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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.provider;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.assembly.Implementation;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentReference;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
/**
* Default implementation of a provider factory extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultProviderFactoryExtensionPoint implements ProviderFactoryExtensionPoint {
private ExtensionPointRegistry registry;
private final Map<Class<?>, ProviderFactory> providerFactories = new HashMap<Class<?>, ProviderFactory>();
private final List<PolicyProviderFactory> policyProviderFactories = new ArrayList<PolicyProviderFactory>();
private boolean loaded;
/**
* The default constructor. Does nothing.
*
*/
public DefaultProviderFactoryExtensionPoint(ExtensionPointRegistry registry) {
this.registry = registry;
}
/**
* Add a provider factory.
*
* @param providerFactory The provider factory
*/
public void addProviderFactory(ProviderFactory providerFactory) {
if(providerFactory instanceof PolicyProviderFactory) {
policyProviderFactories.add((PolicyProviderFactory)providerFactory);
}
providerFactories.put(providerFactory.getModelType(), providerFactory);
}
/**
* Remove a provider factory.
*
* @param providerFactory The provider factory
*/
public void removeProviderFactory(ProviderFactory providerFactory) {
if(providerFactory instanceof PolicyProviderFactory) {
policyProviderFactories.remove((PolicyProviderFactory)providerFactory);
}
providerFactories.remove(providerFactory.getModelType());
}
/**
* Returns the provider factory associated with the given model type.
* @param modelType A model type
* @return The provider factory associated with the given model type
*/
public ProviderFactory getProviderFactory(Class<?> modelType) {
loadProviderFactories();
Class<?>[] classes = modelType.getInterfaces();
for (Class<?> c : classes) {
ProviderFactory factory = providerFactories.get(c);
if (factory != null) {
return factory;
}
}
return providerFactories.get(modelType);
}
public List<PolicyProviderFactory> getPolicyProviderFactories() {
loadProviderFactories();
return policyProviderFactories;
}
/**
* Load provider factories declared under META-INF/services.
* @param registry
*/
private void loadProviderFactories() {
if (loaded)
return;
loadProviderFactories(BindingProviderFactory.class);
loadProviderFactories(ImplementationProviderFactory.class);
loadProviderFactories(PolicyProviderFactory.class);
loaded = true;
}
/**
* Load provider factories declared under META-INF/services.
* @param registry
* @param factoryClass
* @return
*/
private List<ProviderFactory> loadProviderFactories(Class<?> factoryClass) {
// Get the provider factory service declarations
Set<ServiceDeclaration> factoryDeclarations;
ServiceDiscovery serviceDiscovery = ServiceDiscovery.getInstance();
try {
factoryDeclarations = serviceDiscovery.getServiceDeclarations(factoryClass);
} catch (Exception e) {
throw new IllegalStateException(e);
}
// Get the target extension point
ProviderFactoryExtensionPoint factoryExtensionPoint =
registry.getExtensionPoint(ProviderFactoryExtensionPoint.class);
List<ProviderFactory> factories = new ArrayList<ProviderFactory>();
for (ServiceDeclaration factoryDeclaration : factoryDeclarations) {
Map<String, String> attributes = factoryDeclaration.getAttributes();
// Load an implementation provider factory
if (factoryClass == ImplementationProviderFactory.class) {
String modelTypeName = attributes.get("model");
// Create a provider factory wrapper and register it
ImplementationProviderFactory factory =
new LazyImplementationProviderFactory(registry, modelTypeName, factoryDeclaration);
factoryExtensionPoint.addProviderFactory(factory);
factories.add(factory);
} else if (factoryClass == BindingProviderFactory.class) {
// Load a binding provider factory
String modelTypeName = attributes.get("model");
// Create a provider factory wrapper and register it
BindingProviderFactory factory =
new LazyBindingProviderFactory(registry, modelTypeName, factoryDeclaration);
factoryExtensionPoint.addProviderFactory(factory);
factories.add(factory);
} else if (factoryClass == PolicyProviderFactory.class) {
// Load a policy provider factory
String modelTypeName = attributes.get("model");
// Create a provider factory wrapper and register it
PolicyProviderFactory factory =
new LazyPolicyProviderFactory(registry, modelTypeName, factoryDeclaration);
factoryExtensionPoint.addProviderFactory(factory);
factories.add(factory);
}
}
return factories;
}
/**
* A wrapper around an implementation provider factory allowing lazy
* loading and initialization of implementation providers.
*/
private static class LazyBindingProviderFactory implements BindingProviderFactory {
private ExtensionPointRegistry registry;
private String modelTypeName;
private ServiceDeclaration factoryDeclaration;
private BindingProviderFactory factory;
private Class modelType;
private LazyBindingProviderFactory(ExtensionPointRegistry registry,
String modelTypeName,
ServiceDeclaration factoryDeclaration) {
this.registry = registry;
this.modelTypeName = modelTypeName;
this.factoryDeclaration = factoryDeclaration;
}
@SuppressWarnings("unchecked")
private BindingProviderFactory getFactory() {
if (factory == null) {
try {
Class<BindingProviderFactory> factoryClass =
(Class<BindingProviderFactory>)factoryDeclaration.loadClass();
Constructor<BindingProviderFactory> constructor =
factoryClass.getConstructor(ExtensionPointRegistry.class);
factory = constructor.newInstance(registry);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return factory;
}
@SuppressWarnings("unchecked")
public ReferenceBindingProvider createReferenceBindingProvider(RuntimeComponent component,
RuntimeComponentReference reference,
Binding binding) {
return getFactory().createReferenceBindingProvider(component, reference, binding);
}
@SuppressWarnings("unchecked")
public ServiceBindingProvider createServiceBindingProvider(RuntimeComponent component,
RuntimeComponentService service,
Binding binding) {
return getFactory().createServiceBindingProvider(component, service, binding);
}
public Class getModelType() {
if (modelType == null) {
try {
modelType = factoryDeclaration.loadClass(modelTypeName);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return modelType;
}
}
/**
* A wrapper around an implementation provider factory allowing lazy
* loading and initialization of implementation providers.
*/
private class LazyImplementationProviderFactory implements ImplementationProviderFactory {
private ExtensionPointRegistry registry;
private String modelTypeName;
private ServiceDeclaration providerClass;
private ImplementationProviderFactory factory;
private Class modelType;
private LazyImplementationProviderFactory(ExtensionPointRegistry registry,
String modelTypeName,
ServiceDeclaration providerClass) {
this.registry = registry;
this.modelTypeName = modelTypeName;
this.providerClass = providerClass;
}
@SuppressWarnings("unchecked")
private ImplementationProviderFactory getFactory() {
if (factory == null) {
try {
Class<ImplementationProviderFactory> factoryClass =
(Class<ImplementationProviderFactory>)providerClass.loadClass();
Constructor<ImplementationProviderFactory> constructor =
factoryClass.getConstructor(ExtensionPointRegistry.class);
factory = constructor.newInstance(registry);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return factory;
}
@SuppressWarnings("unchecked")
public ImplementationProvider createImplementationProvider(RuntimeComponent component,
Implementation Implementation) {
return getFactory().createImplementationProvider(component, Implementation);
}
public Class getModelType() {
if (modelType == null) {
try {
modelType = providerClass.loadClass(modelTypeName);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return modelType;
}
}
/**
* A wrapper around an policy provider factory allowing lazy
* loading and initialization of policy providers.
*/
private class LazyPolicyProviderFactory implements PolicyProviderFactory {
private ExtensionPointRegistry registry;
private String modelTypeName;
private ServiceDeclaration providerClass;
private PolicyProviderFactory factory;
private Class modelType;
private LazyPolicyProviderFactory(ExtensionPointRegistry registry,
String modelTypeName,
ServiceDeclaration providerClass) {
this.registry = registry;
this.modelTypeName = modelTypeName;
this.providerClass = providerClass;
}
@SuppressWarnings("unchecked")
private PolicyProviderFactory getFactory() {
if (factory == null) {
try {
Class<PolicyProviderFactory> factoryClass = (Class<PolicyProviderFactory>)providerClass.loadClass();
Constructor<PolicyProviderFactory> constructor =
factoryClass.getConstructor(ExtensionPointRegistry.class);
factory = constructor.newInstance(registry);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return factory;
}
public PolicyProvider createImplementationPolicyProvider(RuntimeComponent component,
Implementation implementation) {
return getFactory().createImplementationPolicyProvider(component, implementation);
}
public PolicyProvider createReferencePolicyProvider(RuntimeComponent component,
RuntimeComponentReference reference,
Binding binding) {
return getFactory().createReferencePolicyProvider(component, reference, binding);
}
public PolicyProvider createServicePolicyProvider(RuntimeComponent component,
RuntimeComponentService service,
Binding binding) {
return getFactory().createServicePolicyProvider(component, service, binding);
}
public Class getModelType() {
if (modelType == null) {
try {
modelType = providerClass.loadClass(modelTypeName);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return modelType;
}
}
}
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