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package org.mule.processor; |
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import org.mule.DefaultMuleEvent; |
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import org.mule.DefaultMuleMessage; |
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import org.mule.api.MessagingException; |
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import org.mule.api.MuleContext; |
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import org.mule.api.MuleEvent; |
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import org.mule.api.MuleException; |
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import org.mule.api.MuleMessage; |
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import org.mule.api.context.MuleContextAware; |
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import org.mule.api.expression.ExpressionManager; |
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import org.mule.api.lifecycle.Initialisable; |
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import org.mule.api.lifecycle.InitialisationException; |
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import org.mule.api.processor.MessageProcessor; |
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import org.mule.api.registry.RegistrationException; |
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import org.mule.api.transformer.DataType; |
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import org.mule.api.transformer.Transformer; |
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import org.mule.api.transformer.TransformerException; |
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import org.mule.config.i18n.CoreMessages; |
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import org.mule.transformer.TransformerTemplate; |
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import org.mule.transformer.types.DataTypeFactory; |
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import org.mule.transport.NullPayload; |
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import org.mule.util.ClassUtils; |
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import org.mule.util.TemplateParser; |
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import org.mule.util.TemplateParser.PatternInfo; |
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import java.lang.reflect.Method; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.Map.Entry; |
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|
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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|
55 | 0 | public class InvokerMessageProcessor implements MessageProcessor, Initialisable, MuleContextAware |
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{ |
57 | 0 | protected final transient Log logger = LogFactory.getLog(getClass()); |
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|
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protected Object object; |
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protected Class<?> objectType; |
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protected String methodName; |
62 | 0 | protected List<?> arguments = new ArrayList<Object>();; |
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protected Class<?>[] argumentTypes; |
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protected String name; |
65 | 0 | protected PatternInfo patternInfo = TemplateParser.createMuleStyleParser().getStyle(); |
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|
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protected Method method; |
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protected ExpressionManager expressionManager; |
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protected MuleContext muleContext; |
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|
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public void initialise() throws InitialisationException |
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{ |
73 | 0 | if (object == null) |
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{ |
75 | 0 | lookupObjectInstance(); |
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} |
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|
78 | 0 | resolveMethodToInvoke(); |
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|
80 | 0 | expressionManager = muleContext.getExpressionManager(); |
81 | 0 | } |
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|
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protected void resolveMethodToInvoke() throws InitialisationException |
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{ |
85 | 0 | if (argumentTypes != null) |
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{ |
87 | 0 | method = ClassUtils.getMethod(object.getClass(), methodName, argumentTypes); |
88 | 0 | if (method == null) |
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{ |
90 | 0 | throw new InitialisationException(CoreMessages.methodWithParamsNotFoundOnObject(methodName, |
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argumentTypes, object.getClass()), this); |
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} |
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} |
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else |
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{ |
96 | 0 | List<Method> matchingMethods = new ArrayList<Method>(); |
97 | 0 | int argSize = arguments != null ? arguments.size() : 0; |
98 | 0 | for (Method methodCandidate : object.getClass().getMethods()) |
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{ |
100 | 0 | if (methodCandidate.getName().equals(methodName) |
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&& methodCandidate.getParameterTypes().length == argSize) |
102 | 0 | matchingMethods.add(methodCandidate); |
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} |
104 | 0 | if (matchingMethods.size() == 1) |
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{ |
106 | 0 | method = matchingMethods.get(0); |
107 | 0 | argumentTypes = method.getParameterTypes(); |
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} |
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else |
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{ |
111 | 0 | throw new InitialisationException(CoreMessages.methodWithNumParamsNotFoundOnObject( |
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methodName, arguments.size(), object), this); |
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} |
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} |
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|
116 | 0 | if (logger.isDebugEnabled()) |
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{ |
118 | 0 | logger.debug(String.format("Initialised %s to use method: '%s'", this, method)); |
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} |
120 | 0 | } |
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|
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protected void lookupObjectInstance() throws InitialisationException |
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{ |
124 | 0 | if (logger.isDebugEnabled()) |
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{ |
126 | 0 | logger.debug(String.format( |
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"No object instance speciedied. Looking up single instance of type %s in mule registry", |
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objectType)); |
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} |
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|
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try |
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{ |
133 | 0 | object = muleContext.getRegistry().lookupObject(objectType); |
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} |
135 | 0 | catch (RegistrationException e) |
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{ |
137 | 0 | throw new InitialisationException( |
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CoreMessages.initialisationFailure(String.format( |
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"Muliple instances of '%s' were found in the registry so you need to configure a specific instance", |
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objectType)), this); |
141 | 0 | } |
142 | 0 | if (object == null) |
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{ |
144 | 0 | throw new InitialisationException(CoreMessages.initialisationFailure(String.format( |
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"No instance of '%s' was found in the registry", objectType)), this); |
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|
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} |
148 | 0 | } |
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|
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public MuleEvent process(MuleEvent event) throws MuleException |
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{ |
152 | 0 | MuleEvent resultEvent = event; |
153 | 0 | Object[] args = evaluateArguments(event, arguments); |
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|
155 | 0 | if (logger.isDebugEnabled()) |
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{ |
157 | 0 | logger.debug(String.format("Invoking '%s' of '%s' with arguments: '%s'", method.getName(), |
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object, args)); |
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} |
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|
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try |
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{ |
163 | 0 | Object result = method.invoke(object, args); |
164 | 0 | if (!method.getReturnType().equals(void.class)) |
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{ |
166 | 0 | resultEvent = createResultEvent(event, result); |
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} |
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} |
169 | 0 | catch (Exception e) |
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{ |
171 | 0 | throw new MessagingException(CoreMessages.failedToInvoke(object.toString()), event, e); |
172 | 0 | } |
173 | 0 | return resultEvent; |
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} |
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|
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protected Object[] evaluateArguments(MuleEvent event, List<?> argumentTemplates) |
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throws MessagingException |
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{ |
179 | 0 | int argSize = argumentTemplates != null ? argumentTemplates.size() : 0; |
180 | 0 | Object[] args = new Object[argSize]; |
181 | 0 | MuleMessage message = event.getMessage(); |
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try |
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{ |
184 | 0 | for (int i = 0; i < args.length; i++) |
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{ |
186 | 0 | Object argumentTemplate = argumentTemplates.get(i); |
187 | 0 | if (argumentTemplate != null) |
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{ |
189 | 0 | args[i] = transformArgument(evaluateExpressionCandidate(argumentTemplate, message), |
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argumentTypes[i]); |
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} |
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} |
193 | 0 | return args; |
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} |
195 | 0 | catch (TransformerException e) |
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{ |
197 | 0 | throw new MessagingException(event, e); |
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} |
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} |
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@SuppressWarnings("unchecked") |
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protected Object evaluateExpressionCandidate(Object expressionCandidate, MuleMessage message) |
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throws TransformerException |
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{ |
205 | 0 | if (expressionCandidate instanceof Collection<?>) |
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{ |
207 | 0 | Collection<Object> collectionTemplate = (Collection<Object>) expressionCandidate; |
208 | 0 | Collection<Object> newCollection = new ArrayList<Object>(); |
209 | 0 | for (Object object : collectionTemplate) |
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{ |
211 | 0 | newCollection.add(evaluateExpressionCandidate(object, message)); |
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} |
213 | 0 | return newCollection; |
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} |
215 | 0 | else if (expressionCandidate instanceof Map<?, ?>) |
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{ |
217 | 0 | Map<Object, Object> mapTemplate = (Map<Object, Object>) expressionCandidate; |
218 | 0 | Map<Object, Object> newMap = new HashMap<Object, Object>(); |
219 | 0 | for (Entry<Object, Object> entry : mapTemplate.entrySet()) |
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{ |
221 | 0 | newMap.put(evaluateExpressionCandidate(entry.getKey(), message), evaluateExpressionCandidate( |
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entry.getValue(), message)); |
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} |
224 | 0 | return newMap; |
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} |
226 | 0 | else if (expressionCandidate instanceof String[]) |
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{ |
228 | 0 | String[] stringArrayTemplate = (String[]) expressionCandidate; |
229 | 0 | Object[] newArray = new String[stringArrayTemplate.length]; |
230 | 0 | for (int j = 0; j < stringArrayTemplate.length; j++) |
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{ |
232 | 0 | newArray[j] = evaluateExpressionCandidate(stringArrayTemplate[j], message); |
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} |
234 | 0 | return newArray; |
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} |
236 | 0 | if (expressionCandidate instanceof String) |
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{ |
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Object arg; |
239 | 0 | String expression = (String) expressionCandidate; |
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|
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|
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|
243 | 0 | if (expression.startsWith(patternInfo.getPrefix()) |
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&& expression.endsWith(patternInfo.getSuffix())) |
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{ |
246 | 0 | arg = expressionManager.evaluate(expression, message); |
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} |
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else |
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{ |
250 | 0 | arg = expressionManager.parse(expression, message); |
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} |
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|
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|
254 | 0 | if (arg instanceof MuleMessage) |
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{ |
256 | 0 | arg = ((MuleMessage) arg).getPayload(); |
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} |
258 | 0 | return arg; |
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} |
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else |
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{ |
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|
263 | 0 | return expressionCandidate; |
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} |
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} |
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|
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private Object transformArgument(Object arg, Class<?> type) throws TransformerException |
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{ |
269 | 0 | if (!(type.isAssignableFrom(arg.getClass()))) |
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{ |
271 | 0 | DataType<?> source = DataTypeFactory.create(arg.getClass()); |
272 | 0 | DataType<?> target = DataTypeFactory.create(type); |
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|
274 | 0 | Transformer t = muleContext.getRegistry().lookupTransformer(source, target); |
275 | 0 | arg = t.transform(arg); |
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} |
277 | 0 | return arg; |
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} |
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|
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public void setObject(Object object) |
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{ |
282 | 0 | this.object = object; |
283 | 0 | } |
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|
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public void setMethodName(String methodName) |
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{ |
287 | 0 | this.methodName = methodName; |
288 | 0 | } |
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|
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public void setArgumentExpressionsString(String arguments) |
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{ |
292 | 0 | this.arguments = Arrays.asList(arguments.split("\\s*,\\s*")); |
293 | 0 | } |
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|
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public void setArguments(List<?> arguments) |
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{ |
297 | 0 | this.arguments = arguments; |
298 | 0 | } |
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|
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protected MuleEvent createResultEvent(MuleEvent event, Object result) throws MuleException |
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{ |
302 | 0 | if (result instanceof MuleMessage) |
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{ |
304 | 0 | return new DefaultMuleEvent((MuleMessage) result, event); |
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} |
306 | 0 | else if (result != null) |
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{ |
308 | 0 | event.getMessage().applyTransformers( |
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event, |
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Collections.<Transformer> singletonList(new TransformerTemplate( |
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new TransformerTemplate.OverwitePayloadCallback(result)))); |
312 | 0 | return event; |
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} |
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else |
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{ |
316 | 0 | return new DefaultMuleEvent(new DefaultMuleMessage(NullPayload.getInstance(), |
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event.getMuleContext()), event); |
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} |
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} |
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|
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public String getName() |
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{ |
323 | 0 | return name; |
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} |
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|
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public void setName(String name) |
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{ |
328 | 0 | this.name = name; |
329 | 0 | } |
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|
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public void setArgumentTypes(Class<?>[] argumentTypes) |
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{ |
333 | 0 | this.argumentTypes = argumentTypes; |
334 | 0 | } |
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|
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@Override |
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public String toString() |
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{ |
339 | 0 | return String.format( |
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"InvokerMessageProcessor [name=%s, object=%s, methodName=%s, argExpressions=%s, argTypes=%s]", |
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name, object, methodName, arguments, argumentTypes); |
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} |
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|
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public void setMuleContext(MuleContext context) |
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{ |
346 | 0 | this.muleContext = context; |
347 | 0 | } |
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|
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public void setObjectType(Class<?> objectType) |
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{ |
351 | 0 | this.objectType = objectType; |
352 | 0 | } |
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|
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} |