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/*-
* Copyright (c) 2014-2019 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_ext_transaction_id --
* Return the session's transaction ID.
*/
uint64_t
__wt_ext_transaction_id(WT_EXTENSION_API *wt_api, WT_SESSION *wt_session)
{
WT_SESSION_IMPL *session;
(void)wt_api; /* Unused parameters */
session = (WT_SESSION_IMPL *)wt_session;
/* Ignore failures: the only case is running out of transaction IDs. */
WT_IGNORE_RET(__wt_txn_id_check(session));
return (session->txn.id);
}
/*
* __wt_ext_transaction_isolation_level --
* Return if the current transaction's isolation level.
*/
int
__wt_ext_transaction_isolation_level(
WT_EXTENSION_API *wt_api, WT_SESSION *wt_session)
{
WT_SESSION_IMPL *session;
WT_TXN *txn;
(void)wt_api; /* Unused parameters */
session = (WT_SESSION_IMPL *)wt_session;
txn = &session->txn;
if (txn->isolation == WT_ISO_READ_COMMITTED)
return (WT_TXN_ISO_READ_COMMITTED);
if (txn->isolation == WT_ISO_READ_UNCOMMITTED)
return (WT_TXN_ISO_READ_UNCOMMITTED);
return (WT_TXN_ISO_SNAPSHOT);
}
/*
* __wt_ext_transaction_notify --
* Request notification of transaction resolution.
*/
int
__wt_ext_transaction_notify(
WT_EXTENSION_API *wt_api, WT_SESSION *wt_session, WT_TXN_NOTIFY *notify)
{
WT_SESSION_IMPL *session;
WT_TXN *txn;
(void)wt_api; /* Unused parameters */
session = (WT_SESSION_IMPL *)wt_session;
txn = &session->txn;
/*
* XXX
* For now, a single slot for notifications: I'm not bothering with
* more than one because more than one data-source in a transaction
* doesn't work anyway.
*/
if (txn->notify == notify)
return (0);
if (txn->notify != NULL)
WT_RET_MSG(
session, WT_ERROR, "transaction notify already scheduled");
txn->notify = notify;
return (0);
}
/*
* __wt_ext_transaction_oldest --
* Return the oldest transaction ID not yet visible to a running
* transaction.
*/
uint64_t
__wt_ext_transaction_oldest(WT_EXTENSION_API *wt_api)
{
return (((WT_CONNECTION_IMPL *)wt_api->conn)->txn_global.oldest_id);
}
/*
* __wt_ext_transaction_visible --
* Return if the current transaction can see the given transaction ID.
*/
int
__wt_ext_transaction_visible(
WT_EXTENSION_API *wt_api, WT_SESSION *wt_session, uint64_t transaction_id)
{
(void)wt_api; /* Unused parameters */
return (__wt_txn_visible(
(WT_SESSION_IMPL *)wt_session, transaction_id, WT_TS_NONE));
}
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