Annotation of parser3/src/classes/hashfile.C, revision 1.18
1.1 parser 1: /** @file
2: Parser: @b hashfile parser class.
3:
4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.15 paf 5: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1 parser 6:
1.18 ! paf 7: $Id: hashfile.C,v 1.17 2001/12/07 15:24:46 paf Exp $
1.1 parser 8: */
9:
10: #include "pa_config_includes.h"
1.4 parser 11: #include "classes.h"
1.13 paf 12: #ifdef DB2
1.1 parser 13:
14: #include "pa_request.h"
15: #include "pa_vhashfile.h"
16: #include "pa_vhash.h"
17:
18: // defines
19:
20: #define HASH_CLASS_NAME "hashfile"
21:
22: // class
23:
24: class MHashfile : public Methoded {
25: public: // VStateless_class
26: Value *create_new_value(Pool& pool) { return new(pool) VHashfile(pool); }
27:
28: public:
29: MHashfile(Pool& pool);
30: public: // Methoded
31: bool used_directly() { return true; }
32: };
33:
34: // methods
35:
1.3 parser 36: static void _open(Request& r, const String& method_name, MethodParams *params) {
1.1 parser 37: Pool& pool=r.pool();
38: VHashfile& self=*static_cast<VHashfile *>(r.self);
39:
1.11 paf 40: self.assign(
1.18 ! paf 41: r.absolute(params->as_string(0, "DB_HOME must be string")),
1.11 paf 42: params->as_string(1, "filename must be string")
1.9 paf 43: );
44: }
1.1 parser 45:
1.3 parser 46: static void _transaction(Request& r, const String& method_name, MethodParams *params) {
47: Pool& pool=r.pool();
48: VHashfile& self=*static_cast<VHashfile *>(r.self);
49:
50: // body code
51: Value& body_code=params->as_junction(0, "body must be code");
52:
1.9 paf 53: // table
1.11 paf 54: DB_Table_ptr table_ptr=self.get_table_ptr(&method_name);
1.3 parser 55:
56: // transaction
1.11 paf 57: DB_Transaction transaction(pool, *table_ptr, self.current_transaction);
1.3 parser 58:
59: // execute body
60: try {
61: r.write_assign_lang(r.process(body_code));
62: } catch(...) { // process/commit problem
63: transaction.mark_to_rollback();
64:
65: /*re*/throw;
66: }
67: }
68:
1.5 parser 69: static void _hash(Request& r, const String& method_name, MethodParams *params) {
70: Pool& pool=r.pool();
71: VHashfile& self=*static_cast<VHashfile *>(r.self);
72:
73: // write out result
74: VHash& result=*new(pool) VHash(pool, *self.get_hash(&method_name));
75: result.set_name(method_name);
76: r.write_no_lang(result);
77: }
78:
1.7 parser 79: static void _cache(Request& r, const String& method_name, MethodParams *params) {
80: Pool& pool=r.pool();
81: VHashfile& self=*static_cast<VHashfile *>(r.self);
82:
83: // key, expires, body code
84: const String &key=params->as_string(0, "key must be string");
1.16 paf 85: time_t lifespan=(time_t)params->as_double(1, "lifespan must be number", r);
1.7 parser 86: Value& body_code=params->as_junction(2, "body must be code");
87:
88: // transaction
1.17 paf 89: //// DB_Transaction transaction(pool, *self.get_table_ptr(&method_name), self.current_transaction);
90: DB_Table_ptr table_ptr=self.get_table_ptr(&method_name);
1.7 parser 91:
92: // execute body
1.17 paf 93: //// try {
1.16 paf 94: if(lifespan) { // 'lifespan' specified? try cached copy...
1.17 paf 95: if(String *cached_body=/*transaction.*/table_ptr->get(self.current_transaction, pool, key, lifespan)) { // have cached copy?
1.7 parser 96: r.write_assign_lang(*cached_body);
97: // happy with it
98: return;
99: }
1.16 paf 100: } else // 'lifespan'=0, forget cached copy
1.17 paf 101: /*transaction.*/table_ptr->remove(self.current_transaction, key);
1.7 parser 102:
1.8 parser 103: // save
104: Autosave_marked_to_cancel_cache saved(self);
105:
1.7 parser 106: // process
107: Value& processed_body=r.process(body_code);
108: r.write_assign_lang(processed_body);
109:
1.16 paf 110: // put it to cache if 'lifespan' specified & never called ^delete[]
111: if(lifespan && !self.marked_to_cancel_cache())
1.17 paf 112: /*transaction.*/table_ptr->put(self.current_transaction, key, processed_body.as_string(), lifespan);
113: //// } catch(...) { // process/commit problem
114: //// transaction.mark_to_rollback();
1.7 parser 115:
1.17 paf 116: //// /*re*/throw;
117: //// }
1.7 parser 118: }
119:
1.8 parser 120: static void _delete(Request& r, const String& method_name, MethodParams *params) {
121: Pool& pool=r.pool();
122: VHashfile& self=*static_cast<VHashfile *>(r.self);
123:
124: if(params->size()==0)
125: self.mark_to_cancel_cache();
126: else {
127: // key
128: const String &key=params->as_string(0, "key must be string");
129: // remove
1.11 paf 130: self.get_table_ptr(&method_name)->remove(self.current_transaction, key);
1.8 parser 131: }
132: }
133:
1.12 paf 134: static void _clear(Request& r, const String& method_name, MethodParams *) {
135: Pool& pool=r.pool();
136: VHashfile& self=*static_cast<VHashfile *>(r.self);
137: DB_Cursor cursor(
138: *self.get_table_ptr(&method_name),
139: self.current_transaction, &method_name);
140:
141: while(true) {
142: if(!cursor.move(DB_NEXT))
143: break;
144:
145: cursor.remove(0/*flags*/);
146: }
147: }
148:
1.14 paf 149: static void _foreach(Request& r, const String& method_name, MethodParams *params) {
150: Pool& pool=r.pool();
151: VHashfile& self=*static_cast<VHashfile *>(r.self);
152:
153: const String& key_var_name=params->as_string(0, "key-var name must be string");
154: const String& value_var_name=params->as_string(1, "value-var name must be string");
155: Value& body_code=params->as_junction(2, "body must be code");
156: Value *delim_maybe_code=params->size()>3?¶ms->get(3):0;
157:
158: bool need_delim=false;
159: Value& var_context=*body_code.get_junction()->wcontext;
160: VString& vkey=*new(pool) VString(pool);
161: VString& vvalue=*new(pool) VString(pool);
162:
163: DB_Cursor cursor(
164: *self.get_table_ptr(&method_name),
165: self.current_transaction, &method_name);
166: while(true) {
167: String *key;
168: String *data;
169: if(!cursor.get(pool, key, data, DB_NEXT))
170: break;
171:
172: if(!key)
173: continue; // expired
174:
175: vkey.set_string(*key);
176: vvalue.set_string(*data);
177: var_context.put_element(key_var_name, &vkey);
178: var_context.put_element(value_var_name, &vvalue);
179:
180: Value& processed_body=r.process(body_code);
181: if(delim_maybe_code) { // delimiter set?
182: const String *string=processed_body.get_string();
183: if(need_delim && string && string->size()) // need delim & iteration produced string?
184: r.write_pass_lang(r.process(*delim_maybe_code));
185: need_delim=true;
186: }
187: r.write_pass_lang(processed_body);
188: }
189: }
190:
1.1 parser 191: // constructor
192:
193: MHashfile::MHashfile(Pool& apool) : Methoded(apool) {
194: set_name(*NEW String(pool(), HASH_CLASS_NAME));
195:
1.9 paf 196: // ^hashfile::open[db_home;filename]
197: add_native_method("open", Method::CT_DYNAMIC, _open, 2, 2);
1.3 parser 198: // ^transaction{code}
199: add_native_method("transaction", Method::CT_DYNAMIC, _transaction, 1, 1);
1.5 parser 200: // ^hash[]
201: add_native_method("hash", Method::CT_DYNAMIC, _hash, 0, 0);
1.1 parser 202: // ^cache[key](seconds){code}
203: add_native_method("cache", Method::CT_DYNAMIC, _cache, 3, 3);
1.8 parser 204: // ^hashfile.delete[key]
205: add_native_method("delete", Method::CT_DYNAMIC, _delete, 0, 1);
1.12 paf 206: // ^hashfile.clear[]
207: add_native_method("clear", Method::CT_DYNAMIC, _clear, 0, 0);
1.14 paf 208: // ^hashfile.foreach[key;value]{code}[delim]
209: add_native_method("foreach", Method::CT_DYNAMIC, _foreach, 2+1, 2+1+1);
1.1 parser 210: }
211:
212: // global variable
213:
214: Methoded *hashfile_base_class;
215:
1.4 parser 216: #endif
217:
1.1 parser 218: // creator
219:
220: Methoded *MHashfile_create(Pool& pool) {
1.4 parser 221: return
1.13 paf 222: #ifdef DB2
1.4 parser 223: hashfile_base_class=new(pool) MHashfile(pool)
224: #else
225: 0
226: #endif
227: ;
1.1 parser 228: }
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