Delete blimp/helium and remove references to it from dependent targets

blimp/helium/compound_syncable.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BLIMP_HELIUM_COMPOUND_SYNCABLE_H_
-#define BLIMP_HELIUM_COMPOUND_SYNCABLE_H_
-
-#include <stdint.h>
-#include <map>
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/memory/ptr_util.h"
-#include "base/stl_util.h"
-#include "blimp/helium/blimp_helium_export.h"
-#include "blimp/helium/serializable_struct.h"
-#include "blimp/helium/syncable.h"
-#include "third_party/protobuf/src/google/protobuf/io/coded_stream.h"
-#include "third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl_lite.h"
-
-namespace blimp {
-namespace helium {
-
-struct CompoundChangeset;
-
-// Base class for defining Syncables that are containers for other Syncables.
-// It manages an internal registry of child Syncables that is declaratively
-// populated at class construction time. It manages serialization and
-// deserialization across its registered Syncables, combining the serialized
-// output inside a simple map-based changeset.
-//
-// Example usage:
-//
-//   struct ParentSyncable : public CompoundSyncable {
-//     explicit ParentSyncable()
-//         : child1(CreateAndRegister<Child1>()),
-//           child2(CreateAndRegister<Child2>()) {}
-//
-//     RegisteredSyncable<Child1> child1;
-//     RegisteredSyncable<Child2> child2;
-//
-//    private:
-//     DISALLOW_COPY_AND_ASSIGN(SampleCompoundSyncable);
-//   };
-//
-class BLIMP_HELIUM_EXPORT CompoundSyncable
-    : public Syncable<CompoundChangeset> {
- public:
-  CompoundSyncable();
-  ~CompoundSyncable() override;
-
-  // Syncable implementation.
-  std::unique_ptr<CompoundChangeset> CreateChangeset(
-      Revision from) const override;
-  void ApplyChangeset(const CompoundChangeset& changeset) override;
-  void ReleaseBefore(Revision from) override;
-  Revision GetRevision() const override;
-  bool ValidateChangeset(const CompoundChangeset& changeset) const override;
-  void SetLocalUpdateCallback(
-      const base::Closure& local_update_callback) override;
-
- protected:
-  // Defines the methods needed to access changesets and revision in Syncables
-  // in a Syncable type-agnostic manner, so that they may be accessed in an
-  // aggregated fashion using |members_|.
-  class RegisteredSyncableBase {
-   public:
-    virtual ~RegisteredSyncableBase() = default;
-
-    // Parses and validate a changeset from |input_stream|.
-    // The parsed changeset is retained within |this| for later use by
-    // ApplyChangeset().
-    // Returns true if the parse and validation steps both succeded.
-    virtual bool ParseAndValidate(
-        google::protobuf::io::CodedInputStream* input_stream) = 0;
-    virtual void ApplyChangeset() = 0;
-
-    // Methods to be proxied directly to the Syncable implementation.
-    virtual Revision GetRevision() = 0;
-    virtual void CreateChangeset(
-        Revision from,
-        google::protobuf::io::CodedOutputStream* output_stream) const = 0;
-    virtual void SetLocalUpdateCallback(
-        const base::Closure& local_update_callback) = 0;
-    virtual void ReleaseBefore(Revision revision) = 0;
-  };
-
-  template <typename SyncableType>
-  class RegisteredSyncable : public RegisteredSyncableBase {
-   public:
-    ~RegisteredSyncable() = default;
-    RegisteredSyncable(RegisteredSyncable<SyncableType>&& other) = default;
-
-    SyncableType* get() { return member_.get(); }
-    SyncableType* operator->() { return member_.get(); }
-
-    // RegisteredSyncableBase implementation.
-    bool ParseAndValidate(
-        google::protobuf::io::CodedInputStream* input_stream) override;
-    virtual void ApplyChangeset();
-    Revision GetRevision() override;
-    void CreateChangeset(
-        Revision from,
-        google::protobuf::io::CodedOutputStream* output_stream) const override;
-    void SetLocalUpdateCallback(
-        const base::Closure& local_update_callback) override;
-    void ReleaseBefore(Revision revision) override;
-
-   private:
-    friend class CompoundSyncable;
-
-    // Make class only constructable by CompoundSyncable, so that there is a
-    // strong guarantee that a RegisteredSyncable was created by
-    // SyncableRegistry::CreateAndRegister().
-    explicit RegisteredSyncable(std::unique_ptr<SyncableType> member)
-        : member_(std::move(member)) {}
-
-    std::unique_ptr<SyncableType> member_;
-    std::unique_ptr<typename SyncableType::Changeset> parsed_changeset_;
-
-    DISALLOW_COPY_AND_ASSIGN(RegisteredSyncable);
-  };
-
-  template <typename T, typename... ConstructorArgs>
-  RegisteredSyncable<T> CreateAndRegister(ConstructorArgs... args);
-
- private:
-  // Tracks all Syncables* which have been created with CreateAndRegister().
-  std::vector<RegisteredSyncableBase*> members_;
-
-  DISALLOW_COPY_AND_ASSIGN(CompoundSyncable);
-};
-
-template <typename SyncableType>
-bool CompoundSyncable::RegisteredSyncable<SyncableType>::ParseAndValidate(
-    google::protobuf::io::CodedInputStream* input_stream) {
-  DCHECK(!parsed_changeset_);
-  parsed_changeset_ = base::MakeUnique<typename SyncableType::Changeset>();
-  return (parsed_changeset_->Parse(input_stream) &&
-          member_->ValidateChangeset(*parsed_changeset_));
-}
-
-template <typename SyncableType>
-void CompoundSyncable::RegisteredSyncable<SyncableType>::ApplyChangeset() {
-  DCHECK(parsed_changeset_);
-  member_->ApplyChangeset(*parsed_changeset_);
-  parsed_changeset_.reset();
-}
-
-template <typename SyncableType>
-Revision CompoundSyncable::RegisteredSyncable<SyncableType>::GetRevision() {
-  return member_->GetRevision();
-}
-
-template <typename SyncableType>
-void CompoundSyncable::RegisteredSyncable<SyncableType>::CreateChangeset(
-    Revision from,
-    google::protobuf::io::CodedOutputStream* output_stream) const {
-  std::unique_ptr<typename SyncableType::Changeset> changeset =
-      member_->CreateChangeset(from);
-  changeset->Serialize(output_stream);
-}
-
-template <typename SyncableType>
-void CompoundSyncable::RegisteredSyncable<SyncableType>::SetLocalUpdateCallback(
-    const base::Closure& local_update_callback) {
-  member_->SetLocalUpdateCallback(local_update_callback);
-}
-
-template <typename SyncableType>
-void CompoundSyncable::RegisteredSyncable<SyncableType>::ReleaseBefore(
-    Revision revision) {
-  member_->ReleaseBefore(revision);
-}
-
-template <typename SyncableType, typename... ConstructorArgs>
-CompoundSyncable::RegisteredSyncable<SyncableType>
-CompoundSyncable::CreateAndRegister(ConstructorArgs... args) {
-  RegisteredSyncable<SyncableType> new_member(
-      base::MakeUnique<SyncableType>(std::forward<ConstructorArgs>(args)...));
-  members_.push_back(&new_member);
-  return new_member;
-}
-
-// Stores the serialized changesets of all CompoundSyncable members.
-struct BLIMP_HELIUM_EXPORT CompoundChangeset : public SerializableStruct {
- public:
-  CompoundChangeset();
-  ~CompoundChangeset() override;
-
-  // Convenience function for parsing a serialized changeset as Changeset.
-  template <typename ChangesetType>
-  ChangesetType ParseForTest(int index) const;
-
-  // Sparse representation of serialized changed fields, indexed by their
-  // 0-based field index.
-  Field<std::map<int32_t, std::string>> compound_changesets;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CompoundChangeset);
-};
-
-template <typename ChangesetType>
-ChangesetType CompoundChangeset::ParseForTest(int index) const {
-  DCHECK(base::ContainsKey(compound_changesets, index));
-
-  google::protobuf::io::ArrayInputStream raw_input_stream(
-      compound_changesets().at(index).data(),
-      compound_changesets().at(index).size());
-  google::protobuf::io::CodedInputStream input_stream(&raw_input_stream);
-
-  ChangesetType output;
-  CHECK(output.Parse(input_stream));
-  return output;
-}
-
-}  // namespace helium
-}  // namespace blimp
-
-#endif  // BLIMP_HELIUM_COMPOUND_SYNCABLE_H_