Annotation of parser3/src/main/pa_db_table.C, revision 1.6
1.1 paf 1: /** @file
2: Parser: Charset table implementation.
3:
4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
5: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
6:
1.6 ! paf 7: $Id: pa_db_table.C,v 1.5 2001/10/27 13:00:09 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"
1.1 paf 16:
17: // defines
18:
1.6 ! paf 19: #if DB_VERSION_MINOR >= 7
! 20: # define DEADLOCK_POSSIBILITY_REDUCTION_FLAGS DB_RMW
! 21: #else
! 22: # define DEADLOCK_POSSIBILITY_REDUCTION_FLAGS 0
! 23: #endif
! 24:
1.1 paf 25:
26: // consts
27:
28: const int DATA_STRING_SERIALIZED_VERSION=0x0100;
29:
30: // helper types
31:
32: #ifndef DOXYGEN
33: struct Data_string_serialized_prolog {
34: int version;
35: time_t time_to_die;
36: };
1.3 paf 37:
38: struct DBT_auto : public DBT {
39: DBT_auto() {
40: data=0;
41: size=ulen=dlen=doff=0;
42: flags=DB_DBT_MALLOC;
43: }
44:
45: ~DBT_auto() {
46: if(flags & DB_DBT_MALLOC)
47: free(data);
48: }
49: };
50:
1.1 paf 51: #endif
52:
53: // DB_Table
54:
1.3 paf 55: DB_Table::DB_Table(Pool& pool, const String& afile_name, DB_Connection& aconnection) : Pooled(pool),
1.1 paf 56: time_used(0), fservices_pool(0),
57: fconnection(aconnection),
58: dbenv(aconnection.dbenv),
1.3 paf 59: ffile_name(afile_name), file_name_cstr(afile_name.cstr(String::UL_FILE_SPEC)),
60: db(0) {
61:
62: // open
63: DB_INFO dbinfo;
64: memset(&dbinfo, 0, sizeof(dbinfo));
65: check("open/create", &ffile_name, db_open(
66: file_name_cstr,
67: PA_DB_ACCESS_METHOD,
68: DB_THREAD
69: | DB_CREATE /* used in single thread, no need for |DB_THREAD*/,
70: 0666,
71: &dbenv, &dbinfo, &db));
72: }
73: /// @todo this one of reasons of not having ^try for now
74: DB_Table::~DB_Table() {
75: // close
76: check("close", &ffile_name, db->close(db, 0/*flags*/)); db=0;
77: }
78:
79: void DB_Table::use() {
80: fconnection.use();
81:
82: time_used=time(0); // they started to use at this time
83: used++;
84: }
85: void DB_Table::unuse() {
86: used--;
87:
88: fconnection.unuse();
1.1 paf 89: }
90:
1.3 paf 91:
92:
1.1 paf 93: void DB_Table::check(const char *operation, const String *source, int error) {
94: switch(error) {
95: case 0:
96: // no error
97: break;
98:
99: case DB_KEYEXIST:
100: // DB_KEYEXIST is a "normal" return, so should not be
101: // thrown as an error
102: break;
103:
1.6 ! paf 104: #ifdef DB_RUNRECOVERY
1.1 paf 105: case DB_RUNRECOVERY:
106: throw Exception(0, 0,
107: source,
108: "action failed, RUN RECOVERY UTILITY. db %s error, real filename '%s'",
1.3 paf 109: operation, file_name_cstr);
1.6 ! paf 110: #endif
! 111:
1.1 paf 112: default:
113: throw Exception(0, 0,
114: source,
115: "action failed. db %s error: %s (%d), real filename '%s'",
1.3 paf 116: operation, strerror(error), error, file_name_cstr);
1.1 paf 117: }
118: }
119:
120: void DB_Table::key_string_to_dbt(const String& key_string, DBT& key_result) {
121: memset(&key_result, 0, sizeof(key_result));
122: key_result.data=key_string.cstr(String::UL_AS_IS);
123: key_result.size=key_string.size();
124: }
125:
1.3 paf 126: String& DB_Table::key_dbt_to_string(Pool& pool, const DBT& key_dbt) {
1.1 paf 127: String& result=*new(*fservices_pool) String(*fservices_pool);
128: if(key_dbt.size) {
1.3 paf 129: char *request_data=(char *)pool.malloc(key_dbt.size);
1.1 paf 130: memcpy(request_data, key_dbt.data, key_dbt.size);
1.3 paf 131: result.APPEND_TAINTED(request_data, key_dbt.size, file_name_cstr, 0/*line*/);
1.1 paf 132: }
133: return result;
134: }
135:
136: void DB_Table::data_string_to_dbt(const String& data_string, time_t time_to_die,
137: DBT& data_result) {
138: memset(&data_result, 0, sizeof(data_result));
139:
140: data_string.serialize(
141: sizeof(Data_string_serialized_prolog),
142: data_result.data, data_result.size);
143:
144: Data_string_serialized_prolog& prolog=
145: *static_cast<Data_string_serialized_prolog *>(data_result.data);
146:
147: prolog.version=DATA_STRING_SERIALIZED_VERSION;
148: prolog.time_to_die=time_to_die;
149: }
150:
1.3 paf 151: String *DB_Table::data_dbt_to_string(Pool& pool, const DBT& data_dbt) {
1.1 paf 152: Data_string_serialized_prolog& prolog=
153: *static_cast<Data_string_serialized_prolog *>(data_dbt.data);
154:
155: if(prolog.version!=DATA_STRING_SERIALIZED_VERSION)
156: throw Exception(0, 0,
1.3 paf 157: &ffile_name,
1.1 paf 158: "data string version 0x%04X not equal to 0x%04X, recreate file",
159: prolog.version, DATA_STRING_SERIALIZED_VERSION);
160:
161: if(prolog.time_to_die/*specified*/ && prolog.time_to_die <= time(0)/*expired*/)
162: return 0;
163:
1.3 paf 164: String& result=*new(pool) String(pool);
165: if(data_dbt.size) {
166: char *data=(char *)pool.malloc(data_dbt.size);
167: memcpy(data, data_dbt.data, data_dbt.size);
168: result.deserialize(
169: sizeof(Data_string_serialized_prolog),
170: data, data_dbt.size, file_name_cstr);
171: }
1.1 paf 172: return &result;
173: }
174:
1.3 paf 175: void DB_Table::put(DB_Transaction *t, const String& key, const String& data, time_t time_to_die) {
1.1 paf 176: DBT dbt_key; key_string_to_dbt(key, dbt_key);
177: DBT dbt_data; data_string_to_dbt(data, time_to_die, dbt_data);
1.3 paf 178: check("put", &key, db->put(db, t?t->id():0, &dbt_key, &dbt_data, 0/*flags*/));
1.1 paf 179: }
180:
1.3 paf 181: String *DB_Table::get(DB_Transaction *t, Pool& pool, const String& key) {
1.1 paf 182: DBT dbt_key; key_string_to_dbt(key, dbt_key);
1.3 paf 183: DBT_auto dbt_data;
184: int error=db->get(db, t?t->id():0, &dbt_key, &dbt_data,
185: DEADLOCK_POSSIBILITY_REDUCTION_FLAGS);
1.1 paf 186: if(error==DB_NOTFOUND)
187: return 0;
188: else {
189: check("get", &key, error);
1.3 paf 190: String *result=data_dbt_to_string(pool, dbt_data);
1.1 paf 191: if(!result) // save efforts by deleting expired keys
1.3 paf 192: check("del expired", &key, db->del(db, t?t->id():0, &dbt_key, 0/*flags*/));
1.1 paf 193: return result;
194: }
195: }
196:
1.3 paf 197: void DB_Table::remove(DB_Transaction *t, const String& key) {
1.1 paf 198: DBT dbt_key; key_string_to_dbt(key, dbt_key);
199:
1.3 paf 200: int error=db->del(db, t?t->id():0, &dbt_key, 0/*flags*/);
1.1 paf 201: if(error!=DB_NOTFOUND)
202: check("del", &key, error);
203: }
204:
1.3 paf 205: // DB_Transaction
206:
207: DB_Transaction::DB_Transaction(Pool& apool, DB_Table& atable, DB_Transaction *& aparent_ref) :
208: fpool(apool), ftable(atable), fparent_ref(aparent_ref),
209: parent(aparent_ref),
210: fid(0), marked_to_rollback(false) {
211:
212: check("txn_begin",
213: &ftable.file_name(), txn_begin(ftable.dbenv.tx_info, parent?parent->fid:0, &fid));
214:
215: aparent_ref=this;
216: }
217: DB_Transaction::~DB_Transaction() {
218: fparent_ref=parent;
219:
220: if(parent) // all in hands of our parent
221: return;
222:
223: if(marked_to_rollback)
224: check("txn_abort", &ftable.file_name(), txn_abort(fid));
225: else
226: check("txn_commit", &ftable.file_name(), txn_commit(fid));
227: }
228: void DB_Transaction::mark_to_rollback() {
229: if(parent)
230: parent->mark_to_rollback();
231: else
232: marked_to_rollback=true;
233: }
234:
1.1 paf 235: // DB_Cursor
236:
237: DB_Cursor::DB_Cursor(
1.3 paf 238: DB_Table& atable, DB_Transaction *transaction,
239: const String *asource) :
240: ftable(atable), fsource(asource),
241: cursor(0) {
242:
1.1 paf 243: check("cursor", fsource, ftable.db->cursor(ftable.db,
1.6 ! paf 244: transaction?transaction->id():0, &cursor
! 245: #if DB_VERSION_MINOR >= 7
! 246: , 0/*flags*/
! 247: #endif
! 248: ));
1.1 paf 249: }
250:
251: DB_Cursor::~DB_Cursor() {
1.3 paf 252: if(cursor)
253: check("c_close", fsource, cursor->c_close(cursor));
1.1 paf 254: }
255:
1.3 paf 256: bool DB_Cursor::get(Pool& pool, String *& key, String *& data, u_int32_t flags) {
1.1 paf 257: DBT dbt_key={0}; // must be zeroed
1.3 paf 258: DBT_auto dbt_data;
1.1 paf 259:
1.3 paf 260: int error=cursor->c_get(cursor, &dbt_key, &dbt_data,
261: DEADLOCK_POSSIBILITY_REDUCTION_FLAGS
262: | flags
263: );
1.1 paf 264: if(error==DB_NOTFOUND)
265: return false;
266:
267: check("c_get", fsource, error);
268:
1.3 paf 269: if(data=data_dbt_to_string(pool, dbt_data)) // not expired
270: key=&key_dbt_to_string(pool, dbt_key);
1.1 paf 271: else {
272: // save efforts by deleting expired keys
273: remove(0/*flags*/);
274: key=0;
275: }
1.4 paf 276: return true;
277: }
278:
279: bool DB_Cursor::move(u_int32_t flags) {
280: DBT dbt_key={0}; // must be zeroed
281: DBT dbt_data={0}; // must be zeroed
282: dbt_key.flags=dbt_data.flags=DB_DBT_PARTIAL; // just peep, not actually read [size=0]
283:
284: int error=cursor->c_get(cursor, &dbt_key, &dbt_data,
285: DEADLOCK_POSSIBILITY_REDUCTION_FLAGS
286: | flags
287: );
288: if(error==DB_NOTFOUND)
289: return false;
290:
291: check("c_get", fsource, error);
1.1 paf 292: return true;
293: }
294:
295: void DB_Cursor::remove(u_int32_t flags) {
296: check("c_del", fsource, cursor->c_del(cursor, flags));
297: }
298:
299: #endif
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