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/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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.zeebe.gossip;

import java.time.Duration;

public class GossipMath {

  public static int gossipPeriodsToSpread(int repeatMult, int clusterSize) {
    return repeatMult * ceilLog2(clusterSize);
  }

  public static Duration suspicionTimeout(
      int suspicionMult, int clusterSize, Duration pingInterval) {
    return pingInterval.multipliedBy(suspicionMult * ceilLog2(clusterSize));
  }

  /** Returns ceil(log2(n + 1)). */
  protected static int ceilLog2(int num) {
    return 32 - Integer.numberOfLeadingZeros(num);
  }
}