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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PERSISTENT_CACHE_PENDING_BACKEND_H_
#define COMPONENTS_PERSISTENT_CACHE_PENDING_BACKEND_H_
#include "base/component_export.h"
#include "base/files/file.h"
#include "base/memory/unsafe_shared_memory_region.h"
namespace persistent_cache {
// The state required to connect to a backend. Instances are created via a
// BackendStorage and are bound by a PersistentCache to establish a connection.
struct COMPONENT_EXPORT(PERSISTENT_CACHE) PendingBackend {
PendingBackend();
PendingBackend(PendingBackend&&);
PendingBackend& operator=(PendingBackend&&);
~PendingBackend();
struct COMPONENT_EXPORT(PERSISTENT_CACHE) SqliteData {
SqliteData();
SqliteData(SqliteData&&);
SqliteData& operator=(SqliteData&&);
~SqliteData();
base::File db_file;
base::File journal_file;
// An optional write-ahead log file, specified only if this backend uses a
// write-ahead log rather than a rollback journal.
base::File wal_file;
// An optional read-write region of memory shared by all processes accessing
// `db_file_` that holds the locking state for the database. Locks are not
// released upon abnormal process termination.
base::UnsafeSharedMemoryRegion shared_lock;
};
// The data specific to the SQLite backend. If there is ever occasion to have
// more than one type, use std::variant<> to hold the data for each.
SqliteData sqlite_data;
// False if this backend is read-only, true if read/write.
bool read_write = false;
};
} // namespace persistent_cache
#endif // COMPONENTS_PERSISTENT_CACHE_PENDING_BACKEND_H_
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