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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <cstdint>
#include <vector>
namespace proton {
/** Interface for tracking lids in the feed pipeline.
* A token is created with produce(lid).
* Once the token goes out of scope the lid is then consumed.
* This is used to track which lids are inflight in the feed pipeline.
*/
class IPendingLidTracker {
public:
class Token {
public:
Token();
Token(uint32_t lid, IPendingLidTracker & tracker);
Token(const Token &) = delete;
Token & operator = (const Token &) = delete;
Token & operator = (Token &&) = delete;
Token(Token && rhs) noexcept
: _tracker(rhs._tracker),
_lid(rhs._lid)
{
rhs._tracker = nullptr;
}
~Token();
private:
IPendingLidTracker * _tracker;
uint32_t _lid;
};
virtual ~IPendingLidTracker() = default;
virtual Token produce(uint32_t lid) = 0;
private:
virtual void consume(uint32_t lid) = 0;
};
/**
* This is an interface for checking/waiting the state of a lid in the feed pipeline
* The lid might need a commit (NEED_COMMIT), but if visibility-delay is zero it will go directly to WAITING
* as no explicit commit is needed.
* After a commit has been started the lid is transferred to WAITING.
* Once the commit has gone through the lid is in state COMPLETED.
*/
class ILidCommitState {
public:
enum class State {NEED_COMMIT, WAITING, COMPLETED};
using LidList = std::vector<uint32_t>;
virtual ~ILidCommitState() = default;
State getState(uint32_t lid) const { return waitState(State::NEED_COMMIT, lid); }
State getState(const LidList & lids) const { return waitState(State::NEED_COMMIT, lids); }
void waitComplete(uint32_t lid) const;
void waitComplete(const LidList & lids) const;
private:
virtual State waitState(State state, uint32_t lid) const = 0;
virtual State waitState(State state, const LidList & lids) const = 0;
};
}
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