1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef THROTTLER_H
18 #define THROTTLER_H
19 
20 #include <utils/RefBase.h>
21 
22 #include <unistd.h>
23 
24 namespace android {
25 namespace os {
26 namespace incidentd {
27 /**
28  * This is a size-based throttler which prevents incidentd to take more data.
29  */
30 class Throttler : public virtual android::RefBase {
31 public:
32     Throttler(size_t limit, int64_t refractoryPeriodMs);
33     ~Throttler();
34 
35     /**
36      * Asserts this before starting taking report.
37      */
38     bool shouldThrottle();
39 
40     void addReportSize(size_t reportByteSize);
41 
42     void dump(FILE* out);
43 
44 private:
45     const size_t mSizeLimit;
46     const int64_t mRefractoryPeriodMs;
47 
48     size_t mAccumulatedSize;
49     int64_t mLastRefractoryMs;
50 };
51 
52 }  // namespace incidentd
53 }  // namespace os
54 }  // namespace android
55 
56 #endif  // THROTTLER_H
57