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#############################################################################
##
#W remote.gi The SCSCP package Olexandr Konovalov
#W Steve Linton
##
#############################################################################
DeclareRepresentation( "IsRemoteObjectRep",
IsPositionalObjectRep,
[ ] );
RemoteObjectDefaultType :=
NewType( RemoteObjectsFamily,
IsRemoteObjectRep and IsRemoteObject);
#############################################################################
##
## RemoteObject( <identifier>, <hostname>, <port> )
##
## RemoteObject should contain all information that is necessary
## to retrieve it from the remote system
##
InstallGlobalFunction( RemoteObject, function( identifier, hostname, port )
local pos;
if IsString(identifier) and IsString(hostname) and IsPosInt(port) then
pos := PositionNthOccurrence( identifier, '/', 3);
if pos <> fail then
identifier := identifier{[pos+1..Length(identifier)]};
fi;
return Objectify( RemoteObjectDefaultType,
[ identifier, hostname, port ] );
else
Error( "RemoteObject( <identifier>, <hostname>, <port> ) : \n",
"1st and 2nd argument must be strings, and 3rd a positive integer \n" );
fi;
end);
#############################################################################
##
#M \=( <x>, <y> ) . . . . . . . . . . . . . . . . . for two remote objects
##
## We decide that two remote objects are equal if they have the same
## internal representation (variable name, server and port).
##
InstallMethod( \=,
"for two remote objects",
IsIdenticalObj,
[ IsRemoteObjectRep and IsRemoteObject, IsRemoteObjectRep and IsRemoteObject ],
function( a, b )
return a![1] = b![1] and a![2] = b![2] and a![3] = b![3];
end );
#############################################################################
##
#M ViewObj( <RemoteObject> )
##
InstallMethod( ViewObj, "for RemoteObject",
[ IsRemoteObjectRep and IsRemoteObject ],
function( obj )
Print("< remote object scscp://", obj![2], ":", obj![3], "/", obj![1], " >");
end);
#############################################################################
##
#M PrintObj( <RemoteObject> )
##
InstallMethod( PrintObj, "for RemoteObject",
[ IsRemoteObjectRep and IsRemoteObject ],
function( obj )
Print("RemoteObject(\"", obj![1], "\",\"", obj![2], "\",", obj![3], ")" );
end);
#############################################################################
##
#M OMPut( <RemoteObject> )
##
InstallMethod( OMPut, "for OpenMath XML writer and RemoteObject",
[ IsOpenMathXMLWriter, IsRemoteObjectRep and IsRemoteObject ],
function ( writer, x )
OMWriteLine( writer![1], [ "<OMR href=\"scscp://", x![2], ":", x![3], "/", x![1], "\" />" ] );
# Writing references in the form <OMR href= "scscp:// server : port / name " />
return;
end);
#############################################################################
##
#M OMPut( <RemoteObject> )
##
InstallMethod( OMPut, "for OpenMath binary writer and RemoteObject",
[ IsOpenMathBinaryWriter, IsRemoteObjectRep and IsRemoteObject ],
function ( writer, x )
local refStri, refLength, lengthList;
# Error("IN!!!\n");
# OMWriteLine( writer![1], [ "<OMR href=\"scscp://", x![2], ":", x![3], "/", x![1], "\" />" ] );
# Writing references in the form <OMR href= "scscp:// server : port / name " />
refStri := Concatenation( "scscp://", x![2], ":", String(x![3]), "/", x![1] );
refLength := Length(refStri);
if refLength > 255 then
WriteByte (writer![1], 159); #31+128
lengthList := BigIntToListofInts(refLength);
WriteIntasBytes(writer![1], lengthList);
else
WriteByte (writer![1], 31);
WriteByte (writer![1], refLength);
fi;
WriteAll(writer![1], refStri);
return;
end);
#############################################################################
##
## StoreAsRemoteObjectPerSession( <Object>, <server>, <port> )
##
InstallMethod( StoreAsRemoteObjectPerSession, "for an object",
[ IsObject, IsString, IsPosInt ],
function( obj, server, port )
return EvaluateBySCSCP( "store_session", [ obj ], server, port : output := "cookie" ).object;
end);
#############################################################################
##
## StoreAsRemoteObjectPersistently( <Object>, <server>, <port> )
##
InstallMethod( StoreAsRemoteObjectPersistently, "for an object",
[ IsObject, IsString, IsPosInt ],
function( obj, server, port )
return EvaluateBySCSCP( "store_persistent", [ obj ], server, port : output:="cookie").object;
end);
#############################################################################
##
## RetrieveRemoteObject( <RemoteObject> )
##
InstallMethod( RetrieveRemoteObject, "for remote object",
[ IsRemoteObject ],
function( obj )
return EvaluateBySCSCP( "retrieve", [ obj ], obj![2], obj![3] : output:="object" ).object;
end);
#############################################################################
##
## UnbindRemoteObject( <RemoteObject> )
##
InstallMethod( UnbindRemoteObject, "for remote object",
[ IsRemoteObject ],
function( obj )
local r;
if IsBound( obj![4]) and obj![4]=false then
Error("Remote object is already unbound");
else
r := EvaluateBySCSCP( "unbind", [ obj ], obj![2], obj![3] : output:="object" ).object;
if r=true then
obj![4]:=false;
fi;
return true;
fi;
end);
###########################################################################
##
#E
##
|
