1 files changed, 62 insertions, 0 deletions
diff --git a/ACE/apps/JAWS/clients/Caching/ID_Generator.h b/ACE/apps/JAWS/clients/Caching/ID_Generator.h
new file mode 100644
index 00000000000..73c78fc5506
--- /dev/null
+++ b/ACE/apps/JAWS/clients/Caching/ID_Generator.h
@@ -0,0 +1,62 @@
+/* -*- C++ -*- */
+
+// $Id$
+
+// ============================================================================
+//
+// = LIBRARY
+//    none
+//
+// = FILENAME
+//    ID_Generator.h
+//
+// = AUTHOR
+//    Nanbor Wang
+//
+// ============================================================================
+
+#ifndef ACE_ID_GENERATOR_H
+#define ACE_ID_GENERATOR_h
+
+#include "ace/config-all.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#define ACE_OFFER_ID_LENGTH 21
+
+class ACE_ID_Generator
+  // = TITLE
+  //     An unique ID generator.
+  //
+  // = DESCRIPTION
+
+  //     Generate an offer ID according to current time and avoid
+  //     duplicate ID.  It guarantees ID uniqueness within a process,
+  //     i.e. no two threads may get the same ID string.  Using a
+  //     similar method like the backery algorithm.
+{
+public:
+  static char *get_new_id (char *id);
+  // allocate a new ID string and point <id> to it.
+
+private:
+  static void get_serial_id (time_t &t, size_t &s);
+  // Atomically get info required to generate an offer ID.
+
+  static ACE_SYNCH_MUTEX *get_lock (void);
+  // Get the lock instance.
+
+  static time_t last_time_;
+  // Record the time last offer ID generated.
+
+  static size_t last_number_;
+  // Record serial number of last offer ID with same
+  // generation time.
+
+  static ACE_SYNCH_MUTEX *lock_;
+  // mutex to access private member.
+};
+
+#endif /* ACE_ID_GENERATOR_H */