src/Pure/System/session.scala
author wenzelm
Thu Feb 27 14:07:04 2014 +0100 (2014-02-27 ago)
changeset 55783 da0513d95155
parent 55618 995162143ef4
child 55801 28b59620f0d0
permissions -rw-r--r--
more formal Document.Blobs;
removed junk;
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/*  Title:      Pure/System/session.scala
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    Author:     Makarius
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    Options:    :folding=explicit:collapseFolds=1:
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Main Isabelle/Scala session, potentially with running prover process.
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*/
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package isabelle
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import java.util.{Timer, TimerTask}
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import scala.collection.mutable
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import scala.collection.immutable.Queue
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import scala.actors.TIMEOUT
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import scala.actors.Actor._
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object Session
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{
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  /* events */
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  //{{{
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  case class Statistics(props: Properties.T)
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  case class Global_Options(options: Options)
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  case object Caret_Focus
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  case class Raw_Edits(doc_blobs: Document.Blobs, edits: List[Document.Edit_Text])
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  case class Dialog_Result(id: Document_ID.Generic, serial: Long, result: String)
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  case class Commands_Changed(
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    assignment: Boolean, nodes: Set[Document.Node.Name], commands: Set[Command])
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  sealed abstract class Phase
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  case object Inactive extends Phase
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  case object Startup extends Phase  // transient
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  case object Failed extends Phase
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  case object Ready extends Phase
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  case object Shutdown extends Phase  // transient
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  //}}}
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  /* protocol handlers */
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  type Prover = Isabelle_Process with Protocol
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  abstract class Protocol_Handler
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  {
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    def stop(prover: Prover): Unit = {}
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    val functions: Map[String, (Prover, Isabelle_Process.Protocol_Output) => Boolean]
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  }
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  class Protocol_Handlers(
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    handlers: Map[String, Session.Protocol_Handler] = Map.empty,
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    functions: Map[String, Isabelle_Process.Protocol_Output => Boolean] = Map.empty)
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  {
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    def get(name: String): Option[Protocol_Handler] = handlers.get(name)
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    def add(prover: Prover, name: String): Protocol_Handlers =
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    {
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      val (handlers1, functions1) =
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        handlers.get(name) match {
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          case Some(old_handler) =>
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            System.err.println("Redefining protocol handler: " + name)
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            old_handler.stop(prover)
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            (handlers - name, functions -- old_handler.functions.keys)
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          case None => (handlers, functions)
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        }
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      val (handlers2, functions2) =
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        try {
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          val new_handler = Class.forName(name).newInstance.asInstanceOf[Protocol_Handler]
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          val new_functions =
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            for ((a, f) <- new_handler.functions.toList) yield
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              (a, (msg: Isabelle_Process.Protocol_Output) => f(prover, msg))
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          val dups = for ((a, _) <- new_functions if functions1.isDefinedAt(a)) yield a
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          if (!dups.isEmpty) error("Duplicate protocol functions: " + commas_quote(dups))
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          (handlers1 + (name -> new_handler), functions1 ++ new_functions)
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        }
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        catch {
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          case exn: Throwable =>
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            System.err.println("Failed to initialize protocol handler: " +
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              name + "\n" + Exn.message(exn))
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            (handlers1, functions1)
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        }
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      new Protocol_Handlers(handlers2, functions2)
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    }
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    def invoke(msg: Isabelle_Process.Protocol_Output): Boolean =
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      msg.properties match {
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        case Markup.Function(a) if functions.isDefinedAt(a) =>
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          try { functions(a)(msg) }
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          catch {
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            case exn: Throwable =>
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              System.err.println("Failed invocation of protocol function: " +
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                quote(a) + "\n" + Exn.message(exn))
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            false
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          }
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        case _ => false
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      }
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    def stop(prover: Prover): Protocol_Handlers =
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    {
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      for ((_, handler) <- handlers) handler.stop(prover)
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      new Protocol_Handlers()
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    }
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  }
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}
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class Session(val thy_load: Thy_Load)
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{
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  /* global flags */
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  @volatile var timing: Boolean = false
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  @volatile var verbose: Boolean = false
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  /* tuning parameters */
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  def output_delay: Time = Time.seconds(0.1)  // prover output (markup, common messages)
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  def message_delay: Time = Time.seconds(0.1)  // prover input/output messages
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  def prune_delay: Time = Time.seconds(60.0)  // prune history -- delete old versions
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  def prune_size: Int = 0  // size of retained history
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  def syslog_limit: Int = 100
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  def reparse_limit: Int = 0
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  /* pervasive event buses */
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  val statistics = new Event_Bus[Session.Statistics]
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  val global_options = new Event_Bus[Session.Global_Options]
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  val caret_focus = new Event_Bus[Session.Caret_Focus.type]
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  val raw_edits = new Event_Bus[Session.Raw_Edits]
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  val commands_changed = new Event_Bus[Session.Commands_Changed]
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  val phase_changed = new Event_Bus[Session.Phase]
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  val syslog_messages = new Event_Bus[Isabelle_Process.Output]
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  val raw_output_messages = new Event_Bus[Isabelle_Process.Output]
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  val all_messages = new Event_Bus[Isabelle_Process.Message]  // potential bottle-neck
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  val trace_events = new Event_Bus[Simplifier_Trace.Event.type]
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  /** buffered command changes (delay_first discipline) **/
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  //{{{
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  private case object Stop
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  private val (_, commands_changed_buffer) =
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    Simple_Thread.actor("commands_changed_buffer", daemon = true)
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  {
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    var finished = false
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    while (!finished) {
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      receive {
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        case Stop => finished = true; reply(())
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        case changed: Session.Commands_Changed => commands_changed.event(changed)
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        case bad => System.err.println("commands_changed_buffer: ignoring bad message " + bad)
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      }
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    }
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  }
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  //}}}
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  /** pipelined change parsing **/
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  //{{{
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  private case class Text_Edits(
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    previous: Future[Document.Version],
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    doc_blobs: Document.Blobs,
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    text_edits: List[Document.Edit_Text],
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    version_result: Promise[Document.Version])
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  private val (_, change_parser) = Simple_Thread.actor("change_parser", daemon = true)
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  {
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    var finished = false
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    while (!finished) {
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      receive {
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        case Stop => finished = true; reply(())
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        case Text_Edits(previous, doc_blobs, text_edits, version_result) =>
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          val prev = previous.get_finished
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          val (syntax_changed, doc_edits, version) =
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            Timing.timeit("Thy_Load.text_edits", timing) {
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              thy_load.text_edits(reparse_limit, prev, doc_blobs, text_edits)
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            }
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          version_result.fulfill(version)
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          sender ! Change(doc_blobs, syntax_changed, doc_edits, prev, version)
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        case bad => System.err.println("change_parser: ignoring bad message " + bad)
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      }
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    }
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  }
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  //}}}
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  /** main protocol actor **/
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  /* global state */
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  private val syslog = Volatile(Queue.empty[XML.Elem])
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  def current_syslog(): String = cat_lines(syslog().iterator.map(XML.content))
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  @volatile private var _phase: Session.Phase = Session.Inactive
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  private def phase_=(new_phase: Session.Phase)
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  {
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    _phase = new_phase
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    phase_changed.event(new_phase)
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  }
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  def phase = _phase
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  def is_ready: Boolean = phase == Session.Ready
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  private val global_state = Volatile(Document.State.init)
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  def current_state(): Document.State = global_state()
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  def recent_syntax(): Outer_Syntax =
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  {
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    val version = current_state().recent_finished.version.get_finished
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    if (version.is_init) thy_load.base_syntax
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    else version.syntax
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  }
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  def snapshot(name: Document.Node.Name = Document.Node.Name.empty,
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      pending_edits: List[Text.Edit] = Nil): Document.Snapshot =
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    global_state().snapshot(name, pending_edits)
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  /* protocol handlers */
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  @volatile private var _protocol_handlers = new Session.Protocol_Handlers()
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  def protocol_handler(name: String): Option[Session.Protocol_Handler] =
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    _protocol_handlers.get(name)
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  /* theory files */
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  def header_edit(name: Document.Node.Name, header: Document.Node.Header): Document.Edit_Text =
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  {
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    val header1 =
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      if (thy_load.loaded_theories(name.theory))
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        header.error("Cannot update finished theory " + quote(name.theory))
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      else header
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    (name, Document.Node.Deps(header1))
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  }
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  /* actor messages */
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  private case class Start(args: List[String])
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  private case class Cancel_Exec(exec_id: Document_ID.Exec)
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  private case class Change(
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    doc_blobs: Document.Blobs,
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    syntax_changed: Boolean,
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    doc_edits: List[Document.Edit_Command],
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    previous: Document.Version,
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    version: Document.Version)
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  private case class Protocol_Command(name: String, args: List[String])
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  private case class Messages(msgs: List[Isabelle_Process.Message])
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  private case class Update_Options(options: Options)
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  private val (_, session_actor) = Simple_Thread.actor("session_actor", daemon = true)
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  {
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    val this_actor = self
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    var prune_next = System.currentTimeMillis() + prune_delay.ms
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    /* buffered prover messages */
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    object receiver
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    {
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      private var buffer = new mutable.ListBuffer[Isabelle_Process.Message]
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      private def flush(): Unit = synchronized {
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        if (!buffer.isEmpty) {
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          val msgs = buffer.toList
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          this_actor ! Messages(msgs)
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          buffer = new mutable.ListBuffer[Isabelle_Process.Message]
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        }
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      }
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      def invoke(msg: Isabelle_Process.Message): Unit = synchronized {
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        msg match {
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          case _: Isabelle_Process.Input =>
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            buffer += msg
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          case output: Isabelle_Process.Protocol_Output if output.properties == Markup.Flush =>
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            flush()
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          case output: Isabelle_Process.Output =>
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            buffer += msg
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            if (output.is_syslog)
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              syslog >> (queue =>
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                {
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                  val queue1 = queue.enqueue(output.message)
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                  if (queue1.length > syslog_limit) queue1.dequeue._2 else queue1
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                })
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        }
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      }
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      private val timer = new Timer("session_actor.receiver", true)
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      timer.schedule(new TimerTask { def run = flush }, message_delay.ms, message_delay.ms)
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      def cancel() { timer.cancel() }
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    }
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    var prover: Option[Session.Prover] = None
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    /* delayed command changes */
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    object delay_commands_changed
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    {
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      private var changed_assignment: Boolean = false
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      private var changed_nodes: Set[Document.Node.Name] = Set.empty
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      private var changed_commands: Set[Command] = Set.empty
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      private var flush_time: Option[Long] = None
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      def flush_timeout: Long =
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        flush_time match {
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          case None => 5000L
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          case Some(time) => (time - System.currentTimeMillis()) max 0
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        }
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      def flush()
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      {
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        if (changed_assignment || !changed_nodes.isEmpty || !changed_commands.isEmpty)
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          commands_changed_buffer !
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            Session.Commands_Changed(changed_assignment, changed_nodes, changed_commands)
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        changed_assignment = false
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        changed_nodes = Set.empty
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        changed_commands = Set.empty
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        flush_time = None
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      }
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      def invoke(assign: Boolean, commands: List[Command])
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      {
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        changed_assignment |= assign
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        for (command <- commands) {
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          changed_nodes += command.node_name
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          changed_commands += command
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        }
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        val now = System.currentTimeMillis()
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        flush_time match {
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          case None => flush_time = Some(now + output_delay.ms)
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          case Some(time) => if (now >= time) flush()
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        }
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      }
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    }
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    /* raw edits */
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    def handle_raw_edits(doc_blobs: Document.Blobs, edits: List[Document.Edit_Text])
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    //{{{
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    {
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      prover.get.discontinue_execution()
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      val previous = global_state().history.tip.version
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      val version = Future.promise[Document.Version]
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      val change = global_state >>> (_.continue_history(previous, edits, version))
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      raw_edits.event(Session.Raw_Edits(doc_blobs, edits))
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      change_parser ! Text_Edits(previous, doc_blobs, edits, version)
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    }
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    //}}}
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    /* resulting changes */
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    def handle_change(change: Change)
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    //{{{
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    {
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   373
      val Change(doc_blobs, syntax_changed, doc_edits, previous, version) = change
wenzelm@38366
   374
wenzelm@44383
   375
      def id_command(command: Command)
wenzelm@43720
   376
      {
wenzelm@54519
   377
        for {
wenzelm@54519
   378
          digest <- command.blobs_digests
wenzelm@54519
   379
          if !global_state().defined_blob(digest)
wenzelm@54519
   380
        } {
wenzelm@55783
   381
          doc_blobs.retrieve(digest) match {
wenzelm@54519
   382
            case Some(blob) =>
wenzelm@54519
   383
              global_state >> (_.define_blob(digest))
wenzelm@54519
   384
              prover.get.define_blob(blob)
wenzelm@55783
   385
            case None =>
wenzelm@55783
   386
              System.err.println("Missing blob for SHA1 digest " + digest)
wenzelm@54519
   387
          }
wenzelm@54519
   388
        }
wenzelm@54519
   389
wenzelm@44582
   390
        if (!global_state().defined_command(command.id)) {
wenzelm@46687
   391
          global_state >> (_.define_command(command))
wenzelm@44644
   392
          prover.get.define_command(command)
wenzelm@43720
   393
        }
wenzelm@43720
   394
      }
wenzelm@44383
   395
      doc_edits foreach {
wenzelm@44383
   396
        case (_, edit) =>
wenzelm@44383
   397
          edit foreach { case (c1, c2) => c1 foreach id_command; c2 foreach id_command }
wenzelm@44383
   398
      }
wenzelm@43722
   399
wenzelm@44479
   400
      val assignment = global_state().the_assignment(previous).check_finished
wenzelm@46687
   401
      global_state >> (_.define_version(version, assignment))
wenzelm@44481
   402
      prover.get.update(previous.id, version.id, doc_edits)
wenzelm@55134
   403
wenzelm@55134
   404
      if (syntax_changed) thy_load.syntax_changed()
wenzelm@34809
   405
    }
wenzelm@38221
   406
    //}}}
wenzelm@34809
   407
wenzelm@34809
   408
wenzelm@46772
   409
    /* prover output */
wenzelm@34809
   410
wenzelm@46772
   411
    def handle_output(output: Isabelle_Process.Output)
wenzelm@38221
   412
    //{{{
wenzelm@34809
   413
    {
wenzelm@51662
   414
      def bad_output()
wenzelm@43716
   415
      {
wenzelm@43716
   416
        if (verbose)
wenzelm@46772
   417
          System.err.println("Ignoring prover output: " + output.message.toString)
wenzelm@43716
   418
      }
wenzelm@43716
   419
wenzelm@52531
   420
      def accumulate(state_id: Document_ID.Generic, message: XML.Elem)
wenzelm@51662
   421
      {
wenzelm@51662
   422
        try {
wenzelm@51662
   423
          val st = global_state >>> (_.accumulate(state_id, message))
wenzelm@51662
   424
          delay_commands_changed.invoke(false, List(st.command))
wenzelm@51662
   425
        }
wenzelm@51662
   426
        catch {
wenzelm@51662
   427
          case _: Document.State.Fail => bad_output()
wenzelm@51662
   428
        }
wenzelm@51662
   429
      }
wenzelm@51662
   430
wenzelm@54442
   431
      output match {
wenzelm@54442
   432
        case msg: Isabelle_Process.Protocol_Output =>
wenzelm@54442
   433
          val handled = _protocol_handlers.invoke(msg)
wenzelm@54442
   434
          if (!handled) {
wenzelm@54442
   435
            msg.properties match {
wenzelm@54442
   436
              case Markup.Protocol_Handler(name) =>
wenzelm@54442
   437
                _protocol_handlers = _protocol_handlers.add(prover.get, name)
wenzelm@54442
   438
wenzelm@54442
   439
              case Protocol.Command_Timing(state_id, timing) =>
wenzelm@54442
   440
                val message = XML.elem(Markup.STATUS, List(XML.Elem(Markup.Timing(timing), Nil)))
wenzelm@54442
   441
                accumulate(state_id, prover.get.xml_cache.elem(message))
wenzelm@46122
   442
wenzelm@54442
   443
              case Markup.Assign_Update =>
wenzelm@54442
   444
                msg.text match {
wenzelm@54442
   445
                  case Protocol.Assign_Update(id, update) =>
wenzelm@54442
   446
                    try {
wenzelm@54442
   447
                      val cmds = global_state >>> (_.assign(id, update))
wenzelm@54442
   448
                      delay_commands_changed.invoke(true, cmds)
wenzelm@54442
   449
                    }
wenzelm@54442
   450
                    catch { case _: Document.State.Fail => bad_output() }
wenzelm@54442
   451
                  case _ => bad_output()
wenzelm@54442
   452
                }
wenzelm@54442
   453
                // FIXME separate timeout event/message!?
wenzelm@54442
   454
                if (prover.isDefined && System.currentTimeMillis() > prune_next) {
wenzelm@54442
   455
                  val old_versions = global_state >>> (_.prune_history(prune_size))
wenzelm@54442
   456
                  if (!old_versions.isEmpty) prover.get.remove_versions(old_versions)
wenzelm@54442
   457
                  prune_next = System.currentTimeMillis() + prune_delay.ms
wenzelm@54442
   458
                }
wenzelm@46122
   459
wenzelm@54442
   460
              case Markup.Removed_Versions =>
wenzelm@54442
   461
                msg.text match {
wenzelm@54442
   462
                  case Protocol.Removed(removed) =>
wenzelm@54442
   463
                    try {
wenzelm@54442
   464
                      global_state >> (_.removed_versions(removed))
wenzelm@54442
   465
                    }
wenzelm@54442
   466
                    catch { case _: Document.State.Fail => bad_output() }
wenzelm@54442
   467
                  case _ => bad_output()
wenzelm@54442
   468
                }
wenzelm@54442
   469
wenzelm@54442
   470
              case Markup.ML_Statistics(props) =>
wenzelm@54442
   471
                statistics.event(Session.Statistics(props))
wenzelm@54442
   472
wenzelm@54442
   473
              case Markup.Task_Statistics(props) =>
wenzelm@54442
   474
                // FIXME
wenzelm@52111
   475
wenzelm@54442
   476
              case _ => bad_output()
wenzelm@54442
   477
            }
wenzelm@54442
   478
          }
wenzelm@54442
   479
        case _ =>
wenzelm@54442
   480
          output.properties match {
wenzelm@54442
   481
            case Position.Id(state_id) =>
wenzelm@54442
   482
              accumulate(state_id, output.message)
wenzelm@54442
   483
  
wenzelm@54442
   484
            case _ if output.is_init =>
wenzelm@54442
   485
              phase = Session.Ready
wenzelm@54442
   486
  
wenzelm@54442
   487
            case Markup.Return_Code(rc) if output.is_exit =>
wenzelm@54442
   488
              if (rc == 0) phase = Session.Inactive
wenzelm@54442
   489
              else phase = Session.Failed
wenzelm@54442
   490
  
wenzelm@54442
   491
            case _ => raw_output_messages.event(output)
wenzelm@44661
   492
          }
wenzelm@52111
   493
        }
wenzelm@34809
   494
    }
wenzelm@38221
   495
    //}}}
wenzelm@34809
   496
wenzelm@34820
   497
wenzelm@39630
   498
    /* main loop */
wenzelm@34809
   499
wenzelm@43716
   500
    //{{{
wenzelm@38639
   501
    var finished = false
wenzelm@38639
   502
    while (!finished) {
wenzelm@46570
   503
      receiveWithin(delay_commands_changed.flush_timeout) {
wenzelm@46570
   504
        case TIMEOUT => delay_commands_changed.flush()
wenzelm@44722
   505
wenzelm@48870
   506
        case Start(args) if prover.isEmpty =>
wenzelm@39701
   507
          if (phase == Session.Inactive || phase == Session.Failed) {
wenzelm@39701
   508
            phase = Session.Startup
wenzelm@48020
   509
            prover = Some(new Isabelle_Process(receiver.invoke _, args) with Protocol)
wenzelm@39701
   510
          }
wenzelm@38841
   511
wenzelm@39701
   512
        case Stop =>
wenzelm@39701
   513
          if (phase == Session.Ready) {
wenzelm@53054
   514
            _protocol_handlers = _protocol_handlers.stop(prover.get)
wenzelm@46687
   515
            global_state >> (_ => Document.State.init)  // FIXME event bus!?
wenzelm@39701
   516
            phase = Session.Shutdown
wenzelm@43649
   517
            prover.get.terminate
wenzelm@43717
   518
            prover = None
wenzelm@39701
   519
            phase = Session.Inactive
wenzelm@39701
   520
          }
wenzelm@39630
   521
          finished = true
wenzelm@44733
   522
          receiver.cancel()
wenzelm@39630
   523
          reply(())
wenzelm@38850
   524
wenzelm@52084
   525
        case Update_Options(options) if prover.isDefined =>
wenzelm@52649
   526
          if (is_ready) {
wenzelm@52649
   527
            prover.get.options(options)
wenzelm@55783
   528
            handle_raw_edits(Document.Blobs.empty, Nil)
wenzelm@52649
   529
          }
wenzelm@52084
   530
          global_options.event(Session.Global_Options(options))
wenzelm@52084
   531
          reply(())
wenzelm@50117
   532
wenzelm@52931
   533
        case Cancel_Exec(exec_id) if prover.isDefined =>
wenzelm@52931
   534
          prover.get.cancel_exec(exec_id)
wenzelm@52931
   535
wenzelm@54521
   536
        case Session.Raw_Edits(doc_blobs, edits) if prover.isDefined =>
wenzelm@54521
   537
          handle_raw_edits(doc_blobs, edits)
wenzelm@43718
   538
          reply(())
wenzelm@43718
   539
wenzelm@50500
   540
        case Session.Dialog_Result(id, serial, result) if prover.isDefined =>
wenzelm@50500
   541
          prover.get.dialog_result(serial, result)
wenzelm@50501
   542
          handle_output(new Isabelle_Process.Output(Protocol.Dialog_Result(id, serial, result)))
wenzelm@50498
   543
wenzelm@53054
   544
        case Protocol_Command(name, args) if prover.isDefined =>
wenzelm@53054
   545
          prover.get.protocol_command(name, args:_*)
wenzelm@53054
   546
wenzelm@44733
   547
        case Messages(msgs) =>
wenzelm@44733
   548
          msgs foreach {
wenzelm@44733
   549
            case input: Isabelle_Process.Input =>
wenzelm@46774
   550
              all_messages.event(input)
wenzelm@43721
   551
wenzelm@46772
   552
            case output: Isabelle_Process.Output =>
wenzelm@48999
   553
              if (output.is_stdout || output.is_stderr) raw_output_messages.event(output)
wenzelm@48999
   554
              else handle_output(output)
wenzelm@46772
   555
              if (output.is_syslog) syslog_messages.event(output)
wenzelm@46774
   556
              all_messages.event(output)
wenzelm@44733
   557
          }
wenzelm@43716
   558
wenzelm@47629
   559
        case change: Change
wenzelm@45635
   560
        if prover.isDefined && global_state().is_assigned(change.previous) =>
wenzelm@45635
   561
          handle_change(change)
wenzelm@45635
   562
wenzelm@47629
   563
        case bad if !bad.isInstanceOf[Change] =>
wenzelm@45635
   564
          System.err.println("session_actor: ignoring bad message " + bad)
wenzelm@34777
   565
      }
wenzelm@34777
   566
    }
wenzelm@43716
   567
    //}}}
wenzelm@34777
   568
  }
wenzelm@34777
   569
wenzelm@34809
   570
wenzelm@43716
   571
  /* actions */
wenzelm@34809
   572
wenzelm@48870
   573
  def start(args: List[String])
wenzelm@50117
   574
  {
wenzelm@50117
   575
    session_actor ! Start(args)
wenzelm@50117
   576
  }
wenzelm@45076
   577
wenzelm@50117
   578
  def stop()
wenzelm@50117
   579
  {
wenzelm@50117
   580
    commands_changed_buffer !? Stop
wenzelm@50117
   581
    change_parser !? Stop
wenzelm@50117
   582
    session_actor !? Stop
wenzelm@50117
   583
  }
wenzelm@38841
   584
wenzelm@53054
   585
  def protocol_command(name: String, args: String*)
wenzelm@53054
   586
  { session_actor ! Protocol_Command(name, args.toList) }
wenzelm@53054
   587
wenzelm@52931
   588
  def cancel_exec(exec_id: Document_ID.Exec) { session_actor ! Cancel_Exec(exec_id) }
wenzelm@52931
   589
wenzelm@54521
   590
  def update(doc_blobs: Document.Blobs, edits: List[Document.Edit_Text])
wenzelm@54521
   591
  { if (!edits.isEmpty) session_actor !? Session.Raw_Edits(doc_blobs, edits) }
wenzelm@50498
   592
wenzelm@52084
   593
  def update_options(options: Options)
wenzelm@52084
   594
  { session_actor !? Update_Options(options) }
wenzelm@52084
   595
wenzelm@52531
   596
  def dialog_result(id: Document_ID.Generic, serial: Long, result: String)
wenzelm@50500
   597
  { session_actor ! Session.Dialog_Result(id, serial, result) }
wenzelm@34777
   598
}