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.cassandra.locator;
  
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import java.util.Map;
  import java.util.List;
  
  public interface DynamicEndpointSnitchMBean 
  {
      public Map<String, Double> getScoresWithPort();
      /** @deprecated See CASSANDRA-7544 */
      @Deprecated(since = "4.0")
      public Map<InetAddress, Double> getScores();
      public int getUpdateInterval();
      public int getResetInterval();
      public double getBadnessThreshold();
      public String getSubsnitchClassName();
      public List<Double> dumpTimings(String hostname) throws UnknownHostException;
  
      /**
       * Setting a Severity allows operators to inject preference information into the Dynamic Snitch
       * replica selection.
       *
       * When choosing which replicas to participate in a read request, the DSnitch sorts replicas
       * by response latency, and selects the fastest replicas.  Latencies are normalized to a score
       * from 0 to 1,  with lower scores being faster.
       *
       * The Severity injected here will be added to the normalized score.
       *
       * Thus, adding a Severity greater than 1 will mean the replica will never be contacted
       * (unless needed for ALL or if it is added later for rapid read protection).
       *
       * Conversely, adding a negative Severity means the replica will *always* be contacted.
       *
       * (The "Severity" term is historical and dates to when this was used to represent how
       * badly background tasks like compaction were affecting a replica's performance.
       * See CASSANDRA-3722 for when this was introduced and CASSANDRA-11738 for why it was removed.)
       */
      public void setSeverity(double severity);
  
      /**
       * @return the current manually injected Severity.
       */
      public double getSeverity();
  }
  