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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997-2004
* Sleepycat Software. All rights reserved.
*
* $Id: db_cxx.in,v 11.147 2004/10/07 21:39:48 bostic Exp $
*/
#ifndef _DB_CXX_H_
#define _DB_CXX_H_
//
// C++ assumptions:
//
// To ensure portability to many platforms, both new and old, we make
// few assumptions about the C++ compiler and library. For example,
// we do not expect STL, templates or namespaces to be available. The
// "newest" C++ feature used is exceptions, which are used liberally
// to transmit error information. Even the use of exceptions can be
// disabled at runtime, to do so, use the DB_CXX_NO_EXCEPTIONS flags
// with the DbEnv or Db constructor.
//
// C++ naming conventions:
//
// - All top level class names start with Db.
// - All class members start with lower case letter.
// - All private data members are suffixed with underscore.
// - Use underscores to divide names into multiple words.
// - Simple data accessors are named with get_ or set_ prefix.
// - All method names are taken from names of functions in the C
// layer of db (usually by dropping a prefix like "db_").
// These methods have the same argument types and order,
// other than dropping the explicit arg that acts as "this".
//
// As a rule, each DbFoo object has exactly one underlying DB_FOO struct
// (defined in db.h) associated with it. In some cases, we inherit directly
// from the DB_FOO structure to make this relationship explicit. Often,
// the underlying C layer allocates and deallocates these structures, so
// there is no easy way to add any data to the DbFoo class. When you see
// a comment about whether data is permitted to be added, this is what
// is going on. Of course, if we need to add data to such C++ classes
// in the future, we will arrange to have an indirect pointer to the
// DB_FOO struct (as some of the classes already have).
//
////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
//
// Forward declarations
//
#include <stdarg.h>
#define HAVE_CXX_STDHEADERS 1
#ifdef HAVE_CXX_STDHEADERS
#include <iostream>
#include <exception>
#define __DB_STD(x) std::x
#else
#include <iostream.h>
#include <exception.h>
#define __DB_STD(x) x
#endif
#include "db.h"
class Db; // forward
class Dbc; // forward
class DbEnv; // forward
class DbInfo; // forward
class DbLock; // forward
class DbLogc; // forward
class DbLsn; // forward
class DbMpoolFile; // forward
class DbPreplist; // forward
class Dbt; // forward
class DbTxn; // forward
class DbLock; // forward
class DbSequence; // forward
class Dbt; // forward
class DbMultipleIterator; // forward
class DbMultipleKeyDataIterator; // forward
class DbMultipleRecnoDataIterator; // forward
class DbMultipleDataIterator; // forward
class DbException; // forward
class DbDeadlockException; // forward
class DbLockNotGrantedException; // forward
class DbMemoryException; // forward
class DbRunRecoveryException; // forward
////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
//
// Turn off inappropriate compiler warnings
//
#ifdef _MSC_VER
// These are level 4 warnings that are explicitly disabled.
// With Visual C++, by default you do not see above level 3 unless
// you use /W4. But we like to compile with the highest level
// warnings to catch other errors.
//
// 4201: nameless struct/union
// triggered by standard include file <winnt.h>
//
// 4514: unreferenced inline function has been removed
// certain include files in MSVC define methods that are not called
//
#pragma warning(disable: 4201 4514)
#endif
////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
//
// Mechanisms for declaring classes
//
//
// Every class defined in this file has an _exported next to the class name.
// This is needed for WinTel machines so that the class methods can
// be exported or imported in a DLL as appropriate. Users of the DLL
// use the define DB_USE_DLL. When the DLL is built, DB_CREATE_DLL
// must be defined.
//
#if defined(_MSC_VER)
# if defined(DB_CREATE_DLL)
# define _exported __declspec(dllexport) // creator of dll
# elif defined(DB_USE_DLL)
# define _exported __declspec(dllimport) // user of dll
# else
# define _exported // static lib creator or user
# endif
#else /* _MSC_VER */
# define _exported
#endif /* _MSC_VER */
// Some interfaces can be customized by allowing users to define
// callback functions. For performance and logistical reasons, some
// callback functions must be declared in extern "C" blocks. For others,
// we allow you to declare the callbacks in C++ or C (or an extern "C"
// block) as you wish. See the set methods for the callbacks for
// the choices.
//
extern "C" {
typedef void * (*db_malloc_fcn_type)
(size_t);
typedef void * (*db_realloc_fcn_type)
(void *, size_t);
typedef void (*db_free_fcn_type)
(void *);
typedef int (*bt_compare_fcn_type) /*C++ version available*/
(DB *, const DBT *, const DBT *);
typedef size_t (*bt_prefix_fcn_type) /*C++ version available*/
(DB *, const DBT *, const DBT *);
typedef int (*dup_compare_fcn_type) /*C++ version available*/
(DB *, const DBT *, const DBT *);
typedef u_int32_t (*h_hash_fcn_type) /*C++ version available*/
(DB *, const void *, u_int32_t);
typedef int (*pgin_fcn_type)
(DB_ENV *dbenv, db_pgno_t pgno, void *pgaddr, DBT *pgcookie);
typedef int (*pgout_fcn_type)
(DB_ENV *dbenv, db_pgno_t pgno, void *pgaddr, DBT *pgcookie);
}
//
// Represents a database table = a set of keys with associated values.
//
class _exported Db
{
friend class DbEnv;
public:
Db(DbEnv*, u_int32_t); // create a Db object, then call open()
virtual ~Db(); // does *not* call close.
// These methods exactly match those in the C interface.
//
virtual int associate(DbTxn *txn, Db *secondary,
int (*callback)(Db *, const Dbt *, const Dbt *, Dbt *),
u_int32_t flags);
virtual int close(u_int32_t flags);
virtual int cursor(DbTxn *txnid, Dbc **cursorp, u_int32_t flags);
virtual int del(DbTxn *txnid, Dbt *key, u_int32_t flags);
virtual void err(int, const char *, ...);
virtual void errx(const char *, ...);
virtual int fd(int *fdp);
virtual int get(DbTxn *txnid, Dbt *key, Dbt *data, u_int32_t flags);
virtual void *get_app_private() const;
virtual int get_byteswapped(int *);
virtual int get_dbname(const char **, const char **);
virtual int get_open_flags(u_int32_t *);
virtual int get_type(DBTYPE *);
virtual int get_transactional();
virtual int join(Dbc **curslist, Dbc **dbcp, u_int32_t flags);
virtual int key_range(DbTxn *, Dbt *, DB_KEY_RANGE *, u_int32_t);
virtual int open(DbTxn *txnid,
const char *, const char *subname, DBTYPE, u_int32_t, int);
virtual int pget(DbTxn *txnid, Dbt *key, Dbt *pkey, Dbt *data,
u_int32_t flags);
virtual int put(DbTxn *, Dbt *, Dbt *, u_int32_t);
virtual int remove(const char *, const char *, u_int32_t);
virtual int rename(const char *, const char *, const char *, u_int32_t);
virtual int set_alloc(db_malloc_fcn_type, db_realloc_fcn_type,
db_free_fcn_type);
virtual void set_app_private(void *);
virtual int set_append_recno(int (*)(Db *, Dbt *, db_recno_t));
virtual int set_bt_compare(bt_compare_fcn_type); /*deprecated*/
virtual int set_bt_compare(int (*)(Db *, const Dbt *, const Dbt *));
virtual int set_bt_maxkey(u_int32_t);
virtual int get_bt_minkey(u_int32_t *);
virtual int set_bt_minkey(u_int32_t);
virtual int set_bt_prefix(bt_prefix_fcn_type); /*deprecated*/
virtual int set_bt_prefix(size_t (*)(Db *, const Dbt *, const Dbt *));
virtual int get_cachesize(u_int32_t *, u_int32_t *, int *);
virtual int set_cachesize(u_int32_t, u_int32_t, int);
virtual int set_dup_compare(dup_compare_fcn_type); /*deprecated*/
virtual int set_dup_compare(int (*)(Db *, const Dbt *, const Dbt *));
virtual int get_encrypt_flags(u_int32_t *);
virtual int set_encrypt(const char *, u_int32_t);
virtual void set_errcall(
void (*)(const DbEnv *, const char *, const char *));
virtual void get_errfile(FILE **);
virtual void set_errfile(FILE *);
virtual void get_errpfx(const char **);
virtual void set_errpfx(const char *);
virtual int set_feedback(void (*)(Db *, int, int));
virtual int get_flags(u_int32_t *);
virtual int set_flags(u_int32_t);
virtual int get_h_ffactor(u_int32_t *);
virtual int set_h_ffactor(u_int32_t);
virtual int set_h_hash(h_hash_fcn_type); /*deprecated*/
virtual int set_h_hash(u_int32_t (*)(Db *, const void *, u_int32_t));
virtual int get_h_nelem(u_int32_t *);
virtual int set_h_nelem(u_int32_t);
virtual int get_lorder(int *);
virtual int set_lorder(int);
virtual void set_msgcall(void (*)(const DbEnv *, const char *));
virtual void get_msgfile(FILE **);
virtual void set_msgfile(FILE *);
virtual int get_pagesize(u_int32_t *);
virtual int set_pagesize(u_int32_t);
virtual int set_paniccall(void (*)(DbEnv *, int));
virtual int get_re_delim(int *);
virtual int set_re_delim(int);
virtual int get_re_len(u_int32_t *);
virtual int set_re_len(u_int32_t);
virtual int get_re_pad(int *);
virtual int set_re_pad(int);
virtual int get_re_source(const char **);
virtual int set_re_source(const char *);
virtual int get_q_extentsize(u_int32_t *);
virtual int set_q_extentsize(u_int32_t);
virtual int stat(DbTxn *, void *sp, u_int32_t flags);
virtual int stat_print(u_int32_t flags);
virtual int sync(u_int32_t flags);
virtual int truncate(DbTxn *, u_int32_t *, u_int32_t);
virtual int upgrade(const char *name, u_int32_t flags);
virtual int verify(const char *, const char *, __DB_STD(ostream) *,
u_int32_t);
// These additional methods are not in the C interface, and
// are only available for C++.
//
virtual __DB_STD(ostream) *get_error_stream();
virtual void set_error_stream(__DB_STD(ostream) *);
virtual __DB_STD(ostream) *get_message_stream();
virtual void set_message_stream(__DB_STD(ostream) *);
virtual DbEnv *get_env();
virtual DbMpoolFile *get_mpf();
virtual DB *get_DB()
{
return imp_;
}
virtual const DB *get_const_DB() const
{
return imp_;
}
static Db* get_Db(DB *db)
{
return (Db *)db->api_internal;
}
static const Db* get_const_Db(const DB *db)
{
return (const Db *)db->api_internal;
}
private:
// no copying
Db(const Db &);
Db &operator = (const Db &);
void cleanup();
int initialize();
int error_policy();
// instance data
DB *imp_;
DbEnv *env_;
DbMpoolFile *mpf_;
int construct_error_;
u_int32_t flags_;
u_int32_t construct_flags_;
public:
// These are public only because they need to be called
// via C callback functions. They should never be used by
// external users of this class.
//
int (*append_recno_callback_)(Db *, Dbt *, db_recno_t);
int (*associate_callback_)(Db *, const Dbt *, const Dbt *, Dbt *);
int (*bt_compare_callback_)(Db *, const Dbt *, const Dbt *);
size_t (*bt_prefix_callback_)(Db *, const Dbt *, const Dbt *);
int (*dup_compare_callback_)(Db *, const Dbt *, const Dbt *);
void (*feedback_callback_)(Db *, int, int);
u_int32_t (*h_hash_callback_)(Db *, const void *, u_int32_t);
};
//
// Cursor
//
class _exported Dbc : protected DBC
{
friend class Db;
public:
int close();
int count(db_recno_t *countp, u_int32_t flags);
int del(u_int32_t flags);
int dup(Dbc** cursorp, u_int32_t flags);
int get(Dbt* key, Dbt *data, u_int32_t flags);
int pget(Dbt* key, Dbt* pkey, Dbt *data, u_int32_t flags);
int put(Dbt* key, Dbt *data, u_int32_t flags);
private:
// No data is permitted in this class (see comment at top)
// Note: use Db::cursor() to get pointers to a Dbc,
// and call Dbc::close() rather than delete to release them.
//
Dbc();
~Dbc();
// no copying
Dbc(const Dbc &);
Dbc &operator = (const Dbc &);
};
//
// Berkeley DB environment class. Provides functions for opening databases.
// User of this library can use this class as a starting point for
// developing a DB application - derive their application class from
// this one, add application control logic.
//
// Note that if you use the default constructor, you must explicitly
// call appinit() before any other db activity (e.g. opening files)
//
class _exported DbEnv
{
friend class Db;
friend class DbLock;
friend class DbMpoolFile;
public:
// After using this constructor, you can set any needed
// parameters for the environment using the set_* methods.
// Then call open() to finish initializing the environment
// and attaching it to underlying files.
//
DbEnv(u_int32_t flags);
virtual ~DbEnv();
// These methods match those in the C interface.
//
virtual int close(u_int32_t);
virtual int dbremove(DbTxn *txn, const char *name, const char *subdb,
u_int32_t flags);
virtual int dbrename(DbTxn *txn, const char *name, const char *subdb,
const char *newname, u_int32_t flags);
virtual void err(int, const char *, ...);
virtual void errx(const char *, ...);
virtual void *get_app_private() const;
virtual int get_home(const char **);
virtual int get_open_flags(u_int32_t *);
virtual int open(const char *, u_int32_t, int);
virtual int remove(const char *, u_int32_t);
virtual int set_alloc(db_malloc_fcn_type, db_realloc_fcn_type,
db_free_fcn_type);
virtual void set_app_private(void *);
virtual int get_cachesize(u_int32_t *, u_int32_t *, int *);
virtual int set_cachesize(u_int32_t, u_int32_t, int);
virtual int get_data_dirs(const char ***);
virtual int set_data_dir(const char *);
virtual int get_encrypt_flags(u_int32_t *);
virtual int set_encrypt(const char *, u_int32_t);
virtual void set_errcall(
void (*)(const DbEnv *, const char *, const char *));
virtual void get_errfile(FILE **);
virtual void set_errfile(FILE *);
virtual void get_errpfx(const char **);
virtual void set_errpfx(const char *);
virtual int get_flags(u_int32_t *);
virtual int set_flags(u_int32_t, int);
virtual int set_feedback(void (*)(DbEnv *, int, int));
virtual int get_lg_bsize(u_int32_t *);
virtual int set_lg_bsize(u_int32_t);
virtual int get_lg_dir(const char **);
virtual int set_lg_dir(const char *);
virtual int get_lg_max(u_int32_t *);
virtual int set_lg_max(u_int32_t);
virtual int get_lg_regionmax(u_int32_t *);
virtual int set_lg_regionmax(u_int32_t);
virtual int get_lk_conflicts(const u_int8_t **, int *);
virtual int set_lk_conflicts(u_int8_t *, int);
virtual int get_lk_detect(u_int32_t *);
virtual int set_lk_detect(u_int32_t);
virtual int set_lk_max(u_int32_t);
virtual int get_lk_max_lockers(u_int32_t *);
virtual int set_lk_max_lockers(u_int32_t);
virtual int get_lk_max_locks(u_int32_t *);
virtual int set_lk_max_locks(u_int32_t);
virtual int get_lk_max_objects(u_int32_t *);
virtual int set_lk_max_objects(u_int32_t);
virtual int get_mp_mmapsize(size_t *);
virtual int set_mp_mmapsize(size_t);
virtual void set_msgcall(void (*)(const DbEnv *, const char *));
virtual void get_msgfile(FILE **);
virtual void set_msgfile(FILE *);
virtual int set_paniccall(void (*)(DbEnv *, int));
virtual int set_rpc_server(void *, char *, long, long, u_int32_t);
virtual int get_shm_key(long *);
virtual int set_shm_key(long);
virtual int get_timeout(db_timeout_t *, u_int32_t);
virtual int set_timeout(db_timeout_t, u_int32_t);
virtual int get_tmp_dir(const char **);
virtual int set_tmp_dir(const char *);
virtual int get_tas_spins(u_int32_t *);
virtual int set_tas_spins(u_int32_t);
virtual int get_tx_max(u_int32_t *);
virtual int set_tx_max(u_int32_t);
virtual int set_app_dispatch(int (*)(DbEnv *,
Dbt *, DbLsn *, db_recops));
virtual int get_tx_timestamp(time_t *);
virtual int set_tx_timestamp(time_t *);
virtual int get_verbose(u_int32_t which, int *);
virtual int set_verbose(u_int32_t which, int);
// Version information. A static method so it can be obtained anytime.
//
static char *version(int *major, int *minor, int *patch);
// Convert DB errors to strings
static char *strerror(int);
// If an error is detected and the error call function
// or stream is set, a message is dispatched or printed.
// If a prefix is set, each message is prefixed.
//
// You can use set_errcall() or set_errfile() above to control
// error functionality. Alternatively, you can call
// set_error_stream() to force all errors to a C++ stream.
// It is unwise to mix these approaches.
//
virtual __DB_STD(ostream) *get_error_stream();
virtual void set_error_stream(__DB_STD(ostream) *);
virtual __DB_STD(ostream) *get_message_stream();
virtual void set_message_stream(__DB_STD(ostream) *);
// used internally
static void runtime_error(DbEnv *env, const char *caller, int err,
int error_policy);
static void runtime_error_dbt(DbEnv *env, const char *caller, Dbt *dbt,
int error_policy);
static void runtime_error_lock_get(DbEnv *env, const char *caller,
int err, db_lockop_t op, db_lockmode_t mode,
const Dbt *obj, DbLock lock, int index,
int error_policy);
// Lock functions
//
virtual int lock_detect(u_int32_t flags, u_int32_t atype, int *aborted);
virtual int lock_get(u_int32_t locker, u_int32_t flags, const Dbt *obj,
db_lockmode_t lock_mode, DbLock *lock);
virtual int lock_id(u_int32_t *idp);
virtual int lock_id_free(u_int32_t id);
virtual int lock_put(DbLock *lock);
virtual int lock_stat(DB_LOCK_STAT **statp, u_int32_t flags);
virtual int lock_stat_print(u_int32_t flags);
virtual int lock_vec(u_int32_t locker, u_int32_t flags,
DB_LOCKREQ list[], int nlist, DB_LOCKREQ **elistp);
// Log functions
//
virtual int log_archive(char **list[], u_int32_t flags);
static int log_compare(const DbLsn *lsn0, const DbLsn *lsn1);
virtual int log_cursor(DbLogc **cursorp, u_int32_t flags);
virtual int log_file(DbLsn *lsn, char *namep, size_t len);
virtual int log_flush(const DbLsn *lsn);
virtual int log_put(DbLsn *lsn, const Dbt *data, u_int32_t flags);
virtual int log_stat(DB_LOG_STAT **spp, u_int32_t flags);
virtual int log_stat_print(u_int32_t flags);
// Mpool functions
//
virtual int memp_fcreate(DbMpoolFile **dbmfp, u_int32_t flags);
virtual int memp_register(int ftype,
pgin_fcn_type pgin_fcn,
pgout_fcn_type pgout_fcn);
virtual int memp_stat(DB_MPOOL_STAT
**gsp, DB_MPOOL_FSTAT ***fsp, u_int32_t flags);
virtual int memp_stat_print(u_int32_t flags);
virtual int memp_sync(DbLsn *lsn);
virtual int memp_trickle(int pct, int *nwrotep);
// Transaction functions
//
virtual int txn_begin(DbTxn *pid, DbTxn **tid, u_int32_t flags);
virtual int txn_checkpoint(u_int32_t kbyte, u_int32_t min,
u_int32_t flags);
virtual int txn_recover(DbPreplist *preplist, long count,
long *retp, u_int32_t flags);
virtual int txn_stat(DB_TXN_STAT **statp, u_int32_t flags);
virtual int txn_stat_print(u_int32_t flags);
// Replication functions
//
virtual int rep_elect(int, int, int, u_int32_t, int *, u_int32_t);
virtual int rep_process_message(Dbt *, Dbt *, int *, DbLsn *);
virtual int rep_start(Dbt *, u_int32_t);
virtual int rep_stat(DB_REP_STAT **statp, u_int32_t flags);
virtual int rep_stat_print(u_int32_t flags);
virtual int get_rep_limit(u_int32_t *, u_int32_t *);
virtual int set_rep_limit(u_int32_t, u_int32_t);
virtual int set_rep_transport(int, int (*)(DbEnv *,
const Dbt *, const Dbt *, const DbLsn *, int, u_int32_t));
// Conversion functions
//
virtual DB_ENV *get_DB_ENV()
{
return imp_;
}
virtual const DB_ENV *get_const_DB_ENV() const
{
return imp_;
}
static DbEnv* get_DbEnv(DB_ENV *dbenv)
{
return dbenv ? (DbEnv *)dbenv->api1_internal : 0;
}
static const DbEnv* get_const_DbEnv(const DB_ENV *dbenv)
{
return dbenv ? (const DbEnv *)dbenv->api1_internal : 0;
}
// For internal use only.
static DbEnv* wrap_DB_ENV(DB_ENV *dbenv);
// These are public only because they need to be called
// via C functions. They should never be called by users
// of this class.
//
static int _app_dispatch_intercept(DB_ENV *env, DBT *dbt, DB_LSN *lsn,
db_recops op);
static void _paniccall_intercept(DB_ENV *env, int errval);
static void _feedback_intercept(DB_ENV *env, int opcode, int pct);
static int _rep_send_intercept(DB_ENV *env,
const DBT *cntrl, const DBT *data,
const DB_LSN *lsn, int id,
u_int32_t flags);
static void _stream_error_function(const DB_ENV *env,
const char *prefix,
const char *message);
static void _stream_message_function(const DB_ENV *env,
const char *message);
private:
void cleanup();
int initialize(DB_ENV *env);
int error_policy();
// For internal use only.
DbEnv(DB_ENV *, u_int32_t flags);
// no copying
DbEnv(const DbEnv &);
void operator = (const DbEnv &);
// instance data
DB_ENV *imp_;
int construct_error_;
u_int32_t construct_flags_;
__DB_STD(ostream) *error_stream_;
__DB_STD(ostream) *message_stream_;
int (*app_dispatch_callback_)(DbEnv *, Dbt *, DbLsn *, db_recops);
void (*error_callback_)(const DbEnv *, const char *, const char *);
void (*feedback_callback_)(DbEnv *, int, int);
void (*message_callback_)(const DbEnv *, const char *);
void (*paniccall_callback_)(DbEnv *, int);
int (*pgin_callback_)(DbEnv *dbenv, db_pgno_t pgno,
void *pgaddr, Dbt *pgcookie);
int (*pgout_callback_)(DbEnv *dbenv, db_pgno_t pgno,
void *pgaddr, Dbt *pgcookie);
int (*rep_send_callback_)(DbEnv *,
const Dbt *, const Dbt *, const DbLsn *, int, u_int32_t);
};
//
// Lock
//
class _exported DbLock
{
friend class DbEnv;
public:
DbLock();
DbLock(const DbLock &);
DbLock &operator = (const DbLock &);
protected:
// We can add data to this class if needed
// since its contained class is not allocated by db.
// (see comment at top)
DbLock(DB_LOCK);
DB_LOCK lock_;
};
//
// Log cursor
//
class _exported DbLogc : protected DB_LOGC
{
friend class DbEnv;
public:
int close(u_int32_t _flags);
int get(DbLsn *lsn, Dbt *data, u_int32_t _flags);
private:
// No data is permitted in this class (see comment at top)
// Note: use Db::cursor() to get pointers to a Dbc,
// and call Dbc::close() rather than delete to release them.
//
DbLogc();
~DbLogc();
// no copying
DbLogc(const Dbc &);
DbLogc &operator = (const Dbc &);
};
//
// Log sequence number
//
class _exported DbLsn : public DB_LSN
{
friend class DbEnv; // friendship needed to cast to base class
friend class DbLogc; // friendship needed to cast to base class
};
//
// Memory pool file
//
class _exported DbMpoolFile
{
friend class DbEnv;
friend class Db;
public:
int close(u_int32_t flags);
int get(db_pgno_t *pgnoaddr, u_int32_t flags, void *pagep);
int open(const char *file, u_int32_t flags, int mode, size_t pagesize);
int get_transactional(void);
int put(void *pgaddr, u_int32_t flags);
int set(void *pgaddr, u_int32_t flags);
int get_clear_len(u_int32_t *len);
int set_clear_len(u_int32_t len);
int get_fileid(u_int8_t *fileid);
int set_fileid(u_int8_t *fileid);
int get_flags(u_int32_t *flagsp);
int set_flags(u_int32_t flags, int onoff);
int get_ftype(int *ftype);
int set_ftype(int ftype);
int get_lsn_offset(int32_t *offsetp);
int set_lsn_offset(int32_t offset);
int get_maxsize(u_int32_t *gbytes, u_int32_t *bytes);
int set_maxsize(u_int32_t gbytes, u_int32_t bytes);
int get_pgcookie(DBT *dbt);
int set_pgcookie(DBT *dbt);
int get_priority(DB_CACHE_PRIORITY *priorityp);
int set_priority(DB_CACHE_PRIORITY priority);
int sync();
virtual DB_MPOOLFILE *get_DB_MPOOLFILE()
{
return imp_;
}
virtual const DB_MPOOLFILE *get_const_DB_MPOOLFILE() const
{
return imp_;
}
private:
DB_MPOOLFILE *imp_;
// We can add data to this class if needed
// since it is implemented via a pointer.
// (see comment at top)
// Note: use DbEnv::memp_fcreate() to get pointers to a DbMpoolFile,
// and call DbMpoolFile::close() rather than delete to release them.
//
DbMpoolFile();
// Shut g++ up.
protected:
virtual ~DbMpoolFile();
private:
// no copying
DbMpoolFile(const DbMpoolFile &);
void operator = (const DbMpoolFile &);
};
//
// This is filled in and returned by the DbEnv::txn_recover() method.
//
class _exported DbPreplist
{
public:
DbTxn *txn;
u_int8_t gid[DB_XIDDATASIZE];
};
//
// A sequence record in a database
//
class _exported DbSequence
{
public:
DbSequence(Db *db, u_int32_t flags);
virtual ~DbSequence();
int open(DbTxn *txnid, Dbt *key, u_int32_t flags);
int initial_value(db_seq_t value);
int close(u_int32_t flags);
int remove(DbTxn *txnid, u_int32_t flags);
int stat(DB_SEQUENCE_STAT **sp, u_int32_t flags);
int stat_print(u_int32_t flags);
int get(DbTxn *txnid, int32_t delta, db_seq_t *retp, u_int32_t flags);
int get_cachesize(int32_t *sizep);
int set_cachesize(int32_t size);
int get_flags(u_int32_t *flagsp);
int set_flags(u_int32_t flags);
int get_range(db_seq_t *minp, db_seq_t *maxp);
int set_range(db_seq_t min, db_seq_t max);
Db *get_db();
Dbt *get_key();
virtual DB_SEQUENCE *get_DB_SEQUENCE()
{
return imp_;
}
virtual const DB_SEQUENCE *get_const_DB_SEQUENCE() const
{
return imp_;
}
static DbSequence* get_DbSequence(DB_SEQUENCE *seq)
{
return (DbSequence *)seq->api_internal;
}
static const DbSequence* get_const_DbSequence(const DB_SEQUENCE *seq)
{
return (const DbSequence *)seq->api_internal;
}
// For internal use only.
static DbSequence* wrap_DB_SEQUENCE(DB_SEQUENCE *seq);
private:
DbSequence(DB_SEQUENCE *seq);
// no copying
DbSequence(const DbSequence &);
DbSequence &operator = (const DbSequence &);
DB_SEQUENCE *imp_;
DBT key_;
};
//
// Transaction
//
class _exported DbTxn
{
friend class DbEnv;
public:
int abort();
int commit(u_int32_t flags);
int discard(u_int32_t flags);
u_int32_t id();
int prepare(u_int8_t *gid);
int set_timeout(db_timeout_t timeout, u_int32_t flags);
virtual DB_TXN *get_DB_TXN()
{
return imp_;
}
virtual const DB_TXN *get_const_DB_TXN() const
{
return imp_;
}
static DbTxn* get_DbTxn(DB_TXN *txn)
{
return (DbTxn *)txn->api_internal;
}
static const DbTxn* get_const_DbTxn(const DB_TXN *txn)
{
return (const DbTxn *)txn->api_internal;
}
// For internal use only.
static DbTxn* wrap_DB_TXN(DB_TXN *txn);
private:
DB_TXN *imp_;
// We can add data to this class if needed
// since it is implemented via a pointer.
// (see comment at top)
// Note: use DbEnv::txn_begin() to get pointers to a DbTxn,
// and call DbTxn::abort() or DbTxn::commit rather than
// delete to release them.
//
DbTxn();
// For internal use only.
DbTxn(DB_TXN *txn);
virtual ~DbTxn();
// no copying
DbTxn(const DbTxn &);
void operator = (const DbTxn &);
};
//
// A chunk of data, maybe a key or value.
//
class _exported Dbt : private DBT
{
friend class Db;
friend class Dbc;
friend class DbEnv;
friend class DbLogc;
friend class DbSequence;
public:
// key/data
void *get_data() const { return data; }
void set_data(void *value) { data = value; }
// key/data length
u_int32_t get_size() const { return size; }
void set_size(u_int32_t value) { size = value; }
// RO: length of user buffer.
u_int32_t get_ulen() const { return ulen; }
void set_ulen(u_int32_t value) { ulen = value; }
// RO: get/put record length.
u_int32_t get_dlen() const { return dlen; }
void set_dlen(u_int32_t value) { dlen = value; }
// RO: get/put record offset.
u_int32_t get_doff() const { return doff; }
void set_doff(u_int32_t value) { doff = value; }
// flags
u_int32_t get_flags() const { return flags; }
void set_flags(u_int32_t value) { flags = value; }
// Conversion functions
DBT *get_DBT() { return (DBT *)this; }
const DBT *get_const_DBT() const { return (const DBT *)this; }
static Dbt* get_Dbt(DBT *dbt) { return (Dbt *)dbt; }
static const Dbt* get_const_Dbt(const DBT *dbt)
{ return (const Dbt *)dbt; }
Dbt(void *data, u_int32_t size);
Dbt();
~Dbt();
Dbt(const Dbt &);
Dbt &operator = (const Dbt &);
private:
// Note: no extra data appears in this class (other than
// inherited from DBT) since we need DBT and Dbt objects
// to have interchangable pointers.
//
// When subclassing this class, remember that callback
// methods like bt_compare, bt_prefix, dup_compare may
// internally manufacture DBT objects (which later are
// cast to Dbt), so such callbacks might receive objects
// not of your subclassed type.
};
////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
//
// multiple key/data/reco iterator classes
//
// DbMultipleIterator is a shared private base class for the three types
// of bulk-return Iterator; it should never be instantiated directly,
// but it handles the functionality shared by its subclasses.
class _exported DbMultipleIterator
{
public:
DbMultipleIterator(const Dbt &dbt);
protected:
u_int8_t *data_;
u_int32_t *p_;
};
class _exported DbMultipleKeyDataIterator : private DbMultipleIterator
{
public:
DbMultipleKeyDataIterator(const Dbt &dbt) : DbMultipleIterator(dbt) {}
bool next(Dbt &key, Dbt &data);
};
class _exported DbMultipleRecnoDataIterator : private DbMultipleIterator
{
public:
DbMultipleRecnoDataIterator(const Dbt &dbt) : DbMultipleIterator(dbt) {}
bool next(db_recno_t &recno, Dbt &data);
};
class _exported DbMultipleDataIterator : private DbMultipleIterator
{
public:
DbMultipleDataIterator(const Dbt &dbt) : DbMultipleIterator(dbt) {}
bool next(Dbt &data);
};
////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
//
// Exception classes
//
// Almost any error in the DB library throws a DbException.
// Every exception should be considered an abnormality
// (e.g. bug, misuse of DB, file system error).
//
class _exported DbException : public __DB_STD(exception)
{
public:
virtual ~DbException() throw();
DbException(int err);
DbException(const char *description);
DbException(const char *description, int err);
DbException(const char *prefix, const char *description, int err);
int get_errno() const;
virtual const char *what() const throw();
DbEnv *get_env() const;
void set_env(DbEnv *env);
DbException(const DbException &);
DbException &operator = (const DbException &);
private:
void describe(const char *prefix, const char *description);
char *what_;
int err_; // errno
DbEnv *env_;
};
//
// A specific sort of exception that occurs when
// an operation is aborted to resolve a deadlock.
//
class _exported DbDeadlockException : public DbException
{
public:
virtual ~DbDeadlockException() throw();
DbDeadlockException(const char *description);
DbDeadlockException(const DbDeadlockException &);
DbDeadlockException &operator = (const DbDeadlockException &);
};
//
// A specific sort of exception that occurs when
// a lock is not granted, e.g. by lock_get or lock_vec.
// Note that the Dbt is only live as long as the Dbt used
// in the offending call.
//
class _exported DbLockNotGrantedException : public DbException
{
public:
virtual ~DbLockNotGrantedException() throw();
DbLockNotGrantedException(const char *prefix, db_lockop_t op,
db_lockmode_t mode, const Dbt *obj, const DbLock lock, int index);
DbLockNotGrantedException(const char *description);
DbLockNotGrantedException(const DbLockNotGrantedException &);
DbLockNotGrantedException &operator =
(const DbLockNotGrantedException &);
db_lockop_t get_op() const;
db_lockmode_t get_mode() const;
const Dbt* get_obj() const;
DbLock *get_lock() const;
int get_index() const;
private:
db_lockop_t op_;
db_lockmode_t mode_;
const Dbt *obj_;
DbLock *lock_;
int index_;
};
//
// A specific sort of exception that occurs when
// user declared memory is insufficient in a Dbt.
//
class _exported DbMemoryException : public DbException
{
public:
virtual ~DbMemoryException() throw();
DbMemoryException(Dbt *dbt);
DbMemoryException(const char *prefix, Dbt *dbt);
DbMemoryException(const DbMemoryException &);
DbMemoryException &operator = (const DbMemoryException &);
Dbt *get_dbt() const;
private:
Dbt *dbt_;
};
//
// A specific sort of exception that occurs when
// recovery is required before continuing DB activity.
//
class _exported DbRunRecoveryException : public DbException
{
public:
virtual ~DbRunRecoveryException() throw();
DbRunRecoveryException(const char *description);
DbRunRecoveryException(const DbRunRecoveryException &);
DbRunRecoveryException &operator = (const DbRunRecoveryException &);
};
#endif /* !_DB_CXX_H_ */
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