base_meth.so

berkeley db 4.6.21的源码。berkeley db是一个简单的数据库管理系统

m4_comment([$Id: base_meth.so,v 1.3 2007/03/21 23:48:54 alanb Exp $])

m4_ref_title(m4_db Replication,
    Base replication API,, rep/mgr_meth, rep/comm)

m4_p([dnl
Applications which use the Base replication API use the following
m4_db methods.])

m4_tagbegin

m4_tag(m4_ref(rep_set_transport), [dnl
The m4_refT(rep_set_transport) configures the replication system's
communications infrastructure.])

m4_tag(m4_ref(rep_start), [dnl
The m4_refT(rep_start) configures (or reconfigures) an existing database
environment to be a replication master or client.])

m4_tag(m4_ref(rep_message), [dnl
The m4_refT(rep_message) is used to process incoming messages from other
environments in the replication group.  For clients, it is responsible
for accepting log records and updating the local databases based on
messages from the master.  For both the master and the clients, it is
responsible for handling administrative functions (for example, the
protocol for dealing with lost messages), and permitting new clients to
join an active replication group.  This method should only be called
after the environment has been configured as a replication master or
client via m4_ref(rep_start).])

m4_tag(m4_ref(rep_elect), [dnl
The m4_refT(rep_elect) causes the replication group to elect a new
master; it is called whenever contact with the master is lost and the
application wants the remaining sites to select a new master.])

m4_tag(m4_ref(dbenv_set_event_notify), [dnl
The m4_refT(dbenv_set_event_notify) is needed for applications to
discover important replication-related events, such as the result of
an election and appointment of a new master.])

m4_tag(m4_ref(rep_set_priority), [dnl
The m4_refT(rep_set_priority) configures the local site's priority for
the purpose of elections.])

m4_tag(m4_ref(rep_set_timeout), [dnl
Note that of all the various timeouts this method can set, only
m4_ref(DB_REP_ELECTION_TIMEOUT) is relevant for applications which use
the Base replication API.  The others are used only by Replication
Manager.])

m4_tag(m4_ref(rep_set_limit), [dnl
The m4_refT(rep_set_limit) imposes an upper bound on the amount of data
that will be sent in response to a single call to m4_ref(rep_message).
During client recovery, that is, when a replica site is trying to
synchronize with the master, clients may ask the master for a large
number of log records.  If it is going to harm an application for the
master message loop to remain busy for an extended period transmitting
records to the replica, then the application will want to use
m4_ref(rep_set_limit) to limit the amount of data the master will send
before relinquishing control and accepting other messages.])

m4_tagend

m4_p([dnl
In addition to the methods previously described, applications which use
the Base replication API may also call the following methods, as needed:
m4_ref(rep_stat), m4_ref(rep_sync), m4_ref(rep_set_config).])

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