class: add a class monitor for the paxos services

1 files changed, 69 insertions, 0 deletions

diff --git a/src/mon/ClassMonitor.h b/src/mon/ClassMonitor.h
new file mode 100644
index 00000000000..f9b972d213e
--- /dev/null
+++ b/src/mon/ClassMonitor.h
@@ -0,0 +1,69 @@
+// -*- 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) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * 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 __CLASSMONITOR_H
+#define __CLASSMONITOR_H
+
+#include <map>
+#include <set>
+using namespace std;
+
+#include "include/types.h"
+#include "msg/Messenger.h"
+#include "PaxosService.h"
+
+#include "include/ClassEntry.h"
+
+class MMonCommand;
+class MClass;
+
+class ClassMonitor : public PaxosService {
+private:
+  multimap<utime_t,ClassLibraryIncremental> pending_class;
+  ClassList pending_list, list;
+
+  void create_initial(bufferlist& bl);
+  bool update_from_paxos();
+  void create_pending();  // prepare a new pending
+  void encode_pending(bufferlist &bl);  // propose pending update to peers
+
+  void committed();
+
+  bool preprocess_query(Message *m);  // true if processed.
+  bool prepare_update(Message *m);
+
+  bool preprocess_class(MClass *m);
+  bool prepare_class(MClass *m);
+  void _updated_class(MClass *m, entity_inst_t who);
+
+  struct C_Class : public Context {
+    ClassMonitor *classmon;
+    MClass *ack;
+    entity_inst_t who;
+    C_Class(ClassMonitor *p, MClass *a, entity_inst_t w) : classmon(p), ack(a), who(w) {}
+    void finish(int r) {
+      classmon->_updated_class(ack, who);
+    }    
+  };
+
+  bool preprocess_command(MMonCommand *m);
+  bool prepare_command(MMonCommand *m);
+
+ public:
+  ClassMonitor(Monitor *mn, Paxos *p) : PaxosService(mn, p) { }
+  
+  void tick();  // check state, take actions
+};
+
+#endif