content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.csp.sentinel.demo.spring.webflux.service;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ThreadLocalRandom;
  
  import org.springframework.stereotype.Service;
  import reactor.core.publisher.Flux;
  import reactor.core.publisher.Mono;
  import reactor.core.scheduler.Scheduler;
  import reactor.core.scheduler.Schedulers;
  
  /**
   * @author Eric Zhao
   */
  @Service
  public class FooService {
  
      @SuppressWarnings("PMD.ThreadPoolCreationRule")
      private final ExecutorService pool = Executors.newFixedThreadPool(8);
      private final Scheduler scheduler = Schedulers.fromExecutor(pool);
  
      public Mono<String> emitSingle() {
          return Mono.just(ThreadLocalRandom.current().nextInt(0, 2000))
              .map(e -> e + "d");
      }
  
      public Flux<Integer> emitMultiple() {
          int start = ThreadLocalRandom.current().nextInt(0, 6000);
          return Flux.range(start, 10);
      }
  
      public Mono<String> doSomethingSlow() {
          return Mono.fromCallable(() -> {
              Thread.sleep(2000);
              System.out.println("doSomethingSlow: " + Thread.currentThread().getName());
              return "ok";
          }).publishOn(scheduler);
      }
  }
  