demo.service.impl.DefaultServiceLocationService.java Source code

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Here is the source code for demo.service.impl.DefaultServiceLocationService.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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 demo.service.impl;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.hateoas.Resource;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;

import demo.model.CurrentPosition;
import demo.model.ServiceLocation;
import demo.model.VehicleStatus;
import demo.service.ServiceLocationService;

/**
 *
 * @author Gunnar Hillert
 *
 */
@Service
public class DefaultServiceLocationService implements ServiceLocationService {

    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultServiceLocationService.class);

    @Autowired
    @LoadBalanced
    private RestTemplate restTemplate;

    /**
     * Enriches the provided {@link CurrentPosition} with the closest service location
     * IF the {@link CurrentPosition} has a {@link VehicleStatus} of:
     *
     * <ul>
     *   <li>{@link VehicleStatus#SERVICE_NOW}</li>
     *   <li>{@link VehicleStatus#SERVICE_SOON}</li>
     *   <li>{@link VehicleStatus#STOP_NOW}</li>
     * <ul>
     *
     * @param currentPosition Will be enriched with the closest service location
     * @throws Exception
     */
    @HystrixCommand(commandKey = "serviceLocations", commandProperties = {
            //@HystrixProperty(name = "circuitBreaker.forceOpen", value = "true")
    }, fallbackMethod = "handleServiceLocationServiceFailure")
    @Override
    public void updateServiceLocations(CurrentPosition currentPosition) {

        switch (currentPosition.getVehicleStatus()) {

        case SERVICE_NOW:
        case SERVICE_SOON:
        case STOP_NOW:
            ResponseEntity<Resource<ServiceLocation>> result = this.restTemplate.exchange(
                    "http://service-location-service/serviceLocations/search/findFirstByLocationNear?location={lat},{long}",
                    HttpMethod.GET, new HttpEntity<Void>((Void) null),
                    new ParameterizedTypeReference<Resource<ServiceLocation>>() {
                    }, currentPosition.getLocation().getLatitude(), currentPosition.getLocation().getLongitude());
            if (result.getStatusCode() == HttpStatus.OK && result.getBody().getContent() != null) {
                currentPosition.setServiceLocation(result.getBody().getContent());
            }
            break;
        default:
        }

    }

    public void handleServiceLocationServiceFailure(CurrentPosition currentPosition) {
        LOGGER.error("Hystrix Fallback Method. Unable to retrieve service station info.");
    }
}