You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.2 KiB
84 lines
2.2 KiB
// Copyright (C) 2018 The Android Open Source Project
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#include "base/Optional.h"
|
|
#include "base/Lock.h"
|
|
|
|
#include <functional>
|
|
#include <unordered_map>
|
|
|
|
namespace android {
|
|
namespace base {
|
|
|
|
// Static map class for use with LazyInstance or in global structures
|
|
// as a process-wide registry of something. Safe for concurrent accress.
|
|
template <class K, class V>
|
|
class StaticMap {
|
|
public:
|
|
StaticMap() = default;
|
|
|
|
void set(const K& key, const V& value) {
|
|
AutoLock lock(mLock);
|
|
mItems.emplace(key, value);
|
|
}
|
|
|
|
void erase(const K& key) {
|
|
AutoLock lock(mLock);
|
|
mItems.erase(key);
|
|
}
|
|
|
|
bool isPresent(const K& key) const {
|
|
AutoLock lock(mLock);
|
|
auto it = mItems.find(key);
|
|
return it != mItems.end();
|
|
}
|
|
|
|
android::base::Optional<V> get(const K& key) const {
|
|
AutoLock lock(mLock);
|
|
auto it = mItems.find(key);
|
|
if (it == mItems.end()) {
|
|
return android::base::kNullopt;
|
|
}
|
|
return it->second;
|
|
}
|
|
|
|
using ErasePredicate = std::function<bool(K, V)>;
|
|
|
|
void eraseIf(ErasePredicate p) {
|
|
AutoLock lock(mLock);
|
|
auto it = mItems.begin();
|
|
for (; it != mItems.end();) {
|
|
if (p(it->first, it->second)) {
|
|
it = mItems.erase(it);
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
}
|
|
|
|
void clear() {
|
|
AutoLock lock(mLock);
|
|
mItems.clear();
|
|
}
|
|
private:
|
|
using AutoLock = android::base::AutoLock;
|
|
using Lock = android::base::Lock;
|
|
|
|
mutable android::base::Lock mLock;
|
|
std::unordered_map<K, V> mItems;
|
|
};
|
|
|
|
} // namespace base
|
|
} // namespace android
|