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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.endpointresolver;
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.Endpoint;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* Default implementation of a provider factory extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultEndpointResolverFactoryExtensionPoint implements EndpointResolverFactoryExtensionPoint {
private ExtensionPointRegistry registry;
private final Map<Class<?>, EndpointResolverFactory> endpointResolverFactories = new HashMap<Class<?>, EndpointResolverFactory>();
private boolean loaded;
/**
* The default constructor. Does nothing.
*
*/
public DefaultEndpointResolverFactoryExtensionPoint(ExtensionPointRegistry registry) {
this.registry = registry;
}
/**
* Add an endpoint resolver factory.
*
* @param endpointResolverFactory The resolver factory
*/
public void addEndpointResolverFactory(EndpointResolverFactory endpointResolverFactory){
endpointResolverFactories.put(endpointResolverFactory.getModelType(), endpointResolverFactory);
}
/**
* Remove a endpoint resolver factory.
*
* @param endpointResolverFactory The endpoint resolver factory
*/
public void removeEndpointResolverFactory(EndpointResolverFactory endpointResolverFactory){
endpointResolverFactories.remove(endpointResolverFactory.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 EndpointResolverFactory getEndpointResolverFactory(Class<?> modelType) {
loadProviderFactories();
Class<?>[] classes = modelType.getInterfaces();
for (Class<?> c : classes) {
EndpointResolverFactory factory = endpointResolverFactories.get(c);
if (factory != null) {
return factory;
}
}
return endpointResolverFactories.get(modelType);
}
/**
* Load provider factories declared under META-INF/services.
* @param registry
*/
private synchronized void loadProviderFactories() {
if (loaded)
return;
// Get the provider factory service declarations
Set<ServiceDeclaration> factoryDeclarations;
ServiceDiscovery serviceDiscovery = ServiceDiscovery.getInstance();
try {
factoryDeclarations = serviceDiscovery.getServiceDeclarations(EndpointResolverFactory.class);
} catch (Exception e) {
throw new IllegalStateException(e);
}
// Get the extension point
EndpointResolverFactoryExtensionPoint factoryExtensionPoint =
registry.getExtensionPoint(EndpointResolverFactoryExtensionPoint.class);
List<EndpointResolverFactory> factories = new ArrayList<EndpointResolverFactory>();
for (ServiceDeclaration factoryDeclaration : factoryDeclarations) {
Map<String, String> attributes = factoryDeclaration.getAttributes();
// Find the model type that identifies this resolver
String modelTypeName = attributes.get("model");
// Create a provider factory wrapper and register it
EndpointResolverFactory factory =
new LazyEndpointResolverFactory(registry, modelTypeName, factoryDeclaration);
factoryExtensionPoint.addEndpointResolverFactory(factory);
factories.add(factory);
}
loaded = true;
}
/**
* A wrapper around an endpoint provider factory allowing lazy
* loading and initialization of endpoint providers.
*/
private class LazyEndpointResolverFactory implements EndpointResolverFactory {
private ExtensionPointRegistry registry;
private String modelTypeName;
private ServiceDeclaration providerClass;
private EndpointResolverFactory factory;
private Class modelType;
private LazyEndpointResolverFactory(ExtensionPointRegistry registry,
String modelTypeName,
ServiceDeclaration providerClass) {
this.registry = registry;
this.modelTypeName = modelTypeName;
this.providerClass = providerClass;
}
@SuppressWarnings("unchecked")
private EndpointResolverFactory getFactory() {
if (factory == null) {
try {
Class<EndpointResolverFactory> factoryClass = (Class<EndpointResolverFactory>)providerClass.loadClass();
Constructor<EndpointResolverFactory> constructor =
factoryClass.getConstructor(ExtensionPointRegistry.class);
factory = constructor.newInstance(registry);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return factory;
}
public EndpointResolver createEndpointResolver(Endpoint endpoint, Binding binding) {
return getFactory().createEndpointResolver(endpoint, 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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