com.redhat.coolstore.api_gateway.RatingGateway.java Source code

Introduction

Here is the source code for com.redhat.coolstore.api_gateway.RatingGateway.java

Source

/**
 * JBoss, Home of Professional Open Source
 * Copyright 2016, Red Hat, Inc. and/or its affiliates, and individual
 * contributors by the @authors tag. See the copyright.txt in the
 * distribution for a full listing of individual contributors.
 * <p/>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.redhat.coolstore.api_gateway;

import com.redhat.coolstore.api_gateway.model.Product;
import com.redhat.coolstore.api_gateway.model.Rating;
import com.redhat.coolstore.api_gateway.model.ShoppingCart;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.http4.HttpMethods;
import org.apache.camel.component.jackson.JacksonDataFormat;
import org.apache.camel.component.jackson.ListJacksonDataFormat;
import org.apache.camel.model.dataformat.JsonLibrary;
import org.apache.camel.model.rest.RestBindingMode;
import org.apache.camel.model.rest.RestParamType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;

@Component
public class RatingGateway extends RouteBuilder {
    private static final Logger LOG = LoggerFactory.getLogger(RatingGateway.class);

    @Value("${hystrix.executionTimeout}")
    private int hystrixExecutionTimeout;

    @Value("${hystrix.groupKey}")
    private String hystrixGroupKey;

    @Value("${hystrix.circuitBreakerEnabled}")
    private boolean hystrixCircuitBreakerEnabled;

    @Autowired
    private Environment env;

    @Override
    public void configure() throws Exception {
        try {
            getContext().setTracing(Boolean.parseBoolean(env.getProperty("ENABLE_TRACER", "false")));
        } catch (Exception e) {
            LOG.error("Failed to parse the ENABLE_TRACER value: {}", env.getProperty("ENABLE_TRACER", "false"));
        }

        restConfiguration().component("servlet").bindingMode(RestBindingMode.auto).apiContextPath("/api-docs")
                .contextPath("/api").apiProperty("host", "")
                .apiProperty("api.title", "CoolStore Microservice API Gateway").apiProperty("api.version", "1.0.0")
                .apiProperty("api.description",
                        "The API of the gateway which fronts the various backend microservices in the CoolStore")
                .apiProperty("api.contact.name", "Red Hat Developers")
                .apiProperty("api.contact.email", "developers@redhat.com")
                .apiProperty("api.contact.url", "https://developers.redhat.com");

        rest("/rating").description("Product Rating Service").produces(MediaType.APPLICATION_JSON_VALUE)

                .post("/{itemId}/{rating}").description("Add product rating").param().name("itemId")
                .type(RestParamType.path).description("The ID of the item to process").dataType("string").endParam()
                .param().name("rating").type(RestParamType.path).description("The rating from 1-5").dataType("int")
                .endParam().outType(Rating.class).route().id("submitRatingRoute").hystrix()
                .id("Rating Service (Add Rating)").hystrixConfiguration()
                .executionTimeoutInMilliseconds(hystrixExecutionTimeout).groupKey(hystrixGroupKey)
                .circuitBreakerEnabled(hystrixCircuitBreakerEnabled).end().removeHeaders("CamelHttp*")
                .setBody(simple("null")).setHeader(Exchange.HTTP_METHOD, HttpMethods.POST)
                .setHeader(Exchange.HTTP_URI, simple(
                        "http://{{env:RATING_ENDPOINT:rating:8080}}/api/rating/${header.itemId}/${header.rating}"))
                .to("http4://DUMMY").onFallback().setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
                .to("direct:submitRatingFallback").end()
                .setHeader("CamelJacksonUnmarshalType", simple(Rating.class.getName())).unmarshal()
                .json(JsonLibrary.Jackson, Rating.class).endRest();

        // Provide a response
        from("direct:submitRatingFallback").routeId("submitratingfallback")
                .description("Submit Rating Fall back response")
                .process(exchange -> exchange.getIn().setBody(new Rating())).marshal().json(JsonLibrary.Jackson);

    }

}