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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
#pragma once
#include <memory>
#include <mutex>
#include <vector>
#include "common/async/yield_context.h"
#include "rgw_realm_reloader.h"
#include "rgw_sal_fwd.h"
class RGWPeriod;
// RGWRealmNotify payload for push coordination
using RGWZonesNeedPeriod = RGWPeriod;
/**
* RGWPeriodPusher coordinates with other nodes via the realm watcher to manage
* the responsibility for pushing period updates to other zones or zonegroups.
*/
class RGWPeriodPusher final : public RGWRealmWatcher::Watcher,
public RGWRealmReloader::Pauser {
public:
explicit RGWPeriodPusher(const DoutPrefixProvider *dpp, rgw::sal::Driver* driver, optional_yield y);
~RGWPeriodPusher() override;
/// respond to realm notifications by pushing new periods to other zones
void handle_notify(RGWRealmNotify type, bufferlist::const_iterator& p) override;
/// avoid accessing RGWRados while dynamic reconfiguration is in progress.
/// notifications will be enqueued until resume()
void pause() override;
/// continue processing notifications with a new RGWRados instance
void resume(rgw::sal::Driver* driver) override;
private:
void handle_notify(RGWZonesNeedPeriod&& period);
CephContext *const cct;
rgw::sal::Driver* driver;
std::mutex mutex;
epoch_t realm_epoch{0}; //< the current realm epoch being sent
epoch_t period_epoch{0}; //< the current period epoch being sent
/// while paused for reconfiguration, we need to queue up notifications
std::vector<RGWZonesNeedPeriod> pending_periods;
class CRThread; //< contains thread, coroutine manager, http manager
std::unique_ptr<CRThread> cr_thread; //< thread to run the push coroutines
};
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