content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.bifromq.basecluster.fd;
  
  import io.reactivex.rxjava3.core.Observable;
  import io.reactivex.rxjava3.schedulers.Timed;
  import java.time.Duration;
  import java.util.concurrent.CompletableFuture;
  
  public interface IFailureDetector {
      Duration baseProbeInterval();
  
      Duration baseProbeTimeout();
  
      /**
       * Start the failure detector using a specified member selector
       *
       * @param targetSelector
       */
      void start(IProbingTargetSelector targetSelector);
  
      /**
       * Stop the failure detector
       */
      CompletableFuture<Void> shutdown();
  
      /**
       * Hot observable of probe-succeed target
       *
       * @return
       */
      Observable<Timed<IProbingTarget>> succeeding();
  
      /**
       * Hot observable of probe-fail target
       *
       * @return
       */
      Observable<Timed<IProbingTarget>> suspecting();
  
      void penaltyHealth();
  
      /**
       * Hot observable of scoring the local health based on failure detecting process
       *
       * @return
       */
      Observable<Integer> healthScoring();
  }
  