Annotation of parser3/src/main/pa_stylesheet_manager.C, revision 1.24
1.1 parser 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.17 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:
1.24 ! paf 10: static const char * const IDENT_STYLESHEET_MANAGER_C="$Date: 2003/12/11 09:22:09 $";
1.1 parser 11:
12: #include "pa_stylesheet_manager.h"
13: #include "pa_exception.h"
14: #include "pa_common.h"
15: #include "pa_threads.h"
16: #include "pa_stack.h"
1.2 paf 17: #include "pa_vhash.h"
1.3 paf 18: #include "pa_vtable.h"
1.1 parser 19:
20: // globals
21:
1.23 paf 22: Stylesheet_manager* stylesheet_manager=0;
1.1 parser 23:
24: // consts
25:
1.17 paf 26: const time_t SECOND=1;
27: const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=5*60;
28: const time_t CHECK_EXPIRED_CONNECTION_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;
1.1 parser 29:
30: // helpers
31:
1.17 paf 32: static void expire_connection(Stylesheet_connection& connection, time_t older_dies) {
1.1 parser 33: if(connection.connected() && connection.expired(older_dies))
34: connection.disconnect();
35: }
1.17 paf 36: static void expire_connections(
37: Stylesheet_manager::connection_cache_type::key_type /*key*/,
38: Stylesheet_manager::connection_cache_type::value_type stack,
39: time_t older_dies) {
1.19 paf 40: for(size_t i=0; i<stack->top_index(); i++)
1.17 paf 41: expire_connection(*stack->get(i), older_dies);
1.1 parser 42: }
43:
1.17 paf 44: // Stylesheet_connection methods
1.1 parser 45:
1.17 paf 46: void Stylesheet_connection::close() {
1.24 ! paf 47: stylesheet_manager->close_connection(ffile_spec, *this);
1.1 parser 48: }
49:
1.17 paf 50: // Stylesheet_manager methods
1.1 parser 51:
1.17 paf 52: Stylesheet_manager::Stylesheet_manager(): prev_expiration_pass_time(0) {
53: }
54:
55: Stylesheet_manager::~Stylesheet_manager() {
56: connection_cache.for_each(expire_connections, time(0)+SECOND/*=in future=expire all*/);
57: }
58:
1.21 paf 59: Stylesheet_connection_ptr Stylesheet_manager::get_connection(String::Body file_spec) {
1.17 paf 60: Stylesheet_connection* result=get_connection_from_cache(file_spec);
61: if(!result)
62: result=new Stylesheet_connection(file_spec);
63: return Stylesheet_connection_ptr(result);
1.1 parser 64: }
65:
1.21 paf 66: void Stylesheet_manager::close_connection(String::Body file_spec, Stylesheet_connection& connection) {
1.1 parser 67: put_connection_to_cache(file_spec, connection);
68: }
69:
70: // stylesheet cache
71: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.21 paf 72: Stylesheet_connection* Stylesheet_manager::get_connection_from_cache(String::Body file_spec) {
1.1 parser 73: SYNCHRONIZED;
74:
1.17 paf 75: if(connection_cache_type::value_type connections=connection_cache.get(file_spec))
76: while(!connections->is_empty()) { // there are cached stylesheets to that 'file_spec'
77: Stylesheet_connection* result=connections->pop();
1.1 parser 78: if(result->connected()) // not expired?
79: return result;
80: }
81:
82: return 0;
83: }
84:
1.21 paf 85: void Stylesheet_manager::put_connection_to_cache(String::Body file_spec,
1.17 paf 86: Stylesheet_connection& connection) {
1.1 parser 87: SYNCHRONIZED;
88:
1.17 paf 89: connection_cache_type::value_type connections=connection_cache.get(file_spec);
1.1 parser 90: if(!connections) { // there are no cached stylesheets to that 'file_spec' yet?
1.17 paf 91: connections=new connection_cache_value_type;
1.1 parser 92: connection_cache.put(file_spec, connections);
93: }
94: connections->push(&connection);
95: }
96:
1.5 paf 97: void Stylesheet_manager::maybe_expire_cache() {
1.1 parser 98: time_t now=time(0);
99:
100: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTION_SECONDS) {
1.17 paf 101: connection_cache.for_each(expire_connections, now-EXPIRE_UNUSED_CONNECTION_SECONDS);
1.1 parser 102:
103: prev_expiration_pass_time=now;
104: }
105: }
1.3 paf 106:
1.22 paf 107: static void add_connection_to_status_cache_table(Stylesheet_connection& connection, Table* table) {
1.3 paf 108: if(connection.connected()) {
1.22 paf 109: ArrayString& row=*new ArrayString;
1.3 paf 110:
1.4 paf 111: // file
1.22 paf 112: row+=new String(connection.file_spec(), String::L_AS_IS);
1.4 paf 113: // time
1.22 paf 114: time_t time_used=connection.get_time_used();
115: row+=new String(pa_strdup(ctime(&time_used)));
1.3 paf 116:
1.22 paf 117: *table+=&row;
1.3 paf 118: }
119: }
1.22 paf 120: static void add_connections_to_status_cache_table(
121: Stylesheet_manager::connection_cache_type::key_type /*key*/,
122: Stylesheet_manager::connection_cache_type::value_type stack, Table* table)
123: {
124: for(Array_iterator<Stylesheet_connection*> i(*stack); i.has_next(); )
125: add_connection_to_status_cache_table(*i.next(), table);
1.3 paf 126: }
1.22 paf 127:
1.17 paf 128: Value* Stylesheet_manager::get_status() {
129: VHash* result=new VHash;
1.2 paf 130: // cache
131: {
1.22 paf 132: ArrayString& columns=*new ArrayString;
1.17 paf 133: columns+=new String("file");
134: columns+=new String("time");
1.22 paf 135: Table& table=*new Table(&columns, connection_cache.count());
1.2 paf 136:
137: connection_cache.for_each(add_connections_to_status_cache_table, &table);
138:
1.22 paf 139: result->get_hash()->put(*new String("cache"), new VTable(&table));
1.2 paf 140: }
141: return result;
142: }
143:
1.1 parser 144: #endif
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