Examples of org.apache.camel.spi.UnitOfWork

org.apache.camel.spi.UnitOfWork
An object representing the unit of work processing an {@link Exchange}which allows the use of {@link Synchronization} hooks. This object might map one-to-one witha transaction in JPA or Spring; or might not.

     */
    public static Expression routeIdExpression() {
        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                String answer = null;
                UnitOfWork uow = exchange.getUnitOfWork();
                RouteContext rc = uow != null ? uow.getRouteContext() : null;
                if (rc != null) {
                    answer = rc.getRoute().getId();
                }
                if (answer == null) {
                    // fallback and get from route id on the exchange

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        if (exhausted) {
            Processor target = null;
            boolean deliver = true;


            // the unit of work may have an optional callback associated we need to leverage
            UnitOfWork uow = exchange.getUnitOfWork();
            if (uow != null) {
                SubUnitOfWorkCallback uowCallback = uow.getSubUnitOfWorkCallback();
                if (uowCallback != null) {
                    // signal to the callback we are exhausted
                    uowCallback.onExhausted(exchange);
                    // do not deliver to the failure processor as its been handled by the callback instead
                    deliver = false;

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            data.retryWhilePredicate = exceptionPolicy.getRetryWhilePolicy();
            data.useOriginalInMessage = exceptionPolicy.isUseOriginalMessage();


            // route specific failure handler?
            Processor processor = null;
            UnitOfWork uow = exchange.getUnitOfWork();
            if (uow != null && uow.getRouteContext() != null) {
                String routeId = uow.getRouteContext().getRoute().getId();
                processor = exceptionPolicy.getErrorHandler(routeId);
            } else if (!exceptionPolicy.getErrorHandlers().isEmpty()) {
                // note this should really not happen, but we have this code as a fail safe
                // to be backwards compatible with the old behavior
                log.warn("Cannot determine current route from Exchange with id: {}, will fallback and use first error handler.", exchange.getExchangeId());

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            log.trace("Failure processor {} is processing Exchange: {}", processor, exchange);


            // store the last to endpoint as the failure endpoint
            exchange.setProperty(Exchange.FAILURE_ENDPOINT, exchange.getProperty(Exchange.TO_ENDPOINT));
            // and store the route id so we know in which route we failed
            UnitOfWork uow = exchange.getUnitOfWork();
            if (uow != null && uow.getRouteContext() != null) {
                exchange.setProperty(Exchange.FAILURE_ROUTE_ID, uow.getRouteContext().getRoute().getId());
            }


            // the failure processor could also be asynchronous
            AsyncProcessor afp = AsyncProcessorConverterHelper.convert(processor);
            sync = afp.process(exchange, new AsyncCallback() {

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            exchange.setProperty(Exchange.ERRORHANDLER_HANDLED, Boolean.FALSE);
            exchange.setException(exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class));
            // and put failure endpoint back as well
            exchange.setProperty(Exchange.FAILURE_ENDPOINT, exchange.getProperty(Exchange.TO_ENDPOINT));
            // and store the route id so we know in which route we failed
            UnitOfWork uow = exchange.getUnitOfWork();
            if (uow != null && uow.getRouteContext() != null) {
                exchange.setProperty(Exchange.FAILURE_ROUTE_ID, uow.getRouteContext().getRoute().getId());
            }
        }
    }

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     * @param processor    the processor wrapped in this unit of work processor
     * @param exchange     the exchange
     * @return the unit of work processor
     */
    protected UnitOfWorkProcessor createUnitOfWorkProcessor(RouteContext routeContext, Processor processor, Exchange exchange) {
        UnitOfWork parent = exchange.getProperty(Exchange.PARENT_UNIT_OF_WORK, UnitOfWork.class);
        if (parent != null) {
            return new ChildUnitOfWorkProcessor(parent, routeContext, processor);
        } else {
            return new UnitOfWorkProcessor(routeContext, processor);
        }

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            data.retryWhilePredicate = exceptionPolicy.getRetryWhilePolicy();
            data.useOriginalInMessage = exceptionPolicy.isUseOriginalMessage();


            // route specific failure handler?
            Processor processor = null;
            UnitOfWork uow = exchange.getUnitOfWork();
            if (uow != null && uow.getRouteContext() != null) {
                String routeId = uow.getRouteContext().getRoute().getId();
                processor = exceptionPolicy.getErrorHandler(routeId);
            } else if (!exceptionPolicy.getErrorHandlers().isEmpty()) {
                // note this should really not happen, but we have this code as a fail safe
                // to be backwards compatible with the old behavior
                log.warn("Cannot determine current route from Exchange with id: {}, will fallback and use first error handler.", exchange.getExchangeId());

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            exchange.setProperty(Exchange.ERRORHANDLER_HANDLED, Boolean.FALSE);
            exchange.setException(exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class));
            // and put failure endpoint back as well
            exchange.setProperty(Exchange.FAILURE_ENDPOINT, exchange.getProperty(Exchange.TO_ENDPOINT));
            // and store the route id so we know in which route we failed
            UnitOfWork uow = exchange.getUnitOfWork();
            if (uow != null && uow.getRouteContext() != null) {
                exchange.setProperty(Exchange.FAILURE_ROUTE_ID, uow.getRouteContext().getRoute().getId());
            }
        }
    }

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public class DefaultUnitOfWorkFactory implements UnitOfWorkFactory {


    @Override
    public UnitOfWork createUnitOfWork(Exchange exchange) {
        UnitOfWork answer;
        if (exchange.getContext().isUseMDCLogging()) {
            answer = new MDCUnitOfWork(exchange);
        } else {
            answer = new DefaultUnitOfWork(exchange);
        }

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    protected Processor createUnitOfWorkProcessor(RouteContext routeContext, Processor processor, Exchange exchange) {
        String routeId = routeContext != null ? routeContext.getRoute().idOrCreate(routeContext.getCamelContext().getNodeIdFactory()) : null;
        CamelInternalProcessor internal = new CamelInternalProcessor(processor);


        // and wrap it in a unit of work so the UoW is on the top, so the entire route will be in the same UoW
        UnitOfWork parent = exchange.getProperty(Exchange.PARENT_UNIT_OF_WORK, UnitOfWork.class);
        if (parent != null) {
            internal.addAdvice(new CamelInternalProcessor.ChildUnitOfWorkProcessorAdvice(routeId, parent));
        } else {
            internal.addAdvice(new CamelInternalProcessor.UnitOfWorkProcessorAdvice(routeId));
        }

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org.apache.camel.builder.ExpressionBuilder

org.apache.camel.converter.stream.CachedOutputStreamTest

org.apache.camel.impl.BridgeExceptionHandlerToErrorHandler

org.apache.camel.impl.DefaultConsumer

org.apache.camel.impl.DefaultExchange

org.apache.camel.impl.DefaultRuntimeEndpointRegistry

org.apache.camel.impl.DefaultUnitOfWork

org.apache.camel.impl.DefaultUnitOfWorkFactory

org.apache.camel.processor.CamelInternalProcessor

org.apache.camel.processor.CamelInternalProcessor$RouteContextAdvice

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