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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.binding;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.net.MalformedURLException;
import java.net.URL;
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.contribution.service.ContributionException;
import org.apache.tuscany.sca.contribution.service.ContributionReadException;
import org.apache.tuscany.sca.contribution.util.ServiceDeclaration;
import org.apache.tuscany.sca.contribution.util.ServiceDiscovery;
/**
* Default implementation of a binding URI calculator extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultBindingURICalculatorExtensionPoint implements BindingURICalculatorExtensionPoint {
private Map<String, BindingURICalculator> bindingURICalculators = new HashMap<String, BindingURICalculator>();
private boolean loaded;
public DefaultBindingURICalculatorExtensionPoint() {
}
public void addBindingURICalculator(BindingURICalculator bindingURICalculator) {
bindingURICalculators.put(bindingURICalculator.getBindingType(), bindingURICalculator);
}
public void removeBindingURICalculator(BindingURICalculator bindingURICalculator) {
bindingURICalculators.remove(bindingURICalculator.getBindingType());
}
public BindingURICalculator getBindingURICalculator(Binding binding) {
loadbindingURICalculators();
return bindingURICalculators.get(binding.getClass().getName());
}
private void loadbindingURICalculators() {
if (loaded)
return;
// Get the bindingURICalculator service declarations
Set<ServiceDeclaration> bindingURICalculatorDeclarations;
try {
bindingURICalculatorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(BindingURICalculator.class);
} catch (IOException e) {
throw new IllegalStateException(e);
}
for (ServiceDeclaration bindingURICalculatorDeclaration: bindingURICalculatorDeclarations) {
Map<String, String> attributes = bindingURICalculatorDeclaration.getAttributes();
// Load a URL artifact bindingURICalculator
String bindingType = attributes.get("binding");
// Create a bindingURICalculator wrapper and register it
BindingURICalculator bindingURICalculator = new LazyBindingURICalculator(bindingType, bindingURICalculatorDeclaration);
addBindingURICalculator(bindingURICalculator);
}
loaded = true;
}
/**
* A facade for contribution bindingURICalculators.
*/
private static class LazyBindingURICalculator implements BindingURICalculator {
private ServiceDeclaration bindingURICalculatorDeclaration;
private String bindingType;
private BindingURICalculator bindingURICalculator;
private LazyBindingURICalculator(String contributionType, ServiceDeclaration bindingURICalculatorDeclaration) {
this.bindingURICalculatorDeclaration = bindingURICalculatorDeclaration;
this.bindingType = contributionType;
}
public String getBindingType() {
return bindingType;
}
public String getProtocol(Binding binding) {
return getbindingURICalculator().getProtocol(binding);
}
private BindingURICalculator getbindingURICalculator() {
if (bindingURICalculator == null) {
try {
Class<BindingURICalculator> bindingURICalculatorClass = (Class<BindingURICalculator>)bindingURICalculatorDeclaration.loadClass();
Constructor<BindingURICalculator> constructor = bindingURICalculatorClass.getConstructor();
bindingURICalculator = constructor.newInstance();
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return bindingURICalculator;
}
}
}
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