Question

我尝试使用resequencer流处理Camel路由中的Exception 我使用Camel 2.15.2
有时交换不会与我的deadLetterChannel一起路由，并且在日志中是NullPointerException 似乎交换的UnitOfWork有时会丢失我可以用这个类重现它：

音序器（处理器）：

public class Sequencer implements Processor {
    private int sequence = -1;

    @Override
    public void process(Exchange exchange) throws Exception {
        exchange.setProperty(PropertyFields.SEQUENCE_NUMBER, getNextSequenceNumber());
    }

    private synchronized int getNextSequenceNumber() {
        sequence++;
        if (sequence >= Integer.MAX_VALUE) {
            sequence = 0;
        }
        return sequence;
    }

}

处理器抛出异常：

public class ProzessorErrorThrower implements Processor {

    @Override
    public void process(Exchange exchange) throws Exception {
        try {
            UnitOfWork unit = exchange.getUnitOfWork();
            System.out.println("UNIT: " + unit + " | " + exchange.getIn().getBody());
        } catch(Exception e) {
            e.printStackTrace();
        }
        exchange.setException(new Exception("Exception: " + exchange.getIn().getBody()));
    }

}

处理异常的处理器：

public class ProzessorErrorHandler implements Processor {

    @Override
    public void process(Exchange exchange) throws Exception {
        Object o = exchange.getProperty(Exchange.EXCEPTION_CAUGHT);
        if (o != null) {
            if (o instanceof Exception) {
                Exception e = (Exception)o;
                System.out.println("Error Handler " + exchange.getIn().getBody() + " " + e.getMessage());
            } else {
                System.out.println("ERROR");
            }
        } else {
            System.out.println("ERROR");
        }
    }

}

我的方法路线和发送消息到路线：

CamelContext context = new DefaultCamelContext();

RouteBuilder builder = new RouteBuilder() {

    @Override
    public void configure() throws Exception {
        errorHandler(deadLetterChannel("direct:deadLetter"));

        from("direct:deadLetter").process(new ProzessorErrorHandler());

        StreamResequencerConfig configStream = new StreamResequencerConfig(100, 3000L);

        from("direct:resequencer").
            resequence(exchangeProperty(PropertyFields.SEQUENCE_NUMBER)).
                stream(configStream).
            process(new ProzessorErrorThrower());
        from("direct:start").process(new Sequencer()).to("direct:resequencer");
    }
};

context.addRoutes(builder);

ProducerTemplate template = context.createProducerTemplate();

context.start();

try {
    template.sendBody("direct:start", "Test 01");
    template.sendBody("direct:start", "Test 02");
    template.sendBody("direct:start", "Test 03");

    Thread.sleep(5000);
    System.out.println();
    System.out.println();

    template.sendBody("direct:start", "Test 04");
    template.sendBody("direct:start", "Test 05");
    template.sendBody("direct:start", "Test 06");

Thread.sleep(2000);
} catch (Exception e) {
    e.printStackTrace();
} finally {
    context.stop();
}

我得到以下输出：

UNIT: DefaultUnitOfWork | Test 01
Error Handler Test 01 Exception: Test 01
UNIT: DefaultUnitOfWork | Test 02
Error Handler Test 02 Exception: Test 02
UNIT: DefaultUnitOfWork | Test 03
Error Handler Test 03 Exception: Test 03


UNIT: null | Test 04
UNIT: DefaultUnitOfWork | Test 05
Error Handler Test 05 Exception: Test 05
UNIT: DefaultUnitOfWork | Test 06
Error Handler Test 06 Exception: Test 06

在日志中：

WARN - 11.08.2015 09:52:17.247 [Caused by: [java.lang.NullPointerException - null]] -> camel.processor.StreamResequencer
java.lang.NullPointerException
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:372)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:109)
    at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:87)
    at org.apache.camel.processor.StreamResequencer.sendElement(StreamResequencer.java:192)
    at org.apache.camel.processor.StreamResequencer.sendElement(StreamResequencer.java:68)
    at org.apache.camel.processor.resequencer.ResequencerEngine.deliverNext(ResequencerEngine.java:280)
    at org.apache.camel.processor.resequencer.ResequencerEngine.deliver(ResequencerEngine.java:244)
    at org.apache.camel.processor.StreamResequencer$Delivery.run(StreamResequencer.java:262)

如果我修改了我的代码并设置了一个新的工作单元，如果它是null，则在另一条消息上出现相同的错误，但没有输出它是null。

日志中的第一个条目指向访问工作单元的骆驼代码行（RedeliveryErrorHandler.java:372）

我还没有找到与此相关的东西。

有人可以帮助我吗？

使用重定序器流

0 个答案: