89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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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 specific language governing permissions and
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// limitations under the License.
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#include <memory>
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#include <utility>
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#include "absl/memory/memory.h"
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#include "mediapipe/framework/executor.h"
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#include "mediapipe/framework/port/gmock.h"
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#include "mediapipe/framework/port/gtest.h"
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#include "mediapipe/framework/port/threadpool.h"
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// IMPORTANT: DO NOT add "namespace mediapipe" to this file.
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// Leave this file outside the mediapipe namespace to emulate how MediaPipe
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// clients implement and use a mediapipe::Executor subclass.
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namespace {
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// NOTE: If we need to update this class, that means there is a
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// backward-incompatible change in the MediaPipe API and MediaPipe clients also
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// need to update their mediapipe::Executor subclasses.
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class MyExecutor : public mediapipe::Executor {
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public:
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MyExecutor();
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~MyExecutor() override;
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// To verify a mediapipe::Executor subclass outside the mediapipe namespace
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// can override any method, override every method in the mediapipe::Executor
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// interface.
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void AddTask(mediapipe::TaskQueue* task_queue) override;
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void Schedule(std::function<void()> task) override;
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private:
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std::unique_ptr<mediapipe::ThreadPool> thread_pool_;
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};
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MyExecutor::MyExecutor() {
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thread_pool_ = absl::make_unique<mediapipe::ThreadPool>("my_executor", 1);
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thread_pool_->StartWorkers();
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}
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MyExecutor::~MyExecutor() { thread_pool_.reset(nullptr); }
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void MyExecutor::AddTask(mediapipe::TaskQueue* task_queue) {
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thread_pool_->Schedule([task_queue] { task_queue->RunNextTask(); });
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}
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void MyExecutor::Schedule(std::function<void()> task) {
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thread_pool_->Schedule(std::move(task));
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}
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class NoOpTaskQueue : public mediapipe::TaskQueue {
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public:
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// Returns the number of times RunNextTask() was called.
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int call_count() const { return call_count_; }
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private:
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void RunNextTask() override { ++call_count_; }
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int call_count_ = 0;
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};
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TEST(ExecutorTest, MyExecutor) {
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NoOpTaskQueue task_queue;
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std::shared_ptr<MyExecutor> executor(new MyExecutor);
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int counter = 0;
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executor->AddTask(&task_queue);
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executor->Schedule([&counter] { ++counter; });
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executor->AddTask(&task_queue);
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executor->Schedule([&counter] { ++counter; });
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executor->AddTask(&task_queue);
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executor = nullptr;
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EXPECT_EQ(3, task_queue.call_count());
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EXPECT_EQ(2, counter);
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}
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} // namespace
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