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.

    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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    }


    // Implementation methods
    //-------------------------------------------------------------------------
    protected Object getBreadCrumbID(Exchange exchange) {
        UnitOfWork unitOfWork = exchange.getUnitOfWork();
        return unitOfWork.getId();
    }

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        }


        if (exchange.getUnitOfWork() == null) {
            // If there is no existing UoW, then we should start one and
            // terminate it once processing is completed for the exchange.
            final UnitOfWork uow = createUnitOfWork(exchange);
            exchange.setUnitOfWork(uow);
            try {
                uow.start();
            } catch (Exception e) {
                callback.done(true);
                exchange.setException(e);
                return true;
            }

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     *
     * @param exchange the exchange
     * @return the created unit of work
     */
    protected UnitOfWork createUnitOfWork(Exchange exchange) {
        UnitOfWork answer;
        if (exchange.getContext().isUseMDCLogging()) {
            answer = new MDCUnitOfWork(exchange);
        } else {
            answer = new DefaultUnitOfWork(exchange);
        }

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        this.parent = parentUnitOfWork;
    }


    public UnitOfWork createChildUnitOfWork(Exchange childExchange) {
        // create a new child unit of work, and mark me as its parent
        UnitOfWork answer = newInstance(childExchange);
        answer.setParentUnitOfWork(this);
        return answer;
    }

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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.useOriginalInMessage = exceptionPolicy.isUseOriginalMessage();
            data.asyncDelayedRedelivery = exceptionPolicy.isAsyncDelayedRedelivery(exchange.getContext());


            // 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 copy = exchange.copy();
        // do not share the unit of work
        copy.setUnitOfWork(null);
        // hand over on completion to the copy if we got any
        UnitOfWork uow = exchange.getUnitOfWork();
        if (handover && uow != null) {
            uow.handoverSynchronization(copy);
        }
        // set a correlation id so we can track back the original exchange
        copy.setProperty(Exchange.CORRELATION_ID, id);
        return copy;
    }

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        }


        boolean sync = processor.process(exchange, new AsyncCallback() {
            public void done(boolean doneSync) {
                try {
                    UnitOfWork uow = exchange.getUnitOfWork();
                    // pop the route context we just used
                    if (uow != null) {
                        uow.popRouteContext();
                    }
                } catch (Exception e) {
                    exchange.setException(e);
                } finally {
                    callback.done(doneSync);

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    public boolean isFailed() {
        return (hasOut() && getOut().isFault()) || getException() != null;
    }


    public boolean isTransacted() {
        UnitOfWork uow = getUnitOfWork();
        if (uow != null) {
            return uow.isTransacted();
        } else {
            return false;
        }
    }

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