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MonadicTSpaceDesignPattern.scala
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MonadicTSpaceDesignPattern.scala
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// -*- mode: Scala;-*-
// Filename: TSpaceDesignPattern.scala
// Authors: lgm
// Creation: Mon Sep 6 17:57:30 2010
// Copyright: Not supplied
// Description:
// ------------------------------------------------------------------------
package com.biosimilarity.lift.model.store
import com.biosimilarity.lift.lib._
import scala.concurrent.{Channel => Chan, _}
import scala.concurrent.cpsops._
import scala.util.continuations._
import scala.collection.MapProxy
import scala.collection.mutable.Map
import scala.collection.mutable.HashMap
trait MonadicTupleSpace[Place,Pattern,Resource]
// extends MapLike[Place,Resource, This]
extends MonadicGenerators with FJTaskRunners
{
self : WireTap with Journalist =>
type RK = Option[Resource] => Unit @suspendable
//type CK = Option[Resource] => Unit @suspendable
type Substitution <: Function1[Resource,Option[Resource]]
case class IdentitySubstitution( )
extends Function1[Resource,Option[Resource]] {
override def apply( rsrc : Resource ) = Some( rsrc )
}
case class PlaceInstance(
place : Place,
stuff : Either[Resource,List[RK]],
subst : Substitution
)
def theMeetingPlace : Map[Place,Resource]
def theChannels : Map[Place,Resource]
def theWaiters : Map[Place,List[RK]]
def theSubscriptions : Map[Place,List[RK]]
def fits( ptn : Pattern, place : Place ) : Boolean
def fitsK( ptn : Pattern, place : Place ) : Option[Substitution]
def representative( ptn : Pattern ) : Place
//def self = theMeetingPlace
override def itergen[T]( coll : Iterable[T] ) =
Generator {
gk : ( T => Unit @suspendable ) =>
val collItr = coll.iterator
while( collItr.hasNext ) {
gk( collItr.next )
}
}
def locations(
map : Either[Map[Place,Resource],Map[Place,List[RK]]],
ptn : Pattern
) : List[PlaceInstance] = {
def lox[Trgt,ITrgt](
m : Map[Place,Trgt],
inj : Trgt => ITrgt
) : List[(Place,ITrgt,Substitution)]
= {
( ( Nil : List[(Place,ITrgt,Substitution)] ) /: m )(
{
( acc, kv ) => {
val ( k, v ) = kv
fitsK( ptn, k ) match {
case Some( s ) => acc ++ List[(Place,ITrgt,Substitution)]( ( k, inj( v ), s ) )
case None => acc
}
}
}
)
}
val triples =
map match {
case Left( m ) => {
lox[Resource,Either[Resource,List[RK]]](
m, ( r ) => Left[Resource,List[RK]]( r )
)
}
case Right( m ) => {
lox[List[RK],Either[Resource,List[RK]]](
m, ( r ) => Right[Resource,List[RK]]( r )
)
}
}
triples.map(
( t ) => {
val ( p, e, s ) = t
PlaceInstance( p, e, s )
}
)
}
// val reportage = report( Luddite() ) _
def mget(
channels : Map[Place,Resource],
registered : Map[Place,List[RK]],
consume : Boolean
)( ptn : Pattern )
: Generator[Option[Resource],Unit,Unit] =
Generator {
rk : ( Option[Resource] => Unit @suspendable ) =>
shift {
outerk : ( Unit => Unit ) =>
reset {
val map = Left[Map[Place,Resource],Map[Place,List[RK]]]( channels )
val meets = locations( map, ptn )
if ( meets.isEmpty ) {
val place = representative( ptn )
tweet( "did not find a resource, storing a continuation: " + rk )
registered( place ) =
registered.get( place ).getOrElse( Nil ) ++ List( rk )
rk( None )
}
else {
for(
placeNRrscNSubst <- itergen[PlaceInstance](
meets
)
) {
val PlaceInstance( place, Left( rsrc ), s ) = placeNRrscNSubst
tweet( "found a resource: " + rsrc )
if ( consume ) {
channels -= place
}
rk( s( rsrc ) )
//shift { k : ( Unit => Unit ) => k() }
}
}
tweet( "get returning" )
outerk()
}
}
}
def get( ptn : Pattern ) =
mget( theMeetingPlace, theWaiters, true )( ptn )
def fetch( ptn : Pattern ) =
mget( theMeetingPlace, theWaiters, false )( ptn )
def subscribe( ptn : Pattern ) =
mget( theChannels, theSubscriptions, true )( ptn )
def putPlaces(
channels : Map[Place,Resource],
registered : Map[Place,List[RK]],
ptn : Pattern,
rsrc : Resource
)
: Generator[PlaceInstance,Unit,Unit] = {
Generator {
k : ( PlaceInstance => Unit @suspendable ) =>
// Are there outstanding waiters at this pattern?
val map = Right[Map[Place,Resource],Map[Place,List[RK]]]( registered )
val waitlist = locations( map, ptn )
waitlist match {
// Yes!
case waiter :: waiters => {
tweet( "found waiters waiting for a value at " + ptn )
val itr = waitlist.toList.iterator
while( itr.hasNext ) {
k( itr.next )
}
}
// No...
case Nil => {
// Store the rsrc at a representative of the ptn
tweet( "no waiters waiting for a value at " + ptn )
channels( representative( ptn ) ) = rsrc
}
}
}
}
def mput(
channels : Map[Place,Resource],
registered : Map[Place,List[RK]],
consume : Boolean
)( ptn : Pattern, rsrc : Resource ) : Unit @suspendable = {
for( placeNRKsNSubst <- putPlaces( channels, registered, ptn, rsrc ) ) {
val PlaceInstance( wtr, Right( rks ), s ) = placeNRKsNSubst
tweet( "waiters waiting for a value at " + wtr + " : " + rks )
rks match {
case rk :: rrks => {
if ( consume ) {
for( sk <- rks ) {
spawn {
sk( s( rsrc ) )
}
}
}
else {
registered( wtr ) = rrks
rk( s( rsrc ) )
}
}
case Nil => {
channels( wtr ) = rsrc
}
}
}
}
def put( ptn : Pattern, rsrc : Resource ) =
mput( theMeetingPlace, theWaiters, false )( ptn, rsrc )
def publish( ptn : Pattern, rsrc : Resource ) =
mput( theChannels, theSubscriptions, true )( ptn, rsrc )
}
import java.util.regex.{Pattern => RegexPtn, Matcher => RegexMatcher}
object MonadicTSpace
extends MonadicTupleSpace[String,String,String]
with WireTap
with Journalist
with ConfiggyReporting
with ConfiggyJournal
{
override type Substitution = IdentitySubstitution
override val theMeetingPlace = new HashMap[String,String]()
override val theChannels = new HashMap[String,String]()
override val theWaiters = new HashMap[String,List[RK]]()
override val theSubscriptions = new HashMap[String,List[RK]]()
override def tap [A] ( fact : A ) : Unit = {
reportage( fact )
}
def representative( ptn : String ) : String = {
ptn
}
def fits( ptn : String, place : String ) : Boolean = {
RegexPtn.matches( ptn, place ) || RegexPtn.matches( place, ptn )
}
def fitsK(
ptn : String,
place : String
) : Option[Substitution] = {
if ( fits( ptn, place ) ) {
Some( IdentitySubstitution() )
}
else {
None
}
}
}