text: /*
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * 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.
   */
  
  #pragma once
  
  #include <wangle/service/Service.h>
  
  namespace wangle {
  
  /**
   * A service that runs all requests through an executor.
   */
  template <typename Req, typename Resp = Req>
  class ExecutorFilter : public ServiceFilter<Req, Resp> {
   public:
   explicit ExecutorFilter(
     std::shared_ptr<folly::Executor> exe,
     std::shared_ptr<Service<Req, Resp>> service)
        : ServiceFilter<Req, Resp>(service)
        , exe_(exe) {}
  
   folly::Future<Resp> operator()(Req req) override {
     return via(exe_.get()).thenValue(
       [req = std::move(req), this](auto&&) mutable {
         return (*this->service_)(std::move(req));
       });
    }
  
   private:
    std::shared_ptr<folly::Executor> exe_;
  };
  
  } // namespace wangle
  