components/persistent_cache/mojom/persistent_cache.mojom

// 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.

module persistent_cache.mojom;

import "mojo/public/mojom/base/file.mojom";
import "mojo/public/mojom/base/shared_memory.mojom";

// The handles needed to open a PersistentCache instance for read-only access.
struct PendingReadOnlyBackend {
  mojo_base.mojom.ReadOnlyFile db_file;
  mojo_base.mojom.ReadOnlyFile journal_file;

  // Read-only views are only possible for backends supporting multiple
  // connections, so the shared lock is mandatory.
  mojo_base.mojom.UnsafeSharedMemoryRegion shared_lock;
};

// The handles needed to open a PersistentCache instance for read-write access.
struct PendingReadWriteBackend {
  mojo_base.mojom.File db_file;
  mojo_base.mojom.File journal_file;

  // An optional write-ahead log file, specified only if this backend uses a
  // write-ahead log rather than a rollback journal.
  mojo_base.mojom.File? wal_file;

  // The shared lock is present if this backend supports multiple connections.
  mojo_base.mojom.UnsafeSharedMemoryRegion? shared_lock;
};