// Copyright 2006, 2007, 2008, 2009, 2011 The Apache Software Foundation
//
// Licensed 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.tapestry5.ioc.internal;
import org.apache.tapestry5.ioc.Invokable;
import org.apache.tapestry5.ioc.OperationTracker;
import org.apache.tapestry5.ioc.ServiceBuilderResources;
import org.apache.tapestry5.ioc.internal.util.InternalUtils;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Basic implementation of {@link org.apache.tapestry5.ioc.ObjectCreator} that handles invoking a method on the module
* builder, and figures out the correct parameters to pass into the annotated method.
*/
public class ServiceBuilderMethodInvoker extends AbstractServiceCreator
{
private final Method builderMethod;
public ServiceBuilderMethodInvoker(ServiceBuilderResources resources, String creatorDescription, Method method)
{
super(resources, creatorDescription);
builderMethod = method;
}
/**
* Invoked from the proxy to create the actual service implementation.
*/
public Object createObject()
{
// Defer getting (and possibly instantitating) the module instance until the last possible
// moment. If the method is static, there's no need to even get the builder.
final Object moduleInstance = InternalUtils.isStatic(builderMethod) ? null : resources.getModuleBuilder();
final OperationTracker tracker = resources.getTracker();
return tracker.invoke(String.format("Invoking " + creatorDescription), new Invokable<Object>()
{
public Object invoke()
{
final OperationTracker tracker = resources.getTracker();
Object result = null;
Throwable failure = null;
try
{
Object[] parameters = InternalUtils.calculateParametersForMethod(builderMethod, resources,
createInjectionResources(), tracker);
if (logger.isDebugEnabled())
logger.debug(IOCMessages.invokingMethod(creatorDescription));
result = builderMethod.invoke(moduleInstance, parameters);
}
catch (InvocationTargetException ite)
{
failure = ite.getTargetException();
}
catch (Exception ex)
{
failure = ex;
}
if (failure != null)
throw new RuntimeException(IOCMessages.builderMethodError(creatorDescription, serviceId, failure),
failure);
if (result == null)
throw new RuntimeException(IOCMessages.builderMethodReturnedNull(creatorDescription, serviceId));
return result;
}
});
}
@Override
public String toString()
{
return creatorDescription;
}
}