--- parser3/src/classes/hashfile.C 2001/10/22 16:44:42 1.2 +++ parser3/src/classes/hashfile.C 2001/12/24 09:05:34 1.19 @@ -2,15 +2,15 @@ Parser: @b hashfile parser class. Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) - Author: Alexander Petrosyan (http://design.ru/paf) + Author: Alexander Petrosyan (http://paf.design.ru) - $Id: hashfile.C,v 1.2 2001/10/22 16:44:42 parser Exp $ + $Id: hashfile.C,v 1.19 2001/12/24 09:05:34 paf Exp $ */ #include "pa_config_includes.h" -#ifdef HAVE_LIBDB - #include "classes.h" +#ifdef DB2 + #include "pa_request.h" #include "pa_vhashfile.h" #include "pa_vhash.h" @@ -33,47 +33,187 @@ public: // Methoded // methods -static void _assign(Request& r, const String& method_name, MethodParams *params) { +static void _open(Request& r, const String& method_name, MethodParams *params) { + Pool& pool=r.pool(); + VHashfile& self=*static_cast(r.self); + + self.assign( + r.absolute(params->as_string(0, "DB_HOME must be string")), + params->as_string(1, "filename must be string") + ); +} + +static void _transaction(Request& r, const String& method_name, MethodParams *params) { + Pool& pool=r.pool(); + VHashfile& self=*static_cast(r.self); + + // body code + Value& body_code=params->as_junction(0, "body must be code"); + + // table + DB_Table_ptr table_ptr=self.get_table_ptr(&method_name); + + // transaction + DB_Transaction transaction(pool, *table_ptr, self.current_transaction); + + // execute body + try { + r.write_assign_lang(r.process(body_code)); + } catch(...) { // process/commit problem + transaction.mark_to_rollback(); + + /*re*/throw; + } +} + +static void _hash(Request& r, const String& method_name, MethodParams *params) { + Pool& pool=r.pool(); + VHashfile& self=*static_cast(r.self); + + // write out result + VHash& result=*new(pool) VHash(pool, *self.get_hash(&method_name)); + result.set_name(method_name); + r.write_no_lang(result); +} + +static void _cache(Request& r, const String& method_name, MethodParams *params) { + Pool& pool=r.pool(); + VHashfile& self=*static_cast(r.self); + + // key, expires, body code + const String &key=params->as_string(0, "key must be string"); + time_t lifespan=(time_t)params->as_double(1, "lifespan must be number", r); + Value& body_code=params->as_junction(2, "body must be code"); + + DB_Table_ptr table_ptr=self.get_table_ptr(&method_name); + + if(lifespan) { // 'lifespan' specified? try cached copy... + if(String *cached_body=table_ptr->get(self.current_transaction, pool, key, lifespan)) { // have cached copy? + r.write_assign_lang(*cached_body); + // happy with it + return; + } + } else // 'lifespan'=0, forget cached copy + table_ptr->remove(self.current_transaction, key); + + // save + Autosave_marked_to_cancel_cache saved(self); + + // process + Value& processed_body=r.process(body_code); + r.write_assign_lang(processed_body); + + // put it to cache if 'lifespan' specified & never called ^delete[] + if(lifespan && !self.marked_to_cancel_cache()) + table_ptr->put(self.current_transaction, key, processed_body.as_string(), lifespan); +} + +static void _delete(Request& r, const String& method_name, MethodParams *params) { Pool& pool=r.pool(); VHashfile& self=*static_cast(r.self); - const String &sfile_spec=params->as_string(0, "filename must be string"); + if(params->size()==0) + self.mark_to_cancel_cache(); + else { + // key + const String &key=params->as_string(0, "key must be string"); + // remove + self.get_table_ptr(&method_name)->remove(self.current_transaction, key); + } +} + +static void _clear(Request& r, const String& method_name, MethodParams *) { + Pool& pool=r.pool(); + VHashfile& self=*static_cast(r.self); + DB_Cursor cursor( + *self.get_table_ptr(&method_name), + self.current_transaction, &method_name); + + while(true) { + if(!cursor.move(DB_NEXT)) + break; + + cursor.remove(0/*flags*/); + } +} + +static void _foreach(Request& r, const String& method_name, MethodParams *params) { + Pool& pool=r.pool(); + VHashfile& self=*static_cast(r.self); - self.assign(r.absolute(sfile_spec), method_name); + const String& key_var_name=params->as_string(0, "key-var name must be string"); + const String& value_var_name=params->as_string(1, "value-var name must be string"); + Value& body_code=params->as_junction(2, "body must be code"); + Value *delim_maybe_code=params->size()>3?¶ms->get(3):0; + + bool need_delim=false; + Value& var_context=*body_code.get_junction()->wcontext; + VString& vkey=*new(pool) VString(pool); + VString& vvalue=*new(pool) VString(pool); + + DB_Cursor cursor( + *self.get_table_ptr(&method_name), + self.current_transaction, &method_name); + while(true) { + String *key; + String *data; + if(!cursor.get(pool, key, data, DB_NEXT)) + break; + + if(!key) + continue; // expired + + vkey.set_string(*key); + vvalue.set_string(*data); + var_context.put_element(key_var_name, &vkey); + var_context.put_element(value_var_name, &vvalue); + + Value& processed_body=r.process(body_code); + if(delim_maybe_code) { // delimiter set? + const String *string=processed_body.get_string(); + if(need_delim && string && string->size()) // need delim & iteration produced string? + r.write_pass_lang(r.process(*delim_maybe_code)); + need_delim=true; + } + r.write_pass_lang(processed_body); + } } -//static_cast(r.self) const String& file_spec=->file_spec(); // constructor MHashfile::MHashfile(Pool& apool) : Methoded(apool) { set_name(*NEW String(pool(), HASH_CLASS_NAME)); - // ^hashfile::assign[filename] - add_native_method("assign", Method::CT_DYNAMIC, _assign, 1, 1); -/* + // ^hashfile::open[db_home;filename] + add_native_method("open", Method::CT_DYNAMIC, _open, 2, 2); + // ^transaction{code} + add_native_method("transaction", Method::CT_DYNAMIC, _transaction, 1, 1); + // ^hash[] + add_native_method("hash", Method::CT_DYNAMIC, _hash, 0, 0); + // ^cache[key](seconds){code} + add_native_method("cache", Method::CT_DYNAMIC, _cache, 3, 3); // ^hashfile.delete[key] - add_native_method("delete", Method::CT_DYNAMIC, _delete, 1, 1); + add_native_method("delete", Method::CT_DYNAMIC, _delete, 0, 1); // ^hashfile.clear[] add_native_method("clear", Method::CT_DYNAMIC, _clear, 0, 0); - // ^cache[key](seconds){code} - add_native_method("cache", Method::CT_DYNAMIC, _cache, 3, 3); - // ^cancel[] - add_native_method("cancel", Method::CT_DYNAMIC, _cancel, 0, 0); - // ^lock{code} - add_native_method("lock", Method::CT_DYNAMIC, _lock, 1, 1); - // ^pack[] - add_native_method("pack", Method::CT_DYNAMIC, _pack, 0, 0); - */ + // ^hashfile.foreach[key;value]{code}[delim] + add_native_method("foreach", Method::CT_DYNAMIC, _foreach, 2+1, 2+1+1); } // global variable Methoded *hashfile_base_class; +#endif + // creator Methoded *MHashfile_create(Pool& pool) { - return hashfile_base_class=new(pool) MHashfile(pool); -} - + return +#ifdef DB2 + hashfile_base_class=new(pool) MHashfile(pool) +#else + 0 #endif + ; +}