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.basecrdt.core.api;
  
  import org.apache.bifromq.basecrdt.proto.Replica;
  import io.reactivex.rxjava3.core.Observable;
  import java.util.concurrent.CompletableFuture;
  
  /**
   * The interface of a Causal CRDT.
   *
   * @param <O> the type of the CRDT operation
   */
  public interface ICausalCRDT<O extends ICRDTOperation> {
      /**
       * The identity of the CRDT replica.
       *
       * @return the id
       */
      Replica id();
  
      /**
       * The type of the replica.
       *
       * @return the CRDT type
       */
      CausalCRDTType type();
  
      /**
       * Execute an CRDT operation asynchronously.
       *
       * @param op the operation
       * @return a future of the execution
       */
      CompletableFuture<Void> execute(O op);
  
      /**
       * The observable of inflation happens to the CRDT state overtime.
       *
       * @return an observable of inflation event
       */
      Observable<Long> inflation();
  }
  