Package org.apache.camel.component.http

Examples of org.apache.camel.component.http.HttpConsumer

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    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {

            // Is there a consumer registered for the request.
            HttpConsumer consumer = resolve(request);
            if (consumer == null) {
                response.sendError(HttpServletResponse.SC_NOT_FOUND);
                return;
            }

            // HttpExchange exchange =
            // (HttpExchange)request.getAttribute(EXCHANGE_ATTRIBUTE);
            // if( exchange == null ) {
            // exchange = new HttpExchange(consumer.getEndpoint(), request,
            // response);
            // }
            // Continuation continuation =
            // ContinuationSupport.getContinuation(request, exchange);

            final Continuation continuation = ContinuationSupport.getContinuation(request, null);
            if (continuation.isNew()) {

                // Have the camel process the HTTP exchange.
                final HttpExchange exchange = new HttpExchange(consumer.getEndpoint(), request, response);
                boolean sync = consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
                    public void done(boolean sync) {
                        if (sync) {
                            return;
                        }
                        continuation.setObject(exchange);
                        continuation.resume();
                    }
                });

                if (!sync) {

                    // Wait for the exchange to get processed.
                    // This might block until it completes or it might return via an exception and
                    // then this method is re-invoked once the the exchange has finished processing
                    continuation.suspend(0);

                }

                // HC: The getBinding() is interesting because it illustrates the
                // impedance miss-match between
                // HTTP's stream oriented protocol, and Camels more message oriented
                // protocol exchanges.

                // now lets output to the response
                consumer.getBinding().writeResponse(exchange, response);
                return;
            }

            if (continuation.isResumed()) {
                HttpExchange exchange = (HttpExchange)continuation.getObject();
                // now lets output to the response
                consumer.getBinding().writeResponse(exchange, response);
                return;
            }


        } catch (Exception e) {
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        }
    }

    @Override
    public Consumer createConsumer(Processor processor) throws Exception {
        return new HttpConsumer(this, processor);
    }  
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    @Override
    protected void service(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
        log.trace("Service: {}", request);

        // is there a consumer registered for the request.
        HttpConsumer consumer = resolve(request);
        if (consumer == null) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }

        if (consumer.getEndpoint().getHttpMethodRestrict() != null
            && !consumer.getEndpoint().getHttpMethodRestrict().equals(request.getMethod())) {
            response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
            return;
        }

        if ("TRACE".equals(request.getMethod()) && !consumer.isTraceEnabled()) {
            response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
            return;
        }
       
        final Exchange result = (Exchange) request.getAttribute(EXCHANGE_ATTRIBUTE_NAME);
        if (result == null) {
            // no asynchronous result so leverage continuation
            final Continuation continuation = ContinuationSupport.getContinuation(request);
            if (continuation.isInitial() && continuationTimeout != null) {
                // set timeout on initial
                continuation.setTimeout(continuationTimeout);
            }

            // are we suspended and a request is dispatched initially?
            if (consumer.isSuspended() && continuation.isInitial()) {
                response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
                return;
            }

            if (continuation.isExpired()) {
                String id = (String) continuation.getAttribute(EXCHANGE_ATTRIBUTE_ID);
                // remember this id as expired
                expiredExchanges.put(id, id);
                log.warn("Continuation expired of exchangeId: {}", id);
                response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
                return;
            }

            // a new request so create an exchange
            final Exchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);
            if (consumer.getEndpoint().isBridgeEndpoint()) {
                exchange.setProperty(Exchange.SKIP_GZIP_ENCODING, Boolean.TRUE);
            }
            if (consumer.getEndpoint().isDisableStreamCache()) {
                exchange.setProperty(Exchange.DISABLE_HTTP_STREAM_CACHE, Boolean.TRUE);
            }
           
            HttpHelper.setCharsetFromContentType(request.getContentType(), exchange);
           
            exchange.setIn(new HttpMessage(exchange, request, response));
            // set context path as header
            String contextPath = consumer.getEndpoint().getPath();
            exchange.getIn().setHeader("CamelServletContextPath", contextPath);
           
            String httpPath = (String)exchange.getIn().getHeader(Exchange.HTTP_PATH);
            // here we just remove the CamelServletContextPath part from the HTTP_PATH
            if (contextPath != null
                && httpPath.startsWith(contextPath)) {
                exchange.getIn().setHeader(Exchange.HTTP_PATH,
                        httpPath.substring(contextPath.length()));
            }
           
            log.trace("Suspending continuation of exchangeId: {}", exchange.getExchangeId());
            continuation.setAttribute(EXCHANGE_ATTRIBUTE_ID, exchange.getExchangeId());
            // must suspend before we process the exchange
            continuation.suspend();

            ClassLoader oldTccl = overrideTccl(exchange);
           
            log.trace("Processing request for exchangeId: {}", exchange.getExchangeId());
            // use the asynchronous API to process the exchange
           
            consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
                public void done(boolean doneSync) {
                    // check if the exchange id is already expired
                    boolean expired = expiredExchanges.remove(exchange.getExchangeId()) != null;
                    if (!expired) {
                        log.trace("Resuming continuation of exchangeId: {}", exchange.getExchangeId());
                        // resume processing after both, sync and async callbacks
                        continuation.setAttribute(EXCHANGE_ATTRIBUTE_NAME, exchange);
                        continuation.resume();
                    } else {
                        log.warn("Cannot resume expired continuation of exchangeId: {}", exchange.getExchangeId());
                    }
                }
            });

            if (oldTccl != null) {
                restoreTccl(exchange, oldTccl);
            }
           
            // return to let Jetty continuation to work as it will resubmit and invoke the service
            // method again when its resumed
            return;
        }

        try {
            log.trace("Resumed continuation and writing response for exchangeId: {}", result.getExchangeId());
            // now lets output to the response
            consumer.getBinding().writeResponse(result, response);
        } catch (IOException e) {
            log.error("Error processing request", e);
            throw e;
        } catch (Exception e) {
            log.error("Error processing request", e);
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        String reply = template.requestBody(serverUri, "World", String.class);
        assertEquals("Bye World", reply);

        // now suspend jetty
        HttpConsumer consumer = (HttpConsumer) context.getRoute("route1").getConsumer();
        assertNotNull(consumer);

        // suspend
        consumer.suspend();

        try {
            template.requestBody(serverUri, "Moon", String.class);
            fail("Should throw exception");
        } catch (Exception e) {
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        String reply = template.requestBody(serverUri, "World", String.class);
        assertEquals("Bye World", reply);

        // now suspend jetty
        HttpConsumer consumer = (HttpConsumer) context.getRoute("route1").getConsumer();
        assertNotNull(consumer);

        // suspend
        consumer.suspend();

        try {
            template.requestBody(serverUri, "Moon", String.class);
            fail("Should throw exception");
        } catch (Exception e) {
            HttpOperationFailedException cause = assertIsInstanceOf(HttpOperationFailedException.class, e.getCause());
            assertEquals(503, cause.getStatusCode());
        }

        // resume
        consumer.resume();

        // and send request which should be processed
        reply = template.requestBody(serverUri, "Moon", String.class);
        assertEquals("Bye Moon", reply);
    }
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        }
    }

    @Override
    public Consumer createConsumer(Processor processor) throws Exception {
        return new HttpConsumer(this, processor);
    }  
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    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            // Is there a consumer registered for the request.
            HttpConsumer consumer = resolve(request);
            if (consumer == null) {
                response.sendError(HttpServletResponse.SC_NOT_FOUND);
                return;
            }

            final Continuation continuation = ContinuationSupport.getContinuation(request);

            // are we suspended and a request is dispatched initially?
            if (consumer.isSuspended() && continuation.isInitial()) {
                response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
                return;
            }

            if (continuation.isInitial()) {
                // a new request so create an exchange
                final Exchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);
                if (consumer.getEndpoint().isBridgeEndpoint()) {
                    exchange.setProperty(Exchange.SKIP_GZIP_ENCODING, Boolean.TRUE);
                }
                if (consumer.getEndpoint().isDisableStreamCache()) {
                    exchange.setProperty(Exchange.DISABLE_HTTP_STREAM_CACHE, Boolean.TRUE);
                }
                exchange.setIn(new HttpMessage(exchange, request, response));

                if (log.isTraceEnabled()) {
                    log.trace("Suspending continuation of exchangeId: " + exchange.getExchangeId());
                }
                continuation.suspend();

                // use the asynchronous API to process the exchange
                consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
                    public void done(boolean doneSync) {
                        if (log.isTraceEnabled()) {
                            log.trace("Resuming continuation of exchangeId: " + exchange.getExchangeId());
                        }
                        // resume processing after both, sync and async callbacks
                        continuation.setAttribute(EXCHANGE_ATTRIBUTE_NAME, exchange);
                        continuation.resume();
                    }
                });
                return;
            }

            if (continuation.isResumed()) {
                // a re-dispatched request containing the processing result
                Exchange exchange = (Exchange) continuation.getAttribute(EXCHANGE_ATTRIBUTE_NAME);
                if (log.isTraceEnabled()) {
                    log.trace("Resuming continuation of exchangeId: " + exchange.getExchangeId());
                }

                // now lets output to the response
                if (log.isTraceEnabled()) {
                    log.trace("Writing response of exchangeId: " + exchange.getExchangeId());
                }
                consumer.getBinding().writeResponse(exchange, response);
            }
        } catch (IOException e) {
            log.error("Error processing request", e);
            throw e;
        } catch (Exception e) {
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    @Override
    protected void service(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
        log.trace("Service: {}", request);

        // is there a consumer registered for the request.
        HttpConsumer consumer = resolve(request);
        if (consumer == null) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }

        if (consumer.getEndpoint().getHttpMethodRestrict() != null
            && !consumer.getEndpoint().getHttpMethodRestrict().equals(request.getMethod())) {
            response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
            return;
        }

        if ("TRACE".equals(request.getMethod()) && !consumer.isTraceEnabled()) {
            response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
            return;
        }
       
        final Exchange result = (Exchange) request.getAttribute(EXCHANGE_ATTRIBUTE_NAME);
        if (result == null) {
            // no asynchronous result so leverage continuation
            final Continuation continuation = ContinuationSupport.getContinuation(request);
            if (continuation.isInitial() && continuationTimeout != null) {
                // set timeout on initial
                continuation.setTimeout(continuationTimeout);
            }

            // are we suspended and a request is dispatched initially?
            if (consumer.isSuspended() && continuation.isInitial()) {
                response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
                return;
            }

            if (continuation.isExpired()) {
                String id = (String) continuation.getAttribute(EXCHANGE_ATTRIBUTE_ID);
                // remember this id as expired
                expiredExchanges.put(id, id);
                log.warn("Continuation expired of exchangeId: {}", id);
                response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
                return;
            }

            // a new request so create an exchange
            final Exchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);

            if (consumer.getEndpoint().isBridgeEndpoint()) {
                exchange.setProperty(Exchange.SKIP_GZIP_ENCODING, Boolean.TRUE);
            }
            if (consumer.getEndpoint().isDisableStreamCache()) {
                exchange.setProperty(Exchange.DISABLE_HTTP_STREAM_CACHE, Boolean.TRUE);
            }
           
            HttpHelper.setCharsetFromContentType(request.getContentType(), exchange);
           
            exchange.setIn(new HttpMessage(exchange, request, response));
            // set context path as header
            String contextPath = consumer.getEndpoint().getPath();
            exchange.getIn().setHeader("CamelServletContextPath", contextPath);
           
            String httpPath = (String)exchange.getIn().getHeader(Exchange.HTTP_PATH);
            // here we just remove the CamelServletContextPath part from the HTTP_PATH
            if (contextPath != null
                && httpPath.startsWith(contextPath)) {
                exchange.getIn().setHeader(Exchange.HTTP_PATH,
                        httpPath.substring(contextPath.length()));
            }

            if (log.isTraceEnabled()) {
                log.trace("Suspending continuation of exchangeId: {}", exchange.getExchangeId());
            }
            continuation.setAttribute(EXCHANGE_ATTRIBUTE_ID, exchange.getExchangeId());

            // we want to handle the UoW
            try {
                consumer.createUoW(exchange);
            } catch (Exception e) {
                log.error("Error processing request", e);
                throw new ServletException(e);
            }

            // must suspend before we process the exchange
            continuation.suspend();

            ClassLoader oldTccl = overrideTccl(exchange);

            if (log.isTraceEnabled()) {
                log.trace("Processing request for exchangeId: {}", exchange.getExchangeId());
            }
            // use the asynchronous API to process the exchange
           
            consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
                public void done(boolean doneSync) {
                    // check if the exchange id is already expired
                    boolean expired = expiredExchanges.remove(exchange.getExchangeId()) != null;
                    if (!expired) {
                        if (log.isTraceEnabled()) {
                            log.trace("Resuming continuation of exchangeId: {}", exchange.getExchangeId());
                        }
                        // resume processing after both, sync and async callbacks
                        continuation.setAttribute(EXCHANGE_ATTRIBUTE_NAME, exchange);
                        continuation.resume();
                    } else {
                        log.warn("Cannot resume expired continuation of exchangeId: {}", exchange.getExchangeId());
                    }
                }
            });

            if (oldTccl != null) {
                restoreTccl(exchange, oldTccl);
            }
           
            // return to let Jetty continuation to work as it will resubmit and invoke the service
            // method again when its resumed
            return;
        }

        try {
            // now lets output to the response
            if (log.isTraceEnabled()) {
                log.trace("Resumed continuation and writing response for exchangeId: {}", result.getExchangeId());
            }
            Integer bs = consumer.getEndpoint().getResponseBufferSize();
            if (bs != null) {
                log.trace("Using response buffer size: {}", bs);
                response.setBufferSize(bs);
            }
            consumer.getBinding().writeResponse(result, response);
        } catch (IOException e) {
            log.error("Error processing request", e);
            throw e;
        } catch (Exception e) {
            log.error("Error processing request", e);
            throw new ServletException(e);
        } finally {
            consumer.doneUoW(result);
        }
    }
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        return super.createProducer();
    }

    @Override
    public Consumer createConsumer(Processor processor) throws Exception {
        return new HttpConsumer(this, processor);
    }
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      // return new JettyHttpProducer(this);
    }

    @Override
    public Consumer<HttpExchange> createConsumer(Processor processor) throws Exception {
        return new HttpConsumer(this, processor);
    }
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  • org.apache.camel.component.jetty.JettySuspendTest
  • org.apache.camel.component.servlet.ServletEndpoint
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