WT_DATA_SOURCE Struct Reference

Applications can extend WiredTiger by providing new implementations of the WT_DATA_SOURCE class. More...

Public Attributes
int(*	create )(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *name, int exclusive, const char *config)
	Callback to create a new object.
int(*	drop )(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *name, const char *cfg[])
	Callback to drop an object.
int(*	open_cursor )(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *obj, WT_CURSOR *owner, const char *cfg[], WT_CURSOR **new_cursor)
	Callback to initialize a cursor.
int(*	rename )(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *oldname, const char *newname, const char *cfg[])
	Callback to rename an object.
int(*	truncate )(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *name, const char *cfg[])
	Callback to truncate an object.

Detailed Description

Applications can extend WiredTiger by providing new implementations of the WT_DATA_SOURCE class.

Each data source supports a different URI scheme for data sources to WT_SESSION::create, WT_SESSION::open_cursor and related methods.

Thread safety: WiredTiger may invoke methods on the WT_DATA_SOURCE interface from multiple threads concurrently. It is the responsibility of the implementation to protect any shared data.

Applications register their implementation with WiredTiger by calling WT_CONNECTION::add_data_source.

        static WT_DATA_SOURCE my_dsrc = {
                my_create,
                my_drop,
                my_open_cursor,
                my_rename,
                my_truncate
        };
        ret = conn->add_data_source(conn, "dsrc:", &my_dsrc, NULL);

Member Data Documentation

int(* WT_DATA_SOURCE::create)(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *name, int exclusive, const char *config)

Callback to create a new object.

static int
my_create(WT_DATA_SOURCE *dsrc, WT_SESSION *session,
    const char *name, int exclusive, const char *config)
{
        /* Unused parameters */
        (void)dsrc;
        (void)session;
        (void)name;
        (void)exclusive;
        (void)config;

        return (0);
}

int(* WT_DATA_SOURCE::drop)(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *name, const char *cfg[])

Callback to drop an object.

static int
my_drop(WT_DATA_SOURCE *dsrc, WT_SESSION *session,
    const char *name, const char *cfg[])
{
        /* Unused parameters */
        (void)dsrc;
        (void)session;
        (void)name;
        (void)cfg;

        return (0);
}

int(* WT_DATA_SOURCE::open_cursor)(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *obj, WT_CURSOR *owner, const char *cfg[], WT_CURSOR **new_cursor)

Callback to initialize a cursor.

static int
my_open_cursor(WT_DATA_SOURCE *dsrc, WT_SESSION *session,
    const char *obj, WT_CURSOR *owner, const char *cfg[],
    WT_CURSOR **new_cursor)
{
        /* Unused parameters */
        (void)dsrc;

        (void)session;
        (void)obj;
        (void)owner;
        (void)cfg;
        (void)new_cursor;

        return (0);
}

int(* WT_DATA_SOURCE::rename)(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *oldname, const char *newname, const char *cfg[])

Callback to rename an object.

static int
my_rename(WT_DATA_SOURCE *dsrc, WT_SESSION *session,
    const char *oldname, const char *newname, const char *cfg[])
{
        /* Unused parameters */
        (void)dsrc;
        (void)session;
        (void)oldname;
        (void)newname;
        (void)cfg;

        return (0);
}

int(* WT_DATA_SOURCE::truncate)(WT_DATA_SOURCE *dsrc, WT_SESSION *session, const char *name, const char *cfg[])

Callback to truncate an object.

static int
my_truncate(WT_DATA_SOURCE *dsrc, WT_SESSION *session,
    const char *name, const char *cfg[])
{
        /* Unused parameters */
        (void)dsrc;
        (void)session;
        (void)name;
        (void)cfg;

        return (0);
}