Annotation of parser3/src/main/pa_db_connection.C, revision 1.14
1.1 parser 1: /** @file
1.11 paf 2: Parser: sql driver connection implementation.
1.1 parser 3:
4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
5: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
6:
1.14 ! paf 7: $Id: pa_db_connection.C,v 1.13 2001/10/26 13:48:19 paf Exp $
1.1 parser 8: */
9:
10: #include "pa_config_includes.h"
11: #ifdef HAVE_LIBDB
12:
13: #include "pa_db_connection.h"
1.11 paf 14: #include "pa_db_table.h"
1.1 parser 15: #include "pa_exception.h"
1.11 paf 16: #include "pa_threads.h"
17: #include "pa_stack.h"
18: #include "pa_common.h"
1.1 parser 19:
1.14 ! paf 20: // defines
! 21:
! 22: #define DB_ERROR_PREFIX "db_err: "
! 23: #define DB_EXCEPTION_NO_LOG_MESSAGE1 DB_ERROR_PREFIX"Ignoring log file"
! 24: #define DB_EXCEPTION_NO_LOG_MESSAGE2 DB_ERROR_PREFIX"log_get: unable to find checkpoint record"
! 25:
1.11 paf 26: // consts
27:
28: const int EXPIRE_UNUSED_TABLE_SECONDS=60;
29: const int CHECK_EXPIRED_TABLES_SECONDS=EXPIRE_UNUSED_TABLE_SECONDS*2;
30:
31: // callbacks
1.10 parser 32:
1.11 paf 33: static void db_paniccall(DB_ENV *dbenv, int error) {
34: throw Exception(0, 0,
35: 0,
36: "db_panic: %s (%d)",
37: strerror(error), error);
38: }
39:
40: static void db_errcall(const char *, char *buffer) {
41: throw Exception(0, 0,
42: 0,
1.14 ! paf 43: DB_ERROR_PREFIX "%s",
1.11 paf 44: buffer);
45: }
1.5 parser 46:
1.13 paf 47: static void expire_table(const Hash::Key& key, Hash::Val *& value, void *info) {
48: DB_Connection& table=*static_cast<DB_Connection *>(value);
1.11 paf 49: time_t older_dies=reinterpret_cast<time_t>(info);
1.5 parser 50:
1.13 paf 51: if(table.expired(older_dies)) {
52: table.~DB_Connection(); value=0;
53: }
1.11 paf 54: }
1.5 parser 55:
1.3 parser 56: // DB_Connection
57:
1.13 paf 58: DB_Connection::DB_Connection(Pool& apool, const String& adb_home) : Pooled(apool),
59: time_used(0),
60: fdb_home(adb_home),
61: table_cache(apool),
1.11 paf 62: prev_expiration_pass_time(0) {
63: //_asm int 3;
64: char DB_DATA_DIR__VALUE[MAX_STRING];
65: char DB_LOG_DIR__VALUE[MAX_STRING];
66: char DB_TMP_DIR__VALUE[MAX_STRING];
67:
68: const char *db_home_cstr=fdb_home.cstr(String::UL_FILE_SPEC);
69:
70: snprintf(DB_DATA_DIR__VALUE, MAX_STRING, "DB_DATA_DIR %s", db_home_cstr);
71: snprintf(DB_LOG_DIR__VALUE, MAX_STRING, "DB_LOG_DIR %s", db_home_cstr);
72: snprintf(DB_TMP_DIR__VALUE, MAX_STRING, "DB_TMP_DIR %s", db_home_cstr);
73:
74: char *db_config[] = {
75: DB_DATA_DIR__VALUE,
76: DB_LOG_DIR__VALUE,
77: DB_TMP_DIR__VALUE,
78: 0
79: };
80:
81: u_int32_t flags=
1.13 paf 82: DB_THREAD
83: | DB_CREATE
1.11 paf 84: | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_TXN;
85:
1.14 ! paf 86: try {
1.11 paf 87: // 1: trying to open with SOFT RECOVER option set
1.14 ! paf 88: memset(&dbenv, 0, sizeof(dbenv));
1.11 paf 89: check("db_appinit soft recover", &fdb_home, db_appinit(
90: db_home_cstr,
91: db_config,
92: &dbenv,
93: flags | DB_RECOVER
94: ));
1.14 ! paf 95: } catch(const Exception& e) {
! 96: if(
! 97: strncmp(
! 98: e.comment(),
! 99: DB_EXCEPTION_NO_LOG_MESSAGE1,
! 100: strlen(DB_EXCEPTION_NO_LOG_MESSAGE1))==0 ||
! 101: strncmp(
! 102: e.comment(),
! 103: DB_EXCEPTION_NO_LOG_MESSAGE2,
! 104: strlen(DB_EXCEPTION_NO_LOG_MESSAGE2))==0) {
! 105: // no log = no SOFT RECOVER
! 106: // 2.1: trying to open with NO RECOVER option set
! 107: memset(&dbenv, 0, sizeof(dbenv));
1.11 paf 108: check("db_appinit no recover", &fdb_home, db_appinit(
109: db_home_cstr,
110: db_config,
111: &dbenv,
112: flags
113: ));
1.14 ! paf 114: } else {
! 115: // some serious error
! 116: // 2.2: trying to open with FATAL RECOVER option set
! 117: memset(&dbenv, 0, sizeof(dbenv));
1.11 paf 118: check("db_appinit fatal recover", &fdb_home, db_appinit(
119: db_home_cstr,
120: db_config,
121: &dbenv,
122: flags | DB_RECOVER_FATAL
123: ));
124: }
1.14 ! paf 125: }
! 126:
! 127: // error handlers
! 128: dbenv.db_paniccall=db_paniccall;
! 129: dbenv.db_errcall=db_errcall;
1.11 paf 130: }
131:
1.13 paf 132: DB_Connection::~DB_Connection() {
1.11 paf 133: // close tables
1.13 paf 134: table_cache.for_each(expire_table,
1.11 paf 135: reinterpret_cast<void *>(0/* =in the past = expire[close] all*/));
136:
137: // destroy connection data
1.13 paf 138: check("db_appexit", &fdb_home, db_appexit(&dbenv));
1.11 paf 139: }
140:
141:
1.1 parser 142: void DB_Connection::check(const char *operation, const String *source, int error) {
143: switch(error) {
144: case 0:
145: // no error
146: break;
147:
148: default:
149: throw Exception(0, 0,
1.3 parser 150: source,
1.11 paf 151: "db %s error: %s (%d)",
152: operation, strerror(error), error);
1.1 parser 153: }
154: }
155:
1.13 paf 156: DB_Table_ptr DB_Connection::get_table_ptr(const String& request_file_name, const String *origin) {
157: if(!used)
158: throw(0, 0,
159: origin,
160: "note to parser3 programmer: your forgot about DB_Connection_usage");
1.11 paf 161:
162: // first trying to get cached table
163: DB_Table *result=get_table_from_cache(request_file_name);
1.13 paf 164: if(!result) { // no cached table
1.11 paf 165: // make global_file_name C-string on global pool
1.13 paf 166: const char *request_file_name_cstr=request_file_name.cstr(String::UL_AS_IS);
1.11 paf 167: char *global_file_name_cstr=(char *)malloc(strlen(request_file_name_cstr)+1);
168: strcpy(global_file_name_cstr, request_file_name_cstr);
169: // make global_file_name string on global pool
170: String& global_file_name=*new(this->pool()) String(this->pool(), global_file_name_cstr);
171:
172: // allocate in global pool
173: // associate with services[request]
174: // NOTE: never freed up!
175: result=new(this->pool()) DB_Table(this->pool(), global_file_name, *this);
1.13 paf 176: // cache it
177: put_table_to_cache(global_file_name, *result);
1.4 parser 178: }
1.1 parser 179:
1.13 paf 180: // return auto-it
181: return DB_Table_ptr(result);
1.11 paf 182: }
183: void DB_Connection::clear_dbfile(const String& file_name) {
184: // open&clear
185: DB *db;
1.1 parser 186: DB_INFO dbinfo;
187: memset(&dbinfo, 0, sizeof(dbinfo));
1.11 paf 188: check("open(clear)", &file_name, db_open(
189: file_name.cstr(String::UL_FILE_SPEC),
1.1 parser 190: PA_DB_ACCESS_METHOD,
1.11 paf 191: DB_CREATE | DB_TRUNCATE/* used in single thread, no need for |DB_THREAD*/,
1.1 parser 192: 0666,
1.11 paf 193: &dbenv, &dbinfo, &db));
194:
195: check("close", &file_name, db->close(db, 0/*flags*/)); db=0;
1.1 parser 196: }
1.11 paf 197:
198: // table cache
199: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
200: DB_Table *DB_Connection::get_table_from_cache(const String& file_name) {
201: SYNCHRONIZED;
202:
1.13 paf 203: return static_cast<DB_Table *>(table_cache.get(file_name));
1.3 parser 204: }
205:
1.13 paf 206: void DB_Connection::put_table_to_cache(const String& file_name, DB_Table& table) {
1.11 paf 207: SYNCHRONIZED;
1.3 parser 208:
1.13 paf 209: table_cache.put(file_name, &table);
1.3 parser 210: }
211:
1.11 paf 212: void DB_Connection::maybe_expire_table_cache() {
213: time_t now=time(0);
214:
215: if(prev_expiration_pass_time<now-CHECK_EXPIRED_TABLES_SECONDS) {
1.13 paf 216: table_cache.for_each(expire_table,
1.11 paf 217: reinterpret_cast<void *>(now-EXPIRE_UNUSED_TABLE_SECONDS));
1.3 parser 218:
1.11 paf 219: prev_expiration_pass_time=now;
1.9 parser 220: }
1.1 parser 221: }
222:
223: #endif
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