Removed AbstractMessageHandler and DefaultMessageHandler.
This commit is contained in:
Mark Fisher
@@ -1,253 +0,0 @@
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/*
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* Copyright 2002-2008 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.handler;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.beans.factory.InitializingBean;
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import org.springframework.core.Ordered;
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import org.springframework.integration.ConfigurationException;
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import org.springframework.integration.handler.annotation.MethodArgumentMessageMapper;
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import org.springframework.integration.message.Message;
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import org.springframework.integration.message.MessageHandlingException;
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import org.springframework.integration.message.MessageMapper;
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import org.springframework.integration.util.DefaultMethodInvoker;
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import org.springframework.integration.util.MethodInvoker;
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import org.springframework.integration.util.NameResolvingMethodInvoker;
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import org.springframework.util.Assert;
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import org.springframework.util.ObjectUtils;
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import org.springframework.util.ReflectionUtils;
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import org.springframework.util.StringUtils;
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/**
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* A base class for any {@link MessageHandler} that may act as an adapter
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* by invoking a "plain" (not Message-aware) method for a given target object.
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* When used as an adapter, the target Object is mandatory and either a
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* {@link Method} reference or a 'methodName' must be provided. If no Object
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* and Method are provided, the handler will simply process the request
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* Message's payload.
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*
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* @author Mark Fisher
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*/
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public abstract class AbstractMessageHandler implements MessageHandler, Ordered, InitializingBean {
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protected static final Log logger = LogFactory.getLog(AbstractMessageHandler.class);
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private volatile boolean methodExpectsMessage;
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private volatile Object object;
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private volatile Method method;
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private volatile String methodName;
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private volatile MessageMapper<Object, Object[]> methodArgumentMapper;
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private volatile MethodInvoker invoker;
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private volatile int order = Ordered.LOWEST_PRECEDENCE;
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private volatile boolean initialized;
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private final Object initializationMonitor = new Object();
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public AbstractMessageHandler(Object object, Method method) {
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Assert.notNull(object, "object must not be null");
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this.object = object;
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this.setMethod(method);
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}
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public AbstractMessageHandler(Object object, String methodName) {
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Assert.notNull(object, "object must not be null");
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this.object = object;
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this.setMethodName(methodName);
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}
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public AbstractMessageHandler() {
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}
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public void setObject(Object object) {
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this.object = object;
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}
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public void setMethod(Method method) {
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Assert.notNull(method, "method must not be null");
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Class<?>[] parameterTypes = method.getParameterTypes();
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if (parameterTypes.length == 0) {
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throw new ConfigurationException("method must accept at least one parameter");
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}
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if (parameterTypes.length == 1 && Message.class.isAssignableFrom(parameterTypes[0])) {
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this.methodExpectsMessage = true;
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}
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this.method = method;
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this.methodName = method.getName();
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}
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public void setMethodName(String methodName) {
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Assert.notNull(methodName, "methodName must not be null");
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if (this.method != null && !this.method.getName().equals(methodName)) {
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this.method = null;
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}
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this.methodName = methodName;
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}
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public void setOrder(int order) {
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this.order = order;
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}
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public int getOrder() {
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return order;
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}
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public void afterPropertiesSet() {
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synchronized (this.initializationMonitor) {
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if (this.initialized) {
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return;
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}
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if (this.object != null) {
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if (this.method == null) {
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if (this.methodName == null) {
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throw new IllegalStateException("either the 'method' or 'methodName' must be provided when the 'object' property has been set");
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}
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final List<Method> candidates = new ArrayList<Method>();
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ReflectionUtils.doWithMethods(this.object.getClass(), new ReflectionUtils.MethodCallback() {
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public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
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if (method.getName().equals(AbstractMessageHandler.this.methodName)) {
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candidates.add(method);
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}
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}
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});
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if (candidates.size() == 0) {
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throw new ConfigurationException("no such method '" + this.methodName
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+ "' on target class [" + this.object.getClass() + "]");
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}
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if (candidates.size() == 1) {
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this.setMethod(candidates.get(0));
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}
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}
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if (this.method != null) {
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this.invoker = new DefaultMethodInvoker(this.object, this.method);
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this.methodArgumentMapper = new MethodArgumentMessageMapper(this.method);
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}
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else {
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// TODO: resolve the candidate method and/or create a dynamic resolver
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this.invoker = new NameResolvingMethodInvoker(this.object, this.methodName);
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}
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}
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this.initialized = true;
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}
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}
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public Message<?> handle(Message<?> requestMessage) {
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if (requestMessage == null || requestMessage.getPayload() == null) {
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if (logger.isDebugEnabled()) {
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logger.debug("message handler received a null message");
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}
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return null;
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}
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if (!this.initialized) {
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this.afterPropertiesSet();
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}
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Object result = (this.invoker != null) ?
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this.invokeHandlerMethod(requestMessage) : requestMessage.getPayload();
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if (result == null) {
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return null;
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}
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if (result instanceof Message) {
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return this.postProcessReplyMessage((Message<?>) result, requestMessage);
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}
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return this.createReplyMessage(result, requestMessage);
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}
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/**
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* Subclasses must implement this method to process a return value that
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* is already a Message instance.
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*
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* @param replyMessage the Message returned from an adapter method
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* @param requestMessage the original request Message
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* @return the Message to be sent to the reply MessageTarget
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*/
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protected abstract Message<?> postProcessReplyMessage(Message<?> replyMessage, Message<?> requestMessage);
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/**
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* Subclasses must implement this method to generate the reply Message when
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* the return value is not a Message instance.
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*
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* @param result the return value from an adapter method, or the Message payload if not acting as an adapter
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* @param requestMessage the original request Message
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* @return the Message to be sent to the reply MessageTarget
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*/
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protected abstract Message<?> createReplyMessage(Object result, Message<?> requestMessage);
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private Object invokeHandlerMethod(Message<?> message) {
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Object args[] = null;
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Object mappingResult = this.methodExpectsMessage ? message
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: this.mapMessageToMethodArguments(message);
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if (mappingResult != null && mappingResult.getClass().isArray()
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&& (Object.class.isAssignableFrom(mappingResult.getClass().getComponentType()))) {
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args = (Object[]) mappingResult;
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}
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else {
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args = new Object[] { mappingResult };
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}
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try {
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Object result = null;
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try {
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result = this.invoker.invokeMethod(args);
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}
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catch (NoSuchMethodException e) {
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try {
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result = this.invoker.invokeMethod(message);
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this.methodExpectsMessage = true;
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}
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catch (NoSuchMethodException e2) {
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throw new MessageHandlingException(message, "unable to resolve method for args: "
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+ StringUtils.arrayToCommaDelimitedString(args));
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}
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}
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if (result == null) {
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return null;
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}
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return result;
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}
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catch (InvocationTargetException e) {
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throw new MessageHandlingException(message, "Handler method '"
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+ this.methodName + "' threw an Exception.", e.getTargetException());
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}
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catch (Throwable e) {
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throw new MessageHandlingException(message, "Failed to invoke handler method '"
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+ this.methodName + "' with arguments: " + ObjectUtils.nullSafeToString(args), e);
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}
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}
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private Object[] mapMessageToMethodArguments(Message message) {
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if (this.methodArgumentMapper != null) {
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return this.methodArgumentMapper.mapMessage(message);
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}
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return new Object[] { message.getPayload() };
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}
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}
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@@ -1,48 +0,0 @@
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/*
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* Copyright 2002-2008 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.handler;
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import org.springframework.integration.message.Message;
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import org.springframework.integration.message.MessageBuilder;
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import org.springframework.integration.message.MessageHeaders;
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/**
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* The default MessageHandler implementation. Creates a Message for the reply payload.
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* The request Message's headers are copied and the request Message's ID is set as this
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* reply Message's correlationId.
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*
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* @author Mark Fisher
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*/
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public class DefaultMessageHandler extends AbstractMessageHandler {
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@Override
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protected Message<?> createReplyMessage(Object result, Message<?> requestMessage) {
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return this.prepareReplyMessage(MessageBuilder.fromPayload(result), requestMessage.getHeaders());
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}
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@Override
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protected Message<?> postProcessReplyMessage(Message<?> replyMessage, Message<?> requestMessage) {
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return this.prepareReplyMessage(MessageBuilder.fromMessage(replyMessage), requestMessage.getHeaders());
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}
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private Message<?> prepareReplyMessage(MessageBuilder<?> builder, MessageHeaders requestHeaders) {
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return builder.copyHeadersIfAbsent(requestHeaders)
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.setHeaderIfAbsent(MessageHeaders.CORRELATION_ID, requestHeaders.getId())
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.build();
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}
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}
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@@ -14,7 +14,7 @@
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* limitations under the License.
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*/
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package org.springframework.integration.handler;
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package org.springframework.integration.message;
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import static org.junit.Assert.assertEquals;
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@@ -28,159 +28,133 @@ import org.springframework.integration.annotation.Header;
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import org.springframework.integration.message.GenericMessage;
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import org.springframework.integration.message.Message;
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import org.springframework.integration.message.MessageBuilder;
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import org.springframework.integration.message.MessagingException;
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import org.springframework.integration.message.MessageMappingMethodInvoker;
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import org.springframework.integration.message.StringMessage;
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/**
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* @author Mark Fisher
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*/
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public class DefaultMessageHandlerTests {
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public class MessageMappingMethodInvokerTests {
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@Test
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public void payloadAsMethodParameterAndObjectAsReturnValue() {
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DefaultMessageHandler handler = new DefaultMessageHandler();
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handler.setObject(new TestHandler());
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handler.setMethodName("acceptPayloadAndReturnObject");
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handler.afterPropertiesSet();
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Message<?> result = handler.handle(new StringMessage("testing"));
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assertEquals("testing-1", result.getPayload());
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(
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new TestBean(), "acceptPayloadAndReturnObject");
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Object result = invoker.invokeMethod(new StringMessage("testing"));
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assertEquals("testing-1", result);
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}
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@Test
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public void payloadAsMethodParameterAndMessageAsReturnValue() {
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DefaultMessageHandler handler = new DefaultMessageHandler();
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handler.setObject(new TestHandler());
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handler.setMethodName("acceptPayloadAndReturnMessage");
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handler.afterPropertiesSet();
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Message<?> result = handler.handle(new StringMessage("testing"));
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(
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new TestBean(), "acceptPayloadAndReturnMessage");
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Message<?> result = (Message<?>) invoker.invokeMethod(new StringMessage("testing"));
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assertEquals("testing-2", result.getPayload());
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}
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@Test
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public void messageAsMethodParameterAndObjectAsReturnValue() {
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DefaultMessageHandler handler = new DefaultMessageHandler();
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handler.setObject(new TestHandler());
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handler.setMethodName("acceptMessageAndReturnObject");
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handler.afterPropertiesSet();
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Message<?> result = handler.handle(new StringMessage("testing"));
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assertEquals("testing-3", result.getPayload());
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(
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new TestBean(), "acceptMessageAndReturnObject");
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Object result = invoker.invokeMethod(new StringMessage("testing"));
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assertEquals("testing-3", result);
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}
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@Test
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public void messageAsMethodParameterAndMessageAsReturnValue() {
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DefaultMessageHandler handler = new DefaultMessageHandler();
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handler.setObject(new TestHandler());
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handler.setMethodName("acceptMessageAndReturnMessage");
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handler.afterPropertiesSet();
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Message<?> result = handler.handle(new StringMessage("testing"));
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(
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new TestBean(), "acceptMessageAndReturnMessage");
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Message<?> result = (Message<?>) invoker.invokeMethod(new StringMessage("testing"));
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assertEquals("testing-4", result.getPayload());
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}
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@Test
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public void messageSubclassAsMethodParameterAndMessageAsReturnValue() {
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DefaultMessageHandler handler = new DefaultMessageHandler();
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handler.setObject(new TestHandler());
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handler.setMethodName("acceptMessageSubclassAndReturnMessage");
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handler.afterPropertiesSet();
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Message<?> result = handler.handle(new StringMessage("testing"));
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(
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new TestBean(), "acceptMessageSubclassAndReturnMessage");
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Message<?> result = (Message<?>) invoker.invokeMethod(new StringMessage("testing"));
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assertEquals("testing-5", result.getPayload());
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}
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@Test
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public void messageSubclassAsMethodParameterAndMessageSubclassAsReturnValue() {
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DefaultMessageHandler handler = new DefaultMessageHandler();
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handler.setObject(new TestHandler());
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handler.setMethodName("acceptMessageSubclassAndReturnMessageSubclass");
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handler.afterPropertiesSet();
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Message<?> result = handler.handle(new StringMessage("testing"));
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(
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new TestBean(), "acceptMessageSubclassAndReturnMessageSubclass");
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Message<?> result = (Message<?>) invoker.invokeMethod(new StringMessage("testing"));
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assertEquals("testing-6", result.getPayload());
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}
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@Test
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public void payloadAndHeaderAnnotationMethodParametersAndObjectAsReturnValue() {
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DefaultMessageHandler handler = new DefaultMessageHandler();
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handler.setObject(new TestHandler());
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handler.setMethodName("acceptPayloadAndHeaderAndReturnObject");
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handler.afterPropertiesSet();
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(
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new TestBean(), "acceptPayloadAndHeaderAndReturnObject");
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Message<?> request = MessageBuilder.fromPayload("testing")
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.setHeader("number", new Integer(123)).build();
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Message<?> result = handler.handle(request);
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assertEquals("testing-123", result.getPayload());
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Object result = invoker.invokeMethod(request);
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assertEquals("testing-123", result);
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}
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@Test
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public void messageOnlyWithAnnotatedMethod() throws Exception {
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AnnotatedTestService handler = new AnnotatedTestService();
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Method method = handler.getClass().getMethod("messageOnly", Message.class);
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DefaultMessageHandler adapter = new DefaultMessageHandler();
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adapter.setObject(handler);
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adapter.setMethod(method);
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Message<?> result = adapter.handle(new StringMessage("foo"));
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assertEquals("foo", result.getPayload());
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AnnotatedTestService service = new AnnotatedTestService();
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Method method = service.getClass().getMethod("messageOnly", Message.class);
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(service, method);
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Object result = invoker.invokeMethod(new StringMessage("foo"));
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assertEquals("foo", result);
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}
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@Test
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public void payloadWithAnnotatedMethod() throws Exception {
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AnnotatedTestService handler = new AnnotatedTestService();
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Method method = handler.getClass().getMethod("integerMethod", Integer.class);
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DefaultMessageHandler adapter = new DefaultMessageHandler();
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adapter.setObject(handler);
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adapter.setMethod(method);
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Message<?> result = adapter.handle(new GenericMessage<Integer>(new Integer(123)));
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assertEquals(new Integer(123), result.getPayload());
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AnnotatedTestService service = new AnnotatedTestService();
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Method method = service.getClass().getMethod("integerMethod", Integer.class);
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(service, method);
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Object result = invoker.invokeMethod(new GenericMessage<Integer>(new Integer(123)));
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assertEquals(new Integer(123), result);
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}
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@Test
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public void convertedPayloadWithAnnotatedMethod() throws Exception {
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AnnotatedTestService handler = new AnnotatedTestService();
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Method method = handler.getClass().getMethod("integerMethod", Integer.class);
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DefaultMessageHandler adapter = new DefaultMessageHandler();
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adapter.setObject(handler);
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adapter.setMethod(method);
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Message<?> result = adapter.handle(new StringMessage("456"));
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assertEquals(new Integer(456), result.getPayload());
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AnnotatedTestService service = new AnnotatedTestService();
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Method method = service.getClass().getMethod("integerMethod", Integer.class);
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MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(service, method);
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Object result = invoker.invokeMethod(new StringMessage("456"));
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assertEquals(new Integer(456), result);
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}
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@Test(expected = MessagingException.class)
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@Test(expected = IllegalArgumentException.class)
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public void conversionFailureWithAnnotatedMethod() throws Exception {
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AnnotatedTestService handler = new AnnotatedTestService();
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Method method = handler.getClass().getMethod("integerMethod", Integer.class);
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DefaultMessageHandler adapter = new DefaultMessageHandler();
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adapter.setObject(handler);
|
||||
adapter.setMethod(method);
|
||||
Message<?> result = adapter.handle(new StringMessage("foo"));
|
||||
assertEquals(new Integer(123), result.getPayload());
|
||||
AnnotatedTestService service = new AnnotatedTestService();
|
||||
Method method = service.getClass().getMethod("integerMethod", Integer.class);
|
||||
MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(service, method);
|
||||
Object result = invoker.invokeMethod(new StringMessage("foo"));
|
||||
assertEquals(new Integer(123), result);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void messageAndHeaderWithAnnotatedMethod() throws Exception {
|
||||
AnnotatedTestService handler = new AnnotatedTestService();
|
||||
Method method = handler.getClass().getMethod("messageAndHeader", Message.class, Integer.class);
|
||||
DefaultMessageHandler adapter = new DefaultMessageHandler();
|
||||
adapter.setObject(handler);
|
||||
adapter.setMethod(method);
|
||||
AnnotatedTestService service = new AnnotatedTestService();
|
||||
Method method = service.getClass().getMethod("messageAndHeader", Message.class, Integer.class);
|
||||
MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(service, method);
|
||||
Message<String> message = MessageBuilder.fromPayload("foo")
|
||||
.setHeader("number", 42).build();
|
||||
Message<?> result = adapter.handle(message);
|
||||
assertEquals("foo-42", result.getPayload());
|
||||
Object result = invoker.invokeMethod(message);
|
||||
assertEquals("foo-42", result);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void multipleHeadersWithAnnotatedMethod() throws Exception {
|
||||
AnnotatedTestService handler = new AnnotatedTestService();
|
||||
Method method = handler.getClass().getMethod("twoHeaders", String.class, Integer.class);
|
||||
DefaultMessageHandler adapter = new DefaultMessageHandler();
|
||||
adapter.setObject(handler);
|
||||
adapter.setMethod(method);
|
||||
AnnotatedTestService service = new AnnotatedTestService();
|
||||
Method method = service.getClass().getMethod("twoHeaders", String.class, Integer.class);
|
||||
MessageMappingMethodInvoker invoker = new MessageMappingMethodInvoker(service, method);
|
||||
Message<String> message = MessageBuilder.fromPayload("foo")
|
||||
.setHeader("prop", "bar")
|
||||
.setHeader("number", 42).build();
|
||||
Message<?> result = adapter.handle(message);
|
||||
assertEquals("bar-42", result.getPayload());
|
||||
Object result = invoker.invokeMethod(message);
|
||||
assertEquals("bar-42", result);
|
||||
}
|
||||
|
||||
|
||||
private static class TestHandler {
|
||||
private static class TestBean {
|
||||
|
||||
public String acceptPayloadAndReturnObject(String s) {
|
||||
return s + "-1";
|
||||
Reference in New Issue
Block a user