void activate()
throws ActivationException
{
activation.activate( layerModel.newActivatorsInstance(), moduleInstances );
}
@Override
public void passivate()
throws PassivationException
{
activation.passivate();
}
@Override
public void registerActivationEventListener( ActivationEventListener listener )
{
activation.registerActivationEventListener( listener );
}
@Override
public void deregisterActivationEventListener( ActivationEventListener listener )
{
activation.deregisterActivationEventListener( listener );
}
// Other methods
/* package */ void addModule( ModuleInstance module )
{
module.registerActivationEventListener( activation );
moduleInstances.add( module );
}
/* package */ LayerModel model()
{
return layerModel;
}
public ApplicationInstance applicationInstance()
{
return applicationInstance;
}
/* package */ UsedLayersInstance usedLayersInstance()
{
return usedLayersInstance;
}
/* package */ Iterable<ModelModule<ObjectModel>> visibleObjects( final Visibility visibility )
{
return flattenIterables( map( new Function<ModuleInstance, Iterable<ModelModule<ObjectModel>>>()
{
@Override
public Iterable<ModelModule<ObjectModel>> map( ModuleInstance moduleInstance )
{
return moduleInstance.visibleObjects( visibility );
}
}, moduleInstances ) );
}
/* package */ Iterable<ModelModule<TransientModel>> visibleTransients( final Visibility visibility )
{
return flattenIterables( map( new Function<ModuleInstance, Iterable<ModelModule<TransientModel>>>()
{
@Override
public Iterable<ModelModule<TransientModel>> map( ModuleInstance moduleInstance )
{
return moduleInstance.visibleTransients( visibility );
}
}, moduleInstances ) );
}
/* package */ Iterable<ModelModule<EntityModel>> visibleEntities( final Visibility visibility )
{
return flattenIterables( map( new Function<ModuleInstance, Iterable<ModelModule<EntityModel>>>()
{
@Override
public Iterable<ModelModule<EntityModel>> map( ModuleInstance moduleInstance )
{
return moduleInstance.visibleEntities( visibility );
}
}, moduleInstances ) );
}
/* package */ Iterable<ModelModule<ValueModel>> visibleValues( final Visibility visibility )
{
return flattenIterables( map( new Function<ModuleInstance, Iterable<ModelModule<ValueModel>>>()
{
@Override
public Iterable<ModelModule<ValueModel>> map( ModuleInstance moduleInstance )
{
return moduleInstance.visibleValues( visibility );
}
}, moduleInstances ) );
}
/* package */ Iterable<ServiceReference<?>> visibleServices( final Visibility visibility )
{
return flattenIterables( map( new Function<ModuleInstance, Iterable<ServiceReference<?>>>()
{
@Override
public Iterable<ServiceReference<?>> map( ModuleInstance moduleInstance )
{
return moduleInstance.visibleServices( visibility );
}
}, moduleInstances ) );
}
/* package */ ModuleInstance findModule( String moduleName )
{
for( ModuleInstance moduleInstance : moduleInstances )
{
if( moduleInstance.model().name().equals( moduleName ) )
{
return moduleInstance;
}
}
throw new IllegalArgumentException( "No such module:" + moduleName );
}
}