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authorKaren Arutyunov <karen@codesynthesis.com>2017-04-29 23:55:46 +0300
committerKaren Arutyunov <karen@codesynthesis.com>2017-04-30 23:57:17 +0300
commit8f3d3956b1e837c726859eb8bbe19dad79c54a42 (patch)
tree81ded52db212b12c7f685165702cce90aa0233cf /libbrep/database-lock.hxx
parentea60a6df471706a0eeb5ff1f774d69abe89e4bc9 (diff)
Add hxx extension for headers and lib prefix for library dirs
Diffstat (limited to 'libbrep/database-lock.hxx')
-rw-r--r--libbrep/database-lock.hxx43
1 files changed, 43 insertions, 0 deletions
diff --git a/libbrep/database-lock.hxx b/libbrep/database-lock.hxx
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+// file : libbrep/database-lock.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef LIBBREP_DATABASE_LOCK_HXX
+#define LIBBREP_DATABASE_LOCK_HXX
+
+#include <odb/pgsql/forward.hxx> // database, transaction
+#include <odb/pgsql/connection.hxx>
+
+#include <libbrep/types.hxx>
+#include <libbrep/utility.hxx>
+
+namespace brep
+{
+ struct database_locked: std::exception
+ {
+ virtual char const*
+ what () const throw () {return "database locked";}
+ };
+
+ // Try to "lock" the PostgreSQL database in the constructor and release the
+ // lock in the destructor. Throw database_locked if the database is already
+ // locked by someone else. May also throw odb::pgsql::database_exception.
+ //
+ // This mechanism is used by the brep loader and schema migration tool to
+ // make sure they don't step on each others toes.
+ //
+ // Note: movable but not copyable.
+ //
+ class database_lock
+ {
+ public:
+ explicit
+ database_lock (odb::pgsql::database&);
+
+ private:
+ odb::pgsql::connection_ptr connection_;
+ unique_ptr<odb::pgsql::transaction> transaction_;
+ };
+}
+
+#endif // LIBBREP_DATABASE_LOCK_HXX