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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.osgi.runtime;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.IdentityHashMap;
import java.util.Map;
import org.apache.tuscany.sca.databinding.DataBinding;
import org.apache.tuscany.sca.databinding.DataBindingExtensionPoint;
import org.apache.tuscany.sca.implementation.osgi.context.OSGiAnnotations;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.DataExchangeSemantics;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
/**
* An interceptor to enforce pass-by-value semantics for remotable interfaces
*
* @version $Rev$ $Date$
*/
public class OSGiRemotableInvoker extends OSGiTargetInvoker implements DataExchangeSemantics {
private DataBindingExtensionPoint registry;
private Operation operation;
private OSGiAnnotations osgiAnnotations;
/**
* @param registry
* @param operation
* @param method
* @param component
*/
public OSGiRemotableInvoker(OSGiAnnotations osgiAnnotations,
DataBindingExtensionPoint registry,
Operation operation,
OSGiImplementationProvider provider,
RuntimeComponentService service) {
super(operation, provider, service);
this.osgiAnnotations = osgiAnnotations;
this.registry = registry;
this.operation = operation;
}
@Override
public Object invokeMethod(Object targetObject, Method m, Message msg) throws InvocationTargetException {
Object result;
if (osgiAnnotations.isAllowsPassByReference(targetObject, m)) {
result = super.invokeMethod(targetObject, m, msg);
} else {
Object obj = msg.getBody();
msg.setBody(copy((Object[])obj));
result = super.invokeMethod(targetObject, m, msg);
if (operation.getOutputType() != null) {
String dataBindingId = operation.getOutputType().getDataBinding();
DataBinding dataBinding = registry.getDataBinding(dataBindingId);
result = copy(result, operation.getOutputType(), dataBinding);
}
}
return result;
}
public Object[] copy(Object[] args) {
if (args == null) {
return null;
}
Object[] copiedArgs = new Object[args.length];
Map<Object, Object> map = new IdentityHashMap<Object, Object>();
for (int i = 0; i < args.length; i++) {
if (args[i] == null) {
copiedArgs[i] = null;
} else {
Object copiedArg = map.get(args[i]);
if (copiedArg != null) {
copiedArgs[i] = copiedArg;
} else {
DataType dt = operation.getInputType().getLogical().get(i);
String dataBindingId = dt.getDataBinding();
DataBinding dataBinding = registry.getDataBinding(dataBindingId);
copiedArg = copy(args[i], dt, dataBinding);
map.put(args[i], copiedArg);
copiedArgs[i] = copiedArg;
}
}
}
return copiedArgs;
}
public Object copy(Object arg, DataType dataType, DataBinding argDataBinding) {
if (arg == null) {
return null;
}
Object copiedArg;
if (argDataBinding != null) {
copiedArg = argDataBinding.copy(arg, dataType, operation);
} else {
copiedArg = arg;
dataType = registry.introspectType(arg, operation);
if (dataType != null) {
DataBinding binding = registry.getDataBinding(dataType.getDataBinding());
if (binding != null) {
copiedArg = binding.copy(arg, dataType, operation);
}
}
// FIXME: What to do if it's not recognized?
}
return copiedArg;
}
/**
* @see org.apache.tuscany.sca.invocation.PassByValueAware#allowsPassByReference()
*/
public boolean allowsPassByReference() {
return true;
}
}
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