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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Martin Odersky
*/
package scala.tools.nsc
import java.io.{ BufferedOutputStream, FileOutputStream, PrintStream, File => JFile }
import io.File
import scala.tools.nsc.reporters.{Reporter, ConsoleReporter}
import scala.tools.nsc.util.FakePos //Position
import scala.tools.util.SocketServer
/**
* The server part of the fsc offline compiler. It awaits compilation
* commands and executes them. It caches a compiler instance so
* that it can respond more quickly.
*
* @author Martin Odersky
* @version 1.0
*/
class StandardCompileServer extends SocketServer {
lazy val compileSocket: CompileSocket = CompileSocket
val versionMsg = "Fast Scala compiler " +
Properties.versionString + " -- " +
Properties.copyrightString
val MaxCharge = 0.8
var shutDown: Boolean = false
private var compiler: Global = null
private def exit(code: Int): Nothing = {
System.err.close()
System.out.close()
sys.exit(code)
}
private val runtime = Runtime.getRuntime()
import runtime.{ totalMemory, freeMemory, maxMemory }
var reporter: ConsoleReporter = _
/** Create a new compiler instance */
def newGlobal(settings: Settings, reporter: Reporter) =
new Global(settings, reporter) {
override def inform(msg: String) = out.println(msg)
}
override def timeout() {
if (!compileSocket.portFile(port).exists)
fatal("port file no longer exists; skipping cleanup")
}
def printMemoryStats() {
System.out.println("New session, total memory = %s, max memory = %s, free memory = %s".format(
totalMemory, maxMemory, freeMemory))
System.out.flush()
}
def isMemoryFullEnough() = {
runtime.gc()
(totalMemory - freeMemory).toDouble / maxMemory.toDouble > MaxCharge
}
protected def newOfflineCompilerCommand(arguments: List[String], settings: Settings) =
new OfflineCompilerCommand(arguments, settings)
def session() {
printMemoryStats()
val password = compileSocket getPassword port
val guessedPassword = in.readLine()
val input = in.readLine()
def fscError(msg: String): Unit = out println (
FakePos("fsc"),
msg + "\n fsc -help gives more information"
)
if (input == null || password != guessedPassword)
return
val args = input.split("\0", -1).toList
val command = newOfflineCompilerCommand(args, new Settings(fscError))
if (command.fscShutdown.value) {
shutDown = true
return out.println("[Compile server exited]")
}
if (command.fscReset.value) {
compiler = null
return out.println("[Compile server was reset]")
}
reporter = new ConsoleReporter(command.settings, in, out) {
// disable prompts, so that compile server cannot block
override def displayPrompt = ()
}
if (command.shouldStopWithInfo)
reporter.info(null, command.getInfoMessage(newGlobal(command.settings, reporter)), true)
else if (command.files.isEmpty)
reporter.info(null, command.usageMsg, true)
else {
try {
if (compiler != null && command.settings == compiler.settings) {
compiler.settings = command.settings
compiler.reporter = reporter
}
else {
if (command.verbose) {
val reason = if (compiler == null) "compiler is null" else "settings not equal"
out.println("[Starting new compile server instance because %s]".format(reason))
}
compiler = newGlobal(command.settings, reporter)
}
val c = compiler
val run = new c.Run()
run compile command.files
}
catch {
case ex @ FatalError(msg) =>
if (command.debug)
ex.printStackTrace(out)
reporter.error(null, "fatal error: " + msg)
compiler = null
case ex: Throwable =>
ex.printStackTrace(out);
reporter.error(null, "fatal error (server aborted): " + ex.getMessage())
shutDown = true
}
}
reporter.printSummary()
if (isMemoryFullEnough)
compiler = null
}
}
object CompileServer extends StandardCompileServer {
/** A directory holding redirected output */
private val redirectDir = (compileSocket.tmpDir / "output-redirects").createDirectory()
private def redirect(setter: PrintStream => Unit, filename: String): Unit =
setter(new PrintStream((redirectDir / filename).createFile().bufferedOutput()))
def main(args: Array[String]) {
redirect(System.setOut, "scala-compile-server-out.log")
redirect(System.setErr, "scala-compile-server-err.log")
System.err.println("...starting server on socket "+port+"...")
System.err.flush()
compileSocket.setPort(port)
run()
compileSocket.deletePort(port)
exit(0)
}
}
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