68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specic language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_LIBPERFMGR_REQUESTGROUP_H_
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#define ANDROID_LIBPERFMGR_REQUESTGROUP_H_
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#include <chrono>
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#include <map>
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#include <string>
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#include <utility>
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namespace android {
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namespace perfmgr {
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using ReqTime = std::chrono::time_point<std::chrono::steady_clock>;
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// The RequestGroup type represents the set of requests for a given value on a
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// particular sysfs node, and the interface is simple: there is a function to
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// add requests, a function to remove requests, and a function to check for the
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// next expiration time if there is an outstanding request, and a function to
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// check the requested value. There may only be one request per PowerHint, so
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// the representation is simple: a map from PowerHint to the expiration time for
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// that hint.
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class RequestGroup {
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public:
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RequestGroup(const std::string &request_value) // NOLINT(runtime/explicit)
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: request_value_(request_value) {}
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// Remove expired request in the map and return true when request_map_ is
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// not empty, false when request_map_ is empty; also update expire_time with
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// nearest timeout in request_map_ or std::chrono::milliseconds::max() when
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// request_map_ is empty.
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bool GetExpireTime(std::chrono::milliseconds* expire_time);
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// Return the request value.
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const std::string& GetRequestValue() const;
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// Return true for adding request, false for extending expire time of
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// existing active request on given hint_type.
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bool AddRequest(const std::string& hint_type, ReqTime end_time);
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// Return true for removing request, false if request is not active on given
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// hint_type. If request exits and the new end_time is less than the active
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// time, expire time will not be updated; also returns false.
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bool RemoveRequest(const std::string& hint_type);
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// Dump internal status to fd
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void DumpToFd(int fd, const std::string& prefix) const;
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private:
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const std::string request_value_;
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std::map<std::string, ReqTime> request_map_;
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};
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} // namespace perfmgr
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} // namespace android
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#endif // ANDROID_LIBPERFMGR_REQUESTGROUP_H_
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