initial code repo

[stor4nfv.git] / src / ceph / src / osd / ClassHandler.h

diff --git a/src/ceph/src/osd/ClassHandler.h b/src/ceph/src/osd/ClassHandler.h
new file mode 100644 (file)
index 0000000..0e1991a
--- /dev/null
+++ b/src/ceph/src/osd/ClassHandler.h
@@ -0,0 +1,130 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+#ifndef CEPH_CLASSHANDLER_H
+#define CEPH_CLASSHANDLER_H
+
+#include "include/types.h"
+#include "objclass/objclass.h"
+#include "common/Mutex.h"
+
+//forward declaration
+class CephContext;
+
+class ClassHandler
+{
+public:
+  CephContext *cct;
+
+  struct ClassData;
+
+  struct ClassMethod {
+    struct ClassHandler::ClassData *cls;
+    string name;
+    int flags;
+    cls_method_call_t func;
+    cls_method_cxx_call_t cxx_func;
+
+    int exec(cls_method_context_t ctx, bufferlist& indata, bufferlist& outdata);
+    void unregister();
+
+    int get_flags() {
+      Mutex::Locker l(cls->handler->mutex);
+      return flags;
+    }
+
+    ClassMethod() : cls(0), flags(0), func(0), cxx_func(0) {}
+  };
+
+  struct ClassFilter {
+    struct ClassHandler::ClassData *cls;
+    std::string name;
+    cls_cxx_filter_factory_t fn;
+
+    void unregister();
+
+    ClassFilter() : fn(0)
+    {}
+  };
+
+  struct ClassData {
+    enum Status { 
+      CLASS_UNKNOWN,
+      CLASS_MISSING,         // missing
+      CLASS_MISSING_DEPS,    // missing dependencies
+      CLASS_INITIALIZING,    // calling init() right now
+      CLASS_OPEN,            // initialized, usable
+    } status;
+
+    string name;
+    ClassHandler *handler;
+    void *handle;
+
+    bool whitelisted;
+
+    map<string, ClassMethod> methods_map;
+    map<string, ClassFilter> filters_map;
+
+    set<ClassData *> dependencies;         /* our dependencies */
+    set<ClassData *> missing_dependencies; /* only missing dependencies */
+
+    ClassMethod *_get_method(const char *mname);
+
+    ClassData() : status(CLASS_UNKNOWN), 
+                 handler(NULL),
+                 handle(NULL) {}
+    ~ClassData() { }
+
+    ClassMethod *register_method(const char *mname, int flags, cls_method_call_t func);
+    ClassMethod *register_cxx_method(const char *mname, int flags, cls_method_cxx_call_t func);
+    void unregister_method(ClassMethod *method);
+
+    ClassFilter *register_cxx_filter(
+        const std::string &filter_name,
+        cls_cxx_filter_factory_t fn);
+    void unregister_filter(ClassFilter *method);
+
+    ClassMethod *get_method(const char *mname) {
+      Mutex::Locker l(handler->mutex);
+      return _get_method(mname);
+    }
+    int get_method_flags(const char *mname);
+
+    ClassFilter *get_filter(const std::string &filter_name)
+    {
+      Mutex::Locker l(handler->mutex);
+      std::map<std::string, ClassFilter>::iterator i = filters_map.find(filter_name);
+      if (i == filters_map.end()) {
+        return NULL;
+      } else {
+        return &(i->second);
+      }
+    }
+  };
+
+private:
+  map<string, ClassData> classes;
+
+  ClassData *_get_class(const string& cname, bool check_allowed);
+  int _load_class(ClassData *cls);
+
+  static bool in_class_list(const std::string& cname,
+      const std::string& list);
+
+public:
+  Mutex mutex;
+
+  explicit ClassHandler(CephContext *cct_) : cct(cct_), mutex("ClassHandler") {}
+
+  int open_all_classes();
+
+  void add_embedded_class(const string& cname);
+  int open_class(const string& cname, ClassData **pcls);
+  
+  ClassData *register_class(const char *cname);
+  void unregister_class(ClassData *cls);
+
+  void shutdown();
+};
+
+
+#endif