Annotation of parser3/src/main/pa_db_table.C, revision 1.19
1.1 paf 1: /** @file
2: Parser: Charset table implementation.
3:
1.19 ! paf 4: Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
1.11 paf 5: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1 paf 6:
1.19 ! paf 7: $Id: pa_db_table.C,v 1.18 2002/01/24 17:18:49 paf Exp $
1.1 paf 8: */
9:
10: #include "pa_config_includes.h"
1.5 paf 11: #ifdef DB2
1.1 paf 12:
13: #include "pa_db_table.h"
14: #include "pa_exception.h"
1.3 paf 15: #include "pa_db_connection.h"
1.10 paf 16: #include "pa_threads.h"
1.1 paf 17:
18: // defines
19:
1.7 paf 20: #ifdef DB_RMW
1.6 paf 21: # define DEADLOCK_POSSIBILITY_REDUCTION_FLAGS DB_RMW
22: #else
23: # define DEADLOCK_POSSIBILITY_REDUCTION_FLAGS 0
24: #endif
1.1 paf 25:
26: // consts
27:
1.14 paf 28: const int DATA_STRING_SERIALIZED_VERSION=0x0002;
1.1 paf 29:
30: // helper types
31:
32: #ifndef DOXYGEN
33: struct Data_string_serialized_prolog {
34: int version;
1.14 paf 35: time_t time_of_creating;
36: time_t lifespan;
1.1 paf 37: };
1.3 paf 38:
39: struct DBT_auto : public DBT {
40: DBT_auto() {
41: data=0;
42: size=ulen=dlen=doff=0;
43: flags=DB_DBT_MALLOC;
44: }
45:
46: ~DBT_auto() {
47: if(flags & DB_DBT_MALLOC)
48: free(data);
49: }
50: };
51:
1.1 paf 52: #endif
53:
54: // DB_Table
55:
1.3 paf 56: DB_Table::DB_Table(Pool& pool, const String& afile_name, DB_Connection& aconnection) : Pooled(pool),
1.16 paf 57: time_used(0),
1.1 paf 58: fconnection(aconnection),
59: dbenv(aconnection.dbenv),
1.3 paf 60: ffile_name(afile_name), file_name_cstr(afile_name.cstr(String::UL_FILE_SPEC)),
1.11 paf 61: db(0), used(0) {
1.3 paf 62:
63: // open
64: DB_INFO dbinfo;
65: memset(&dbinfo, 0, sizeof(dbinfo));
66: check("open/create", &ffile_name, db_open(
67: file_name_cstr,
68: PA_DB_ACCESS_METHOD,
1.12 paf 69: (parser_multithreaded?DB_THREAD:0)
1.10 paf 70: | DB_CREATE,
1.14 paf 71: 0664,
1.3 paf 72: &dbenv, &dbinfo, &db));
73: }
74: /// @todo this one of reasons of not having ^try for now
75: DB_Table::~DB_Table() {
76: // close
77: check("close", &ffile_name, db->close(db, 0/*flags*/)); db=0;
78: }
79:
80: void DB_Table::use() {
81: fconnection.use();
82:
83: time_used=time(0); // they started to use at this time
84: used++;
85: }
86: void DB_Table::unuse() {
87: used--;
88:
89: fconnection.unuse();
1.1 paf 90: }
91:
1.3 paf 92:
93:
1.1 paf 94: void DB_Table::check(const char *operation, const String *source, int error) {
95: switch(error) {
96: case 0:
97: // no error
98: break;
99:
100: case DB_KEYEXIST:
101: // DB_KEYEXIST is a "normal" return, so should not be
102: // thrown as an error
103: break;
104:
1.6 paf 105: #ifdef DB_RUNRECOVERY
1.1 paf 106: case DB_RUNRECOVERY:
107: throw Exception(0, 0,
108: source,
109: "action failed, RUN RECOVERY UTILITY. db %s error, real filename '%s'",
1.3 paf 110: operation, file_name_cstr);
1.6 paf 111: #endif
112:
1.1 paf 113: default:
1.8 paf 114: if(error<0)
115: throw Exception(0, 0,
116: source,
117: "action failed. db %s error: %d, real filename '%s'",
118: operation, error, file_name_cstr);
119: else
120: throw Exception(0, 0,
121: source,
122: "action failed. db %s error: %s (%d), real filename '%s'",
123: operation, strerror(error), error, file_name_cstr);
1.1 paf 124: }
125: }
126:
127: void DB_Table::key_string_to_dbt(const String& key_string, DBT& key_result) {
128: memset(&key_result, 0, sizeof(key_result));
1.9 paf 129: key_result.data=key_string.cstr();
1.1 paf 130: key_result.size=key_string.size();
131: }
132:
1.3 paf 133: String& DB_Table::key_dbt_to_string(Pool& pool, const DBT& key_dbt) {
1.16 paf 134: String& result=*new(pool) String(pool);
1.1 paf 135: if(key_dbt.size) {
1.3 paf 136: char *request_data=(char *)pool.malloc(key_dbt.size);
1.1 paf 137: memcpy(request_data, key_dbt.data, key_dbt.size);
1.3 paf 138: result.APPEND_TAINTED(request_data, key_dbt.size, file_name_cstr, 0/*line*/);
1.1 paf 139: }
140: return result;
141: }
142:
1.14 paf 143: void DB_Table::data_string_to_dbt(const String& data_string, time_t lifespan,
1.1 paf 144: DBT& data_result) {
145: memset(&data_result, 0, sizeof(data_result));
146:
147: data_string.serialize(
148: sizeof(Data_string_serialized_prolog),
149: data_result.data, data_result.size);
150:
151: Data_string_serialized_prolog& prolog=
152: *static_cast<Data_string_serialized_prolog *>(data_result.data);
153:
154: prolog.version=DATA_STRING_SERIALIZED_VERSION;
1.14 paf 155: prolog.time_of_creating=time(0)/*now*/;
156: prolog.lifespan=lifespan;
1.1 paf 157: }
158:
1.14 paf 159: String *DB_Table::data_dbt_to_string(Pool& pool, const DBT& data_dbt, time_t lifespan) {
1.1 paf 160: Data_string_serialized_prolog& prolog=
161: *static_cast<Data_string_serialized_prolog *>(data_dbt.data);
162:
163: if(prolog.version!=DATA_STRING_SERIALIZED_VERSION)
164: throw Exception(0, 0,
1.3 paf 165: &ffile_name,
1.1 paf 166: "data string version 0x%04X not equal to 0x%04X, recreate file",
167: prolog.version, DATA_STRING_SERIALIZED_VERSION);
168:
1.14 paf 169: if(lifespan/*specified*/
170: && prolog.lifespan!=lifespan) // lifespan changed from storing to getting
171: return 0; // considering this 'expired'
172:
173: if(prolog.lifespan/*specified*/
174: && ((prolog.time_of_creating+prolog.lifespan) <= time(0)/*expired*/))
1.1 paf 175: return 0;
176:
1.3 paf 177: String& result=*new(pool) String(pool);
1.17 paf 178: if(data_dbt.size>sizeof(Data_string_serialized_prolog)) {
1.3 paf 179: char *data=(char *)pool.malloc(data_dbt.size);
180: memcpy(data, data_dbt.data, data_dbt.size);
181: result.deserialize(
182: sizeof(Data_string_serialized_prolog),
183: data, data_dbt.size, file_name_cstr);
184: }
1.1 paf 185: return &result;
186: }
187:
1.18 paf 188: void DB_Table::put(const String& key, const String& data, time_t time_to_die) {
1.1 paf 189: DBT dbt_key; key_string_to_dbt(key, dbt_key);
190: DBT dbt_data; data_string_to_dbt(data, time_to_die, dbt_data);
1.18 paf 191: check("put", &key, db->put(db, 0, &dbt_key, &dbt_data, 0/*flags*/));
1.1 paf 192: }
193:
1.18 paf 194: String *DB_Table::get(Pool& pool, const String& key, time_t lifespan) {
1.1 paf 195: DBT dbt_key; key_string_to_dbt(key, dbt_key);
1.3 paf 196: DBT_auto dbt_data;
1.18 paf 197: int error=db->get(db, 0, &dbt_key, &dbt_data,
1.3 paf 198: DEADLOCK_POSSIBILITY_REDUCTION_FLAGS);
1.1 paf 199: if(error==DB_NOTFOUND)
200: return 0;
201: else {
202: check("get", &key, error);
1.14 paf 203: String *result=data_dbt_to_string(pool, dbt_data, lifespan);
1.1 paf 204: if(!result) // save efforts by deleting expired keys
1.18 paf 205: check("del expired", &key, db->del(db, 0, &dbt_key, 0/*flags*/));
1.1 paf 206: return result;
207: }
208: }
209:
1.18 paf 210: void DB_Table::remove(const String& key) {
1.1 paf 211: DBT dbt_key; key_string_to_dbt(key, dbt_key);
212:
1.18 paf 213: int error=db->del(db, 0, &dbt_key, 0/*flags*/);
1.1 paf 214: if(error!=DB_NOTFOUND)
215: check("del", &key, error);
216: }
217:
218: // DB_Cursor
219:
220: DB_Cursor::DB_Cursor(
1.18 paf 221: DB_Table& atable,
1.3 paf 222: const String *asource) :
223: ftable(atable), fsource(asource),
224: cursor(0) {
225:
1.1 paf 226: check("cursor", fsource, ftable.db->cursor(ftable.db,
1.18 paf 227: 0, &cursor
1.6 paf 228: #if DB_VERSION_MINOR >= 7
229: , 0/*flags*/
230: #endif
231: ));
1.1 paf 232: }
233:
234: DB_Cursor::~DB_Cursor() {
1.3 paf 235: if(cursor)
236: check("c_close", fsource, cursor->c_close(cursor));
1.1 paf 237: }
238:
1.3 paf 239: bool DB_Cursor::get(Pool& pool, String *& key, String *& data, u_int32_t flags) {
1.1 paf 240: DBT dbt_key={0}; // must be zeroed
1.3 paf 241: DBT_auto dbt_data;
1.1 paf 242:
1.3 paf 243: int error=cursor->c_get(cursor, &dbt_key, &dbt_data,
244: DEADLOCK_POSSIBILITY_REDUCTION_FLAGS
245: | flags
246: );
1.1 paf 247: if(error==DB_NOTFOUND)
248: return false;
249:
250: check("c_get", fsource, error);
251:
1.14 paf 252: if(data=data_dbt_to_string(pool, dbt_data, 0)) // not expired
1.3 paf 253: key=&key_dbt_to_string(pool, dbt_key);
1.1 paf 254: else {
255: // save efforts by deleting expired keys
256: remove(0/*flags*/);
257: key=0;
258: }
1.4 paf 259: return true;
260: }
261:
262: bool DB_Cursor::move(u_int32_t flags) {
263: DBT dbt_key={0}; // must be zeroed
264: DBT dbt_data={0}; // must be zeroed
265: dbt_key.flags=dbt_data.flags=DB_DBT_PARTIAL; // just peep, not actually read [size=0]
266:
267: int error=cursor->c_get(cursor, &dbt_key, &dbt_data,
268: DEADLOCK_POSSIBILITY_REDUCTION_FLAGS
269: | flags
270: );
271: if(error==DB_NOTFOUND)
272: return false;
273:
274: check("c_get", fsource, error);
1.1 paf 275: return true;
276: }
277:
278: void DB_Cursor::remove(u_int32_t flags) {
279: check("c_del", fsource, cursor->c_del(cursor, flags));
280: }
281:
282: #endif
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