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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 "ipendinglidtracker.h"
#include <vespa/vespalib/stllike/hash_map.h>
#include <mutex>
#include <condition_variable>
namespace proton {
/**
* Base class for doing 2 phased lid tracking. The first phase is from when the feed operation
* is in progress and lasts until the OperationDoneContext goes out of scope. This might include commit
* when visibility-delay is zero.
* When a commit is started a snapshot containing all lids in state NEED_COMMIT are taken,
* while also moving the lids to WAITING. Once the snapshot goes out of scope when the commit is complete,
* it will cleanup and move all lids from WAITING to COMPLETE.
*/
class PendingLidTrackerBase : public IPendingLidTracker,
public ILidCommitState
{
public:
~PendingLidTrackerBase();
struct Payload {
virtual ~Payload() = default;
};
using Snapshot = std::unique_ptr<Payload>;
virtual Snapshot produceSnapshot() = 0;
State waitState(State state, uint32_t lid) const override;
State waitState(State state, const LidList & lids) const override;
protected:
using MonitorGuard = std::unique_lock<std::mutex>;
PendingLidTrackerBase();
virtual State waitFor(MonitorGuard & guard, State state, uint32_t lid) const = 0;
MonitorGuard getGuard() { return MonitorGuard(_mutex); }
mutable std::mutex _mutex;
mutable std::condition_variable _cond;
};
/**
* Use for tracking lids when visibility-delay is zero and commit is implicit.
* In this case lids go directly to WAITING and the second phase is a noop.
*/
class PendingLidTracker : public PendingLidTrackerBase
{
public:
PendingLidTracker();
~PendingLidTracker() override;
Token produce(uint32_t lid) override;
Snapshot produceSnapshot() override;
private:
void consume(uint32_t lid) override;
State waitFor(MonitorGuard & guard, State state, uint32_t lid) const override;
vespalib::hash_map<uint32_t, uint32_t> _pending;
};
}
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