diff options
Diffstat (limited to 'sandbox/ant/sca/tags/2.0-M2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java')
| -rw-r--r-- | sandbox/ant/sca/tags/2.0-M2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/sandbox/ant/sca/tags/2.0-M2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java b/sandbox/ant/sca/tags/2.0-M2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java new file mode 100644 index 0000000000..1ff8d86f45 --- /dev/null +++ b/sandbox/ant/sca/tags/2.0-M2/modules/core-databinding/src/main/java/org/apache/tuscany/sca/core/databinding/wire/PassByValueInterceptor.java @@ -0,0 +1,268 @@ +/* + * 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.io.Serializable; +import java.lang.reflect.Array; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; +import java.net.URI; +import java.util.IdentityHashMap; +import java.util.List; +import java.util.Map; +import java.util.UUID; + +import javax.xml.namespace.QName; + +import org.apache.tuscany.sca.databinding.DataBinding; +import org.apache.tuscany.sca.databinding.DataBindingExtensionPoint; +import org.apache.tuscany.sca.databinding.javabeans.JavaBeansDataBinding; +import org.apache.tuscany.sca.databinding.jaxb.JAXBDataBinding; +import org.apache.tuscany.sca.interfacedef.DataType; +import org.apache.tuscany.sca.interfacedef.FaultExceptionMapper; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl; +import org.apache.tuscany.sca.interfacedef.util.XMLType; +import org.apache.tuscany.sca.invocation.Interceptor; +import org.apache.tuscany.sca.invocation.InvocationChain; +import org.apache.tuscany.sca.invocation.Invoker; +import org.apache.tuscany.sca.invocation.Message; +import org.oasisopen.sca.ServiceRuntimeException; + +/** + * Implementation of an interceptor that enforces pass-by-value semantics + * on operation invocations by copying the operation input and output data. + * + * @version $Rev$ $Date$ + */ +public class PassByValueInterceptor implements Interceptor { + + private DataBindingExtensionPoint dataBindings; + private FaultExceptionMapper faultExceptionMapper; + + private DataBinding[] inputDataBindings; + private DataBinding outputDataBinding; + private DataBinding javaBeanDataBinding; + private DataBinding jaxbDataBinding; + private Operation operation; + private Invoker nextInvoker; + private InvocationChain chain; + + /** + * Constructs a new PassByValueInterceptor. + * @param dataBindings databinding extension point + * @param operation the intercepted operation + */ + public PassByValueInterceptor(DataBindingExtensionPoint dataBindings, + FaultExceptionMapper faultExceptionMapper, + InvocationChain chain, + Operation operation) { + this.chain = chain; + this.operation = operation; + + // Cache data bindings to use + this.dataBindings = dataBindings; + this.faultExceptionMapper = faultExceptionMapper; + + jaxbDataBinding = dataBindings.getDataBinding(JAXBDataBinding.NAME); + javaBeanDataBinding = dataBindings.getDataBinding(JavaBeansDataBinding.NAME); + + // Determine the input databindings + if (operation.getInputType() != null) { + List<DataType> inputTypes = operation.getInputType().getLogical(); + inputDataBindings = new DataBinding[inputTypes.size()]; + int i = 0; + for (DataType inputType : inputTypes) { + String id = inputType.getDataBinding(); + inputDataBindings[i++] = dataBindings.getDataBinding(id); + } + } + + // Determine the output databinding + if (operation.getOutputType() != null) { + String id = operation.getOutputType().getDataBinding(); + outputDataBinding = dataBindings.getDataBinding(id); + } + } + + public Message invoke(Message msg) { + if (chain.allowsPassByReference()) { + return nextInvoker.invoke(msg); + } + + msg.setBody(copy((Object[])msg.getBody(), inputDataBindings, operation.getInputType().getLogical())); + + Message resultMsg = nextInvoker.invoke(msg); + + if (!msg.isFault() && operation.getOutputType() != null) { + resultMsg.setBody(copy(resultMsg.getBody(), outputDataBinding, operation.getOutputType())); + } + + if (msg.isFault()) { + msg.setFaultBody(copyFault(msg.getBody())); + } + return resultMsg; + } + + private Object copyFault(Object fault) { + if (faultExceptionMapper == null) { + return fault; + } + for (DataType et : operation.getFaultTypes()) { + if (et.getPhysical().isInstance(fault)) { + Throwable ex = (Throwable)fault; + DataType<DataType> exType = + new DataTypeImpl<DataType>(ex.getClass(), new DataTypeImpl<XMLType>(ex.getClass(), XMLType.UNKNOWN)); + faultExceptionMapper.introspectFaultDataType(exType, operation, false); + DataType faultType = exType.getLogical(); + Object faultInfo = faultExceptionMapper.getFaultInfo(ex, faultType.getPhysical(), operation); + faultInfo = copy(faultInfo, dataBindings.getDataBinding(faultType.getDataBinding()), faultType); + fault = faultExceptionMapper.wrapFaultInfo(exType, ex.getMessage(), faultInfo, ex.getCause(), operation); + return fault; + } + } + return fault; + } + + /** + * Copy an array of data objects passed to an operation + * @param data array of objects to copy + * @return the copy + */ + private Object[] copy(Object[] data, DataBinding[] dataBindings, List<DataType> dataTypes) { + if (data == null) { + return null; + } + Object[] copy = new Object[data.length]; + Map<Object, Object> map = new IdentityHashMap<Object, Object>(); + for (int i = 0; i < data.length; i++) { + Object arg = data[i]; + if (arg == null) { + copy[i] = null; + } else { + Object copiedArg = map.get(arg); + if (copiedArg != null) { + copy[i] = copiedArg; + } else { + copiedArg = copy(arg, dataBindings[i], dataTypes.get(i)); + map.put(arg, copiedArg); + copy[i] = copiedArg; + } + } + } + return copy; + } + + /** + * Copy data using the specified databinding. + * @param data input data + * @param dataBinding databinding to use + * @param dataType TODO + * @return a copy of the data + */ + private Object copy(Object data, DataBinding dataBinding, DataType dataType) { + if (data == null) { + return null; + } + Class<?> clazz = data.getClass(); + if (String.class == clazz || clazz.isPrimitive() + || Number.class.isAssignableFrom(clazz) + || Boolean.class.isAssignableFrom(clazz) + || Character.class.isAssignableFrom(clazz) + || Byte.class.isAssignableFrom(clazz) + || URI.class == clazz + || UUID.class == clazz + || QName.class == clazz) { + // Immutable classes + return data; + } + // If no databinding was specified, introspect the given arg to + // determine its databinding + if (dataBinding == null) { + dataType = dataBindings.introspectType(data, operation); + if (dataType != null) { + String db = dataType.getDataBinding(); + dataBinding = dataBindings.getDataBinding(db); + if (dataBinding == null && db != null) { + return data; + } + } + if (dataBinding == null) { + + // Default to the JavaBean databinding + dataBinding = javaBeanDataBinding; + } + } + + // Use the JAXB databinding to copy non-Serializable data + if (dataBinding == javaBeanDataBinding) { + + // If the input data is an array containing non Serializable elements + // use JAXB + clazz = data.getClass(); + if (clazz.isArray()) { + if (Array.getLength(data) != 0) { + Object element = Array.get(data, 0); + if (element != null && !(element instanceof Serializable)) { + dataBinding = jaxbDataBinding; + } + } + } else { + + // If the input data is not Serializable use JAXB + if (!(data instanceof Serializable)) { + dataBinding = jaxbDataBinding; + } + + if (data instanceof Cloneable) { + Method clone; + try { + clone = data.getClass().getMethod("clone", (Class[])null); + try { + return clone.invoke(data, (Object[])null); + } catch (InvocationTargetException e) { + if (e.getTargetException() instanceof CloneNotSupportedException) { + // Ignore + } else { + throw new ServiceRuntimeException(e); + } + } catch (Exception e) { + throw new ServiceRuntimeException(e); + } + } catch (NoSuchMethodException e) { + // Ignore it + } + } + } + } + + Object copy = dataBinding.copy(data, dataType, operation); + return copy; + } + + public Invoker getNext() { + return nextInvoker; + } + + public void setNext(Invoker next) { + this.nextInvoker = next; + } + +} |