Annotation of parser3/src/main/pa_stylesheet_manager.C, revision 1.16.2.6
1.1 parser 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.16.2.1 paf 4: Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
1.13 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 parser 6: */
7: #include "pa_config_includes.h"
8: #ifdef XML
1.14 paf 9:
1.16.2.6! paf 10: static const char* IDENT_STYLESHEET_MANAGER_C="$Date: 2003/03/06 12:58:33 $";
1.1 parser 11:
12: #include "pa_stylesheet_manager.h"
13: #include "pa_stylesheet_connection.h"
14: #include "pa_exception.h"
15: #include "pa_common.h"
16: #include "pa_threads.h"
17: #include "pa_stack.h"
1.2 paf 18: #include "pa_vhash.h"
1.3 paf 19: #include "pa_vtable.h"
1.1 parser 20:
21: // globals
22:
1.16.2.5 paf 23: Stylesheet_manager stylesheet_manager;
1.1 parser 24:
25: // consts
26:
1.16.2.6! paf 27: const time_t SECOND=1;
! 28: const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=5*60;
! 29: const time_t CHECK_EXPIRED_CONNECTION_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;
1.1 parser 30:
31: // helpers
32:
1.16.2.6! paf 33: static void expire_connection(Stylesheet_connection& connection, time_t older_dies) {
1.1 parser 34: if(connection.connected() && connection.expired(older_dies))
35: connection.disconnect();
36: }
1.16.2.6! paf 37: static void expire_connections(
! 38: Stylesheet_manager::connection_cache_type::key_type /*key*/,
! 39: Stylesheet_manager::connection_cache_type::value_type stack,
! 40: time_t older_dies) {
! 41: for(int i=0; i<=stack->top_index(); i++)
! 42: expire_connection(*stack->get(i), older_dies);
1.1 parser 43: }
44:
45: // Stylesheet_manager
46:
1.16.2.6! paf 47: Stylesheet_manager::Stylesheet_manager(): prev_expiration_pass_time(0) {}
1.1 parser 48: Stylesheet_manager::~Stylesheet_manager() {
1.16.2.6! paf 49: connection_cache.for_each(expire_connections, time(0)+SECOND/*=in future=expire all*/);
1.1 parser 50: }
51:
1.16.2.6! paf 52: Stylesheet_connectionPtr Stylesheet_manager::get_connection(StringPtr file_spec) {
! 53: Stylesheet_connectionPtr result=get_connection_from_cache(file_spec);
! 54: if(!result)
! 55: result=Stylesheet_connectionPtr(new Stylesheet_connection(file_spec));
! 56: return result;
1.1 parser 57: }
58:
1.16.2.5 paf 59: void Stylesheet_manager::close_connection(StringPtr file_spec,
1.1 parser 60: Stylesheet_connection& connection) {
1.16.2.6! paf 61: put_connection_to_cache(file_spec, Stylesheet_connectionPtr(&connection));
1.1 parser 62: }
63:
64: // stylesheet cache
65: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.16.2.6! paf 66: Stylesheet_connectionPtr Stylesheet_manager::get_connection_from_cache(StringPtr file_spec) {
1.1 parser 67: SYNCHRONIZED;
68:
1.16.2.6! paf 69: if(connection_cache_type::value_type connections=connection_cache.get(file_spec))
1.1 parser 70: while(connections->top_index()>=0) { // there are cached stylesheets to that 'file_spec'
1.16.2.6! paf 71: Stylesheet_connectionPtr result=connections->pop();
1.1 parser 72: if(result->connected()) // not expired?
73: return result;
74: }
75:
1.16.2.6! paf 76: return Stylesheet_connectionPtr(0);
1.1 parser 77: }
78:
1.16.2.5 paf 79: void Stylesheet_manager::put_connection_to_cache(StringPtr file_spec,
1.16.2.6! paf 80: Stylesheet_connectionPtr connection) {
1.1 parser 81: SYNCHRONIZED;
82:
1.16.2.6! paf 83: connection_cache_type::value_type connections=connection_cache.get(file_spec);
1.1 parser 84: if(!connections) { // there are no cached stylesheets to that 'file_spec' yet?
1.16.2.6! paf 85: connections=connection_cache_type::value_type(new connection_cache_type::value_type::element_type);
1.1 parser 86: connection_cache.put(file_spec, connections);
87: }
1.16.2.6! paf 88: connections->push(connection);
1.1 parser 89: }
90:
1.5 paf 91: void Stylesheet_manager::maybe_expire_cache() {
1.1 parser 92: time_t now=time(0);
93:
94: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTION_SECONDS) {
1.16.2.6! paf 95: connection_cache.for_each(expire_connections, now-EXPIRE_UNUSED_CONNECTION_SECONDS);
1.1 parser 96:
97: prev_expiration_pass_time=now;
98: }
99: }
1.16.2.6! paf 100: /*
1.3 paf 101: static void add_connection_to_status_cache_table(Array::Item *value, void *info) {
102: Stylesheet_connection& connection=*static_cast<Stylesheet_connection *>(value);
103: Table& table=*static_cast<Table *>(info);
104:
105: if(connection.connected()) {
106: Pool& pool=table.pool();
1.4 paf 107: Array& row=*new(pool) Array(pool);
1.3 paf 108:
1.4 paf 109: // file
1.3 paf 110: row+=&connection.file_spec();
1.4 paf 111: // time
1.3 paf 112: time_t time_stamp=connection.get_time_used();
1.16.2.2 paf 113: row+=new(pool) String(pool, pool.copy(ctime(&time_stamp)));
1.3 paf 114:
115: table+=&row;
116: }
117: }
118: static void add_connections_to_status_cache_table(const Hash::Key& key, Hash::Val *value, void *info) {
119: Stack& stack=*static_cast<Stack *>(value);
120: Array_iter iter(stack);
121: for(int countdown=stack.top_index(); countdown-->=0; )
122: add_connection_to_status_cache_table(iter.next(), info);
123: }
1.16.2.6! paf 124: */
! 125: ValuePtr Stylesheet_manager::get_status(Pool& pool, StringPtr source) {
! 126: VHashPtr result(new VHash);
! 127: /*
1.2 paf 128: // cache
129: {
1.4 paf 130: Array& columns=*new(pool) Array(pool);
1.3 paf 131: columns+=new(pool) String(pool, "file");
1.2 paf 132: columns+=new(pool) String(pool, "time");
133: Table& table=*new(pool) Table(pool, 0, &columns, connection_cache.size());
134:
135: connection_cache.for_each(add_connections_to_status_cache_table, &table);
136:
137: result.hash(source).put(*new(pool) String(pool, "cache"), new(pool) VTable(pool, &table));
138: }
1.16.2.6! paf 139: */
1.2 paf 140: return result;
141: }
142:
1.1 parser 143: #endif
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