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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.core.databinding.wire;
import java.util.List;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.UtilityExtensionPoint;
import org.apache.tuscany.sca.databinding.Mediator;
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.invocation.Interceptor;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.invocation.Phase;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
import org.apache.tuscany.sca.runtime.RuntimeEndpointReference;
import org.apache.tuscany.sca.runtime.RuntimeWireProcessor;
/**
* This processor is responsible to add an interceptor to invocation chain if
* the source and target operations have different databinding requirements
*
* @version $Rev$ $Date$
*/
public class DataBindingRuntimeWireProcessor implements RuntimeWireProcessor {
private Mediator mediator;
public DataBindingRuntimeWireProcessor(ExtensionPointRegistry registry) {
super();
this.mediator = registry.getExtensionPoint(UtilityExtensionPoint.class).getUtility(Mediator.class);
}
public boolean isTransformationRequired(DataType source, DataType target) {
if (source == null || target == null) { // void return type
return false;
}
if (source == target) {
return false;
}
// Output type can be null
if (source == null && target == null) {
return false;
} else if (source == null || target == null) {
return true;
}
String sourceDataBinding = source.getDataBinding();
String targetDataBinding = target.getDataBinding();
if (sourceDataBinding == targetDataBinding) {
return false;
}
if (sourceDataBinding == null || targetDataBinding == null) {
// TODO: If any of the databinding is null, then no transformation
return false;
}
return !sourceDataBinding.equals(targetDataBinding);
}
public boolean isTransformationRequired(Operation source, Operation target) {
if (source == target) {
return false;
}
if (source.isWrapperStyle() != target.isWrapperStyle()) {
return true;
}
// Check output type
DataType sourceOutputType = source.getOutputType();
DataType targetOutputType = target.getOutputType();
// Note the target output type is now the source for checking
// compatibility
if (isTransformationRequired(targetOutputType, sourceOutputType)) {
return true;
}
List<DataType> sourceInputType = source.getInputType().getLogical();
List<DataType> targetInputType = target.getInputType().getLogical();
int size = sourceInputType.size();
if (size != targetInputType.size()) {
// TUSCANY-1682: The wrapper style may have different arguments
return true;
}
for (int i = 0; i < size; i++) {
if (isTransformationRequired(sourceInputType.get(i), targetInputType.get(i))) {
return true;
}
}
return false;
}
private boolean isTransformationRequired(InterfaceContract sourceContract,
Operation sourceOperation,
InterfaceContract targetContract,
Operation targetOperation) {
if (targetContract == null) {
targetContract = sourceContract;
}
if (sourceContract == targetContract) {
return false;
}
return isTransformationRequired(sourceOperation, targetOperation);
}
/**
* FIXME: TUSCANY-2586, temporary work around till the JIRA is fixed to prevent
* the PassByValueInterceptor being used for services when the binding protocol
* doesn't need the copies done.
*/
protected boolean isOnMessage(Operation op) {
return "onMessage".equals(op.getName());
}
/**
* Pass-by-value copies are required if the interfaces are remotable unless the
* implementation uses the @AllowsPassByReference annotation.
*/
protected boolean isRemotable(InvocationChain chain, Operation sourceOperation, Operation targetOperation) {
if (!sourceOperation.getInterface().isRemotable()) {
return false;
}
if (!targetOperation.getInterface().isRemotable()) {
return false;
}
return true;
}
public void process(RuntimeEndpoint endpoint) {
InterfaceContract sourceContract = endpoint.getBindingInterfaceContract();
InterfaceContract targetContract = endpoint.getComponentTypeServiceInterfaceContract();
if (targetContract == null) {
targetContract = sourceContract;
}
if (!sourceContract.getInterface().isRemotable()) {
return;
}
List<InvocationChain> chains = endpoint.getInvocationChains();
for (InvocationChain chain : chains) {
Operation sourceOperation = chain.getSourceOperation();
Operation targetOperation = chain.getTargetOperation();
Interceptor interceptor = null;
if (isTransformationRequired(sourceContract, sourceOperation, targetContract, targetOperation)) {
// Add the interceptor to the source side because multiple
// references can be wired to the same service
interceptor =
new DataTransformationInterceptor(endpoint, sourceOperation, targetOperation, mediator);
} else {
// assume pass-by-values copies are required if interfaces are remotable and there is no data binding
// transformation, i.e. a transformation will result in a copy so another pass-by-value copy is unnecessary
if (!isOnMessage(targetOperation) && isRemotable(chain, sourceOperation, targetOperation)) {
interceptor =
new PassByValueInterceptor(mediator, chain, targetOperation);
}
}
if (interceptor != null) {
String phase = Phase.SERVICE_INTERFACE;
chain.addInterceptor(phase, interceptor);
}
}
}
public void process(RuntimeEndpointReference endpointReference) {
InterfaceContract sourceContract = endpointReference.getComponentTypeReferenceInterfaceContract();
InterfaceContract targetContract = endpointReference.getBindingInterfaceContract();
if (targetContract == null) {
targetContract = sourceContract;
}
if (!sourceContract.getInterface().isRemotable()) {
return;
}
List<InvocationChain> chains = endpointReference.getInvocationChains();
for (InvocationChain chain : chains) {
Operation sourceOperation = chain.getSourceOperation();
Operation targetOperation = chain.getTargetOperation();
Interceptor interceptor = null;
if (isTransformationRequired(sourceContract, sourceOperation, targetContract, targetOperation)) {
// Add the interceptor to the source side because multiple
// references can be wired to the same service
interceptor =
new DataTransformationInterceptor(endpointReference, sourceOperation, targetOperation, mediator);
} else {
// assume pass-by-values copies are required if interfaces are remotable and there is no data binding
// transformation, i.e. a transformation will result in a copy so another pass-by-value copy is unnecessary
if (!isOnMessage(targetOperation) && isRemotable(chain, sourceOperation, targetOperation)) {
interceptor =
new PassByValueInterceptor(mediator, chain, targetOperation);
}
}
if (interceptor != null) {
String phase = Phase.REFERENCE_INTERFACE;
chain.addInterceptor(phase, interceptor);
}
}
}
}
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