Annotation of parser3/src/main/pa_db_manager.C, revision 1.18
1.1 parser 1: /** @file
2: Parser: sql driver manager implementation.
3:
4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.12 paf 5: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1 parser 6:
1.18 ! paf 7: $Id: pa_db_manager.C,v 1.17 2001/11/08 14:47:32 paf Exp $
1.1 parser 8: */
9:
1.3 parser 10: #include "pa_config_includes.h"
1.9 paf 11: #ifdef DB2
1.3 parser 12:
1.1 parser 13: #include "pa_db_manager.h"
1.2 parser 14: #include "pa_db_connection.h"
1.1 parser 15: #include "pa_exception.h"
16: #include "pa_threads.h"
17: #include "pa_stack.h"
1.11 paf 18: #include "pa_vhash.h"
1.1 parser 19:
20: // globals
21:
22: DB_Manager *DB_manager;
23:
24: // consts
25:
1.15 paf 26: const int EXPIRE_UNUSED_CONNECTION_SECONDS=60;
1.1 parser 27: const int CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;
28:
1.4 parser 29: // callbacks
30:
1.7 paf 31: static void expire_connection(const Hash::Key& key, Hash::Val *& value, void *info) {
1.18 ! paf 32: DB_Connection *connection=static_cast<DB_Connection *>(value);
! 33: time_t older_dies=reinterpret_cast<time_t>(info);
1.6 paf 34:
1.18 ! paf 35: if(connection->expired(older_dies)) {
! 36: connection->~DB_Connection(); value=0;
1.7 paf 37: }
1.4 parser 38: }
1.1 parser 39:
40: // DB_Manager
41:
1.17 paf 42: DB_Manager::DB_Manager(Pool& apool) : Cache_manager(apool),
1.11 paf 43: connection_cache(apool),
1.1 parser 44: prev_expiration_pass_time(0) {
45: }
46:
47: DB_Manager::~DB_Manager() {
1.6 paf 48: // close connections
1.7 paf 49: connection_cache.for_each(expire_connection,
1.14 paf 50: reinterpret_cast<void *>(time(0)/* =now= expire[close] all*/));
1.1 parser 51: }
52:
1.7 paf 53: /// @test subpools mechanizm. one connection, one subpool. ~connection destructs it
54: DB_Connection_ptr DB_Manager::get_connection_ptr(const String& request_db_home,
55: const String *source) {
1.6 paf 56: if(request_db_home.size()==0)
57: throw Exception(0, 0,
1.7 paf 58: source,
1.6 paf 59: "empty DB_HOME specified");
1.1 parser 60:
61: // first trying to get cached connection
1.6 paf 62: DB_Connection *result=get_connection_from_cache(request_db_home);
1.7 paf 63: if(!result) { // no cached connection
1.6 paf 64: // make global_db_home C-string on global pool
1.10 paf 65: const char *request_db_home_cstr=request_db_home.cstr();
1.6 paf 66: char *global_db_home_cstr=(char *)malloc(strlen(request_db_home_cstr)+1);
67: strcpy(global_db_home_cstr, request_db_home_cstr);
68: // make global_db_home string on global pool
69: String& global_db_home=*new(this->pool()) String(this->pool(), global_db_home_cstr);
1.1 parser 70:
71: // allocate in global pool
72: // NOTE: never freed up!
1.6 paf 73: result=new(this->pool()) DB_Connection(this->pool(), global_db_home);
1.7 paf 74: // cache it
75: put_connection_to_cache(global_db_home, *result);
1.1 parser 76: }
77:
1.7 paf 78: // return auto-it
79: return DB_Connection_ptr(result);
1.2 parser 80: }
81:
1.1 parser 82: // connection cache
83: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.6 paf 84: DB_Connection *DB_Manager::get_connection_from_cache(const String& db_home) {
1.1 parser 85: SYNCHRONIZED;
1.8 paf 86:
1.7 paf 87: return static_cast<DB_Connection *>(connection_cache.get(db_home));
1.1 parser 88: }
89:
1.6 paf 90: void DB_Manager::put_connection_to_cache(const String& db_home,
1.1 parser 91: DB_Connection& connection) {
92: SYNCHRONIZED;
93:
1.7 paf 94: connection_cache.put(db_home, &connection);
1.1 parser 95: }
96:
1.16 paf 97: void DB_Manager::maybe_expire_cache() {
1.1 parser 98: time_t now=time(0);
99:
100: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.7 paf 101: connection_cache.for_each(expire_connection,
1.1 parser 102: reinterpret_cast<void *>(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
103:
104: prev_expiration_pass_time=now;
105: }
1.11 paf 106: }
107:
1.12 paf 108: static void add_connection_to_status_status_cache(const Hash::Key& key, Hash::Val *value, void *info) {
1.18 ! paf 109: DB_Connection *connection=static_cast<DB_Connection *>(value);
! 110: VHash& status_cache=*static_cast<VHash *>(info);
! 111: Pool& pool=status_cache.pool();
! 112:
! 113: // file => tables table
! 114: status_cache.hash(0).put(connection->db_home(), &connection->get_status(pool, 0));
1.12 paf 115: }
1.11 paf 116: Value& DB_Manager::get_status(Pool& pool, const String *source) {
117: VHash& result=*new(pool) VHash(pool);
1.12 paf 118:
119: // db_homes
1.11 paf 120: {
1.12 paf 121: VHash& status_cache=*new(pool) VHash(pool);
122: connection_cache.for_each(add_connection_to_status_status_cache, &status_cache);
1.11 paf 123:
1.12 paf 124: result.hash(source).put(*new(pool) String(pool, "cache"), &status_cache);
125: }
1.11 paf 126:
127: return result;
1.1 parser 128: }
1.3 parser 129:
130: #endif
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