DbEnv::rep_process_message()

#include <db_cxx.h>
 
int
DbEnv::rep_process_message(Dbt *control, Dbt *rec, int envid, DbLsn *ret_lsnp)

The DbEnv::rep_process_message() method processes an incoming replication message sent by a member of the replication group to the local database environment.

The DbEnv::rep_process_message() method is not called by most replication applications. It should only be called by Base API applications implementing their own network transport layer, explicitly holding replication group elections and handling replication messages outside of the Replication Manager framework.

For implementation reasons, all incoming replication messages must be processed using the same DbEnv handle. It is not required that a single thread of control process all messages, only that all threads of control processing messages use the same handle.

Before calling this method, the enclosing database environment must already have been opened by calling the DbEnv::open() method and must already have been configured to send replication messages by calling the DbEnv::rep_set_transport() method.

The DbEnv::rep_process_message() method has additional return values:

Unless otherwise specified, the DbEnv::rep_process_message() method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

Parameters

control

The control parameter should reference a copy of the control parameter specified by Berkeley DB on the sending environment. See the DbEnv::rep_set_transport() method for more information.

envid

The envid parameter should contain the local identifier that corresponds to the environment that sent the message to be processed (see Replication environment IDs for more information).

rec

The rec parameter should reference a copy of the rec parameter specified by Berkeley DB on the sending environment. See the DbEnv::rep_set_transport() method for more information.

ret_lsnp

If DbEnv::rep_process_message() method returns DB_REP_NOTPERM then the ret_lsnp parameter will contain the log sequence number of this permanent log message that could not be written to disk. If DbEnv::rep_process_message() method returns DB_REP_ISPERM then the ret_lsnp parameter will contain largest log sequence number of the permanent records that are now written to disk as a result of processing this message. In all other cases the value of ret_lsnp is undefined.

Errors

The DbEnv::rep_process_message() method may fail and throw a DbException exception, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

EINVAL

If the database environment was not already configured to communicate with a replication group by a call to DbEnv::rep_set_transport(); if the database environment was not already opened; if this method is called from a Replication Manager application; or if an invalid flag value or parameter was specified.

Class

DbEnv

See Also

Replication and Related Methods