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Core components supporting the Micronaut Framework
There is a newer version: 4.6.5
/*
 * Copyright 2017-2019 original 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.micronaut.management.endpoint.routes.impl;

import io.micronaut.context.annotation.Requires;
import io.micronaut.http.MediaType;
import io.micronaut.management.endpoint.routes.RouteData;
import io.micronaut.management.endpoint.routes.RouteDataCollector;
import io.micronaut.management.endpoint.routes.RoutesEndpoint;
import io.micronaut.scheduling.TaskExecutors;
import io.micronaut.web.router.UriRoute;
import io.reactivex.Flowable;
import io.reactivex.schedulers.Schedulers;
import org.reactivestreams.Publisher;

import javax.inject.Named;
import javax.inject.Singleton;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * A RxJava route data collector.
 *
 * @author James Kleeh
 * @since 1.0
 */
@Singleton
@Requires(beans = RoutesEndpoint.class)
public class RxJavaRouteDataCollector implements RouteDataCollector> {

    private final RouteData routeData;
    private final ExecutorService executorService;

    /**
     * @param routeData       The RouteData
     * @param executorService The executor service
     */
    public RxJavaRouteDataCollector(RouteData routeData,
                                    @Named(TaskExecutors.IO) ExecutorService executorService) {
        this.routeData = routeData;
        this.executorService = executorService;
    }

    @Override
    public Publisher> getData(Stream routes) {
        List routeList = routes.collect(Collectors.toList());
        Map routeMap = new LinkedHashMap<>(routeList.size());

        return Flowable
            .fromIterable(routeList)
            .subscribeOn(Schedulers.from(executorService))
            .collectInto(routeMap, (map, route) ->
                map.put(getRouteKey(route), routeData.getData(route))
            ).toFlowable();
    }

    /**
     * @param route The URI route
     * @return The route key
     */
    protected String getRouteKey(UriRoute route) {
        String produces = route
            .getProduces()
            .stream()
            .map(MediaType::toString)
            .collect(Collectors.joining(" || "));

        return new StringBuilder("{[")
            .append(route.getUriMatchTemplate())
            .append("],method=[")
            .append(route.getHttpMethod().name())
            .append("],produces=[")
            .append(produces)
            .append("]}")
            .toString();
    }
}