diff options
Diffstat (limited to 'sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaImplementationInvoker.java')
| -rw-r--r-- | sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaImplementationInvoker.java | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaImplementationInvoker.java b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaImplementationInvoker.java new file mode 100644 index 0000000000..9ea50fce73 --- /dev/null +++ b/sca-java-2.x/tags/2.0.1-RC1/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaImplementationInvoker.java @@ -0,0 +1,317 @@ +/* + * 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.security.AccessController; +import java.security.PrivilegedAction; +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.assembly.Service; +import org.apache.tuscany.sca.core.factory.ObjectCreationException; +import org.apache.tuscany.sca.core.invocation.Constants; +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.DataExchangeSemantics; +import org.apache.tuscany.sca.invocation.Invoker; +import org.apache.tuscany.sca.invocation.Message; +import org.apache.tuscany.sca.runtime.RuntimeComponent; +import org.apache.tuscany.sca.runtime.RuntimeComponentService; +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, DataExchangeSemantics { + protected Operation operation; + protected Method method; + protected RuntimeComponentService service; + protected boolean allowsPBR; + + @SuppressWarnings("unchecked") + protected final ScopeContainer scopeContainer; + private final InterfaceContract interfaze; + + public JavaImplementationInvoker(Operation operation, Method method, RuntimeComponent component, RuntimeComponentService service) { + 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.service = service; + this.interfaze = service.getInterfaceContract(); + } + + public JavaImplementationInvoker(Operation operation, RuntimeComponent component, RuntimeComponentService service) { + // used if the method can't be computed statically in advance + this.operation = operation; + this.scopeContainer = ((ScopedRuntimeComponent)component).getScopeContainer(); + this.service = service; + this.interfaze = service.getInterfaceContract(); + } + + @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 + 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; + } + + 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); + } + } + } + + } + + @Override + public boolean allowsPassByReference() { + return allowsPBR; + } + +} |