src/Pure/System/session.scala
author wenzelm
Sat Sep 25 13:57:34 2010 +0200 (2010-09-25)
changeset 39698 625a3bc4417b
parent 39696 f4da0428dc78
child 39701 7c351c1c0624
permissions -rw-r--r--
tuned signature;
wenzelm@36676
     1
/*  Title:      Pure/System/session.scala
wenzelm@36676
     2
    Author:     Makarius
wenzelm@38221
     3
    Options:    :folding=explicit:collapseFolds=1:
wenzelm@36676
     4
wenzelm@36676
     5
Isabelle session, potentially with running prover.
wenzelm@36676
     6
*/
wenzelm@34777
     7
wenzelm@34871
     8
package isabelle
wenzelm@34777
     9
wenzelm@34777
    10
wenzelm@34820
    11
import scala.actors.TIMEOUT
wenzelm@38226
    12
import scala.actors.Actor
wenzelm@34777
    13
import scala.actors.Actor._
wenzelm@34777
    14
wenzelm@34815
    15
wenzelm@34791
    16
object Session
wenzelm@34791
    17
{
wenzelm@34813
    18
  /* events */
wenzelm@34813
    19
wenzelm@34791
    20
  case object Global_Settings
wenzelm@37849
    21
  case object Perspective
wenzelm@38849
    22
  case object Assignment
wenzelm@38360
    23
  case class Commands_Changed(set: Set[Command])
wenzelm@39630
    24
wenzelm@39630
    25
  sealed abstract class Phase
wenzelm@39630
    26
  case object Inactive extends Phase
wenzelm@39696
    27
  case object Startup extends Phase
wenzelm@39630
    28
  case object Ready extends Phase
wenzelm@39630
    29
  case object Shutdown extends Phase
wenzelm@34791
    30
}
wenzelm@34791
    31
wenzelm@34777
    32
wenzelm@34851
    33
class Session(system: Isabelle_System)
wenzelm@34777
    34
{
wenzelm@37849
    35
  /* real time parameters */  // FIXME properties or settings (!?)
wenzelm@37849
    36
wenzelm@37849
    37
  // user input (e.g. text edits, cursor movement)
wenzelm@37849
    38
  val input_delay = 300
wenzelm@37849
    39
wenzelm@37849
    40
  // prover output (markup, common messages)
wenzelm@37849
    41
  val output_delay = 100
wenzelm@37849
    42
wenzelm@37849
    43
  // GUI layout updates
wenzelm@37849
    44
  val update_delay = 500
wenzelm@37849
    45
wenzelm@37849
    46
wenzelm@34809
    47
  /* pervasive event buses */
wenzelm@34809
    48
wenzelm@39630
    49
  val phase_changed = new Event_Bus[(Session.Phase, Session.Phase)]
wenzelm@34809
    50
  val global_settings = new Event_Bus[Session.Global_Settings.type]
wenzelm@39588
    51
  val raw_messages = new Event_Bus[Isabelle_Process.Result]
wenzelm@38360
    52
  val commands_changed = new Event_Bus[Session.Commands_Changed]
wenzelm@37849
    53
  val perspective = new Event_Bus[Session.Perspective.type]
wenzelm@38849
    54
  val assignments = new Event_Bus[Session.Assignment.type]
wenzelm@34809
    55
wenzelm@34809
    56
wenzelm@34778
    57
  /* unique ids */
wenzelm@34778
    58
wenzelm@38363
    59
  private var id_count: Document.ID = 0
wenzelm@38419
    60
  def new_id(): Document.ID = synchronized {
wenzelm@38355
    61
    require(id_count > java.lang.Long.MIN_VALUE)
wenzelm@38355
    62
    id_count -= 1
wenzelm@38355
    63
    id_count
wenzelm@38355
    64
  }
wenzelm@34778
    65
wenzelm@34778
    66
wenzelm@34826
    67
wenzelm@38841
    68
  /** buffered command changes (delay_first discipline) **/
wenzelm@38841
    69
wenzelm@38841
    70
  private case object Stop
wenzelm@38841
    71
wenzelm@39572
    72
  private val (_, command_change_buffer) =
wenzelm@39572
    73
    Simple_Thread.actor("command_change_buffer", daemon = true)
wenzelm@38841
    74
  //{{{
wenzelm@38841
    75
  {
wenzelm@38841
    76
    import scala.compat.Platform.currentTime
wenzelm@38841
    77
wenzelm@38841
    78
    var changed: Set[Command] = Set()
wenzelm@38841
    79
    var flush_time: Option[Long] = None
wenzelm@38841
    80
wenzelm@38841
    81
    def flush_timeout: Long =
wenzelm@38841
    82
      flush_time match {
wenzelm@38841
    83
        case None => 5000L
wenzelm@38841
    84
        case Some(time) => (time - currentTime) max 0
wenzelm@38841
    85
      }
wenzelm@38841
    86
wenzelm@38841
    87
    def flush()
wenzelm@38841
    88
    {
wenzelm@38841
    89
      if (!changed.isEmpty) commands_changed.event(Session.Commands_Changed(changed))
wenzelm@38841
    90
      changed = Set()
wenzelm@38841
    91
      flush_time = None
wenzelm@38841
    92
    }
wenzelm@38841
    93
wenzelm@38841
    94
    def invoke()
wenzelm@38841
    95
    {
wenzelm@38841
    96
      val now = currentTime
wenzelm@38841
    97
      flush_time match {
wenzelm@38841
    98
        case None => flush_time = Some(now + output_delay)
wenzelm@38841
    99
        case Some(time) => if (now >= time) flush()
wenzelm@38841
   100
      }
wenzelm@38841
   101
    }
wenzelm@38841
   102
wenzelm@38841
   103
    var finished = false
wenzelm@38841
   104
    while (!finished) {
wenzelm@38841
   105
      receiveWithin(flush_timeout) {
wenzelm@38841
   106
        case command: Command => changed += command; invoke()
wenzelm@38841
   107
        case TIMEOUT => flush()
wenzelm@39630
   108
        case Stop => finished = true; reply(())
wenzelm@38841
   109
        case bad => System.err.println("command_change_buffer: ignoring bad message " + bad)
wenzelm@38841
   110
      }
wenzelm@38841
   111
    }
wenzelm@38841
   112
  }
wenzelm@38841
   113
  //}}}
wenzelm@38841
   114
wenzelm@38841
   115
wenzelm@38841
   116
wenzelm@38841
   117
  /** main protocol actor **/
wenzelm@34809
   118
wenzelm@34851
   119
  @volatile private var syntax = new Outer_Syntax(system.symbols)
wenzelm@38569
   120
  def current_syntax(): Outer_Syntax = syntax
wenzelm@34809
   121
wenzelm@39626
   122
  @volatile private var reverse_syslog = List[XML.Elem]()
wenzelm@39629
   123
  def syslog(): String = reverse_syslog.reverse.map(msg => XML.content(msg).mkString).mkString("\n")
wenzelm@39626
   124
wenzelm@39630
   125
  @volatile private var _phase: Session.Phase = Session.Inactive
wenzelm@39630
   126
  def phase = _phase
wenzelm@39633
   127
  private def phase_=(new_phase: Session.Phase)
wenzelm@39630
   128
  {
wenzelm@39630
   129
    val old_phase = _phase
wenzelm@39630
   130
    _phase = new_phase
wenzelm@39630
   131
    phase_changed.event(old_phase, new_phase)
wenzelm@39630
   132
  }
wenzelm@39630
   133
wenzelm@38841
   134
  private val global_state = new Volatile(Document.State.init)
wenzelm@38841
   135
  def current_state(): Document.State = global_state.peek()
wenzelm@34816
   136
wenzelm@39593
   137
  private case object Interrupt_Prover
wenzelm@38841
   138
  private case class Edit_Version(edits: List[Document.Node_Text_Edit])
wenzelm@39630
   139
  private case class Start(timeout: Int, args: List[String])
wenzelm@34777
   140
wenzelm@39572
   141
  private val (_, session_actor) = Simple_Thread.actor("session_actor", daemon = true)
wenzelm@38639
   142
  {
wenzelm@34809
   143
    var prover: Isabelle_Process with Isar_Document = null
wenzelm@34809
   144
wenzelm@34809
   145
wenzelm@34809
   146
    /* document changes */
wenzelm@34809
   147
wenzelm@38227
   148
    def handle_change(change: Document.Change)
wenzelm@38221
   149
    //{{{
wenzelm@34809
   150
    {
wenzelm@38848
   151
      val previous = change.previous.get_finished
wenzelm@39698
   152
      val (node_edits, version) = change.result.get_finished
wenzelm@38366
   153
wenzelm@38848
   154
      var former_assignment = global_state.peek().the_assignment(previous).get_finished
wenzelm@38370
   155
      for {
wenzelm@38370
   156
        (name, Some(cmd_edits)) <- node_edits
wenzelm@38370
   157
        (prev, None) <- cmd_edits
wenzelm@38417
   158
        removed <- previous.nodes(name).commands.get_after(prev)
wenzelm@38370
   159
      } former_assignment -= removed
wenzelm@38370
   160
wenzelm@38150
   161
      val id_edits =
wenzelm@38150
   162
        node_edits map {
wenzelm@38150
   163
          case (name, None) => (name, None)
wenzelm@38150
   164
          case (name, Some(cmd_edits)) =>
wenzelm@38370
   165
            val ids =
wenzelm@38150
   166
              cmd_edits map {
wenzelm@38150
   167
                case (c1, c2) =>
wenzelm@38150
   168
                  val id1 = c1.map(_.id)
wenzelm@38150
   169
                  val id2 =
wenzelm@38150
   170
                    c2 match {
wenzelm@38150
   171
                      case None => None
wenzelm@38150
   172
                      case Some(command) =>
wenzelm@38841
   173
                        if (global_state.peek().lookup_command(command.id).isEmpty) {
wenzelm@38841
   174
                          global_state.change(_.define_command(command))
wenzelm@38150
   175
                          prover.define_command(command.id, system.symbols.encode(command.source))
wenzelm@38150
   176
                        }
wenzelm@38150
   177
                        Some(command.id)
wenzelm@38150
   178
                    }
wenzelm@38150
   179
                  (id1, id2)
wenzelm@38150
   180
              }
wenzelm@38370
   181
            (name -> Some(ids))
wenzelm@38150
   182
        }
wenzelm@39698
   183
      global_state.change(_.define_version(version, former_assignment))
wenzelm@39698
   184
      prover.edit_version(previous.id, version.id, id_edits)
wenzelm@34809
   185
    }
wenzelm@38221
   186
    //}}}
wenzelm@34809
   187
wenzelm@34809
   188
wenzelm@34809
   189
    /* prover results */
wenzelm@34809
   190
wenzelm@34836
   191
    def bad_result(result: Isabelle_Process.Result)
wenzelm@34836
   192
    {
wenzelm@37041
   193
      System.err.println("Ignoring prover result: " + result.message.toString)
wenzelm@34836
   194
    }
wenzelm@34836
   195
wenzelm@34809
   196
    def handle_result(result: Isabelle_Process.Result)
wenzelm@38221
   197
    //{{{
wenzelm@34809
   198
    {
wenzelm@39588
   199
      raw_messages.event(result)
wenzelm@34799
   200
wenzelm@38722
   201
      result.properties match {
wenzelm@38722
   202
        case Position.Id(state_id) =>
wenzelm@38370
   203
          try {
wenzelm@38841
   204
            val st = global_state.change_yield(_.accumulate(state_id, result.message))
wenzelm@38841
   205
            command_change_buffer ! st.command
wenzelm@38370
   206
          }
wenzelm@38414
   207
          catch { case _: Document.State.Fail => bad_result(result) }
wenzelm@38722
   208
        case _ =>
wenzelm@39630
   209
          if (result.is_syslog) {
wenzelm@39630
   210
            reverse_syslog ::= result.message
wenzelm@39630
   211
            if (result.is_ready) phase = Session.Ready
wenzelm@39696
   212
            else if (result.is_exit) phase = Session.Inactive
wenzelm@39630
   213
          }
wenzelm@39626
   214
          else if (result.is_stdout) { }
wenzelm@39625
   215
          else if (result.is_status) {
wenzelm@38370
   216
            result.body match {
wenzelm@38417
   217
              case List(Isar_Document.Assign(id, edits)) =>
wenzelm@38849
   218
                try {
wenzelm@38882
   219
                  val cmds: List[Command] = global_state.change_yield(_.assign(id, edits))
wenzelm@38882
   220
                  for (cmd <- cmds) command_change_buffer ! cmd
wenzelm@38849
   221
                  assignments.event(Session.Assignment)
wenzelm@38849
   222
                }
wenzelm@38414
   223
                catch { case _: Document.State.Fail => bad_result(result) }
wenzelm@38370
   224
              case List(Keyword.Command_Decl(name, kind)) => syntax += (name, kind)
wenzelm@38370
   225
              case List(Keyword.Keyword_Decl(name)) => syntax += name
wenzelm@39625
   226
              case _ => bad_result(result)
wenzelm@38370
   227
            }
wenzelm@38370
   228
          }
wenzelm@39625
   229
          else bad_result(result)
wenzelm@34809
   230
        }
wenzelm@34809
   231
    }
wenzelm@38221
   232
    //}}}
wenzelm@34809
   233
wenzelm@34820
   234
wenzelm@39630
   235
    /* main loop */
wenzelm@34809
   236
wenzelm@38639
   237
    var finished = false
wenzelm@38639
   238
    while (!finished) {
wenzelm@38639
   239
      receive {
wenzelm@39593
   240
        case Interrupt_Prover =>
wenzelm@39593
   241
          if (prover != null) prover.interrupt
wenzelm@39593
   242
wenzelm@39630
   243
        case Edit_Version(edits) if prover != null =>
wenzelm@39698
   244
          val previous = global_state.peek().history.tip.version
wenzelm@38841
   245
          val result = Future.fork { Thy_Syntax.text_edits(Session.this, previous.join, edits) }
wenzelm@38841
   246
          val change = global_state.change_yield(_.extend_history(previous, edits, result))
wenzelm@38849
   247
wenzelm@38849
   248
          val this_actor = self
wenzelm@39698
   249
          change.version.map(_ => {
wenzelm@38849
   250
            assignments.await { global_state.peek().is_assigned(previous.get_finished) }
wenzelm@38849
   251
            this_actor ! change })
wenzelm@38849
   252
wenzelm@38841
   253
          reply(())
wenzelm@38841
   254
wenzelm@39630
   255
        case change: Document.Change if prover != null => handle_change(change)
wenzelm@39630
   256
wenzelm@39630
   257
        case result: Isabelle_Process.Result => handle_result(result)
wenzelm@38841
   258
wenzelm@39630
   259
        case Start(timeout, args) if prover == null =>
wenzelm@39696
   260
          phase = Session.Startup
wenzelm@39630
   261
          prover = new Isabelle_Process(system, timeout, self, args:_*) with Isar_Document
wenzelm@38841
   262
wenzelm@39630
   263
        case Stop if phase == Session.Ready =>
wenzelm@39630
   264
          global_state.change(_ => Document.State.init)  // FIXME event bus!?
wenzelm@39630
   265
          phase = Session.Shutdown
wenzelm@39630
   266
          prover.terminate
wenzelm@39633
   267
          phase = Session.Inactive
wenzelm@39630
   268
          finished = true
wenzelm@39630
   269
          reply(())
wenzelm@38850
   270
wenzelm@34820
   271
        case bad if prover != null =>
wenzelm@34777
   272
          System.err.println("session_actor: ignoring bad message " + bad)
wenzelm@34777
   273
      }
wenzelm@34777
   274
    }
wenzelm@34777
   275
  }
wenzelm@34777
   276
wenzelm@34809
   277
wenzelm@37129
   278
wenzelm@38226
   279
  /** main methods **/
wenzelm@34809
   280
wenzelm@39630
   281
  def start(timeout: Int, args: List[String]) { session_actor ! Start(timeout, args) }
wenzelm@34820
   282
wenzelm@39630
   283
  def stop() { command_change_buffer !? Stop; session_actor !? Stop }
wenzelm@38841
   284
wenzelm@39593
   285
  def interrupt() { session_actor ! Interrupt_Prover }
wenzelm@39593
   286
wenzelm@38841
   287
  def edit_version(edits: List[Document.Node_Text_Edit]) { session_actor !? Edit_Version(edits) }
wenzelm@38221
   288
wenzelm@38841
   289
  def snapshot(name: String, pending_edits: List[Text.Edit]): Document.Snapshot =
wenzelm@38841
   290
    global_state.peek().snapshot(name, pending_edits)
wenzelm@34777
   291
}