aspired_versions_manager_builder.h

/* Copyright 2016 Google Inc. All Rights Reserved.
 
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.
==============================================================================*/
 
#ifndef TENSORFLOW_SERVING_CORE_ASPIRED_VERSIONS_MANAGER_BUILDER_H_
#define TENSORFLOW_SERVING_CORE_ASPIRED_VERSIONS_MANAGER_BUILDER_H_
 
#include <vector>
 
#include "tensorflow/core/lib/core/status.h"
#include "tensorflow_serving/core/aspired_versions_manager.h"
#include "tensorflow_serving/core/loader.h"
#include "tensorflow_serving/core/source.h"
#include "tensorflow_serving/core/source_adapter.h"
#include "tensorflow_serving/util/unique_ptr_with_deps.h"
 
namespace tensorflow {
namespace serving {
 
// TODO(b/64163389): revisit the escaped HTML characters in c2devsite toolchain
 
class AspiredVersionsManagerBuilder {
 public:
  using Options = AspiredVersionsManager::Options;
  static Status Create(Options options,
                       std::unique_ptr<AspiredVersionsManagerBuilder>* builder);
 
  ~AspiredVersionsManagerBuilder() = default;
 
  template <typename S>
  void AddSource(std::unique_ptr<S> source);
 
  template <typename S, typename SA, typename... Args>
  void AddSourceChain(std::unique_ptr<S> source,
                      std::unique_ptr<SA> first_source_adapter,
                      std::unique_ptr<Args>... remaining_source_adapters);
 
  std::unique_ptr<Manager> Build();
 
 private:
  explicit AspiredVersionsManagerBuilder(
      std::unique_ptr<AspiredVersionsManager> manager);
 
  template <typename S, typename SA, typename... Args>
  void AddSourceChainImpl(std::unique_ptr<S> source,
                          std::unique_ptr<SA> first_source_adapter,
                          std::unique_ptr<Args>... remaining_source_adapters);
 
  template <typename S>
  void AddSourceChainImpl(std::unique_ptr<S> source);
 
  AspiredVersionsManager* const aspired_versions_manager_;
  UniquePtrWithDeps<Manager> manager_with_sources_;
};
 
//  Implementation details follow. API readers may skip.
 
template <typename S>
void AspiredVersionsManagerBuilder::AddSource(std::unique_ptr<S> source) {
  static_assert(
      std::is_convertible<S*, Source<std::unique_ptr<Loader>>*>::value,
      "Source type should be convertible to Source<std::unique_ptr<Loader>>.");
  ConnectSourceToTarget(source.get(), aspired_versions_manager_);
  manager_with_sources_.AddDependency(std::move(source));
}
 
template <typename S, typename SA, typename... Args>
void AspiredVersionsManagerBuilder::AddSourceChain(
    std::unique_ptr<S> source, std::unique_ptr<SA> first_source_adapter,
    std::unique_ptr<Args>... remaining_source_adapters) {
  AddSourceChainImpl(std::move(source), std::move(first_source_adapter),
                     std::move(remaining_source_adapters)...);
}
 
template <typename S, typename SA, typename... Args>
void AspiredVersionsManagerBuilder::AddSourceChainImpl(
    std::unique_ptr<S> source, std::unique_ptr<SA> first_source_adapter,
    std::unique_ptr<Args>... remaining_source_adapters) {
  auto* const target = first_source_adapter.get();
  AddSourceChainImpl(std::move(first_source_adapter),
                     std::move(remaining_source_adapters)...);
  ConnectSourceToTarget(source.get(), target);
  // We add them in this order because UniquePtrWithDeps will delete them in
  // the inverse order of entry.
  manager_with_sources_.AddDependency(std::move(source));
}
 
template <typename S>
void AspiredVersionsManagerBuilder::AddSourceChainImpl(
    std::unique_ptr<S> source) {
  AddSource(std::move(source));
}
 
}  // namespace serving
}  // namespace tensorflow
 
#endif  // TENSORFLOW_SERVING_CORE_ASPIRED_VERSIONS_MANAGER_BUILDER_H_