Annotation of parser3/src/main/pa_db_connection.C, revision 1.32
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)
1.28 paf 5: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1 parser 6:
1.32 ! paf 7: $Id: pa_db_connection.C,v 1.31 2001/11/05 16:07:16 paf Exp $
1.20 paf 8:
9: developed with LIBDB 2.7.4
1.1 parser 10: */
11:
12: #include "pa_config_includes.h"
1.19 paf 13: #ifdef DB2
1.1 parser 14:
15: #include "pa_db_connection.h"
1.11 paf 16: #include "pa_db_table.h"
1.1 parser 17: #include "pa_exception.h"
1.11 paf 18: #include "pa_threads.h"
19: #include "pa_stack.h"
20: #include "pa_common.h"
1.28 paf 21: #include "pa_vtable.h"
1.1 parser 22:
1.14 paf 23: // defines
24:
1.11 paf 25: // consts
26:
1.15 paf 27: /// @test increase
28: const int DB_CHECKPOINT_MINUTES=1;
29:
1.32 ! paf 30: const int EXPIRE_UNUSED_TABLE_SECONDS=60;
1.11 paf 31: const int CHECK_EXPIRED_TABLES_SECONDS=EXPIRE_UNUSED_TABLE_SECONDS*2;
32:
33: // callbacks
1.10 parser 34:
1.11 paf 35: static void db_paniccall(DB_ENV *dbenv, int error) {
36: throw Exception(0, 0,
37: 0,
38: "db_panic: %s (%d)",
39: strerror(error), error);
40: }
41:
42: static void db_errcall(const char *, char *buffer) {
43: throw Exception(0, 0,
44: 0,
1.23 paf 45: "db_err: %s",
1.11 paf 46: buffer);
47: }
1.5 parser 48:
1.13 paf 49: static void expire_table(const Hash::Key& key, Hash::Val *& value, void *info) {
1.30 paf 50: if(DB_Table *table=static_cast<DB_Table *>(value)) {
51: time_t older_dies=reinterpret_cast<time_t>(info);
1.5 parser 52:
1.30 paf 53: if(table->expired(older_dies)) {
54: table->~DB_Table(); value=0;
55: }
1.13 paf 56: }
1.11 paf 57: }
1.5 parser 58:
1.3 parser 59: // DB_Connection
60:
1.13 paf 61: DB_Connection::DB_Connection(Pool& apool, const String& adb_home) : Pooled(apool),
62: time_used(0),
1.28 paf 63: fdb_home(adb_home), used(0),
1.13 paf 64: table_cache(apool),
1.11 paf 65: prev_expiration_pass_time(0) {
66: //_asm int 3;
67: char DB_DATA_DIR__VALUE[MAX_STRING];
68: char DB_LOG_DIR__VALUE[MAX_STRING];
69: char DB_TMP_DIR__VALUE[MAX_STRING];
70:
71: const char *db_home_cstr=fdb_home.cstr(String::UL_FILE_SPEC);
72:
73: snprintf(DB_DATA_DIR__VALUE, MAX_STRING, "DB_DATA_DIR %s", db_home_cstr);
74: snprintf(DB_LOG_DIR__VALUE, MAX_STRING, "DB_LOG_DIR %s", db_home_cstr);
75: snprintf(DB_TMP_DIR__VALUE, MAX_STRING, "DB_TMP_DIR %s", db_home_cstr);
76:
77: char *db_config[] = {
78: DB_DATA_DIR__VALUE,
79: DB_LOG_DIR__VALUE,
80: DB_TMP_DIR__VALUE,
81: 0
82: };
83:
84: u_int32_t flags=
1.29 paf 85: (parser_multithreaded?DB_THREAD:0)
1.13 paf 86: | DB_CREATE
1.11 paf 87: | DB_INIT_MPOOL | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_TXN;
88:
1.27 paf 89: // prepare dbenv structure
1.16 paf 90: memset(&dbenv, 0, sizeof(dbenv));
91:
1.14 paf 92: // error handlers
1.20 paf 93: #if DB_VERSION_MINOR >= 7
1.14 paf 94: dbenv.db_paniccall=db_paniccall;
1.20 paf 95: #endif
1.14 paf 96: dbenv.db_errcall=db_errcall;
1.26 paf 97:
98: // lockdetector flags
99: dbenv.lk_detect=DB_LOCK_RANDOM;
1.16 paf 100:
101: // init
102: check("db_appinit", &fdb_home, db_appinit(
103: db_home_cstr,
104: db_config,
105: &dbenv,
106: flags
107: ));
1.28 paf 108:
109: // after some hang noticed this to be null
110: if(!dbenv.tx_info)
111: throw Exception(0, 0,
112: &fdb_home,
113: "transaction system failed to initialize");
1.11 paf 114: }
115:
1.13 paf 116: DB_Connection::~DB_Connection() {
1.11 paf 117: // close tables
1.13 paf 118: table_cache.for_each(expire_table,
1.31 paf 119: reinterpret_cast<void *>(time(0)/* =now= expire[close] all*/));
1.11 paf 120:
121: // destroy connection data
1.13 paf 122: check("db_appexit", &fdb_home, db_appexit(&dbenv));
1.11 paf 123: }
124:
125:
1.1 parser 126: void DB_Connection::check(const char *operation, const String *source, int error) {
127: switch(error) {
128: case 0:
129: // no error
130: break;
131:
132: default:
1.21 paf 133: if(error<0)
134: throw Exception(0, 0,
135: source,
136: "db %s error: %d",
137: operation, error);
138: else
139: throw Exception(0, 0,
140: source,
141: "db %s error: %s (%d)",
142: operation, strerror(error), error);
1.1 parser 143: }
144: }
145:
1.15 paf 146: DB_Table_ptr DB_Connection::get_table_ptr(const String& request_file_name, const String *source) {
147: // checkpoint
1.28 paf 148: {
1.21 paf 149: int error=txn_checkpoint(dbenv.tx_info, 0/*kbyte*/, DB_CHECKPOINT_MINUTES/*min*/);
150: /*
151: DB_INCOMPLETE if there were pages that needed to be written
152: but that memp_sync was unable to write immediately.
153: In this case, the txn_checkpoint call should be retried.
154:
155: we'll just ignore that
156: */
157: if(error!=DB_INCOMPLETE)
158: check("checkpoint", source, error);
159: }
1.11 paf 160:
161: // first trying to get cached table
162: DB_Table *result=get_table_from_cache(request_file_name);
1.13 paf 163: if(!result) { // no cached table
1.11 paf 164: // make global_file_name C-string on global pool
1.24 paf 165: const char *request_file_name_cstr=request_file_name.cstr();
1.11 paf 166: char *global_file_name_cstr=(char *)malloc(strlen(request_file_name_cstr)+1);
167: strcpy(global_file_name_cstr, request_file_name_cstr);
168: // make global_file_name string on global pool
169: String& global_file_name=*new(this->pool()) String(this->pool(), global_file_name_cstr);
170:
171: // allocate in global pool
172: // associate with services[request]
173: // NOTE: never freed up!
174: result=new(this->pool()) DB_Table(this->pool(), global_file_name, *this);
1.13 paf 175: // cache it
176: put_table_to_cache(global_file_name, *result);
1.4 parser 177: }
1.1 parser 178:
1.13 paf 179: // return auto-it
180: return DB_Table_ptr(result);
1.1 parser 181: }
1.11 paf 182:
183: // table cache
184: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
185: DB_Table *DB_Connection::get_table_from_cache(const String& file_name) {
186: SYNCHRONIZED;
1.17 paf 187:
188: maybe_expire_table_cache();
1.11 paf 189:
1.13 paf 190: return static_cast<DB_Table *>(table_cache.get(file_name));
1.3 parser 191: }
192:
1.13 paf 193: void DB_Connection::put_table_to_cache(const String& file_name, DB_Table& table) {
1.11 paf 194: SYNCHRONIZED;
1.3 parser 195:
1.13 paf 196: table_cache.put(file_name, &table);
1.3 parser 197: }
198:
1.11 paf 199: void DB_Connection::maybe_expire_table_cache() {
200: time_t now=time(0);
201:
202: if(prev_expiration_pass_time<now-CHECK_EXPIRED_TABLES_SECONDS) {
1.13 paf 203: table_cache.for_each(expire_table,
1.11 paf 204: reinterpret_cast<void *>(now-EXPIRE_UNUSED_TABLE_SECONDS));
1.3 parser 205:
1.11 paf 206: prev_expiration_pass_time=now;
1.9 parser 207: }
1.28 paf 208: }
209:
210: static void add_table_to_status_table(const Hash::Key& key, Hash::Val *& value, void *info) {
1.30 paf 211: if(DB_Table *db_table=static_cast<DB_Table *>(value)) {
212: Table& status_table=*static_cast<Table *>(info);
213: Pool& pool=status_table.pool();
214:
215: Array& row=*new(pool) Array(pool);
216:
217: // name
218: row+=&db_table->file_name();
219: // time
220: time_t time_stamp=db_table->get_time_used();
221: const char *unsafe_time_cstr=ctime(&time_stamp);
222: int time_buf_size=strlen(unsafe_time_cstr);
223: char *safe_time_buf=(char *)pool.malloc(time_buf_size);
224: memcpy(safe_time_buf, unsafe_time_cstr, time_buf_size);
225: row+=new(pool) String(pool, safe_time_buf, time_buf_size);
226: // users
227: char *users_buf=(char *)pool.malloc(MAX_NUMBER);
228: row+=new(pool) String(pool,
229: users_buf, snprintf(users_buf, MAX_NUMBER, "%d", db_table->get_users_count()));
1.28 paf 230:
1.30 paf 231: status_table+=&row;
232: }
1.28 paf 233: }
234: Value& DB_Connection::get_status(Pool& pool, const String *source) {
235: Array& columns=*new(pool) Array(pool);
236: columns+=new(pool) String(pool, "name");
237: columns+=new(pool) String(pool, "time");
238: columns+=new(pool) String(pool, "users");
239: Table& table=*new(pool) Table(pool, 0, &columns, table_cache.size());
240:
241: table_cache.for_each(add_table_to_status_table, &table);
242:
243: return *new(pool) VTable(pool, &table);
1.1 parser 244: }
245:
246: #endif
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