more basic Markup.parse_int/print_int (using signed_string_of_int) (ML);
added convenient Markup.Int/Long objects (Scala);
simplified "assign" message format -- explicit version id;
misc tuning and simplification;
/* Title: Pure/System/isabelle_process.ML
Author: Makarius
Options: :folding=explicit:collapseFolds=1:
Isabelle process management -- always reactive due to multi-threaded I/O.
*/
package isabelle
import java.util.concurrent.LinkedBlockingQueue
import java.io.{BufferedReader, BufferedWriter, InputStreamReader, OutputStreamWriter,
InputStream, OutputStream, BufferedOutputStream, IOException}
import scala.actors.Actor
import Actor._
object Isabelle_Process
{
/* results */
object Kind {
// message markup
val markup = Map(
('A' : Int) -> Markup.INIT,
('B' : Int) -> Markup.STATUS,
('C' : Int) -> Markup.REPORT,
('D' : Int) -> Markup.WRITELN,
('E' : Int) -> Markup.TRACING,
('F' : Int) -> Markup.WARNING,
('G' : Int) -> Markup.ERROR,
('H' : Int) -> Markup.DEBUG)
def is_raw(kind: String) =
kind == Markup.STDOUT
def is_control(kind: String) =
kind == Markup.SYSTEM ||
kind == Markup.SIGNAL ||
kind == Markup.EXIT
def is_system(kind: String) =
kind == Markup.SYSTEM ||
kind == Markup.INPUT ||
kind == Markup.STDIN ||
kind == Markup.SIGNAL ||
kind == Markup.EXIT ||
kind == Markup.STATUS
}
class Result(val message: XML.Elem)
{
def kind = message.markup.name
def properties = message.markup.properties
def body = message.body
def is_raw = Kind.is_raw(kind)
def is_control = Kind.is_control(kind)
def is_system = Kind.is_system(kind)
def is_status = kind == Markup.STATUS
def is_report = kind == Markup.REPORT
def is_ready = is_status && body == List(XML.Elem(Markup.Ready, Nil))
override def toString: String =
{
val res =
if (is_status || is_report) message.body.map(_.toString).mkString
else Pretty.string_of(message.body)
if (properties.isEmpty)
kind.toString + " [[" + res + "]]"
else
kind.toString + " " +
(for ((x, y) <- properties) yield x + "=" + y).mkString("{", ",", "}") + " [[" + res + "]]"
}
def cache(c: XML.Cache): Result = new Result(c.cache_tree(message).asInstanceOf[XML.Elem])
}
}
class Isabelle_Process(system: Isabelle_System, receiver: Actor, args: String*)
{
import Isabelle_Process._
/* demo constructor */
def this(args: String*) =
this(new Isabelle_System,
actor { loop { react { case res => Console.println(res) } } }, args: _*)
/* process information */
@volatile private var proc: Option[Process] = None
@volatile private var pid: Option[String] = None
/* results */
private def put_result(kind: String, props: List[(String, String)], body: List[XML.Tree])
{
if (kind == Markup.INIT) {
for ((Markup.PID, p) <- props) pid = Some(p)
}
receiver ! new Result(XML.Elem(Markup(kind, props), body))
}
private def put_result(kind: String, text: String)
{
put_result(kind, Nil, List(XML.Text(system.symbols.decode(text))))
}
/* signals */
def interrupt()
{
if (proc.isEmpty) put_result(Markup.SYSTEM, "Cannot interrupt Isabelle: no process")
else
pid match {
case None => put_result(Markup.SYSTEM, "Cannot interrupt Isabelle: unknowd pid")
case Some(i) =>
try {
if (system.execute(true, "kill", "-INT", i).waitFor == 0)
put_result(Markup.SIGNAL, "INT")
else
put_result(Markup.SYSTEM, "Cannot interrupt Isabelle: kill command failed")
}
catch { case e: IOException => error("Cannot interrupt Isabelle: " + e.getMessage) }
}
}
def kill()
{
proc match {
case None => put_result(Markup.SYSTEM, "Cannot kill Isabelle: no process")
case Some(p) =>
close()
Thread.sleep(500) // FIXME !?
put_result(Markup.SIGNAL, "KILL")
p.destroy
proc = None
pid = None
}
}
/** stream actors **/
case class Input_Text(text: String)
case class Input_Chunks(chunks: List[Array[Byte]])
case object Close
/* raw stdin */
private def stdin_actor(name: String, stream: OutputStream): Actor =
Library.thread_actor(name) {
val writer = new BufferedWriter(new OutputStreamWriter(stream, Standard_System.charset))
var finished = false
while (!finished) {
try {
//{{{
receive {
case Input_Text(text) =>
// FIXME echo input?!
writer.write(text)
writer.flush
case Close =>
writer.close
finished = true
case bad => System.err.println(name + ": ignoring bad message " + bad)
}
//}}}
}
catch {
case e: IOException => put_result(Markup.SYSTEM, name + ": " + e.getMessage)
}
}
put_result(Markup.SYSTEM, name + " terminated")
}
/* raw stdout */
private def stdout_actor(name: String, stream: InputStream): Actor =
Library.thread_actor(name) {
val reader = new BufferedReader(new InputStreamReader(stream, Standard_System.charset))
var result = new StringBuilder(100)
var finished = false
while (!finished) {
try {
//{{{
var c = -1
var done = false
while (!done && (result.length == 0 || reader.ready)) {
c = reader.read
if (c >= 0) result.append(c.asInstanceOf[Char])
else done = true
}
if (result.length > 0) {
put_result(Markup.STDOUT, result.toString)
result.length = 0
}
else {
reader.close
finished = true
close()
}
//}}}
}
catch {
case e: IOException => put_result(Markup.SYSTEM, name + ": " + e.getMessage)
}
}
put_result(Markup.SYSTEM, name + " terminated")
}
/* command input */
private def input_actor(name: String, raw_stream: OutputStream): Actor =
Library.thread_actor(name) {
val stream = new BufferedOutputStream(raw_stream)
var finished = false
while (!finished) {
try {
//{{{
receive {
case Input_Chunks(chunks) =>
stream.write(Standard_System.string_bytes(
chunks.map(_.length).mkString("", ",", "\n")));
chunks.foreach(stream.write(_));
stream.flush
case Close =>
stream.close
finished = true
case bad => System.err.println(name + ": ignoring bad message " + bad)
}
//}}}
}
catch {
case e: IOException => put_result(Markup.SYSTEM, name + ": " + e.getMessage)
}
}
put_result(Markup.SYSTEM, name + " terminated")
}
/* message output */
private class Protocol_Error(msg: String) extends Exception(msg)
private def message_actor(name: String, stream: InputStream): Actor =
Library.thread_actor(name) {
val default_buffer = new Array[Byte](65536)
var c = -1
def read_chunk(): List[XML.Tree] =
{
//{{{
// chunk size
var n = 0
c = stream.read
while (48 <= c && c <= 57) {
n = 10 * n + (c - 48)
c = stream.read
}
if (c != 10) throw new Protocol_Error("bad message chunk header")
// chunk content
val buf =
if (n <= default_buffer.size) default_buffer
else new Array[Byte](n)
var i = 0
var m = 0
do {
m = stream.read(buf, i, n - i)
i += m
} while (m > 0 && n > i)
if (i != n) throw new Protocol_Error("bad message chunk content")
YXML.parse_body_failsafe(YXML.decode_chars(system.symbols.decode, buf, 0, n))
//}}}
}
do {
try {
//{{{
c = stream.read
var non_sync = 0
while (c >= 0 && c != 2) {
non_sync += 1
c = stream.read
}
if (non_sync > 0)
throw new Protocol_Error("lost synchronization -- skipping " + non_sync + " bytes")
if (c == 2) {
val header = read_chunk()
val body = read_chunk()
header match {
case List(XML.Elem(Markup(name, props), Nil))
if name.size == 1 && Kind.markup.isDefinedAt(name(0)) =>
put_result(Kind.markup(name(0)), props, body)
case _ => throw new Protocol_Error("bad header: " + header.toString)
}
}
//}}}
}
catch {
case e: IOException =>
put_result(Markup.SYSTEM, "Cannot read message:\n" + e.getMessage)
case e: Protocol_Error =>
put_result(Markup.SYSTEM, "Malformed message:\n" + e.getMessage)
}
} while (c != -1)
stream.close
close()
put_result(Markup.SYSTEM, name + " terminated")
}
/** init **/
/* exec process */
private val in_fifo = system.mk_fifo()
private val out_fifo = system.mk_fifo()
private def rm_fifos() = { system.rm_fifo(in_fifo); system.rm_fifo(out_fifo) }
try {
val cmdline =
List(system.getenv_strict("ISABELLE_PROCESS"), "-W", in_fifo + ":" + out_fifo) ++ args
proc = Some(system.execute(true, cmdline: _*))
}
catch {
case e: IOException =>
rm_fifos()
error("Failed to execute Isabelle process: " + e.getMessage)
}
/* I/O actors */
private val standard_input = stdin_actor("standard_input", proc.get.getOutputStream)
stdout_actor("standard_output", proc.get.getInputStream)
private val command_input = input_actor("command_input", system.fifo_output_stream(in_fifo))
message_actor("message_output", system.fifo_input_stream(out_fifo))
/* exit process */
Library.thread_actor("process_exit") {
proc match {
case None =>
case Some(p) =>
val rc = p.waitFor()
Thread.sleep(300) // FIXME property!?
put_result(Markup.SYSTEM, "process_exit terminated")
put_result(Markup.EXIT, rc.toString)
}
rm_fifos()
}
/** main methods **/
def input_raw(text: String): Unit = standard_input ! Input_Text(text)
def input_bytes(name: String, args: Array[Byte]*): Unit =
command_input ! Input_Chunks(Standard_System.string_bytes(name) :: args.toList)
def input(name: String, args: String*): Unit =
input_bytes(name, args.map(Standard_System.string_bytes): _*)
def close(): Unit = command_input ! Close
}