RequestHandlerFactory.h

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/*
 *  Copyright (c) 2015-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */
#pragma once

#include <proxygen/httpserver/RequestHandler.h>

namespace proxygen {

class RequestHandlerFactory {
 public:
  virtual ~RequestHandlerFactory() {}

  virtual void onServerStart(folly::EventBase* evb) noexcept = 0;

  virtual void onServerStop() noexcept = 0;

  virtual RequestHandler* onRequest(RequestHandler*, HTTPMessage*) noexcept = 0;
};

class RequestHandlerChain {
 public:
  std::vector<std::unique_ptr<RequestHandlerFactory>> build() {
    return std::move(chain_);
  }

  template <typename T, typename... Args>
  RequestHandlerChain& addThen(Args&&... args) {
    chain_.push_back(std::make_unique<T>(std::forward<Args>(args)...));
    return *this;
  }

  RequestHandlerChain& addThen(std::unique_ptr<RequestHandlerFactory> h) {
    chain_.push_back(std::move(h));
    return *this;
  }

 private:
  std::vector<std::unique_ptr<RequestHandlerFactory>> chain_;
};

}