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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.implementation.java.invocation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import javax.xml.ws.Holder;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.core.factory.ObjectCreationException;
import org.apache.tuscany.sca.core.scope.Scope;
import org.apache.tuscany.sca.core.scope.ScopeContainer;
import org.apache.tuscany.sca.core.scope.ScopedRuntimeComponent;
import org.apache.tuscany.sca.implementation.java.JavaImplementation;
import org.apache.tuscany.sca.implementation.java.context.ReflectiveInstanceWrapper;
import org.apache.tuscany.sca.implementation.java.injection.Injector;
import org.apache.tuscany.sca.implementation.java.introspect.JavaIntrospectionHelper;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.ParameterMode;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
import org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceUtil;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.oasisopen.sca.ServiceReference;
import org.oasisopen.sca.ServiceRuntimeException;
/**
* Responsible for synchronously dispatching an invocation to a Java component
* implementation instance
*
* @version $Rev$ $Date$
*/
public class JavaImplementationInvoker implements Invoker {
protected Operation operation;
protected Method method;
protected boolean allowsPBR;
@SuppressWarnings("unchecked")
protected final ScopeContainer scopeContainer;
private final InterfaceContract interfaze;
public JavaImplementationInvoker(Operation operation, Method method, RuntimeComponent component, InterfaceContract intf) {
assert method != null : "Operation method cannot be null";
this.method = method;
this.operation = operation;
this.scopeContainer = ((ScopedRuntimeComponent)component).getScopeContainer();
this.allowsPBR = ((JavaImplementation)component.getImplementation()).isAllowsPassByReference(method);
this.interfaze = intf;
}
public JavaImplementationInvoker(Operation operation, RuntimeComponent component, InterfaceContract intf) {
// used if the method can't be computed statically in advance
this.operation = operation;
this.scopeContainer = ((ScopedRuntimeComponent)component).getScopeContainer();
this.interfaze = intf;
}
@SuppressWarnings("unchecked")
public Message invoke(Message msg) {
Operation op = msg.getOperation();
if (op == null) {
op = this.operation;
}
Object payload = msg.getBody();
Object contextId = null;
EndpointReference from = msg.getFrom();
// store the current thread context classloader
// as we need to replace it with the class loader
// used to load the java class as per SCA Spec
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
try {
// The following call might create a new conversation, as a result, the msg.getConversationID() might
// return a new value
ReflectiveInstanceWrapper wrapper = (ReflectiveInstanceWrapper) scopeContainer.getWrapper(contextId);
// If there is a callback interface and the implementation is stateless, we need to
// inject callbacks at invocation time. For Composite scope, this has already been done.
if (( interfaze.getCallbackInterface() != null ) && (scopeContainer.getScope().equals(Scope.STATELESS))){
injectCallbacks(wrapper, (JavaInterface)interfaze.getCallbackInterface());
}
Object instance = wrapper.getInstance();
// If the method couldn't be computed statically, or the instance being
// invoked is a user-specified callback object that doesn't implement
// the service interface from which the reflective method was obtained,
// compute the method object dynamically for this invocation.
Method imethod = method;
if (imethod == null || !imethod.getDeclaringClass().isInstance(instance)) {
try {
imethod = JavaInterfaceUtil.findMethod(instance.getClass(), operation);
} catch (NoSuchMethodException e) {
throw new IllegalArgumentException("Callback object does not provide method " + e.getMessage());
}
}
// Set the thread context classloader of the thread used to invoke an operation
// of a Java POJO component implementation is the class loader of the contribution
// that contains the POJO implementation class.
Thread.currentThread().setContextClassLoader(instance.getClass().getClassLoader());
int argumentHolderCount = 0;
// Holder pattern. Any payload parameters <T> which are should be in holders are placed in Holder<T>.
// Only check Holder for remotable interfaces
if (imethod != null && op.getInterface().isRemotable()) {
List<DataType> inputTypes = op.getInputType().getLogical();
for (int i = 0, size = inputTypes.size(); i < size; i++) {
if (ParameterMode.IN != op.getParameterModes().get(i)) {
// Promote array params from [<T>] to [Holder<T>]
Object[] payloadArray = (Object[])payload;
if ( ParameterMode.INOUT == op.getParameterModes().get(i)) {
Object item = payloadArray[i];
payloadArray[i] = new Holder(item);
} else {
// Create an empty Holder since we should not pass values for OUT parameters
payloadArray[i] = new Holder();
}
argumentHolderCount++;
}
}
}
Object ret;
if (payload != null && !payload.getClass().isArray()) {
ret = imethod.invoke(instance, payload);
} else {
ret = imethod.invoke(instance, (Object[])payload);
}
scopeContainer.returnWrapper(wrapper, contextId);
if (argumentHolderCount > 0) {
// Holder pattern. Any payload Holder<T> types are returned as part of the message body.
Object[] payloadArray = (Object[])payload;
ArrayList<Object> result = new ArrayList<Object>();
if (imethod != null) {
result.add(ret);
for (int i = 0, size = op.getParameterModes().size(); i < size; i++) {
if (ParameterMode.IN != op.getParameterModes().get(i)) {
// Demote array params from Holder<T> to <T>.
Holder<Object> item = (Holder<Object>)payloadArray[i];
payloadArray[i] = item.value;
result.add(payloadArray[i]);
}
}
}
msg.setBody(result.toArray());
} else {
msg.setBody(ret);
}
} catch (InvocationTargetException e) {
Throwable cause = e.getTargetException();
boolean isChecked = false;
for (DataType<?> d : operation.getFaultTypes()) {
if (d.getPhysical().isInstance(cause)) {
isChecked = true;
msg.setFaultBody(cause);
break;
}
}
if (!isChecked) {
if (cause instanceof RuntimeException) {
throw (RuntimeException)cause;
}
if (cause instanceof Error) {
throw (Error)cause;
} else {
throw new ServiceRuntimeException(cause.getMessage(), cause);
}
}
} catch (ObjectCreationException e) {
throw new ServiceRuntimeException(e.getMessage(), e);
} catch (Exception e) {
msg.setFaultBody(e);
} finally {
// set the tccl
Thread.currentThread().setContextClassLoader(tccl);
}
return msg;
}
private void injectCallbacks(ReflectiveInstanceWrapper wrapper,
JavaInterface callbackInterface) {
for (Injector injector : wrapper.getCallbackInjectors()) {
if (injector != null) {
try {
if (ServiceReference.class.isAssignableFrom(injector.getType())) {
Class<?> intf = JavaIntrospectionHelper.getBusinessInterface(injector.getType(), injector.getGenericType());
if ( intf.isAssignableFrom(callbackInterface.getJavaClass())) {
injector.inject(wrapper.getInstance());
}
} else if (injector.getType().isAssignableFrom(callbackInterface.getJavaClass())) {
injector.inject(wrapper.getInstance());
} else {
injector.injectNull(wrapper.getInstance());
}
} catch (Exception e) {
throw new ObjectCreationException("Exception invoking injector - " + e.getMessage(), e);
}
}
}
}
}
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