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// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:analyzer/src/dart/analysis/cache.dart';
import 'package:collection/collection.dart';
class CacheData {
final int id;
final List<int> bytes;
CacheData(, this.bytes);
/// Store of bytes associated with string keys and a hash.
/// Each key must be not longer than 100 characters and consist of only `[a-z]`,
/// `[0-9]`, `.` and `_` characters. The key cannot be an empty string, the
/// literal `.`, or contain the sequence `..`.
/// Note that associations are not guaranteed to be persistent. The value
/// associated with a key can change or become `null` at any point in time.
abstract class CiderByteStore {
/// Return the bytes associated with the errors for given [key] and
/// [signature].
/// Return `null` if the association does not exist.
CacheData? get(String key, List<int> signature);
/// Associate the given [bytes] with the [key] and [signature]. Return the
/// [CacheData].
CacheData putGet(String key, List<int> signature, List<int> bytes);
/// Used to decrement reference count for the given ids, if implemented.
void release(Iterable<int> ids);
class CiderByteStoreTestView {
int length = 0;
class CiderCachedByteStore implements CiderByteStore {
final Cache<String, CiderCacheEntry> _cache;
int idCounter = 0;
/// This field gets value only during testing.
CiderByteStoreTestView? testView;
CiderCachedByteStore(int maxCacheSize)
: _cache = Cache<String, CiderCacheEntry>(
maxCacheSize, (v) =>;
CacheData? get(String key, List<int> signature) {
var entry = _cache.get(key, () => null);
if (entry != null &&
const ListEquality<int>().equals(entry.signature, signature)) {
return null;
CacheData putGet(String key, List<int> signature, List<int> bytes) {
var entry = CiderCacheEntry(signature, CacheData(idCounter, bytes));
_cache.put(key, entry);
void release(Iterable<int> ids) {
// do nothing
class CiderCacheEntry {
final CacheData data;
final List<int> signature;