Annotation of parser3/src/include/pa_stylesheet_connection.h, revision 1.25
1.1 parser 1: /** @file
1.7 parser 2: Parser: Stylesheet connection decl.
1.1 parser 3:
1.25 ! paf 4: Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
1.16 paf 5: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1 parser 6:
1.25 ! paf 7: $Id: pa_stylesheet_connection.h,v 1.24 2002/01/23 12:19:56 paf Exp $
1.1 parser 8: */
9:
10: #ifndef PA_STYLESHEET_CONNECTION_H
11: #define PA_STYLESHEET_CONNECTION_H
12:
1.22 paf 13: #include "libxslt/xslt.h"
1.18 paf 14: #include "libxslt/xsltInternals.h"
15:
1.1 parser 16: #include "pa_pool.h"
1.14 parser 17: #include "pa_stylesheet_manager.h"
1.1 parser 18: #include "pa_exception.h"
19: #include "pa_common.h"
1.9 parser 20:
1.1 parser 21: // defines
22:
23: #define STYLESHEET_FILENAME_STAMP_SUFFIX ".stamp"
24:
25: /** Connection with stylesheet:
26: remembers time and can figure out that it needs recompilation
27: */
28: class Stylesheet_connection : public Pooled {
29:
1.19 paf 30: friend class Stylesheet_connection_ptr;
31:
1.1 parser 32: public:
33:
34: Stylesheet_connection(Pool& pool, const String& afile_spec) : Pooled(pool),
35: ffile_spec(afile_spec),
36: prev_disk_time(0),
1.3 parser 37: fservices_pool(0),
1.19 paf 38: fstylesheet(0),
39: time_used(0), used(0) {
1.1 parser 40: }
41:
42: const String& file_spec() { return ffile_spec; }
43:
44: void set_services(Pool *aservices_pool) {
45: fservices_pool=aservices_pool;
46: }
47: bool expired(time_t older_dies) {
1.19 paf 48: return !used && time_used<older_dies;
1.1 parser 49: }
1.15 paf 50: time_t get_time_used() { return time_used; }
1.1 parser 51:
52: void disconnect() {
1.18 paf 53: xsltFreeStylesheet(fstylesheet); fstylesheet=0;
1.1 parser 54: }
55:
56: bool connected() { return fstylesheet!=0; }
57:
1.18 paf 58: xsltStylesheet *stylesheet(bool nocache) {
1.6 parser 59: time_t new_disk_time=get_new_disk_time();
60: if(nocache || new_disk_time)
1.1 parser 61: load(new_disk_time);
1.18 paf 62: return fstylesheet;
1.1 parser 63: }
64:
65: private:
66:
1.19 paf 67: /// return to cache
68: void close() {
69: stylesheet_manager->close_connection(ffile_spec, *this);
70: }
71:
72: private:
73:
1.1 parser 74: time_t get_new_disk_time() {
75: time_t now_disk_time=get_disk_time();
76: return now_disk_time>prev_disk_time?now_disk_time:0;
77: }
78:
79: void load(time_t new_disk_time) {
80: Pool& pool=*fservices_pool;
81:
1.24 paf 82: xsltStylesheet *nstylesheet=
83: xsltParseStylesheetFile(BAD_CAST ffile_spec.cstr(String::UL_FILE_SPEC));
1.21 paf 84: if(!nstylesheet || xmlHaveGenericErrors()) {
1.20 paf 85: GdomeException exc=0;
1.18 paf 86: throw Exception(0, 0,
87: &ffile_spec,
1.20 paf 88: exc);
89: }
1.1 parser 90:
1.18 paf 91: xsltFreeStylesheet(fstylesheet);
92: fstylesheet=nstylesheet;
1.1 parser 93: prev_disk_time=new_disk_time;
94: }
95:
96: time_t get_disk_time() {
97: size_t size;
98: time_t atime, mtime, ctime;
99: String stamp_file_spec(ffile_spec);
100: stamp_file_spec << STYLESHEET_FILENAME_STAMP_SUFFIX;
1.3 parser 101: // {file_spec}.stamp modification time OR {file_spec}
102: const String& stat_file_spec=file_readable(stamp_file_spec)?stamp_file_spec:ffile_spec;
1.14 parser 103: file_stat(stat_file_spec,
1.1 parser 104: size,
105: atime, mtime, ctime,
1.14 parser 106: true/*exception on error*/);
1.1 parser 107: return mtime;
108: }
109:
1.19 paf 110: private: // connection usage methods
111:
112: void use() {
113: time_used=time(0); // they started to use at this time
114: used++;
115: }
116: void unuse() {
117: used--;
118: if(!used)
119: close();
120: }
121:
122: private: // connection usage data
123:
124: int used;
125:
1.1 parser 126: private:
127:
128: const String& ffile_spec;
1.18 paf 129: xsltStylesheet *fstylesheet;
1.1 parser 130: time_t time_used;
131: time_t prev_disk_time;
132:
133: private:
134:
135: Pool *fservices_pool;
1.14 parser 136:
137: private:
138: void *malloc(size_t size) { return fservices_pool->malloc(size); }
139: void *calloc(size_t size) { return fservices_pool->calloc(size); }
1.19 paf 140: };
141:
142: /// Auto-object used to track Stylesheet_connection usage
143: class Stylesheet_connection_ptr {
144: Stylesheet_connection *fconnection;
145: public:
146: explicit Stylesheet_connection_ptr(Stylesheet_connection *aconnection) :
147: fconnection(aconnection) {
148: fconnection->use();
149: }
150: ~Stylesheet_connection_ptr() {
151: fconnection->unuse();
152: }
153: Stylesheet_connection* operator->() {
154: return fconnection;
155: }
156:
157: // copying
158: Stylesheet_connection_ptr(const Stylesheet_connection_ptr& src) : fconnection(src.fconnection) {
159: fconnection->use();
160: }
161: Stylesheet_connection_ptr& operator =(const Stylesheet_connection_ptr& src) {
162: // may do without this=src check
163: fconnection->unuse();
164: fconnection=src.fconnection;
165: fconnection->use();
166:
167: return *this;
168: }
1.1 parser 169: };
170:
171: #endif
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