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/*
* Copyright (C) 2017 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 specic language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_LIBPERFMGR_REQUESTGROUP_H_
#define ANDROID_LIBPERFMGR_REQUESTGROUP_H_
#include <chrono>
#include <map>
#include <string>
#include <utility>
namespace android {
namespace perfmgr {
using ReqTime = std::chrono::time_point<std::chrono::steady_clock>;
// The RequestGroup type represents the set of requests for a given value on a
// particular sysfs node, and the interface is simple: there is a function to
// add requests, a function to remove requests, and a function to check for the
// next expiration time if there is an outstanding request, and a function to
// check the requested value. There may only be one request per PowerHint, so
// the representation is simple: a map from PowerHint to the expiration time for
// that hint.
class RequestGroup {
public:
RequestGroup(std::string request_value) // NOLINT(runtime/explicit)
: request_value_(std::move(request_value)) {}
// Remove expired request in the map and return true when request_map_ is
// not empty, false when request_map_ is empty; also update expire_time with
// nearest timeout in request_map_ or std::chrono::milliseconds::max() when
// request_map_ is empty.
bool GetExpireTime(std::chrono::milliseconds* expire_time);
// Return the request value.
const std::string& GetRequestValue() const;
// Return true for adding request, false for extending expire time of
// existing active request on given hint_type.
bool AddRequest(const std::string& hint_type, ReqTime end_time);
// Return true for removing request, false if request is not active on given
// hint_type. If request exits and the new end_time is less than the active
// time, expire time will not be updated; also returns false.
bool RemoveRequest(const std::string& hint_type);
private:
const std::string request_value_;
std::map<std::string, ReqTime> request_map_;
};
} // namespace perfmgr
} // namespace android
#endif // ANDROID_LIBPERFMGR_REQUESTGROUP_H_
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