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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.web.javascript;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
import org.apache.tuscany.sca.core.UtilityExtensionPoint;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
import org.apache.tuscany.sca.monitor.Monitor;
import org.apache.tuscany.sca.monitor.MonitorFactory;
/**
* Default extension point for javascript proxy factories
*
* @version $Rev$ $Date$
*/
public class DefaultJavascriptProxyFactoryExtensionPoint implements JavascriptProxyFactoryExtensionPoint {
private final Map<QName, JavascriptProxyFactory> factoriesByQName = new HashMap<QName, JavascriptProxyFactory>();
private final Map<Class<?>, JavascriptProxyFactory> factoriesByType = new HashMap<Class<?>, JavascriptProxyFactory>();
private Monitor monitor = null;
private ExtensionPointRegistry registry;
private boolean loaded = false;
public DefaultJavascriptProxyFactoryExtensionPoint(ExtensionPointRegistry extensionPoints) {
this.registry = extensionPoints;
UtilityExtensionPoint utilities = extensionPoints.getExtensionPoint(UtilityExtensionPoint.class);
MonitorFactory monitorFactory = utilities.getUtility(MonitorFactory.class);
if (monitorFactory != null) {
this.monitor = monitorFactory.createMonitor();
}
}
/**
* Report a exception.
*
* @param problems
* @param message
* @param model
*/
private void error(String message, Object model, Exception ex) {
/*
if (monitor != null) {
Problem problem =
monitor.createProblem(this.getClass().getName(),
Messages.RESOURCE_BUNDLE,
Severity.WARNING,
model,
message,
(Object[])messageParameters);
monitor.problem(problem);
}
*/
}
public void addProxyFactory(JavascriptProxyFactory javascriptProxyfactory) {
if (javascriptProxyfactory.getModelType() != null) {
factoriesByType.put(javascriptProxyfactory.getModelType(), javascriptProxyfactory);
}
if (javascriptProxyfactory.getQName() != null) {
factoriesByQName.put(javascriptProxyfactory.getQName(), javascriptProxyfactory);
}
}
public void removeProxyFactory(JavascriptProxyFactory javascriptProxyfactory) {
if (javascriptProxyfactory.getModelType() != null) {
factoriesByType.remove(javascriptProxyfactory.getModelType());
}
if (javascriptProxyfactory.getQName() != null) {
factoriesByQName.remove(javascriptProxyfactory.getQName());
}
}
public JavascriptProxyFactory getProxyFactory(QName bindingName) {
loadFactories();
return factoriesByQName.get(bindingName);
}
public JavascriptProxyFactory getProxyFactory(Class<?> bindingType) {
loadFactories();
Class<?>[] classes = bindingType.getInterfaces();
for (Class<?> c : classes) {
JavascriptProxyFactory proxyFactory = factoriesByType.get(c);
if (proxyFactory != null) {
return proxyFactory;
}
}
//here we didn't find the proxy factory for the biding
JavascriptProxyFactory factory = null;
if (bindingType.isInterface()) {
// Dynamically load a factory class declared under META-INF/services
try {
Class<?> factoryClass = registry.getServiceDiscovery().getServiceDeclaration(bindingType).getClass();
if (factoryClass != null) {
try {
// Default empty constructor
Constructor<?> constructor = factoryClass.getConstructor();
factory = (JavascriptProxyFactory) constructor.newInstance();
} catch (NoSuchMethodException e) {
// Constructor taking the model factory extension point
Constructor<?> constructor = factoryClass.getConstructor(FactoryExtensionPoint.class);
factory = (JavascriptProxyFactory) constructor.newInstance(this);
}
// Cache the loaded factory
addProxyFactory(factory);
}
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
} else {
// Call the newInstance static method on the factory abstract class
try {
factory = (JavascriptProxyFactory) ServiceDiscovery.getInstance().getServiceDeclaration(bindingType);
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
// Cache the factory
addProxyFactory(factory);
}
return factory;
}
/**
* Private Utility methods
*/
/**
* Returns a QName object from a QName expressed as {ns}name
* or ns#name.
*
* @param qname
* @return
*/
private static QName getQName(String qname) {
if (qname == null) {
return null;
}
qname = qname.trim();
if (qname.startsWith("{")) {
int h = qname.indexOf('}');
if (h != -1) {
return new QName(qname.substring(1, h), qname.substring(h + 1));
}
} else {
int h = qname.indexOf('#');
if (h != -1) {
return new QName(qname.substring(0, h), qname.substring(h + 1));
}
}
throw new IllegalArgumentException("Invalid qname: "+qname);
}
/**
* Lazily load artifact processors registered in the extension point.
*/
private synchronized void loadFactories() {
if (loaded) {
return;
}
// Get the proxy factories declarations
Collection<ServiceDeclaration> factoryDeclarations = null;
try {
factoryDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(JavascriptProxyFactory.class);
} catch (IOException e) {
IllegalStateException ie = new IllegalStateException(e);
error("IllegalStateException", factoryDeclarations, ie);
throw ie;
}
for (ServiceDeclaration processorDeclaration : factoryDeclarations) {
Map<String, String> attributes = processorDeclaration.getAttributes();
// Load a StAX artifact processor
// Get the model QName
QName artifactType = getQName(attributes.get("qname"));
// Get the model class name
String modelTypeName = attributes.get("model");
// Create a factory, and register it
JavascriptProxyFactory proxyFactory = null;
try {
proxyFactory = (JavascriptProxyFactory) processorDeclaration.loadClass().newInstance();
} catch (Exception e) {
IllegalStateException ie = new IllegalStateException(e);
error("IllegalStateException", proxyFactory, ie);
throw ie;
}
addProxyFactory(proxyFactory);
}
loaded = true;
}
}
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