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// Copyright (C) 1995 The New York Group Theory Cooperative
// See magnus/doc/COPYRIGHT for the full notice.
// Contents: Declaration of class TheObjects
//
// Principal Author: Roger Needham
//
// Status: in progress
//
// Revision History:
//
#ifndef _THEOBJECTS_H_
#define _THEOBJECTS_H_
#include "Set.h"
#include "Associations.h"
#include "Chars.h"
//---------------------------------------------------------------------------//
//--------------------------- TheObjects ------------------------------------//
//---------------------------------------------------------------------------//
class TheObjects
{
public:
/////////////////////////////////////////////////////////////////////////
// //
// Constructors: //
// //
/////////////////////////////////////////////////////////////////////////
// No constructors for this static class.
/////////////////////////////////////////////////////////////////////////
// //
// Accessors: //
// //
/////////////////////////////////////////////////////////////////////////
static bool isRunning(OID oid);
// True iff oid is the OID of a ComputationManager which is in
// state RUNNING.
static bool isStalled(OID oid);
// Returns true when no running CM has any ARCs from oid.
static SetOf<OID> remove(OID oid);
// Removes and deletes the indicated SMObject, and all of its dependents.
// A bad oid is quietly ignored, for messaging fault-tolerance.
// Returns the dependency closure of oid, i.e., the objects which were
// deleted.
static SMObject* get(OID oid);
// Returns the SMObject* with the given oid,
// or 0 if there is no such object, for messaging fault-tolerance.
// Used by class SessionManager and class Ctor.
static SetOf<OID> dependencyClosure(OID oid);
// A bad oid is quietly ignored, for messaging fault-tolerance.
static Chars name(OID oid);
// Returns name of the object with the given oid
private:
/////////////////////////////////////////////////////////////////////////
// //
// `Public' Members Touched by Friends: //
// //
/////////////////////////////////////////////////////////////////////////
friend class SMObject;
friend class SessionManager;
friend class Ctor;
friend class UnboundedSupervisor;
friend class ResourceManager;
friend class ExtendToHomProblem; //@db temporary hack
static OID reserveOid( );
// Reserves a place in theObjects for a new SMObject, and returns the index.
// Used by class SMObject to prepare for enrollment.
static void enroll(SMObject* newObject);
// Used by class SMObject.
static void passControl( );
// Passes control to a ComputationManager in a fair way.
static void setName(OID oid, Chars name);
// Changes name of an object
/////////////////////////////////////////////////////////////////////////
// //
// Private Members: //
// //
/////////////////////////////////////////////////////////////////////////
static void resize(int newLength);
// A helper for expanding theObjects.
/////////////////////////////////////////////////////////////////////////
// //
// Data Members: //
// //
/////////////////////////////////////////////////////////////////////////
static const int minimumLength = 16;
static int theObjectsLength;
static SMObject** theObjects;
static int CMToGetControl;
// keeps a copy of the names of the objects for SM use
static AssociationsOf<OID,Chars>* theNames;
};
#endif
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