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package org.mule.construct; |
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|
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import org.apache.commons.lang.Validate; |
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import org.mule.MessageExchangePattern; |
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import org.mule.RequestContext; |
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import org.mule.api.ExceptionPayload; |
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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.MuleRuntimeException; |
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import org.mule.api.construct.FlowConstructInvalidException; |
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import org.mule.api.endpoint.InboundEndpoint; |
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import org.mule.api.endpoint.OutboundEndpoint; |
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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.routing.filter.Filter; |
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import org.mule.api.source.MessageSource; |
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import org.mule.config.i18n.MessageFactory; |
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import org.mule.construct.processor.FlowConstructStatisticsMessageObserver; |
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import org.mule.expression.ExpressionConfig; |
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import org.mule.expression.transformers.ExpressionArgument; |
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import org.mule.expression.transformers.ExpressionTransformer; |
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import org.mule.interceptor.LoggingInterceptor; |
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import org.mule.message.DefaultExceptionPayload; |
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import org.mule.processor.AbstractInterceptingMessageProcessor; |
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import org.mule.processor.ResponseMessageProcessorAdapter; |
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import org.mule.processor.builder.InterceptingChainMessageProcessorBuilder; |
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import org.mule.routing.ChoiceRouter; |
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import org.mule.util.StringUtils; |
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|
42 | 0 | public class Validator extends AbstractFlowConstruct |
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{ |
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private final OutboundEndpoint outboundEndpoint; |
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private final Filter validationFilter; |
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private final String ackExpression; |
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private final String nackExpression; |
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private final String errorExpression; |
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|
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public Validator(String name, |
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MuleContext muleContext, |
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MessageSource messageSource, |
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OutboundEndpoint outboundEndpoint, |
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Filter validationFilter, |
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String ackExpression, |
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String nackExpression) |
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{ |
58 | 0 | this(name, muleContext, messageSource, outboundEndpoint, validationFilter, ackExpression, |
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nackExpression, null); |
60 | 0 | } |
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|
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public Validator(String name, |
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MuleContext muleContext, |
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MessageSource messageSource, |
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OutboundEndpoint outboundEndpoint, |
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Filter validationFilter, |
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String ackExpression, |
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String nackExpression, |
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String errorExpression) |
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{ |
71 | 0 | super(name, muleContext); |
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|
73 | 0 | Validate.notNull(messageSource, "messageSource can't be null"); |
74 | 0 | Validate.notNull(outboundEndpoint, "outboundEndpoint can't be null"); |
75 | 0 | Validate.notNull(validationFilter, "validationFilter can't be null"); |
76 | 0 | Validate.notEmpty(ackExpression, "ackExpression can't be empty"); |
77 | 0 | Validate.notEmpty(nackExpression, "nackExpression can't be empty"); |
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|
79 | 0 | this.messageSource = messageSource; |
80 | 0 | this.outboundEndpoint = outboundEndpoint; |
81 | 0 | this.validationFilter = validationFilter; |
82 | 0 | this.ackExpression = ackExpression; |
83 | 0 | this.nackExpression = nackExpression; |
84 | 0 | this.errorExpression = errorExpression; |
85 | 0 | } |
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|
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@Override |
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protected void configureMessageProcessors(InterceptingChainMessageProcessorBuilder builder) |
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{ |
90 | 0 | builder.chain(new LoggingInterceptor()); |
91 | 0 | builder.chain(new FlowConstructStatisticsMessageObserver()); |
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|
93 | 0 | final ErrorAwareEventReturningMessageProcessor outboundMessageProcessor = new ErrorAwareEventReturningMessageProcessor(); |
94 | 0 | outboundMessageProcessor.setListener(outboundEndpoint); |
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|
96 | 0 | final ResponseMessageProcessorAdapter ackResponseMessageProcessor = new ResponseMessageProcessorAdapter(); |
97 | 0 | ackResponseMessageProcessor.setListener(outboundMessageProcessor); |
98 | 0 | ackResponseMessageProcessor.setProcessor(getExpressionTransformer(getName() + "-ack-expression", |
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ackExpression)); |
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|
101 | 0 | MessageProcessor validRouteMessageProcessor = ackResponseMessageProcessor; |
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|
103 | 0 | if (hasErrorExpression()) |
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{ |
105 | 0 | final ErrorExpressionTransformerMessageProcessor errorResponseMessageProcessor = new ErrorExpressionTransformerMessageProcessor( |
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getExpressionTransformer(getName() + "-error-expression", errorExpression)); |
107 | 0 | errorResponseMessageProcessor.setListener(ackResponseMessageProcessor); |
108 | 0 | validRouteMessageProcessor = errorResponseMessageProcessor; |
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} |
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|
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|
112 | 0 | final ChoiceRouter choiceRouter = new ChoiceRouter(); |
113 | 0 | choiceRouter.addRoute(validRouteMessageProcessor, validationFilter); |
114 | 0 | choiceRouter.setDefaultRoute(getExpressionTransformer(getName() + "-nack-expression", nackExpression)); |
115 | 0 | builder.chain(choiceRouter); |
116 | 0 | } |
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|
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@Override |
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protected void validateConstruct() throws FlowConstructInvalidException |
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{ |
121 | 0 | super.validateConstruct(); |
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|
123 | 0 | validateMessageSource(); |
124 | 0 | validateOutboundEndpoint(); |
125 | 0 | validateExpression(ackExpression); |
126 | 0 | validateExpression(nackExpression); |
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|
128 | 0 | if (hasErrorExpression()) |
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{ |
130 | 0 | validateExpression(errorExpression); |
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} |
132 | 0 | } |
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|
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private void validateMessageSource() throws FlowConstructInvalidException |
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{ |
136 | 0 | if ((messageSource instanceof InboundEndpoint) |
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&& (!((InboundEndpoint) messageSource).getExchangePattern().equals( |
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MessageExchangePattern.REQUEST_RESPONSE))) |
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{ |
140 | 0 | throw new FlowConstructInvalidException( |
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MessageFactory.createStaticMessage("Validator only works with a request-response inbound endpoint."), |
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this); |
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} |
144 | 0 | } |
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|
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private void validateOutboundEndpoint() throws FlowConstructInvalidException |
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{ |
148 | 0 | if ((hasErrorExpression()) |
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&& (!outboundEndpoint.getExchangePattern().equals(MessageExchangePattern.REQUEST_RESPONSE))) |
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{ |
151 | 0 | throw new FlowConstructInvalidException( |
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MessageFactory.createStaticMessage("Validator with an error expression only works with a request-response outbound endpoint."), |
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this); |
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} |
155 | 0 | } |
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|
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protected boolean hasErrorExpression() |
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{ |
159 | 0 | return StringUtils.isNotBlank(errorExpression); |
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} |
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|
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private void validateExpression(String expression) throws FlowConstructInvalidException |
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{ |
164 | 0 | if (!muleContext.getExpressionManager().isExpression(expression)) |
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{ |
166 | 0 | throw new FlowConstructInvalidException( |
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MessageFactory.createStaticMessage("Invalid expression in Validator: " + expression), this); |
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} |
169 | 0 | } |
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|
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private ExpressionTransformer getExpressionTransformer(String name, String expression) |
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{ |
173 | 0 | final ExpressionConfig expressionConfig = new ExpressionConfig(); |
174 | 0 | expressionConfig.parse(expression); |
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|
176 | 0 | final ExpressionArgument expressionArgument = new ExpressionArgument(name, expressionConfig, false); |
177 | 0 | expressionArgument.setMuleContext(muleContext); |
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|
179 | 0 | final ExpressionTransformer expressionTransformer = new ExpressionTransformer(); |
180 | 0 | expressionTransformer.setMuleContext(muleContext); |
181 | 0 | expressionTransformer.addArgument(expressionArgument); |
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|
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try |
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{ |
185 | 0 | expressionTransformer.initialise(); |
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} |
187 | 0 | catch (final InitialisationException ie) |
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{ |
189 | 0 | throw new MuleRuntimeException(ie); |
190 | 0 | } |
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|
192 | 0 | return expressionTransformer; |
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} |
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|
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private static class ErrorExpressionTransformerMessageProcessor extends |
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AbstractInterceptingMessageProcessor |
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{ |
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private final ExpressionTransformer errorExpressionTransformer; |
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|
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public ErrorExpressionTransformerMessageProcessor(ExpressionTransformer errorExpressionTransformer) |
201 | 0 | { |
202 | 0 | this.errorExpressionTransformer = errorExpressionTransformer; |
203 | 0 | } |
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|
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public MuleEvent process(MuleEvent event) throws MuleException |
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{ |
207 | 0 | final MuleEvent nextResult = super.processNext(event); |
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|
209 | 0 | final ExceptionPayload nextResultMessageExceptionPayload = getExceptionPayload(nextResult); |
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|
211 | 0 | if (nextResultMessageExceptionPayload != null) |
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{ |
213 | 0 | return errorExpressionTransformer.process(event); |
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} |
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|
216 | 0 | return nextResult; |
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} |
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} |
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|
220 | 0 | private static class ErrorAwareEventReturningMessageProcessor extends |
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AbstractInterceptingMessageProcessor |
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{ |
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|
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|
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|
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|
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|
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public MuleEvent process(MuleEvent event) throws MuleException |
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{ |
230 | 0 | final MuleEvent result = RequestContext.cloneAndUpdateEventEndpoint(event, this); |
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|
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try |
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{ |
234 | 0 | final MuleEvent nextResult = super.processNext(event); |
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|
236 | 0 | final ExceptionPayload nextResultMessageExceptionPayload = getExceptionPayload(nextResult); |
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|
238 | 0 | if (nextResultMessageExceptionPayload != null) |
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{ |
240 | 0 | result.getMessage().setExceptionPayload(nextResultMessageExceptionPayload); |
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} |
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} |
243 | 0 | catch (final MuleException me) |
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{ |
245 | 0 | logger.error(me); |
246 | 0 | result.getMessage().setExceptionPayload(new DefaultExceptionPayload(me)); |
247 | 0 | } |
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|
249 | 0 | return result; |
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} |
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} |
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|
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private static ExceptionPayload getExceptionPayload(MuleEvent event) |
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{ |
255 | 0 | if (event == null) |
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{ |
257 | 0 | return null; |
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} |
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|
260 | 0 | final MuleMessage message = event.getMessage(); |
261 | 0 | if (message == null) |
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{ |
263 | 0 | return null; |
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} |
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|
266 | 0 | return message.getExceptionPayload(); |
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} |
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} |