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.basescheduler.spi;
  
  import java.util.concurrent.CompletableFuture;
  
  /**
   * A call scheduler is used for scheduling call before actually being submitted for batching.
   *
   * @param <ReqT> the request type
   */
  public interface ICallScheduler<ReqT> {
      /**
       * Schedule a call to be called in the future when the returned future completed. The returned future could be
       * completed with DropException
       *
       * @param request the request to be scheduled
       * @return the future of the request to be invoked
       */
      default CompletableFuture<ReqT> submit(ReqT request) {
          return CompletableFuture.completedFuture(request);
      }
  
      /**
       * Close the call scheduler.
       */
      default void close() {
      }
  }
  