in modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaImplementationInvoker.java [90:286]
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
final ClassLoader tccl = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
return tccl;
}
});
// TUSCANY-3946 - If the TCCL has not already been set to the contribution classloader earlier
// in the wire processing then
// set it so that 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
// used to load the POJO implementation class.
boolean swapTCCL = (msg.getHeaders().get(Constants.SUPPRESS_TCCL_SWAP) == null);
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))){
// TUSCANY-4000 - injectCallbacks needs the Java callback interface so get it
// from the component type just in case the user has specified a
// WSDL interface and hence interfaze is WSDL
injectCallbacks(wrapper, (JavaInterface)service.getService().getInterfaceContract().getCallbackInterface());
}
final 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());
}
}
if (swapTCCL){
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
Thread.currentThread().setContextClassLoader(instance.getClass().getClassLoader());
return null;
}
});
}
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()) {
Object[] payloadArray = (Object[])payload;
List<Object> payloadList = new ArrayList<Object>();
int nextIndex = 0;
for (ParameterMode mode : op.getParameterModes()) {
if (mode.equals(ParameterMode.IN)) {
payloadList.add(payloadArray[nextIndex++]);
} else if (mode.equals(ParameterMode.INOUT)) {
// Promote array params from [<T>] to [Holder<T>]
Object item = payloadArray[nextIndex++];
Holder itemHolder = new Holder(item);
payloadList.add(itemHolder);
argumentHolderCount++;
} else {
// Create an empty Holder since we should not pass values for OUT parameters
payloadList.add(new Holder());
argumentHolderCount++;
}
}
// Maybe a bit odd to do but this way I don't have to worry about how the invoke if/else
// immediately following might need to be changed.
payload = payloadList.toArray();
}
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> holderOutputs = new ArrayList<Object>();
ArrayList<Object> result = new ArrayList<Object>();
if (imethod != null) {
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;
holderOutputs.add(payloadArray[i]);
}
}
//
// Now we account for the fact that we may have a null because of a void return type,
// which is not part of the output DataType, and so should not be returned with the array
// of outputs, or we may have a null as value returned
// from a method with signature with return type other than void, which should be returned
// in the output array.
//
// The logic here is if we already have as many outputs in holders as we have outputs
// altogether, then we don't worry about the return value (which should be null). Might
// be simpler to just check for void, but the code in the Java introspector has a lot
// of quirks for handling parameterized types, and this seems simpler for now.
//
int holderOutputSize = holderOutputs.size();
int numberOperationOutputs = op.getOutputType().getLogical().size();
if (holderOutputSize == numberOperationOutputs) {
if (ret != null) {
throw new IllegalStateException("Number of holder outputs equal to number of operations outputs." +
"\nNum = " + holderOutputSize + ", but non-null return value seen: " + ret);
}
result = holderOutputs;
} else if (holderOutputSize == numberOperationOutputs - 1) {
result.add(ret);
result.addAll(1, holderOutputs);
} else {
throw new IllegalStateException("Number of holder outputs seen: " + holderOutputSize +
"\nNumber of operation outputs: " + numberOperationOutputs);
}
}
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 {
// reset the tccl if it was replaced above
// with the contribution classloader
if (swapTCCL){
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
Thread.currentThread().setContextClassLoader(tccl);
return null;
}
});
}
}
return msg;
}