aboutsummaryrefslogtreecommitdiff
path: root/src/plugger.h
blob: 2124b7af82db5a49cf20368591edad91b865bc06 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
#ifndef BU_PLUGGER_H
#define BU_PLUGGER_H


#include "bu/hash.h"
#include "bu/list.h"
#include <dlfcn.h>
#include "bu/exceptions.h"
#include "bu/fstring.h"

namespace Bu
{
	typedef struct PluginInfo
	{
		const char *sID;
		const char *sAuthor;
		unsigned short nVersion;
		unsigned short nRevision;
		void *(*createPlugin)();
		void (*destroyPlugin)( void * );
	} PluginInfo;

	typedef struct PluginReg
	{
		bool bBuiltin;
		void *dlHandle;
		PluginInfo *pInfo;
	} PluginReg;

#define PluginInterface( classname, baseclass, name, ver, rev )			\
	extern "C" {															\
		baseclass *create ##classname()								\
		{																	\
			return new classname();											\
		}																	\
		void destroy ##classname( baseclass *pCls )					\
		{																	\
			delete pCls;													\
		}																	\
		Bu::PluginInfo classname = {						\
			#classname, name, ver, rev,										\
			create ##classname, destroy ##classname };						\
	}

#define PluginInterface2( pluginname, classname, baseclass, name, ver, rev ) \
	extern "C" {															\
		baseclass *create ##classname()										\
		{																	\
			return new classname();											\
		}																	\
		void destroy ##classname( baseclass *pCls )							\
		{																	\
			delete pCls;													\
		}																	\
		Bu::PluginInfo pluginname = {											\
			#pluginname, name, ver, rev,									\
			(void *(*)())(create ##classname),								\
			(void (*)( void * ))(destroy ##classname) };					\
	}

#define PluginInterface3( structname, pluginname, classname, baseclass, name, ver, rev ) \
	extern "C" {															\
		baseclass *create ##classname()										\
		{																	\
			return new classname();											\
		}																	\
		void destroy ##classname( baseclass *pCls )							\
		{																	\
			delete pCls;													\
		}																	\
		Bu::PluginInfo structname = {											\
			#pluginname, name, ver, rev,									\
			(void *(*)())(create ##classname),								\
			(void (*)( void * ))(destroy ##classname) };					\
	}

	template<class T>
	class Plugger
	{
	public:
		typedef Bu::Hash<Bu::FString, PluginReg *> PluginHash;
		typedef Bu::Hash<int, void *> InstHash;

	public:
		Plugger()
		{
		}

		virtual ~Plugger()
		{
			for( InstHash::iterator i = hObj.begin(); i != hObj.end(); i++ )
			{
				T *pPlug = (T *)i.getKey();
				PluginReg *pReg = (PluginReg *)*i;
				pReg->pInfo->destroyPlugin( pPlug );
			}

			for( PluginHash::iterator i = hPlugin.begin();
				 i != hPlugin.end(); i++ )
			{
				if( (*i)->bBuiltin == false )
				{
					dlclose( (*i)->dlHandle );
				}
				delete (*i);
			}
		}

		void registerBuiltinPlugin( PluginInfo *pInfo )
		{
			PluginReg *pReg = new PluginReg;
			pReg->bBuiltin = true;
			pReg->pInfo = pInfo;
			hPlugin.insert( pInfo->sID, pReg );
		}

		void registerExternalPlugin( const char *sFName, const char *sPluginName )
		{
			PluginReg *pReg;
			try {
				pReg = (PluginReg *)hPlugin[sPluginName];
				hPlugin.erase( sPluginName );
				dlclose( pReg->dlHandle );
				delete pReg;
				pReg = NULL;
			} catch( Bu::HashException &e )
			{
			}

			pReg = new PluginReg;

			pReg->bBuiltin = false;
			pReg->dlHandle = dlopen( sFName, RTLD_NOW );
			if( pReg->dlHandle == NULL )
			{
				throw PluginException( 1, "Error on %s: %s", sFName, dlerror() );
			}
			pReg->pInfo = (PluginInfo *)dlsym( pReg->dlHandle, sPluginName );
			if( pReg->pInfo == NULL )
			{
				throw PluginException( 2, "Error on %s: %s", sFName, dlerror() );
			}
			hPlugin.insert( pReg->pInfo->sID, pReg );
		}

		T *instantiate( const char *lpName )
		{
			PluginReg *pReg = (PluginReg *)hPlugin[lpName];
			if( pReg == NULL )
				return NULL;

			T *p = (T *)pReg->pInfo->createPlugin();
			hObj.insert( (int )p, pReg );
			//printf("pReg:  %08X, pPlug: %08X\n", pReg, p );
		
			return p;
		}

		bool hasPlugin( const char *lpName )
		{
			if( hPlugin[lpName] == NULL )
				return false;
			return true;
		}

		void destroy( T *pPlug )
		{
			PluginReg *pReg = (PluginReg *)hObj.get((int)pPlug);
			//printf("pReg:  %08X, pPlug: %08X\n", pReg, pPlug );
			if( pReg == NULL )
				return;

			pReg->pInfo->destroyPlugin( pPlug );

			hObj.erase( (int)pPlug );
		}

		void unloadAll()
		{
			for( PluginHash::iterator i = hPlugin.begin();
				 i != hPlugin.end(); i++ )
			{
				if( (*i)->bBuiltin == false )
				{
					dlclose( (*i)->dlHandle );
				}
				delete (*i);
			}
			hPlugin.clear();
		}

	private:
		PluginHash hPlugin;
		InstHash hObj;
	};
}

#endif