33 lines
895 B
C++
33 lines
895 B
C++
#pragma once
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#include "stream.h"
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namespace firesse {
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// Track live streams
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// O(1) for Add(), Remove(), and Freshen()
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// Manages this by only supporting insertion of the freshest element,
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// and by requiring an iterator for removal.
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// Avoids allocation and folds in iterators by using an intrusive list
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// inside Stream.
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class Index {
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public:
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void Add(Stream* stream);
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void Remove(Stream* stream);
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void Freshen(Stream* stream);
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// Returns time to sleep until next stalest, or min_stale if none
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// Only calls callback if stalest is at least min_stale
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// Handles all locking and marks Stream as fresh after callback
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std::chrono::nanoseconds WithStalest(
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std::function<void(Stream*)> callback,
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const std::chrono::nanoseconds& min_stale);
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private:
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std::recursive_mutex mu_;
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Stream* freshest_ = nullptr;
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Stream* stalest_ = nullptr;
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};
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} // namespace firesse
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