ExecutorFilter.h

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/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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 {

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