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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.core.builder;
import java.util.List;
import java.util.Map;
import org.osoa.sca.annotations.Constructor;
import org.apache.tuscany.spi.QualifiedName;
import org.apache.tuscany.spi.annotation.Autowire;
import org.apache.tuscany.spi.builder.Connector;
import org.apache.tuscany.spi.builder.MissingWireTargetException;
import org.apache.tuscany.spi.builder.WiringException;
import org.apache.tuscany.spi.component.Component;
import org.apache.tuscany.spi.component.CompositeComponent;
import org.apache.tuscany.spi.component.Reference;
import org.apache.tuscany.spi.component.ReferenceBinding;
import org.apache.tuscany.spi.component.SCAObject;
import org.apache.tuscany.spi.component.Service;
import org.apache.tuscany.spi.component.ServiceBinding;
import org.apache.tuscany.spi.component.TargetInvokerCreationException;
import org.apache.tuscany.spi.component.TargetResolutionException;
import org.apache.tuscany.spi.component.WorkContext;
import org.apache.tuscany.spi.idl.java.JavaServiceContract;
import org.apache.tuscany.spi.model.Operation;
import org.apache.tuscany.spi.model.Scope;
import org.apache.tuscany.spi.model.ServiceContract;
import org.apache.tuscany.spi.services.work.WorkScheduler;
import org.apache.tuscany.spi.wire.InboundInvocationChain;
import org.apache.tuscany.spi.wire.InboundWire;
import org.apache.tuscany.spi.wire.IncompatibleServiceContractException;
import org.apache.tuscany.spi.wire.Interceptor;
import org.apache.tuscany.spi.wire.OutboundInvocationChain;
import org.apache.tuscany.spi.wire.OutboundWire;
import org.apache.tuscany.spi.wire.TargetInvoker;
import org.apache.tuscany.spi.wire.WirePostProcessorRegistry;
import org.apache.tuscany.spi.wire.WireService;
import org.apache.tuscany.core.wire.LoopBackWire;
import org.apache.tuscany.core.wire.NonBlockingBridgingInterceptor;
import org.apache.tuscany.core.wire.SynchronousBridgingInterceptor;
import org.apache.tuscany.core.wire.WireUtils;
/**
* The default connector implmentation
*
* @version $$Rev$$ $$Date$$
*/
public class ConnectorImpl implements Connector {
private WirePostProcessorRegistry postProcessorRegistry;
private WireService wireService;
private WorkContext workContext;
private WorkScheduler scheduler;
public ConnectorImpl() {
}
@Constructor
public ConnectorImpl(@Autowire WireService wireService,
@Autowire WirePostProcessorRegistry processorRegistry,
@Autowire WorkScheduler scheduler,
@Autowire WorkContext workContext) {
this.postProcessorRegistry = processorRegistry;
this.wireService = wireService;
this.scheduler = scheduler;
this.workContext = workContext;
}
public void connect(SCAObject source) throws WiringException {
if (source instanceof Component) {
handleComponent((Component) source);
} else if (source instanceof Reference) {
handleReference((Reference) source);
} else if (source instanceof Service) {
handleService((Service) source);
} else {
throw new AssertionError("Invalid source type");
}
}
public void connect(InboundWire sourceWire, OutboundWire targetWire, boolean optimizable)
throws WiringException {
Map<Operation<?>, OutboundInvocationChain> targetChains = targetWire.getInvocationChains();
if (sourceWire.getContainer() != null && sourceWire.getContainer().isSystem()) {
sourceWire.setTargetWire(targetWire);
// system services do not need to have their chains processed, return
return;
}
for (InboundInvocationChain inboundChain : sourceWire.getInvocationChains().values()) {
// match invocation chains
OutboundInvocationChain outboundChain = targetChains.get(inboundChain.getOperation());
if (outboundChain == null) {
throw new IncompatibleInterfacesException(sourceWire, targetWire);
}
connect(inboundChain, outboundChain);
}
if (postProcessorRegistry != null) {
// run wire post-processors
postProcessorRegistry.process(sourceWire, targetWire);
}
if (optimizable && WireUtils.isOptimizable(sourceWire) && WireUtils.isOptimizable(targetWire)) {
sourceWire.setOptimizable(true);
sourceWire.setTargetWire(targetWire);
}
}
/**
* Connects the source outbound wire to a corresponding target inbound wire
*
* @param sourceWire the source wire to connect
* @param targetWire the target wire to connect to
* @param optimizable true if the wire connection can be optimized
* @throws WiringException
*/
public void connect(OutboundWire sourceWire, InboundWire targetWire, boolean optimizable)
throws WiringException {
SCAObject source = sourceWire.getContainer();
assert source != null;
SCAObject target = targetWire.getContainer();
assert target != null;
Map<Operation<?>, InboundInvocationChain> targetChains = targetWire.getInvocationChains();
if (sourceWire.getContainer() != null && sourceWire.getContainer().isSystem()) {
sourceWire.setTargetWire(targetWire);
// system services do not need to have their chains processed, return
return;
}
// FIXME: [rfeng] The targetWire is provided by the system
if (targetWire.getContainer() != null && targetWire.getContainer().isSystem()) {
sourceWire.setOptimizable(true);
sourceWire.setTargetWire(targetWire);
// system services do not need to have their chains processed, return
return;
}
// match outbound to inbound chains
for (OutboundInvocationChain outboundChain : sourceWire.getInvocationChains().values()) {
Operation<?> operation = outboundChain.getOperation();
// TODO: TUSCANY-1111, can't use targetChains.get with different IDLs so use simple name matching
// InboundInvocationChain inboundChain = targetChains.get(operation);
InboundInvocationChain inboundChain = null; // = targetChains.get(operation);
for (InboundInvocationChain ic: targetChains.values()) {
if (ic.getOperation().equals(operation)) {
inboundChain = ic;
break;
}
}
if (inboundChain == null) {
throw new IncompatibleInterfacesException(sourceWire, targetWire);
}
Operation<?> inboundOperation = inboundChain.getOperation();
boolean isOneWayOperation = operation.isNonBlocking();
TargetInvoker invoker;
if (target instanceof Component) {
Component component = (Component) target;
QualifiedName wireTargetName = sourceWire.getTargetName();
String portName = null;
if (wireTargetName != null) {
portName = wireTargetName.getPortName();
}
try {
invoker = component.createTargetInvoker(portName, inboundOperation, targetWire);
} catch (TargetInvokerCreationException e) {
throw new WireConnectException("Error connecting source and target", sourceWire, targetWire, e);
}
} else if (target instanceof ReferenceBinding) {
ReferenceBinding referenceBinding = (ReferenceBinding) target;
try {
invoker = referenceBinding.createTargetInvoker(targetWire.getServiceContract(), inboundOperation);
} catch (TargetInvokerCreationException e) {
String targetName = targetWire.getContainer().getName();
throw new WireConnectException("Error processing inbound wire", null, null, targetName, null, e);
}
} else if (target instanceof ServiceBinding) {
ServiceBinding binding = (ServiceBinding) target;
try {
invoker = binding.createTargetInvoker(targetWire.getServiceContract(), inboundChain.getOperation());
} catch (TargetInvokerCreationException e) {
String targetName = targetWire.getContainer().getName();
throw new WireConnectException("Error processing inbound wire", null, null, targetName, null, e);
}
} else {
throw new AssertionError();
}
if (source instanceof ServiceBinding) {
// services are a special case: invoker must go on the inbound and outbound chains
if (target instanceof Component && isOneWayOperation) {
// if the target is a component and the operation is non-blocking
connect(outboundChain, inboundChain, invoker, true);
} else {
connect(outboundChain, inboundChain, invoker, false);
}
ServiceBinding binding = (ServiceBinding) source;
InboundInvocationChain chain = binding.getInboundWire().getInvocationChains().get(operation);
chain.setTargetInvoker(invoker);
} else {
if (target instanceof Component && isOneWayOperation) {
// if the target is a component and the operation is non-blocking
connect(outboundChain, inboundChain, invoker, true);
} else {
connect(outboundChain, inboundChain, invoker, false);
}
}
}
// create source callback chains and connect them if target callback chains exist
Map<Operation<?>, OutboundInvocationChain> sourceCallbackChains =
targetWire.getSourceCallbackInvocationChains(source.getName());
for (InboundInvocationChain inboundChain : sourceWire.getTargetCallbackInvocationChains().values()) {
Operation<?> operation = inboundChain.getOperation();
if (sourceCallbackChains != null && sourceCallbackChains.get(operation) != null) {
String opName = operation.getName();
throw new IllegalCallbackException("Source callback chain should not exist for operation",
opName,
sourceWire,
targetWire);
}
ServiceContract<?> targetContract = targetWire.getServiceContract();
assert targetContract != null;
String opName = operation.getName();
assert opName != null;
Operation targetOp = targetContract.getCallbackOperations().get(opName);
OutboundInvocationChain outboundChain = wireService.createOutboundChain(targetOp);
targetWire.addSourceCallbackInvocationChain(source.getName(), targetOp, outboundChain);
if (source instanceof Component) {
Component component = (Component) source;
TargetInvoker invoker;
try {
invoker = component.createTargetInvoker(targetOp.getName(), operation, null);
} catch (TargetInvokerCreationException e) {
throw new WireConnectException("Error connecting source and target", sourceWire, targetWire, e);
}
boolean isOneWayOperation = targetOp.isNonBlocking();
if (target instanceof Component && isOneWayOperation) {
// if the target is a component and the operation is non-blocking
connect(outboundChain, inboundChain, invoker, true);
} else {
connect(outboundChain, inboundChain, invoker, false);
}
} else if (source instanceof ReferenceBinding) {
ReferenceBinding binding = (ReferenceBinding) source;
ServiceContract sourceContract = sourceWire.getServiceContract();
TargetInvoker invoker;
try {
invoker = binding.createTargetInvoker(sourceContract, operation);
} catch (TargetInvokerCreationException e) {
throw new WireConnectException("Error connecting source and target", sourceWire, targetWire, e);
}
connect(outboundChain, inboundChain, invoker, false);
} else if (source instanceof ServiceBinding) {
ServiceBinding binding = (ServiceBinding) source;
ServiceContract sourceContract = sourceWire.getServiceContract();
TargetInvoker invoker;
try {
invoker = binding.createTargetInvoker(sourceContract, operation);
} catch (TargetInvokerCreationException e) {
String targetName = sourceWire.getContainer().getName();
throw new WireConnectException("Error processing callback wire", null, null, targetName, null, e);
}
connect(outboundChain, inboundChain, invoker, false);
} else {
throw new AssertionError();
}
}
if (postProcessorRegistry != null) {
// run wire post-processors
postProcessorRegistry.process(sourceWire, targetWire);
}
// perform optimization, if possible
if (optimizable && WireUtils.isOptimizable(sourceWire) && WireUtils.isOptimizable(targetWire)) {
sourceWire.setOptimizable(true);
sourceWire.setTargetWire(targetWire);
}
}
/**
* Connects a source to target chain
*
* @param sourceChain the source chain
* @param targetChain the target chain
* @param invoker the invoker to place on the source chain for dispatching invocations
* @param nonBlocking true if the operation is non-blocking
*/
protected void connect(OutboundInvocationChain sourceChain,
InboundInvocationChain targetChain,
TargetInvoker invoker,
boolean nonBlocking) throws WireConnectException {
Interceptor head = targetChain.getHeadInterceptor();
if (head == null) {
throw new WireConnectException("Inbound chain must contain at least one interceptor");
}
if (nonBlocking) {
sourceChain.setTargetInterceptor(new NonBlockingBridgingInterceptor(scheduler, workContext, head));
} else {
sourceChain.setTargetInterceptor(new SynchronousBridgingInterceptor(head));
}
sourceChain.prepare();
sourceChain.setTargetInvoker(invoker);
}
/**
* Connects an inbound source chain to an outbound target chain
*
* @param sourceChain the source chain to connect
* @param targetChain the target chain to connect
*/
protected void connect(InboundInvocationChain sourceChain, OutboundInvocationChain targetChain)
throws WireConnectException {
Interceptor head = targetChain.getHeadInterceptor();
if (head == null) {
throw new WireConnectException("Outbound chain must contain at least one interceptor");
}
// invocations from inbound to outbound chains are always synchronous as they occur in services and references
sourceChain.addInterceptor(new SynchronousBridgingInterceptor(head));
}
/**
* Connects an outbound wire to its target in a composite.
*
* @param sourceWire the source wire to connect
* @throws WiringException
*/
protected void connect(SCAObject source, OutboundWire sourceWire, SCAObject target) throws WiringException {
assert sourceWire.getTargetName() != null;
QualifiedName targetName = sourceWire.getTargetName();
if (target instanceof Component) {
connect(source, sourceWire, (Component) target);
} else if (target instanceof Reference) {
connect(source, sourceWire, (Reference) target);
} else if (target instanceof Service) {
connect(source, sourceWire, (Service) target);
} else if (target == null) {
String sourceName = sourceWire.getContainer().getName();
String sourceReference = sourceWire.getReferenceName();
throw new TargetServiceNotFoundException("Target service not found",
sourceName,
sourceReference,
targetName.getPartName(),
targetName.getPortName());
} else {
String sourceName = sourceWire.getContainer().getName();
String sourceRef = sourceWire.getReferenceName();
String partName = targetName.getPartName();
String portName = targetName.getPortName();
throw new InvalidTargetTypeException("Invalid target type", sourceName, sourceRef, partName, portName);
}
}
protected void connect(SCAObject source, OutboundWire sourceWire, Reference target) throws WiringException {
assert sourceWire.getTargetName() != null;
QualifiedName targetName = sourceWire.getTargetName();
InboundWire targetWire = null;
for (ReferenceBinding binding : target.getReferenceBindings()) {
InboundWire candidate = binding.getInboundWire();
if (sourceWire.getBindingType().equals(candidate.getBindingType())) {
targetWire = candidate;
break;
}
}
if (targetWire == null) {
if (target.getReferenceBindings().size() > 0 && source instanceof Component) {
// TODO create a pluggable algorithm for selecting the binding type
targetWire = target.getReferenceBindings().get(0).getInboundWire();
}
if (targetWire == null) {
throw new NoCompatibleBindingsException(source.getName(),
targetName.getPartName(),
targetName.getPortName());
}
}
checkIfWireable(sourceWire, targetWire);
boolean optimizable = isOptimizable(source.getScope(), target.getScope());
connect(sourceWire, targetWire, optimizable);
}
protected void connect(SCAObject source, OutboundWire sourceWire, Service target) throws WiringException {
assert sourceWire.getTargetName() != null;
QualifiedName targetName = sourceWire.getTargetName();
InboundWire targetWire = null;
for (ServiceBinding binding : target.getServiceBindings()) {
InboundWire candidate = binding.getInboundWire();
if (sourceWire.getBindingType().equals(candidate.getBindingType())) {
targetWire = candidate;
break;
}
}
if (targetWire == null) {
throw new NoCompatibleBindingsException(source.getName(),
targetName.getPartName(),
targetName.getPortName());
}
checkIfWireable(sourceWire, targetWire);
boolean optimizable = isOptimizable(source.getScope(), target.getScope());
connect(sourceWire, targetWire, optimizable);
}
protected void connect(SCAObject source, OutboundWire sourceWire, Component target)
throws WiringException {
assert sourceWire.getTargetName() != null;
QualifiedName targetName = sourceWire.getTargetName();
InboundWire targetWire;
// FIXME JFM should we move getInboundSystemWire up to Component?
if (target instanceof CompositeComponent && source.isSystem()) {
targetWire = ((CompositeComponent) target).getInboundSystemWire(targetName.getPortName());
} else {
targetWire = target.getInboundWire(targetName.getPortName());
}
if (targetWire == null) {
String sourceName = sourceWire.getContainer().getName();
String sourceReference = sourceWire.getReferenceName();
throw new TargetServiceNotFoundException("Target service does not exist or is not configured with a "
+ "local binding",
sourceName,
sourceReference,
targetName.getPartName(),
targetName.getPortName());
}
checkIfWireable(sourceWire, targetWire);
boolean optimizable = isOptimizable(source.getScope(), target.getScope());
connect(sourceWire, targetWire, optimizable);
}
protected void autowire(OutboundWire outboundWire, CompositeComponent parent)
throws WiringException {
// JFM FIXME test coverage for this method
InboundWire targetWire;
try {
Class interfaze = outboundWire.getServiceContract().getInterfaceClass();
if (CompositeComponent.class.equals(interfaze)) {
JavaServiceContract contract = new JavaServiceContract(CompositeComponent.class);
targetWire = new LoopBackWire();
targetWire.setServiceContract(contract);
targetWire.setContainer(parent);
outboundWire.setTargetWire(targetWire);
return;
}
if (outboundWire.getContainer().isSystem()) {
targetWire = parent.resolveSystemAutowire(interfaze);
} else {
targetWire = parent.resolveAutowire(interfaze);
}
} catch (TargetResolutionException e) {
String sourceReference = outboundWire.getReferenceName();
String sourceName = outboundWire.getContainer().getName();
throw new WireConnectException("Error resolving autowire target",
sourceName,
sourceReference,
null,
null,
e);
}
if (targetWire == null) {
// autowire may return null if it is optional. The client must decide if an error should be thrown
return;
}
Scope sourceScope = outboundWire.getContainer().getScope();
Scope targetScope = targetWire.getContainer().getScope();
boolean optimizable = isOptimizable(sourceScope, targetScope);
connect(outboundWire, targetWire, optimizable);
}
protected void checkIfWireable(OutboundWire sourceWire, InboundWire targetWire)
throws IncompatibleInterfacesException {
if (wireService == null) {
Class<?> sourceInterface = sourceWire.getServiceContract().getInterfaceClass();
Class<?> targetInterface = targetWire.getServiceContract().getInterfaceClass();
if (!sourceInterface.isAssignableFrom(targetInterface)) {
throw new IncompatibleInterfacesException(sourceWire, targetWire);
}
} else {
try {
ServiceContract sourceContract = sourceWire.getServiceContract();
ServiceContract targetContract = targetWire.getServiceContract();
wireService.checkCompatibility(sourceContract, targetContract, false);
} catch (IncompatibleServiceContractException e) {
throw new IncompatibleInterfacesException(sourceWire, targetWire, e);
}
}
}
protected boolean isOptimizable(Scope pReferrer, Scope pReferee) {
if (pReferrer == Scope.UNDEFINED
|| pReferee == Scope.UNDEFINED
|| pReferrer == Scope.CONVERSATION
|| pReferee == Scope.CONVERSATION) {
return false;
}
if (pReferee == pReferrer) {
return true;
} else if (pReferrer == Scope.STATELESS) {
return true;
} else if (pReferee == Scope.STATELESS) {
return false;
} else if (pReferrer == Scope.REQUEST && pReferee == Scope.SESSION) {
return true;
} else if (pReferrer == Scope.REQUEST && pReferee == Scope.COMPOSITE) {
return true;
} else if (pReferrer == Scope.REQUEST && pReferee == Scope.SYSTEM) {
return true;
} else if (pReferrer == Scope.SESSION && pReferee == Scope.COMPOSITE) {
return true;
} else if (pReferrer == Scope.SESSION && pReferee == Scope.SYSTEM) {
return true;
} else //noinspection SimplifiableIfStatement
if (pReferrer == Scope.SYSTEM && pReferee == Scope.COMPOSITE) {
// case where a service context points to a composite scoped component
return true;
} else {
return pReferrer == Scope.COMPOSITE && pReferee == Scope.SYSTEM;
}
}
/**
* Connects wires from a service to a target
*
* @param service the service
* @throws WiringException if an exception connecting the service wires is encountered
*/
private void handleService(Service service) throws WiringException {
CompositeComponent parent = service.getParent();
assert parent != null;
for (ServiceBinding binding : service.getServiceBindings()) {
InboundWire inboundWire = binding.getInboundWire();
OutboundWire outboundWire = binding.getOutboundWire();
// For a composite reference only, since its outbound wire comes from its parent composite,
// the corresponding target would not lie in its parent but rather in its parent's parent
SCAObject target;
if (service.isSystem()) {
target = parent.getSystemChild(outboundWire.getTargetName().getPartName());
} else {
target = parent.getChild(outboundWire.getTargetName().getPartName());
}
// connect the outbound service wire to the target
connect(binding, outboundWire, target);
// NB: this connect must be done after the outbound service chain is connected to its target above
connect(inboundWire, outboundWire, true);
}
}
private void handleReference(Reference reference) throws WiringException {
CompositeComponent parent = reference.getParent();
assert parent != null;
for (ReferenceBinding binding : reference.getReferenceBindings()) {
InboundWire inboundWire = binding.getInboundWire();
Map<Operation<?>, InboundInvocationChain> inboundChains = inboundWire.getInvocationChains();
for (InboundInvocationChain chain : inboundChains.values()) {
// add target invoker on inbound side
ServiceContract contract = inboundWire.getServiceContract();
Operation operation = chain.getOperation();
TargetInvoker invoker;
try {
invoker = binding.createTargetInvoker(contract, operation);
} catch (TargetInvokerCreationException e) {
String targetName = inboundWire.getContainer().getName();
throw new WireConnectException("Error processing inbound wire",
null,
null,
targetName,
null,
e);
}
chain.setTargetInvoker(invoker);
chain.prepare();
}
OutboundWire outboundWire = binding.getOutboundWire();
// connect the reference's inbound and outbound wires
connect(inboundWire, outboundWire, true);
}
}
private void handleComponent(Component component) throws WiringException {
CompositeComponent parent = component.getParent();
assert parent != null;
// connect outbound wires for component references to their targets
for (List<OutboundWire> referenceWires : component.getOutboundWires().values()) {
for (OutboundWire outboundWire : referenceWires) {
try {
if (component.isSystem()) {
if (outboundWire.isAutowire()) {
autowire(outboundWire, parent);
} else {
SCAObject target = parent.getSystemChild(outboundWire.getTargetName().getPartName());
connect(component, outboundWire, target);
}
} else {
if (outboundWire.isAutowire()) {
autowire(outboundWire, parent);
} else {
if (outboundWire.getTargetName() == null) {
String referenceName = outboundWire.getReferenceName();
throw new MissingWireTargetException("Target name was null", referenceName);
}
SCAObject target = parent.getChild(outboundWire.getTargetName().getPartName());
connect(component, outboundWire, target);
}
}
} catch (WiringException e) {
e.addContextName(component.getName());
e.addContextName(parent.getName());
throw e;
}
}
}
}
}
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