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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.interfacedef.java.impl;
import java.io.IOException;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.List;
import java.util.Set;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
import org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceFactoryImpl;
import org.apache.tuscany.sca.interfacedef.java.impl.PolicyJavaInterfaceVisitor;
import org.apache.tuscany.sca.interfacedef.java.introspect.JavaInterfaceVisitor;
import org.apache.tuscany.sca.policy.PolicyFactory;
/**
* A factory for the Java interface model, using Class object as key to cache JavaInterface
*
* @version $Rev$ $Date$
*/
public class ClassCachedJavaInterfaceFactoryImpl extends JavaInterfaceFactoryImpl implements JavaInterfaceFactory {
private ModelFactoryExtensionPoint modelFactoryExtensionPoint;
private boolean loadedVisitors;
private static Cache cache = new Cache();
public ClassCachedJavaInterfaceFactoryImpl () {
}
public ClassCachedJavaInterfaceFactoryImpl(ModelFactoryExtensionPoint modelFactoryExtensionPoint) {
this.modelFactoryExtensionPoint = modelFactoryExtensionPoint;
}
@Override
public List<JavaInterfaceVisitor> getInterfaceVisitors() {
loadVisitors();
return super.getInterfaceVisitors();
}
/**
* Load visitors declared under META-INF/services
*/
@SuppressWarnings("unchecked")
private synchronized void loadVisitors() {
if (loadedVisitors)
return;
if (modelFactoryExtensionPoint != null) {
PolicyFactory policyFactory = modelFactoryExtensionPoint.getFactory(PolicyFactory.class);
if (policyFactory != null) {
addInterfaceVisitor(new PolicyJavaInterfaceVisitor(policyFactory));
}
}
// Get the databinding service declarations
Set<ServiceDeclaration> visitorDeclarations;
try {
visitorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(JavaInterfaceVisitor.class);
} catch (IOException e) {
throw new IllegalStateException(e);
}
// Load data bindings
for (ServiceDeclaration visitorDeclaration: visitorDeclarations) {
JavaInterfaceVisitor visitor;
try {
Class<JavaInterfaceVisitor> visitorClass = (Class<JavaInterfaceVisitor>)visitorDeclaration.loadClass();
visitor = visitorClass.newInstance();
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException(e);
} catch (InstantiationException e) {
throw new IllegalArgumentException(e);
} catch (IllegalAccessException e) {
throw new IllegalArgumentException(e);
}
addInterfaceVisitor(visitor);
}
loadedVisitors = true;
}
public JavaInterface createJavaInterface(Class<?> interfaceClass) throws InvalidInterfaceException {
JavaInterface javaInterface = cache.get(interfaceClass);
if (javaInterface == null) {
javaInterface = super.createJavaInterface(interfaceClass);
cache.put(interfaceClass, javaInterface);
}
return javaInterface;
}
private static class Cache {
private Map<Class,JavaInterface> _cache = new WeakHashMap<Class,JavaInterface>();
public synchronized JavaInterface get(Class<?> interfaceClass) {
return _cache.get(interfaceClass);
}
public synchronized void put(Class<?> interfaceClass, JavaInterface javaInterface) {
_cache.put(interfaceClass, javaInterface);
}
}
}
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