forked from spring-petclinic/spring-petclinic-cloud
/
ApiGatewayController.java
81 lines (67 loc) · 2.92 KB
/
ApiGatewayController.java
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/*
* Copyright 2002-2017 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 org.springframework.samples.petclinic.api.boundary.web;
import java.util.function.Function;
import java.util.stream.Collectors;
import org.springframework.cloud.client.circuitbreaker.ReactiveCircuitBreaker;
import org.springframework.cloud.client.circuitbreaker.ReactiveCircuitBreakerFactory;
import org.springframework.samples.petclinic.api.application.CustomersServiceClient;
import org.springframework.samples.petclinic.api.application.VisitsServiceClient;
import org.springframework.samples.petclinic.api.dto.OwnerDetails;
import org.springframework.samples.petclinic.api.dto.Visits;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import lombok.RequiredArgsConstructor;
import reactor.core.publisher.Mono;
/**
* @author Maciej Szarlinski
*/
@RestController
@RequiredArgsConstructor
@RequestMapping("/api/gateway")
public class ApiGatewayController {
private final CustomersServiceClient customersServiceClient;
private final VisitsServiceClient visitsServiceClient;
private final ReactiveCircuitBreakerFactory<?, ?> cbFactory;
@GetMapping(value = "owners/{ownerId}")
public Mono<OwnerDetails> getOwnerDetails(final @PathVariable int ownerId) {
return customersServiceClient.getOwner(ownerId)
.flatMap(owner ->
visitsServiceClient.getVisitsForPets(owner.getPetIds())
.transform(it -> {
ReactiveCircuitBreaker cb = cbFactory.create("getOwnerDetails");
return cb.run(it, throwable -> emptyVisitsForPets());
})
.map(addVisitsToOwner(owner))
);
}
private Function<Visits, OwnerDetails> addVisitsToOwner(OwnerDetails owner) {
return visits -> {
owner.getPets()
.forEach(pet -> pet.getVisits()
.addAll(visits.getItems().stream()
.filter(v -> v.getPetId() == pet.getId())
.collect(Collectors.toList()))
);
return owner;
};
}
private Mono<Visits> emptyVisitsForPets() {
return Mono.just(new Visits());
}
}