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 accord.api;
  
  import javax.annotation.Nullable;
  
  import accord.coordinate.ExecutePath;
  import accord.local.Node;
  import accord.primitives.Ballot;
  import accord.primitives.Deps;
  import accord.primitives.Status.Durability;
  import accord.primitives.TxnId;
  
  public interface CoordinatorEventListener
  {
      default void onPreAccepted(TxnId txnId) {}
      default void onAccepted(TxnId txnId, Ballot ballot) {}
      default void onExecuting(TxnId txnId, @Nullable Ballot ballot, Deps deps, @Nullable ExecutePath path) {}
      default void onExecuted(TxnId txnId, Ballot ballot) {}
      default void onDurable(Durability durability, @Nullable Ballot ballot, TxnId txnId) {}
      default void onRecoveryStarted(TxnId txnId, Ballot ballot) {}
  
      /**
       * For use by implementations to decide what to do about successfully recovered transactions.
       * Specifically intended to define if and how they should inform clients of the result.
       * e.g. in Maelstrom we send the full result directly, in other impls we may simply acknowledge success via the coordinator
       *
       * Note: may be invoked multiple times in different places
       */
      default void onRecoveryStopped(Node node, TxnId txnId, Ballot ballot, Result success, Throwable fail) {}
  
      default void onInvalidated(TxnId txnId) {}
      default void onRejected(TxnId txnId) {}
      default void onEpochTimeout(long epoch) {}
      default void onExhausted(@Nullable TxnId txnId) {}
      default void onPreempted(@Nullable TxnId txnId) {}
      default void onTimeout(@Nullable TxnId txnId) {}
  
      CoordinatorEventListener NOOP = new CoordinatorEventListener()
      {
      };
  }
  