MongoDB C++ Driver mongocxx-3.11.0
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mongocxx::v_noabi::client_session Class Reference

#include <mongocxx/v_noabi/mongocxx/client_session.hpp>

Description

Use a session for a sequence of operations, optionally with either causal consistency or snapshots.

Note that client_session is not thread-safe. See https://www.mongodb.com/docs/languages/cpp/cpp-driver/current/thread-safety/ for more details.

See also

Public Types

using with_transaction_cb = std::function<void MONGOCXX_ABI_CDECL(client_session*)>
 Represents a callback invoked within a transaction.
 

Public Member Functions

 client_session (client_session &&) noexcept
 Move constructs a session.
 
 ~client_session () noexcept
 Ends and destroys the session.
 
void abort_transaction ()
 Aborts a transaction on the current client session.
 
void advance_cluster_time (const bsoncxx::v_noabi::document::view &cluster_time)
 Advance the cluster time for a session. Has an effect only if the new cluster time is greater than the session's current cluster time.
 
void advance_operation_time (const bsoncxx::v_noabi::types::b_timestamp &operation_time)
 Advance the session's operation time, expressed as a BSON timestamp. Has an effect only if the new operation time is greater than the session's current operation time.
 
const mongocxx::v_noabi::clientclient () const noexcept
 Gets the client that started this session.
 
bsoncxx::v_noabi::document::view cluster_time () const noexcept
 Get the session's clusterTime, as a BSON document. This is an opaque value suitable for passing to advance_cluster_time(). The document is empty if the session has not been used for any operation and you have not called advance_cluster_time(). This view is invalid after the session is destroyed.
 
void commit_transaction ()
 Commits a transaction on the current client session.
 
bool get_dirty () const noexcept
 Returns whether or not this session is dirty.
 
transaction_state get_transaction_state () const noexcept
 Returns the current transaction state for this session.
 
bsoncxx::v_noabi::document::view id () const noexcept
 Get the server-side "logical session ID" associated with this session, as a BSON document. This view is invalid after the session is destroyed.
 
bsoncxx::v_noabi::types::b_timestamp operation_time () const noexcept
 Get the session's operationTime, as a BSON timestamp. This is an opaque value suitable for passing to advance_operation_time(). The timestamp is zero if the session has not been used for any operation and you have not called advance_operation_time().
 
client_sessionoperator= (client_session &&) noexcept
 Move assigns a session.
 
const options::client_sessionoptions () const noexcept
 Gets the options this session was created with.
 
std::uint32_t server_id () const noexcept
 Get the server_id the session is pinned to. The server_id is zero if the session is not pinned to a server.
 
void start_transaction (const stdx::optional< options::transaction > &transaction_opts={})
 Starts a transaction on the current client session.
 
void with_transaction (with_transaction_cb cb, options::transaction opts={})
 Helper to run a user-provided callback within a transaction.
 

Member Typedef Documentation

◆ with_transaction_cb

Represents a callback invoked within a transaction.

Constructor & Destructor Documentation

◆ client_session()

mongocxx::v_noabi::client_session::client_session ( client_session && )
noexcept

Move constructs a session.

◆ ~client_session()

mongocxx::v_noabi::client_session::~client_session ( )
noexcept

Ends and destroys the session.

Member Function Documentation

◆ abort_transaction()

void mongocxx::v_noabi::client_session::abort_transaction ( )

Aborts a transaction on the current client session.

Exceptions
mongocxx::v_noabi::operation_exceptionif the options are misconfigured or if there are other errors such as a session with no transaction in progress.

◆ advance_cluster_time()

void mongocxx::v_noabi::client_session::advance_cluster_time ( const bsoncxx::v_noabi::document::view & cluster_time)

Advance the cluster time for a session. Has an effect only if the new cluster time is greater than the session's current cluster time.

Use advance_operation_time() and advance_cluster_time() to copy the operationTime and clusterTime from another session, ensuring subsequent operations in this session are causally consistent with the last operation in the other session.

◆ advance_operation_time()

void mongocxx::v_noabi::client_session::advance_operation_time ( const bsoncxx::v_noabi::types::b_timestamp & operation_time)

Advance the session's operation time, expressed as a BSON timestamp. Has an effect only if the new operation time is greater than the session's current operation time.

Use advance_operation_time() and advance_cluster_time() to copy the operationTime and clusterTime from another session, ensuring subsequent operations in this session are causally consistent with the last operation in the other session.

◆ client()

const mongocxx::v_noabi::client & mongocxx::v_noabi::client_session::client ( ) const
noexcept

Gets the client that started this session.

◆ cluster_time()

bsoncxx::v_noabi::document::view mongocxx::v_noabi::client_session::cluster_time ( ) const
noexcept

Get the session's clusterTime, as a BSON document. This is an opaque value suitable for passing to advance_cluster_time(). The document is empty if the session has not been used for any operation and you have not called advance_cluster_time(). This view is invalid after the session is destroyed.

◆ commit_transaction()

void mongocxx::v_noabi::client_session::commit_transaction ( )

Commits a transaction on the current client session.

Exceptions
mongocxx::v_noabi::operation_exceptionif the options are misconfigured, if there are network or other transient failures, or if there are other errors such as a session with no transaction in progress.

◆ get_dirty()

bool mongocxx::v_noabi::client_session::get_dirty ( ) const
noexcept

Returns whether or not this session is dirty.

◆ get_transaction_state()

transaction_state mongocxx::v_noabi::client_session::get_transaction_state ( ) const
noexcept

Returns the current transaction state for this session.

◆ id()

bsoncxx::v_noabi::document::view mongocxx::v_noabi::client_session::id ( ) const
noexcept

Get the server-side "logical session ID" associated with this session, as a BSON document. This view is invalid after the session is destroyed.

◆ operation_time()

bsoncxx::v_noabi::types::b_timestamp mongocxx::v_noabi::client_session::operation_time ( ) const
noexcept

Get the session's operationTime, as a BSON timestamp. This is an opaque value suitable for passing to advance_operation_time(). The timestamp is zero if the session has not been used for any operation and you have not called advance_operation_time().

◆ operator=()

client_session & mongocxx::v_noabi::client_session::operator= ( client_session && )
noexcept

Move assigns a session.

◆ options()

const options::client_session & mongocxx::v_noabi::client_session::options ( ) const
noexcept

Gets the options this session was created with.

◆ server_id()

std::uint32_t mongocxx::v_noabi::client_session::server_id ( ) const
noexcept

Get the server_id the session is pinned to. The server_id is zero if the session is not pinned to a server.

◆ start_transaction()

void mongocxx::v_noabi::client_session::start_transaction ( const stdx::optional< options::transaction > & transaction_opts = {})

Starts a transaction on the current client session.

Parameters
transaction_opts(optional) The options to use in the transaction.
Exceptions
mongocxx::v_noabi::operation_exceptionif the options are misconfigured, if there are network or other transient failures, or if there are other errors such as a session with a transaction already in progress.

◆ with_transaction()

void mongocxx::v_noabi::client_session::with_transaction ( with_transaction_cb cb,
options::transaction opts = {} )

Helper to run a user-provided callback within a transaction.

This method will start a new transaction on this client session, run the callback, then commit the transaction. If it cannot commit the transaction, the entire sequence may be retried, and the callback may be run multiple times.

If the user callback calls driver methods that run operations against the server that can throw an operation_exception (ex: collection::insert_one), the user callback should allow those exceptions to propagate up the stack so they can be caught and processed by the with_transaction helper.

Parameters
cbThe callback to run inside of a transaction.
opts(optional) The options to use to run the transaction.
Exceptions
mongocxx::v_noabi::operation_exceptionif there are errors completing the transaction.

The documentation for this class was generated from the following file: