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server.h

00001 //-< SERVER.CPP >----------------------------------------------------*--------*
00002 // GigaBASE                  Version 1.0         (c) 1999  GARRET    *     ?  *
00003 // (Post Relational Database Management System)                      *   /\|  *
00004 //                                                                   *  /  \  *
00005 //                          Created:     13-Jan-2000  K.A. Knizhnik  * / [] \ *
00006 //                          Last update: 13-Jan-2000  K.A. Knizhnik  * GARRET *
00007 //-------------------------------------------------------------------*--------*
00008 // CLI multithreaded server class
00009 //-------------------------------------------------------------------*--------*
00010 
00011 #ifndef __SERVER_H__
00012 #define __SERVER_H__
00013 
00014 #include "sockio.h"
00015 
00016 BEGIN_GIGABASE_NAMESPACE
00017 
00018 class dbColumnBinding {
00019   public:
00020     dbColumnBinding*   next;
00021     dbFieldDescriptor* fd;
00022     int                cliType;
00023     int                len;
00024     char*              ptr;
00025 
00026     int  unpackArray(char* dst, size_t& offs);
00027     void unpackScalar(char* dst);
00028 
00029     dbColumnBinding(dbFieldDescriptor* field, int type) {
00030         fd = field;
00031         cliType = type;
00032         next = NULL;
00033     }
00034 };
00035 
00036 struct dbParameterBinding {
00037     union {
00038         int1       i1;
00039         int2       i2;
00040         int4       i4;
00041         db_int8    i8;
00042         real4      r4;
00043         real8      r8;
00044         oid_t      oid;
00045         bool       b;
00046         char_t*    str;
00047         rectangle  rect;
00048     } u;
00049     int type;
00050 };
00051 
00052 const int dbQueryMaxIdLength = 256;
00053 
00054 class dbQueryScanner {
00055   public:
00056     char*    p;
00057     db_int8  ival;
00058     real8    fval;
00059     char_t   buf[dbQueryMaxIdLength];
00060     char_t*  ident;
00061 
00062     int  get();
00063 
00064     void reset(char* sql) {
00065         p = sql;
00066     }
00067 };
00068 
00069 class dbStatement {
00070   public:
00071     int                 id;
00072     bool                firstFetch;
00073     dbStatement*        next;
00074     dbAnyCursor*        cursor;
00075     dbQuery             query;
00076     dbColumnBinding*    columns;
00077     char*               buf;
00078     int                 buf_size;
00079     int                 n_params;
00080     int                 n_columns;
00081     dbParameterBinding* params;
00082     dbTableDescriptor*  table;
00083 
00084     void reset();
00085 
00086     dbStatement(int stmt_id) {
00087         id = stmt_id;
00088         columns = NULL;
00089         params = NULL;
00090         buf = NULL;
00091         buf_size = 0;
00092         table = NULL;
00093         cursor = NULL; 
00094     }
00095     ~dbStatement() {
00096         reset();
00097         delete[] buf;
00098     }
00099 };
00100 
00101 struct UserInfo {
00102     char_t const* user;
00103     char_t const* password;
00104 
00105     TYPE_DESCRIPTOR((KEY(user, INDEXED), FIELD(password)));
00106 };
00107 
00108 
00109 class dbSession {
00110   public:
00111     dbSession*         next;
00112     dbStatement*       stmts;
00113     dbQueryScanner     scanner;
00114     socket_t*          sock;
00115     bool               in_transaction;
00116     dbTableDescriptor* dropped_tables;
00117     dbTableDescriptor* existed_tables;
00118  };
00119 
00120 class dbServer {
00121   protected:
00122     static dbServer* chain;
00123     dbServer*        next;
00124     char_t*          URL;
00125     char*            address;
00126     dbSession*       freeList;
00127     dbSession*       waitList;
00128     dbSession*       activeList;
00129     int              optimalNumberOfThreads;
00130     int              connectionQueueLen;
00131     int              nActiveThreads;
00132     int              nIdleThreads;
00133     int              waitListLength;
00134     bool             cancelWait;
00135     bool             cancelAccept;
00136     bool             cancelSession;
00137     dbMutex          mutex;
00138     dbSemaphore      go;
00139     dbSemaphore      done;
00140     socket_t*        globalAcceptSock;
00141     socket_t*        localAcceptSock;
00142     dbThread         localAcceptThread;
00143     dbThread         globalAcceptThread;
00144     dbDatabase*      db;
00145 
00146     static void thread_proc serverThread(void* arg);
00147     static void thread_proc acceptLocalThread(void* arg);
00148     static void thread_proc acceptGlobalThread(void* arg);
00149 
00150     void serveClient();
00151     void acceptConnection(socket_t* sock);
00152 
00153     bool freeze(dbSession* session, int stmt_id);
00154     bool unfreeze(dbSession* session, int stmt_id);
00155     bool get_first(dbSession* session, int stmt_id);
00156     bool get_last(dbSession* session, int stmt_id);
00157     bool get_next(dbSession* session, int stmt_id);
00158     bool get_prev(dbSession* session, int stmt_id);
00159     bool seek(dbSession* session, int stmt_id, char* buf);
00160     bool skip(dbSession* session, int stmt_id, char* buf);
00161     bool fetch(dbSession* session, dbStatement* stmt, oid_t result);
00162     bool fetch(dbSession* session, dbStatement* stmt) { 
00163         return fetch(session, stmt, stmt->cursor->currId);
00164     }
00165     bool remove(dbSession* session, int stmt_id);
00166     bool update(dbSession* session, int stmt_id, char* new_data);
00167     bool insert(dbSession* session, int stmt_id, char* data, bool prepare);
00168     bool select(dbSession* session, int stmt_id, char* data, bool prepare);
00169     bool show_tables(dbSession* session); 
00170     bool describe_table(dbSession* session, char* data);
00171     bool update_table(dbSession* session, char* data, bool create);
00172     bool drop_table(dbSession* session, char* data);
00173     bool alter_index(dbSession* session, char* data);
00174     bool authenticate(char* buf);
00175 
00176     char* checkColumns(dbStatement* stmt, int n_columns,
00177                        dbTableDescriptor* desc, char* data,
00178                        int4& reponse, bool select);
00179 
00180     dbStatement* findStatement(dbSession* stmt, int stmt_id);
00181 
00182   public:
00183 
00184     static dbServer* find(char_t const* serverURL);
00185     static void      cleanup();
00186 
00187     void stop();
00188     void start();
00189 
00190     dbServer(dbDatabase* db,
00191              char_t const* serverURL,
00192              int optimalNumberOfThreads = 8,
00193              int connectionQueueLen = 64);
00194     ~dbServer();
00195 };
00196 
00197 END_GIGABASE_NAMESPACE
00198 
00199 #endif

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