1 files changed, 180 insertions, 0 deletions
diff --git a/tags/java/sca/1.5.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/endpointresolver/DefaultEndpointResolverFactoryExtensionPoint.java b/tags/java/sca/1.5.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/endpointresolver/DefaultEndpointResolverFactoryExtensionPoint.java
new file mode 100644
index 0000000000..04ac4ee20c
--- /dev/null
+++ b/tags/java/sca/1.5.1/modules/core-spi/src/main/java/org/apache/tuscany/sca/endpointresolver/DefaultEndpointResolverFactoryExtensionPoint.java
@@ -0,0 +1,180 @@
+/*
+ * 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;
+        }
+
+    }    
+
+}