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Diffstat (limited to 'sca-java-1.x/branches/sca-java-1.3.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/DefaultProviderFactoryExtensionPoint.java')
-rw-r--r-- | sca-java-1.x/branches/sca-java-1.3.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/DefaultProviderFactoryExtensionPoint.java | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.3.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/DefaultProviderFactoryExtensionPoint.java b/sca-java-1.x/branches/sca-java-1.3.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/DefaultProviderFactoryExtensionPoint.java new file mode 100644 index 0000000000..51e5e91589 --- /dev/null +++ b/sca-java-1.x/branches/sca-java-1.3.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/provider/DefaultProviderFactoryExtensionPoint.java @@ -0,0 +1,363 @@ +/* + * 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.Endpoint; +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; + } + + } + +} |