1 /*
2  * Copyright (C) 2020 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 ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BURST_H
18 #define ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BURST_H
19 
20 #include <android-base/thread_annotations.h>
21 #include <nnapi/IBurst.h>
22 #include <nnapi/Result.h>
23 #include <nnapi/Types.h>
24 
25 #include <functional>
26 #include <memory>
27 #include <mutex>
28 #include <optional>
29 #include <utility>
30 
31 namespace android::hardware::neuralnetworks::utils {
32 
33 class ResilientBurst final : public nn::IBurst,
34                              public std::enable_shared_from_this<ResilientBurst> {
35     struct PrivateConstructorTag {};
36 
37   public:
38     using Factory = std::function<nn::GeneralResult<nn::SharedBurst>()>;
39 
40     static nn::GeneralResult<std::shared_ptr<const ResilientBurst>> create(Factory makeBurst);
41 
42     ResilientBurst(PrivateConstructorTag tag, Factory makeBurst, nn::SharedBurst burst);
43 
44     nn::SharedBurst getBurst() const;
45     nn::GeneralResult<nn::SharedBurst> recover(const nn::IBurst* failingBurst) const;
46 
47     OptionalCacheHold cacheMemory(const nn::SharedMemory& memory) const override;
48 
49     nn::ExecutionResult<std::pair<std::vector<nn::OutputShape>, nn::Timing>> execute(
50             const nn::Request& request, nn::MeasureTiming measure,
51             const nn::OptionalTimePoint& deadline,
52             const nn::OptionalDuration& loopTimeoutDuration) const override;
53 
54     nn::GeneralResult<nn::SharedExecution> createReusableExecution(
55             const nn::Request& request, nn::MeasureTiming measure,
56             const nn::OptionalDuration& loopTimeoutDuration) const override;
57 
58   private:
59     bool isValidInternal() const EXCLUDES(mMutex);
60     nn::GeneralResult<nn::SharedExecution> createReusableExecutionInternal(
61             const nn::Request& request, nn::MeasureTiming measure,
62             const nn::OptionalDuration& loopTimeoutDuration) const;
63 
64     const Factory kMakeBurst;
65     mutable std::mutex mMutex;
66     mutable nn::SharedBurst mBurst GUARDED_BY(mMutex);
67 };
68 
69 }  // namespace android::hardware::neuralnetworks::utils
70 
71 #endif  // ANDROID_HARDWARE_INTERFACES_NEURALNETWORKS_UTILS_COMMON_RESILIENT_BURST_H
72