author | wenzelm |
Sun, 04 Jul 2010 00:05:32 +0200 | |
changeset 37689 | 628eabe2213a |
parent 37132 | 10ef4da1c314 |
child 37849 | 4f9de312cc23 |
permissions | -rw-r--r-- |
36676 | 1 |
/* Title: Pure/System/session.scala |
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Author: Makarius |
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Isabelle session, potentially with running prover. |
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*/ |
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package isabelle |
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class Session models full session, with or without prover process (cf. heaps, browser_info);
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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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case object Global_Settings |
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/* managed entities */ |
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type Entity_ID = String |
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trait Entity |
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{ |
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val id: Entity_ID |
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def consume(message: XML.Tree, forward: Command => Unit): Unit |
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} |
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} |
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class Session(system: Isabelle_System) |
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{ |
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/* pervasive event buses */ |
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val global_settings = new Event_Bus[Session.Global_Settings.type] |
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val raw_results = new Event_Bus[Isabelle_Process.Result] |
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val raw_output = new Event_Bus[Isabelle_Process.Result] |
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val commands_changed = new Event_Bus[Command_Set] |
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/* unique ids */ |
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private var id_count: BigInt = 0 |
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def create_id(): Session.Entity_ID = synchronized { id_count += 1; "j" + id_count } |
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/** main actor **/ |
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@volatile private var syntax = new Outer_Syntax(system.symbols) |
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def current_syntax: Outer_Syntax = syntax |
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@volatile private var entities = Map[Session.Entity_ID, Session.Entity]() |
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def lookup_entity(id: Session.Entity_ID): Option[Session.Entity] = entities.get(id) |
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def lookup_command(id: Session.Entity_ID): Option[Command] = |
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lookup_entity(id) match { |
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case Some(cmd: Command) => Some(cmd) |
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case _ => None |
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} |
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private case class Start(timeout: Int, args: List[String]) |
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private case object Stop |
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private case class Begin_Document(path: String) |
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private lazy val session_actor = actor { |
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var prover: Isabelle_Process with Isar_Document = null |
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def register(entity: Session.Entity) { entities += (entity.id -> entity) } |
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var documents = Map[Isar_Document.Document_ID, Document]() |
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def register_document(doc: Document) { documents += (doc.id -> doc) } |
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/* document changes */ |
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def handle_change(change: Change) |
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{ |
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require(change.parent.isDefined) |
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val (changes, doc) = change.result.join |
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val id_changes = changes map { |
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case (c1, c2) => |
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(c1.map(_.id).getOrElse(""), |
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c2 match { |
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case None => None |
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case Some(command) => |
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if (!lookup_command(command.id).isDefined) { |
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register(command) |
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prover.define_command(command.id, system.symbols.encode(command.source)) |
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} |
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Some(command.id) |
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}) |
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} |
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register_document(doc) |
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prover.edit_document(change.parent.get.id, doc.id, id_changes) |
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} |
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/* prover results */ |
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def bad_result(result: Isabelle_Process.Result) |
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{ |
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System.err.println("Ignoring prover result: " + result.message.toString) |
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} |
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def handle_result(result: Isabelle_Process.Result) |
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{ |
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raw_results.event(result) |
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val target_id: Option[Session.Entity_ID] = Position.get_id(result.message.attributes) |
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val target: Option[Session.Entity] = |
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target_id match { |
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case None => None |
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case Some(id) => lookup_entity(id) |
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} |
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if (target.isDefined) target.get.consume(result.message, indicate_command_change) |
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else if (result.is_status) { |
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// global status message |
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result.body match { |
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// document state assignment |
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case List(Isar_Document.Assign(edits)) if target_id.isDefined => |
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documents.get(target_id.get) match { |
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case Some(doc) => |
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val states = |
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for { |
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Isar_Document.Edit(cmd_id, state_id) <- edits |
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cmd <- lookup_command(cmd_id) |
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} yield { |
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val st = cmd.assign_state(state_id) |
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register(st) |
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(cmd, st) |
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} |
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doc.assign_states(states) |
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case None => bad_result(result) |
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} |
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// keyword declarations |
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case List(Keyword.Command_Decl(name, kind)) => syntax += (name, kind) |
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case List(Keyword.Keyword_Decl(name)) => syntax += name |
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case _ => if (!result.is_ready) bad_result(result) |
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} |
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} |
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else if (result.kind == Markup.EXIT) |
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prover = null |
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else if (result.is_raw) |
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raw_output.event(result) |
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else if (!result.is_system) // FIXME syslog (!?) |
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bad_result(result) |
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} |
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/* prover startup */ |
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def startup_error(): String = |
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{ |
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val buf = new StringBuilder |
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while ( |
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receiveWithin(0) { |
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case result: Isabelle_Process.Result => |
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if (result.is_raw) { |
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for (text <- XML.content(result.message)) |
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buf.append(text) |
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} |
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true |
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case TIMEOUT => false |
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}) {} |
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buf.toString |
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} |
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def prover_startup(timeout: Int): Option[String] = |
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{ |
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receiveWithin(timeout) { |
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case result: Isabelle_Process.Result |
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if result.kind == Markup.INIT => |
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while (receive { |
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case result: Isabelle_Process.Result => |
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handle_result(result); !result.is_ready |
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}) {} |
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None |
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case result: Isabelle_Process.Result |
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if result.kind == Markup.EXIT => |
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Some(startup_error()) |
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|
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case TIMEOUT => // FIXME clarify |
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prover.kill; Some(startup_error()) |
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} |
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} |
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/* main loop */ |
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val xml_cache = new XML.Cache(131071) |
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|
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loop { |
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react { |
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case Start(timeout, args) => |
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if (prover == null) { |
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prover = new Isabelle_Process(system, self, args:_*) with Isar_Document |
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val origin = sender |
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val opt_err = prover_startup(timeout) |
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if (opt_err.isDefined) prover = null |
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origin ! opt_err |
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} |
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else reply(None) |
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|
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case Stop => // FIXME clarify; synchronous |
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if (prover != null) { |
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prover.kill |
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prover = null |
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} |
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|
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case Begin_Document(path: String) if prover != null => |
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val id = create_id() |
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val doc = Document.empty(id) |
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register_document(doc) |
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prover.begin_document(id, path) |
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reply(doc) |
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case change: Change if prover != null => |
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handle_change(change) |
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|
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case result: Isabelle_Process.Result => |
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handle_result(result.cache(xml_cache)) |
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|
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case TIMEOUT => // FIXME clarify! |
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|
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case bad if prover != null => |
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System.err.println("session_actor: ignoring bad message " + bad) |
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} |
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} |
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} |
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/** buffered command changes -- delay_first discipline **/ |
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private lazy val command_change_buffer = actor { |
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import scala.compat.Platform.currentTime |
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245 |
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var changed: Set[Command] = Set() |
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var flush_time: Option[Long] = None |
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||
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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 - currentTime) max 0 |
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} |
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def flush() |
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{ |
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257 |
if (!changed.isEmpty) commands_changed.event(Command_Set(changed)) |
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changed = Set() |
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flush_time = None |
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} |
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||
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def invoke() |
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{ |
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val now = currentTime |
|
265 |
flush_time match { |
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case None => flush_time = Some(now + 100) // FIXME output_delay property |
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case Some(time) => if (now >= time) flush() |
268 |
} |
|
269 |
} |
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loop { |
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reactWithin(flush_timeout) { |
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case command: Command => changed += command; invoke() |
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case TIMEOUT => flush() |
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case bad => System.err.println("command_change_buffer: ignoring bad message " + bad) |
|
276 |
} |
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} |
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} |
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def indicate_command_change(command: Command) |
|
281 |
{ |
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282 |
command_change_buffer ! command |
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283 |
} |
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/* main methods */ |
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def start(timeout: Int, args: List[String]): Option[String] = |
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(session_actor !? Start(timeout, args)).asInstanceOf[Option[String]] |
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|
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def stop() { session_actor ! Stop } |
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def input(change: Change) { session_actor ! change } |
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def begin_document(path: String): Document = |
295 |
(session_actor !? Begin_Document(path)).asInstanceOf[Document] |
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} |