Annotation of parser3/src/include/pa_pool.h, revision 1.72
1.34 paf 1: /** @file
1.36 paf 2: Parser: pool class decl.
3:
1.27 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.36 paf 5:
1.69 paf 6: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.27 paf 7:
1.72 ! paf 8: $Id: pa_pool.h,v 1.71 2001/11/16 11:51:32 paf Exp $
1.1 paf 9: */
10:
11: #ifndef PA_POOL_H
12: #define PA_POOL_H
13:
1.52 parser 14: #include "pa_config_includes.h"
1.1 paf 15:
1.59 parser 16: #ifdef XML
1.66 parser 17: #include <memory>
1.55 parser 18: #include <XalanDOM/XalanDOMString.hpp>
19: #include <util/TransService.hpp>
1.59 parser 20: #endif
1.55 parser 21:
22: // forwards
23:
1.21 paf 24: class Exception;
1.55 parser 25: class String;
26:
1.35 paf 27: /**
1.34 paf 28: Pool mechanizm allows users not to free up allocated memory,
29: leaving that problem to 'pools'.
30:
1.38 paf 31: @see Pooled
1.34 paf 32: */
1.47 paf 33:
1.1 paf 34: class Pool {
35: public:
1.18 paf 36:
1.55 parser 37: Pool(void *astorage);
1.56 parser 38: ~Pool();
1.18 paf 39:
1.70 paf 40: ///{@ statistics
41: size_t total_allocated() { return ftotal_allocated; }
42: unsigned int total_times() { return ftotal_times; }
43: ///}@
44:
1.40 paf 45: void set_context(void *acontext) { fcontext=acontext; }
1.64 parser 46: void *get_context() { return fcontext; }
1.39 paf 47:
1.34 paf 48: /// allocates some bytes on pool
1.68 paf 49: void *malloc(size_t size, int place=0) {
50: return check(real_malloc(size, place), size);
1.18 paf 51: }
1.34 paf 52: /// allocates some bytes clearing them with zeros
1.18 paf 53: void *calloc(size_t size) {
54: return check(real_calloc(size), size);
55: }
1.39 paf 56:
1.53 parser 57: /// registers a routine to clean up non-pooled allocations
1.54 parser 58: void register_cleanup(void (*cleanup) (void *), void *data) {
59: if(!real_register_cleanup(cleanup, data))
60: fail_register_cleanup();
61: }
1.53 parser 62:
1.60 parser 63: /// resets transcoder if they change charset
64: void set_charset(const String &charset);
65: /// returns current charset
66: const String& get_charset() { return *charset; }
67:
1.39 paf 68: private:
69:
70: void *fstorage;
1.40 paf 71: void *fcontext;
1.60 parser 72: const String *charset;
1.8 paf 73:
1.50 parser 74: private:
75:
76: //{
77: /// @name implementation defined
1.68 paf 78: void *real_malloc(size_t size, int place);
1.20 paf 79: void *real_calloc(size_t size);
1.54 parser 80: bool real_register_cleanup(void (*cleanup) (void *), void *data);
1.50 parser 81: //}
1.17 paf 82:
1.23 paf 83: private:
1.17 paf 84:
1.34 paf 85: /// checks whether mem allocated OK. throws exception otherwise
1.23 paf 86: void *check(void *ptr, size_t size) {
1.70 paf 87: if(ptr) {
88: ftotal_allocated+=size;
89: ftotal_times++;
1.23 paf 90: return ptr;
1.70 paf 91: }
1.23 paf 92:
1.54 parser 93: fail_alloc(size);
1.23 paf 94:
95: // never reached
96: return 0;
97: }
1.54 parser 98: /// throws allocation exception
99: void fail_alloc(size_t size) const;
100:
101: /// throws register cleanup exception
102: void fail_register_cleanup() const;
1.23 paf 103:
1.59 parser 104: #ifdef XML
105:
106: public:
107: /// converts Xalan string to char *
108: const char *transcode_cstr(const XalanDOMString& s);
109: /// converts Xalan string to parser String
110: String& transcode(const XalanDOMString& s);
1.63 parser 111: /// converts char * to Xalan string
1.67 parser 112: std::auto_ptr<XalanDOMString> transcode_buf(const char *buf, size_t buf_size);
1.63 parser 113: /// converts parser String to Xalan string
1.65 parser 114: std::auto_ptr<XalanDOMString> transcode(const String& s);
1.59 parser 115:
116: private:
117:
118: void update_transcoder();
119:
120: private:
121:
122: XMLTranscoder *transcoder;
123:
124: #endif
1.70 paf 125:
126: private: // statistics
127:
128: size_t ftotal_allocated;
129: unsigned int ftotal_times;
1.59 parser 130:
1.8 paf 131: private: //disabled
132:
1.64 parser 133: Pool(const Pool&);
134: Pool& operator= (const Pool&);
1.21 paf 135: };
136:
1.35 paf 137: /**
1.34 paf 138: Base for all classes that are allocated in 'pools'.
139:
140: Holds Pool object. Contains useful wrappers to it's methods.
1.38 paf 141:
1.64 parser 142: @see NEW
1.34 paf 143: */
1.21 paf 144: class Pooled {
1.23 paf 145: // the pool i'm allocated on
1.49 paf 146: Pool *fpool;
1.21 paf 147: public:
1.37 paf 148:
149: /// the Pooled-sole: Pooled instances can be allocated in Pool rather then on heap
1.21 paf 150: static void *operator new(size_t size, Pool& apool) {
1.68 paf 151: return apool.malloc(size, 1);
1.21 paf 152: }
153:
1.49 paf 154: Pooled(Pool& apool) : fpool(&apool) {}
1.23 paf 155:
1.34 paf 156: /// my pool
1.49 paf 157: Pool& pool() const { return *fpool; }
158:
159: /** used for moving objects from one pool to another.
160: in between object can have no pool and can not be used
161: @see SQL_Driver_manager
162: */
163: void set_pool(Pool *apool) { fpool=apool; }
1.21 paf 164:
1.57 parser 165: //{
166: /// @name useful wrapper around pool
1.68 paf 167: void *malloc(size_t size, int place=0) const { return fpool->malloc(size, place); }
1.49 paf 168: void *calloc(size_t size) const { return fpool->calloc(size); }
1.57 parser 169: void register_cleanup(void (*cleanup) (void *), void *data) { fpool->register_cleanup(cleanup, data); }
1.59 parser 170: #ifdef XML
1.57 parser 171: const char *transcode_cstr(const XalanDOMString& s) { return fpool->transcode_cstr(s); }
172: String& transcode(const XalanDOMString& s) { return fpool->transcode(s); }
1.59 parser 173: #endif
1.57 parser 174: //}
1.23 paf 175: };
1.34 paf 176: /// useful macro for creating objects on current Pooled object Pooled::pool()
1.23 paf 177: #define NEW new(pool())
1.1 paf 178:
179: #endif
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