blob: eb35cb921bf644835e1e1e851cf252efad706aba [file] [log] [blame]
// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <lib/fit/function.h>
#include <lib/fxl/memory/ref_ptr.h>
#include <lib/timekeeper/clock.h>
#include "peridot/bin/ledger/storage/public/commit.h"
#include "peridot/bin/ledger/storage/public/page_storage.h"
namespace storage {
class CommitImpl : public Commit {
// Passkey idiom to restrict access to the constructor to static factories.
class Token;
class SharedStorageBytes;
// Creates a new |CommitImpl| object with the given contents.
CommitImpl(Token token, PageStorage* page_storage, CommitId id,
zx::time_utc timestamp, uint64_t generation,
ObjectIdentifier root_node_identifier,
std::vector<CommitIdView> parent_ids,
fxl::RefPtr<SharedStorageBytes> storage_bytes);
~CommitImpl() override;
// Factory method for creating a |CommitImpl| object given its storage
// representation. If the format is incorrect, |nullptr| will be returned.
static Status FromStorageBytes(PageStorage* page_storage, CommitId id,
std::string storage_bytes,
std::unique_ptr<const Commit>* commit);
static std::unique_ptr<const Commit> FromContentAndParents(
timekeeper::Clock* clock, PageStorage* page_storage,
ObjectIdentifier root_node_identifier,
std::vector<std::unique_ptr<const Commit>> parent_commits);
// Factory method for creating an empty |CommitImpl| object, i.e. without
// parents and with empty contents.
static void Empty(
PageStorage* page_storage,
fit::function<void(Status, std::unique_ptr<const Commit>)> callback);
// Commit:
std::unique_ptr<const Commit> Clone() const override;
const CommitId& GetId() const override;
std::vector<CommitIdView> GetParentIds() const override;
zx::time_utc GetTimestamp() const override;
uint64_t GetGeneration() const override;
ObjectIdentifier GetRootIdentifier() const override;
fxl::StringView GetStorageBytes() const override;
class Token {
Token() {}
friend CommitImpl;
PageStorage* page_storage_;
const CommitId id_;
const zx::time_utc timestamp_;
const uint64_t generation_;
const ObjectIdentifier root_node_identifier_;
const std::vector<CommitIdView> parent_ids_;
const fxl::RefPtr<SharedStorageBytes> storage_bytes_;
} // namespace storage