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package org.apache.camel.processor.idempotent; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Expression; |
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import org.apache.camel.Processor; |
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import org.apache.camel.impl.ServiceSupport; |
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import org.apache.camel.util.ExpressionHelper; |
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import org.apache.camel.util.ServiceHelper; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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public class IdempotentConsumer extends ServiceSupport implements Processor { |
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private static final transient Log log = LogFactory.getLog(IdempotentConsumer.class); |
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private Expression<Exchange> messageIdExpression; |
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private Processor nextProcessor; |
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private MessageIdRepository messageIdRepository; |
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public IdempotentConsumer(Expression<Exchange> messageIdExpression, MessageIdRepository messageIdRepository, Processor nextProcessor) { |
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this.messageIdExpression = messageIdExpression; |
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this.messageIdRepository = messageIdRepository; |
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this.nextProcessor = nextProcessor; |
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} |
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@Override |
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public String toString() { |
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return "IdempotentConsumer[expression=" + messageIdExpression + ", repository=" + messageIdRepository + ", processor=" + nextProcessor + "]"; |
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} |
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public void process(Exchange exchange) throws Exception { |
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String messageId = ExpressionHelper.evaluateAsString(messageIdExpression, exchange); |
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if (messageId == null) { |
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throw new NoMessageIdException(exchange, messageIdExpression); |
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} |
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if (!messageIdRepository.contains(messageId)) { |
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nextProcessor.process(exchange); |
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} |
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else { |
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onDuplicateMessage(exchange, messageId); |
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} |
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} |
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public Expression<Exchange> getMessageIdExpression() { |
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return messageIdExpression; |
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} |
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public MessageIdRepository getMessageIdRepository() { |
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return messageIdRepository; |
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} |
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public Processor getNextProcessor() { |
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return nextProcessor; |
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} |
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protected void doStart() throws Exception { |
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ServiceHelper.startServices(nextProcessor); |
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} |
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protected void doStop() throws Exception { |
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ServiceHelper.stopServices(nextProcessor); |
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} |
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protected void onDuplicateMessage(Exchange exchange, String messageId) { |
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if (log.isDebugEnabled()) { |
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log.debug("Ignoring duplicate message with id: " + messageId + " for exchange: " + exchange); |
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} |
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} |
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} |