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package org.apache.camel.processor; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Message; |
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import org.apache.camel.Processor; |
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import org.apache.camel.model.ExceptionType; |
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import org.apache.camel.impl.ServiceSupport; |
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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 DeadLetterChannel extends ErrorHandlerSupport { |
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public static final String REDELIVERY_COUNTER = "org.apache.camel.RedeliveryCounter"; |
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public static final String REDELIVERED = "org.apache.camel.Redelivered"; |
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private static final transient Log LOG = LogFactory.getLog(DeadLetterChannel.class); |
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private Processor output; |
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private Processor deadLetter; |
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private RedeliveryPolicy redeliveryPolicy; |
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private Logger logger; |
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public DeadLetterChannel(Processor output, Processor deadLetter) { |
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this(output, deadLetter, new RedeliveryPolicy(), DeadLetterChannel.createDefaultLogger()); |
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} |
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public DeadLetterChannel(Processor output, Processor deadLetter, RedeliveryPolicy redeliveryPolicy, |
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Logger logger) { |
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this.deadLetter = deadLetter; |
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this.output = output; |
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this.redeliveryPolicy = redeliveryPolicy; |
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this.logger = logger; |
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} |
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public static <E extends Exchange> Logger createDefaultLogger() { |
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return new Logger(LOG, LoggingLevel.ERROR); |
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} |
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@Override |
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public String toString() { |
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return "DeadLetterChannel[" + output + ", " + deadLetter + ", " + redeliveryPolicy + "]"; |
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} |
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public void process(Exchange exchange) throws Exception { |
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int redeliveryCounter = 0; |
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long redeliveryDelay = 0; |
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RedeliveryPolicy currentRedeliveryPolicy = redeliveryPolicy; |
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Processor failureProcessor = deadLetter; |
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do { |
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if (redeliveryCounter > 0) { |
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redeliveryDelay = currentRedeliveryPolicy.getRedeliveryDelay(redeliveryDelay); |
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sleep(redeliveryDelay); |
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} |
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try { |
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output.process(exchange); |
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return; |
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} catch (Throwable e) { |
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logger.log("On delivery attempt: " + redeliveryCounter + " caught: " + e, e); |
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redeliveryCounter = incrementRedeliveryCounter(exchange, e); |
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ExceptionType exceptionPolicy = getExceptionPolicy(exchange, e); |
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if (exceptionPolicy != null) { |
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currentRedeliveryPolicy = exceptionPolicy.createRedeliveryPolicy(currentRedeliveryPolicy); |
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Processor processor = exceptionPolicy.getErrorHandler(); |
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if (processor != null) { |
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failureProcessor = processor; |
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} |
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} |
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} |
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} while (currentRedeliveryPolicy.shouldRedeliver(redeliveryCounter)); |
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failureProcessor.process(exchange); |
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} |
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public Processor getOutput() { |
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return output; |
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} |
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public Processor getDeadLetter() { |
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return deadLetter; |
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} |
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public RedeliveryPolicy getRedeliveryPolicy() { |
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return redeliveryPolicy; |
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} |
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public void setRedeliveryPolicy(RedeliveryPolicy redeliveryPolicy) { |
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this.redeliveryPolicy = redeliveryPolicy; |
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} |
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public Logger getLogger() { |
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return logger; |
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} |
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public void setLogger(Logger logger) { |
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this.logger = logger; |
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} |
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protected int incrementRedeliveryCounter(Exchange exchange, Throwable e) { |
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Message in = exchange.getIn(); |
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Integer counter = in.getHeader(REDELIVERY_COUNTER, Integer.class); |
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int next = 1; |
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if (counter != null) { |
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next = counter + 1; |
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} |
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in.setHeader(REDELIVERY_COUNTER, next); |
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in.setHeader(REDELIVERED, true); |
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exchange.setException(e); |
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return next; |
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} |
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protected void sleep(long redeliveryDelay) { |
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if (redeliveryDelay > 0) { |
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if (LOG.isDebugEnabled()) { |
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LOG.debug("Sleeping for: " + redeliveryDelay + " until attempting redelivery"); |
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} |
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try { |
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Thread.sleep(redeliveryDelay); |
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} catch (InterruptedException e) { |
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if (LOG.isDebugEnabled()) { |
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LOG.debug("Thread interupted: " + e, e); |
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} |
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} |
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} |
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} |
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protected void doStart() throws Exception { |
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ServiceHelper.startServices(output, deadLetter); |
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} |
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protected void doStop() throws Exception { |
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ServiceHelper.stopServices(deadLetter, output); |
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} |
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} |