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// Copyright 2022 The Chromium Authors.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_ANALYSIS_DEMO_REQUST_QUEUE_H_
#define CONTENT_ANALYSIS_DEMO_REQUST_QUEUE_H_
#include <condition_variable>
#include <memory>
#include <mutex>
#include <queue>
#include "content_analysis/sdk/analysis_agent.h"
// This class maintains a list of outstanding content analysis requests to
// process. Each request is encapsulated in one ContentAnalysisEvent.
// Requests are handled in FIFO order.
class RequestQueue {
public:
using Event = content_analysis::sdk::ContentAnalysisEvent;
RequestQueue() = default;
virtual ~RequestQueue() = default;
// Push a new content analysis event into the queue.
void push(std::unique_ptr<Event> event) {
std::lock_guard<std::mutex> lock(mutex_);
events_.push(std::move(event));
// Wake before leaving to prevent unpredicatable scheduling.
cv_.notify_one();
}
// Pop the next request from the queue, blocking if necessary until an event
// is available. Returns a nullptr if the queue will produce no more
// events.
std::unique_ptr<Event> pop() {
std::unique_lock<std::mutex> lock(mutex_);
while (!abort_ && events_.size() == 0)
cv_.wait(lock);
std::unique_ptr<Event> event;
if (!abort_) {
event = std::move(events_.front());
events_.pop();
}
return event;
}
// Marks the queue as aborted. pop() will now return nullptr.
void abort() {
std::lock_guard<std::mutex> lg(mutex_);
abort_ = true;
// Wake before leaving to prevent unpredicatable scheduling.
cv_.notify_all();
}
private:
std::queue<std::unique_ptr<Event>> events_;
std::mutex mutex_;
std::condition_variable cv_;
bool abort_ = false;
};
#endif // CONTENT_ANALYSIS_DEMO_REQUST_QUEUE_H_
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