/
RatingBackend.java
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/
RatingBackend.java
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/*
* Copyright © 2018 Apple Inc. and the ServiceTalk project 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 io.servicetalk.examples.http.service.composition.backends;
import io.servicetalk.concurrent.api.Single;
import io.servicetalk.examples.http.service.composition.pojo.Rating;
import io.servicetalk.http.api.HttpRequest;
import io.servicetalk.http.api.HttpResponse;
import io.servicetalk.http.api.HttpResponseFactory;
import io.servicetalk.http.api.HttpSerializationProvider;
import io.servicetalk.http.api.HttpService;
import io.servicetalk.http.api.HttpServiceContext;
import io.servicetalk.http.api.StreamingHttpService;
import io.servicetalk.http.router.predicate.HttpPredicateRouterBuilder;
import java.util.concurrent.ThreadLocalRandom;
import static io.servicetalk.concurrent.api.Single.succeeded;
/**
* A service that returns {@link Rating}s for an entity.
*/
final class RatingBackend implements HttpService {
private static final String ENTITY_ID_QP_NAME = "entityId";
private final HttpSerializationProvider serializer;
private RatingBackend(HttpSerializationProvider serializer) {
this.serializer = serializer;
}
@Override
public Single<HttpResponse> handle(HttpServiceContext ctx, HttpRequest request,
HttpResponseFactory responseFactory) {
final String entityId = request.queryParameter(ENTITY_ID_QP_NAME);
if (entityId == null) {
return succeeded(responseFactory.badRequest());
}
// Create a random rating
Rating rating = new Rating(entityId, ThreadLocalRandom.current().nextInt(1, 6));
return succeeded(responseFactory.ok().payloadBody(rating, serializer.serializerFor(Rating.class)));
}
static StreamingHttpService newRatingService(HttpSerializationProvider serializer) {
HttpPredicateRouterBuilder routerBuilder = new HttpPredicateRouterBuilder();
return routerBuilder.whenPathStartsWith("/rating")
.thenRouteTo(new RatingBackend(serializer))
.buildStreaming();
}
}