/*
 * Copyright contributors to Hyperledger Besu.
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
package org.hyperledger.besu.consensus.merge;

import org.hyperledger.besu.ethereum.core.Difficulty;

import java.util.Optional;

/** The interface Merge state handler. */
public interface MergeStateHandler {

  /**
   * Merge state changed.
   *
   * @param isPoS the is PoS
   * @param priorState the prior state
   * @param difficultyStoppedAt the difficulty stopped at
   */
  void mergeStateChanged(
      final boolean isPoS,
      final Optional<Boolean> priorState,
      final Optional<Difficulty> difficultyStoppedAt);
}
