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204 lines
11 KiB
C
204 lines
11 KiB
C
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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// % Project : GUSI - Grand Unified Socket Interface
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// % File : GUSIFactory.nw - Socket factories
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// % Author : Matthias Neeracher
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// % Language : C++
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// %
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// % $Log: GUSIFactory.h,v $
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// % Revision 1.1 2001/03/11 22:35:04 sgehani%netscape.com
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// % First Checked In.
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// %
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// % Revision 1.10 2000/05/23 07:00:00 neeri
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// % Improve formatting
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// %
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// % Revision 1.9 2000/03/15 07:22:07 neeri
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// % Enforce alignment choices
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// %
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// % Revision 1.8 1999/11/15 07:27:18 neeri
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// % Getting ready for GUSI 2.0.1
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// %
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// % Revision 1.7 1999/08/26 05:45:02 neeri
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// % Fixes for literate edition of source code
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// %
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// % Revision 1.6 1999/05/29 06:26:43 neeri
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// % Fixed header guards
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// %
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// % Revision 1.5 1998/11/22 23:06:53 neeri
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// % Releasing 2.0a4 in a hurry
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// %
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// % Revision 1.4 1998/10/25 11:37:37 neeri
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// % More configuration hooks
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// %
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// % Revision 1.3 1998/08/02 11:20:08 neeri
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// % Fixed some typos
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// %
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// % Revision 1.2 1998/01/25 20:53:54 neeri
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// % Engine implemented, except for signals & scheduling
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// %
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// % Revision 1.1 1996/12/16 02:12:40 neeri
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// % TCP Sockets sort of work
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// %
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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//
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// \chapter{Socket Factories}
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//
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// Instead of creating sockets of some specific subtype of [[GUSISocket]],
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// directly, we choose the more flexible approach of creating them in
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// some instance of a subtype of the abstract factory class [[GUSISocketFactory]].
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// For even more flexibility and a direct mapping to BSD socket domains,
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// [[GUSISocketFactory]] instances are collected in a [[GUSISocketDomainRegistry]].
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// If several types and or protocols in a domain are implemented, they are collected
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// in a [[GUSISocketTypeRegistry]].
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//
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// <GUSIFactory.h>=
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#ifndef _GUSIFactory_
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#define _GUSIFactory_
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#ifdef GUSI_SOURCE
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#include "GUSISocket.h"
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#include <ConditionalMacros.h>
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#if PRAGMA_STRUCT_ALIGN
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#pragma options align=native
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#endif
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// \section{Definition of [[GUSISocketFactory]]}
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//
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// [[GUSISocketFactory]] consists of a few maintenance functions and the socket
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// operations.
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//
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// <Definition of class [[GUSISocketFactory]]>=
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class GUSISocketFactory {
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public:
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virtual int socketpair(int domain, int type, int protocol, GUSISocket * s[2]);
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virtual GUSISocket * socket(int domain, int type, int protocol) = 0;
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protected:
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GUSISocketFactory() {}
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virtual ~GUSISocketFactory() {}
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};
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// \section{Definition of [[GUSISocketDomainRegistry]]}
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//
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// The [[GUSISocketDomainRegistry]] is a singleton class registering all socket
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// domains.
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//
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// <Definition of class [[GUSISocketDomainRegistry]]>=
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class GUSISocketDomainRegistry : public GUSISocketFactory {
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public:
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// The only instance of [[GUSISocketDomainRegistry]] is, as usual, obtained by calling
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// [[Instance]]. Calling [[socket]] on this instance will then create a socket.
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//
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// <Socket creation interface of [[GUSISocketDomainRegistry]]>=
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virtual GUSISocket * socket(int domain, int type, int protocol);
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virtual int socketpair(int domain, int type, int protocol, GUSISocket * s[2]);
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static GUSISocketDomainRegistry * Instance();
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// [[AddFactory]] and [[RemoveFactory]] add and remove a [[GUSISocketFactory]]
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// for a given domain number. Both return the previous registrant.
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//
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// <Registration interface of [[GUSISocketDomainRegistry]]>=
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GUSISocketFactory * AddFactory(int domain, GUSISocketFactory * factory);
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GUSISocketFactory * RemoveFactory(int domain);
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private:
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// <Privatissima of [[GUSISocketDomainRegistry]]>=
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static GUSISocketDomainRegistry * sInstance;
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// We store domain factories in a table that is quite comfortably sized.
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//
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// <Privatissima of [[GUSISocketDomainRegistry]]>=
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GUSISocketFactory * factory[AF_MAX];
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GUSISocketDomainRegistry();
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};
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// \section{Definition of [[GUSISocketTypeRegistry]]}
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//
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// A [[GUSISocketTypeRegistry]] registers factories for some domain by type and
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// protocol.
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//
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// <Definition of class [[GUSISocketTypeRegistry]]>=
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class GUSISocketTypeRegistry : public GUSISocketFactory {
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public:
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// [[GUSISocketTypeRegistry]] is not a singleton, but each instance is somewhat
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// singletonish in that it does some delayed initialization only when it's used
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// and at that point registers itself with the [[GUSISocketDomainRegistry]].
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// Calling [[socket]] on these instances will then create a socket.
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//
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// <Socket creation interface of [[GUSISocketTypeRegistry]]>=
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GUSISocketTypeRegistry(int domain, int maxfactory);
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virtual GUSISocket * socket(int domain, int type, int protocol);
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virtual int socketpair(int domain, int type, int protocol, GUSISocket * s[2]);
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// [[AddFactory]] and [[RemoveFactory]] add and remove a [[GUSISocketFactory]]
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// for a given type and protocol (both of which can be specified as 0 to match any
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// value). Both return the previous registrant.
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//
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// <Registration interface of [[GUSISocketTypeRegistry]]>=
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GUSISocketFactory * AddFactory(int type, int protocol, GUSISocketFactory * factory);
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GUSISocketFactory * RemoveFactory(int type, int protocol);
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private:
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// \section{Implementation of [[GUSISocketTypeRegistry]]}
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//
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// We store type factories in a fixed size table. This table is only
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// initialized when any non-constructor public member is called.
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//
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// <Privatissima of [[GUSISocketTypeRegistry]]>=
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struct Entry {
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int type;
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int protocol;
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GUSISocketFactory * factory;
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Entry() : type(0), protocol(0), factory(nil) {}
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};
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Entry * factory;
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int domain;
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int maxfactory;
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// [[Initialize]] initializes the table and registers the object with the
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// [[GUSISocketDomainRegistry]] the first time it's called.
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//
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// <Privatissima of [[GUSISocketTypeRegistry]]>=
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void Initialize();
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// Unlike for a [[GUSISocketDomainRegistry]], match identification for a
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// [[GUSISocketTypeRegistry]] takes a linear search. [[Find]] stops
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// when it has found either a match or an empty slot.
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//
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// <Privatissima of [[GUSISocketTypeRegistry]]>=
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bool Find(int type, int protocol, bool exact, Entry *&found);
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};
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#if PRAGMA_STRUCT_ALIGN
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#pragma options align=reset
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#endif
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// \section{Implementation of [[GUSISocketDomainRegistry]]}
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//
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// By now, you should know how singletons are created. Could it be that the
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// combination of Design Patterns and Literate Programming leads to a
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// proliferation of cliches?
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//
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// <Definition of [[GUSISetupFactories]] hook>=
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extern "C" void GUSISetupFactories();
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// <Inline member functions for class [[GUSISocketDomainRegistry]]>=
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inline GUSISocketDomainRegistry * GUSISocketDomainRegistry::Instance()
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{
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if (!sInstance) {
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sInstance = new GUSISocketDomainRegistry();
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GUSISetupFactories();
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}
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return sInstance;
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}
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// [[RemoveFactory]] can actually be implemented in terms of [[AddFactory]] but
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// that might confuse readers.
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//
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// <Inline member functions for class [[GUSISocketDomainRegistry]]>=
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inline GUSISocketFactory * GUSISocketDomainRegistry::RemoveFactory(int domain)
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{
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return AddFactory(domain, nil);
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}
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// <Inline member functions for class [[GUSISocketTypeRegistry]]>=
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inline GUSISocketTypeRegistry::GUSISocketTypeRegistry(int domain, int maxfactory)
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: domain(domain), maxfactory(maxfactory), factory(nil)
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{
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}
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#endif /* GUSI_SOURCE */
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#endif /* _GUSIFactory_ */
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