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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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.tuscany.container.java.invocation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Set;
import org.apache.tuscany.core.config.JavaIntrospectionHelper;
import org.apache.tuscany.core.context.TargetException;
import org.apache.tuscany.core.wire.Interceptor;
import org.apache.tuscany.core.wire.InvocationRuntimeException;
import org.apache.tuscany.core.wire.TargetInvoker;
import org.apache.tuscany.core.message.Message;
/**
* Base class for dispatching to a Java based component implementation. Subclasses implement a strategy for resolving
* implementation instances.
*
* @version $Rev$ $Date$
*/
public abstract class AbstractJavaComponentInvoker implements TargetInvoker {
protected Method operation;
public AbstractJavaComponentInvoker(Method operation) {
assert (operation != null) : "Operation method cannot be null";
this.operation = operation;
}
public Object invokeTarget(Object payload) throws InvocationTargetException {
try {
Object instance = getInstance();
if (!operation.getDeclaringClass().isInstance(instance)) {
Set<Method> methods = JavaIntrospectionHelper.getAllUniqueMethods(instance.getClass());
Method newOperation = JavaIntrospectionHelper.findClosestMatchingMethod(operation.getName(), operation
.getParameterTypes(), methods);
if (newOperation != null)
operation = newOperation;
}
if (payload != null && !payload.getClass().isArray()) {
return operation.invoke(instance, payload);
} else {
return operation.invoke(instance, (Object[]) payload);
}
} catch (IllegalAccessException e) {
throw new InvocationRuntimeException(e);
}
}
public Message invoke(Message msg) {
try {
Object resp = invokeTarget(msg.getBody());
msg.setBody(resp);
} catch (InvocationTargetException e) {
msg.setBody(e.getCause());
} catch (Throwable e) {
msg.setBody(e);
}
return msg;
}
protected abstract Object getInstance() throws TargetException;
public void setNext(Interceptor next) {
throw new IllegalStateException("This interceptor must be the last interceptor in an interceptor chain");
}
@Override
public Object clone() throws CloneNotSupportedException {
try {
AbstractJavaComponentInvoker clone = (AbstractJavaComponentInvoker) super.clone();
clone.operation = this.operation;
return clone;
} catch (CloneNotSupportedException e) {
return null; // will not happen
}
}
}
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