initial code repo

[stor4nfv.git] / src / ceph / src / mon / QuorumService.h

diff --git a/src/ceph/src/mon/QuorumService.h b/src/ceph/src/mon/QuorumService.h
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+++ b/src/ceph/src/mon/QuorumService.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Inktank, Inc
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+#ifndef CEPH_MON_QUORUM_SERVICE_H
+#define CEPH_MON_QUORUM_SERVICE_H
+
+#include <errno.h>
+
+#include "include/types.h"
+#include "include/Context.h"
+#include "common/RefCountedObj.h"
+#include "common/config.h"
+
+#include "mon/Monitor.h"
+
+class QuorumService
+{
+  Context *tick_event = nullptr;
+  double tick_period;
+
+public:
+  enum {
+    SERVICE_HEALTH                   = 0x01,
+    SERVICE_TIMECHECK                = 0x02,
+    SERVICE_CONFIG_KEY               = 0x03,
+  };
+
+protected:
+  Monitor *mon;
+  epoch_t epoch;
+
+  QuorumService(Monitor *m) :
+    tick_period(g_conf->mon_tick_interval),
+    mon(m),
+    epoch(0)
+  {
+  }
+
+  void cancel_tick() {
+    if (tick_event)
+      mon->timer.cancel_event(tick_event);
+    tick_event = NULL;
+  }
+
+  void start_tick() {
+    generic_dout(10) << __func__ << dendl;
+
+    cancel_tick();
+    if (tick_period <= 0)
+      return;
+
+    tick_event = new C_MonContext(mon, [this](int r) {
+       if (r < 0)
+         return;
+       tick();
+      });
+    mon->timer.add_event_after(tick_period, tick_event);
+  }
+
+  void set_update_period(double t) {
+    tick_period = t;
+  }
+
+  bool in_quorum() {
+    return (mon->is_leader() || mon->is_peon());
+  }
+
+  virtual bool service_dispatch(MonOpRequestRef op) = 0;
+  virtual void service_tick() = 0;
+  virtual void service_shutdown() = 0;
+
+  virtual void start_epoch() = 0;
+  virtual void finish_epoch() = 0;
+  virtual void cleanup() = 0;
+
+public:
+  virtual ~QuorumService() { }
+
+  void start(epoch_t new_epoch) {
+    epoch = new_epoch;
+    start_epoch();
+  }
+
+  void finish() {
+    generic_dout(20) << "QuorumService::finish" << dendl;
+    finish_epoch();
+  }
+
+  epoch_t get_epoch() const {
+    return epoch;
+  }
+
+  bool dispatch(MonOpRequestRef op) {
+    return service_dispatch(op);
+  }
+
+  void tick() {
+    service_tick();
+    start_tick();
+  }
+
+  void shutdown() {
+    generic_dout(0) << "quorum service shutdown" << dendl;
+    cancel_tick();
+    service_shutdown();
+  }
+
+  virtual void init() { }
+
+  virtual void get_health(list<pair<health_status_t,string> >& summary,
+                          list<pair<health_status_t,string> > *detail) = 0;
+  virtual int get_type() = 0;
+  virtual string get_name() const = 0;
+
+};
+
+#endif /* CEPH_MON_QUORUM_SERVICE_H */