X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fhbugs%2Ftutors%2Fhbugs_tutors_common.ml;h=8ffd4b7042e053f50227003c33f10b41dd6357df;hb=98c54cc2f059805350f56811eff8a41934a41460;hp=ca3de9fed48335036e6b384796e3ea414de817a1;hpb=1f9b11657c822cc762f808e0bfc5f5f2b4fb6ec7;p=helm.git

diff --git a/helm/hbugs/tutors/hbugs_tutors_common.ml b/helm/hbugs/tutors/hbugs_tutors_common.ml
index ca3de9fed..8ffd4b704 100644
--- a/helm/hbugs/tutors/hbugs_tutors_common.ml
+++ b/helm/hbugs/tutors/hbugs_tutors_common.ml
@@ -30,6 +30,7 @@ open Hbugs_types;;
 open Printf;;
 
 let broker_url = "localhost:49081/act";;
+let dump_environment_on_exit = false;;
 
 let init_tutor = Hbugs_id_generator.new_tutor_id;;
 
@@ -138,6 +139,7 @@ module type HbugsTutorDescription =
     val hint: hint
     val hint_type: hint_type
     val description: string
+    val environment_file: string
   end
 
 module BuildTutor (Dsc: HbugsTutorDescription) : HbugsTutor =
@@ -224,13 +226,34 @@ module BuildTutor (Dsc: HbugsTutorDescription) : HbugsTutor =
             (Exception ("parse_error", reason)))
           outchan
 
+    let restore_environment () =
+      let ic = open_in Dsc.environment_file in
+      prerr_endline "Restoring environment ...";
+      CicEnvironment.restore_from_channel
+        ~callback:(fun uri -> prerr_endline uri) ic;
+      prerr_endline "... done!";
+      close_in ic
+
+    let dump_environment () =
+      let oc = open_out Dsc.environment_file in
+      prerr_endline "Dumping environment ...";
+      CicEnvironment.dump_to_channel
+        ~callback:(fun uri -> prerr_endline uri) oc;
+      prerr_endline "... done!";
+      close_out oc
+
     let main () =
       try
         Sys.catch_break true;
-        at_exit (fun () -> unregister_from_broker my_own_id);
+        at_exit (fun () ->
+          if dump_environment_on_exit then
+            dump_environment ();
+          unregister_from_broker my_own_id);
         broker_id :=
           Some (register_to_broker
             my_own_id my_own_url Dsc.hint_type Dsc.description);
+        if Sys.file_exists Dsc.environment_file then
+          restore_environment ();
         Http_daemon.start'
           ~addr:my_own_addr ~port:my_own_port ~mode:`Thread callback
       with Sys.Break -> ()  (* exit nicely, invoking at_exit functions *)