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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.core.extension;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.tuscany.core.context.AtomicContext;
import org.apache.tuscany.core.context.Context;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.ScopeContext;
import org.apache.tuscany.core.context.TargetException;
import org.apache.tuscany.core.message.Message;
import org.apache.tuscany.core.wire.Interceptor;
import org.apache.tuscany.core.wire.TargetInvoker;
/**
* Responsible for invoking an external service
* TODO: virtualy identical to ExternalServiceTargetInvoker
* @version $Rev$ $Date$
*/
public class ComponentTargetInvoker implements TargetInvoker {
private QualifiedName serviceName;
private String esName;
private Method method;
private ScopeContext container;
private AtomicContext context;
/**
* Constructs a new ExternalWebServiceTargetInvoker.
*
* @param container
*/
public ComponentTargetInvoker(QualifiedName serviceName, Method method, ScopeContext container) {
assert serviceName != null : "No service name specified";
assert method != null : "No method specified";
assert container != null : "No scope container specified";
this.serviceName = serviceName;
this.esName = serviceName.getPartName();
this.method = method;
this.container = container;
}
public Object invokeTarget(Object payload) throws InvocationTargetException {
if (context == null) {
Context iContext = container.getContext(esName);
if (!(iContext instanceof AtomicContext)) {
TargetException te = new TargetException("Unexpected target context type");
te.setIdentifier(iContext.getClass().getName());
te.addContextName(iContext.getName());
throw te;
}
context = (AtomicContext) iContext;
}
ExternalServiceInvoker invoker = (ExternalServiceInvoker) context.getTargetInstance();
if (payload != null) {
return doInvoke(invoker, (Object[]) payload);
} else {
return doInvoke(invoker, null);
}
}
protected Object doInvoke(ExternalServiceInvoker invoker, Object[] args) {
return invoker.invoke(method.getName(), args);
}
public boolean isCacheable() {
return false;
}
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;
}
public void setNext(Interceptor next) {
throw new UnsupportedOperationException();
}
public Object clone() throws CloneNotSupportedException {
try {
ComponentTargetInvoker invoker = (ComponentTargetInvoker) super.clone();
invoker.container = container;
invoker.context = this.context;
invoker.esName = this.esName;
invoker.method = this.method;
invoker.serviceName = this.serviceName;
return invoker;
} catch (CloneNotSupportedException e) {
// will not happen
return null;
}
}
}
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