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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "i_gid_to_lid_change_handler.h"
#include "pending_gid_to_lid_change.h"
#include <vespa/vespalib/stllike/hash_map.h>
#include <vector>
#include <mutex>
namespace searchcorespi { namespace index { struct IThreadService; } }
namespace proton {
/*
* Class for registering listeners that get notification when
* gid to lid mapping changes. Also handles notifications which have
* to be executed by master thread service.
*/
class GidToLidChangeHandler : public std::enable_shared_from_this<GidToLidChangeHandler>,
public IGidToLidChangeHandler
{
using lock_guard = std::lock_guard<std::mutex>;
using Listeners = std::vector<std::unique_ptr<IGidToLidChangeListener>>;
struct PendingRemoveEntry {
SerialNum removeSerialNum;
SerialNum putSerialNum;
uint32_t refCount;
PendingRemoveEntry(SerialNum removeSerialNum_)
: removeSerialNum(removeSerialNum_),
putSerialNum(0),
refCount(1)
{
}
PendingRemoveEntry()
: PendingRemoveEntry(0)
{
}
};
std::mutex _lock;
Listeners _listeners;
bool _closed;
vespalib::hash_map<GlobalId, PendingRemoveEntry, GlobalId::hash> _pendingRemove;
std::vector<PendingGidToLidChange> _pending_changes;
void notifyPutDone(IDestructorCallbackSP context, GlobalId gid, uint32_t lid);
void notifyRemove(IDestructorCallbackSP context, GlobalId gid);
public:
GidToLidChangeHandler();
~GidToLidChangeHandler() override;
void notifyPut(IDestructorCallbackSP context, GlobalId gid, uint32_t lid, SerialNum serial_num) override;
void notifyPutDone(IDestructorCallbackSP context, GlobalId gid, uint32_t lid, SerialNum serialNum);
void notifyRemoves(IDestructorCallbackSP context, const std::vector<GlobalId> & gids, SerialNum serialNum) override;
void notifyRemoveDone(GlobalId gid, SerialNum serialNum);
std::unique_ptr<IPendingGidToLidChanges> grab_pending_changes() override;
/**
* Close handler, further notifications are blocked.
*/
void close();
void addListener(std::unique_ptr<IGidToLidChangeListener> listener) override;
void removeListeners(const vespalib::string &docTypeName, const std::set<vespalib::string> &keepNames) override;
};
} // namespace proton
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