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DCCache.h

00001 /*
00002  * DCCache
00003  *
00004  * Copyright (C) 2001 Barnaby Gray <barnaby@beedesign.co.uk>
00005  *
00006  * This library is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * This library is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with this library; if not, write to the Free Software
00018  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
00019  *
00020  */
00021 
00022 #ifndef DCCACHE_H
00023 #define DCCACHE_H
00024 
00025 #include <libicq2000/Cache.h>
00026 
00027 #include <sigc++/signal_system.h>
00028 
00029 namespace ICQ2000 {
00030 
00031   /* fd -> DirectClient cache
00032    *
00033    * Where the party is at. Once a DirectClient object is added to the
00034    * cache MM for it is assumed on the cache. Also lookups for a
00035    * Contact are done in linear time now, it was just too much of a
00036    * head-ache maintaining the uin map in Client.
00037    */
00038   class DCCache : public Cache<int, DirectClient*> {
00039    public:
00040     DCCache() { }
00041     ~DCCache()
00042     {
00043       removeAll();
00044     }
00045 
00046     void removeItem(const DCCache::literator& l) {
00047       delete ((*l).getValue());
00048       Cache<int, DirectClient*>::removeItem(l);
00049     }
00050 
00051     void expireItem(const DCCache::literator& l) {
00052       expired.emit( (*l).getValue() );
00053       Cache<int, DirectClient*>::expireItem(l);
00054       /* this will removeItem(..), which'll delete the DirectClient
00055        * (see above).
00056        */
00057     }
00058 
00059     void removeContact(const ContactRef& c) {
00060       literator curr = m_list.begin();
00061       literator next = curr;
00062       while ( curr != m_list.end() ) {
00063         DirectClient *dc = (*curr).getValue();
00064         ++next;
00065         if ( dc->getContact().get() != NULL
00066              /* Direct Connections won't have a contact associated
00067               * with them initially just after having been accepted as
00068               * an incoming connection (we don't know who they are
00069               * yet) - so Contact could be a NULL ref.
00070               */
00071              && dc->getContact()->getUIN() == c->getUIN() ) {
00072           removeItem(curr);
00073         }
00074         curr = next;
00075       }
00076     }
00077 
00078     DirectClient* getByContact(const ContactRef& c)
00079     {
00080       // linear lookup
00081       literator curr = m_list.begin();
00082       while ( curr != m_list.end() ) {
00083         DirectClient *dc = (*curr).getValue();
00084         if (  dc->getContact().get() != NULL
00085              /* Direct Connections won't have a contact associated
00086               * with them initially just after having been accepted as
00087               * an incoming connection (we don't know who they are
00088               * yet) - so Contact could be a NULL ref.
00089               */
00090              && dc->getContact()->getUIN() == c->getUIN() )
00091           return dc; // found it
00092 
00093         ++curr;
00094       }
00095 
00096       return NULL; // not found
00097     }
00098 
00099     void clearoutMessagesPoll() {
00100       literator curr = m_list.begin();
00101       while ( curr != m_list.end() ) {
00102         DirectClient *dc = (*curr).getValue();
00103         dc->clearoutMessagesPoll();
00104         ++curr;
00105       }
00106     }
00107 
00108     SigC::Signal1<void,DirectClient*> expired;
00109   };
00110   
00111 }
00112 
00113 #endif

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