When using replication backends, now the role of a connection is not
defined by its alias but by the new connection parameter "role" that
can be set to "master", "slave" and (for redis-sentinel) "sentinel".
This also led to a redesign of how connections can be retrieved from
replication backends: the method getConnectionById() now retrieves a
connection only by its ID (ip:port pair), to get a connection by its
alias there is the new method getConnectionByAlias(). This method is
not supported by the redis-sentinel backend due to its dynamic nature
(connections are retrieved and initialized at runtime from sentinels)
but it is still possible to get a single connection from the pool by
using its ID. It is also possible to retrive a connection by its role
using the method getConnectionByRole().
NOTE: the "role" parameter is an hint for the internals of aggregate
connection backends so it is still possible that the actual role of
a connection changes during the execution of a script (e.g. a slave
gets promoted to the role of master): in this case the parameters of
that connection will not be changed as they are immutable, but the
method getConnectionByRole() will return the appropriate connection.
Predis\Client::getClientBy() has been updated with the addition of
"role" and "alias" as supported selectors.
All option classes have been moved in the Predis\Configuration\Option
namespace and some have been optimized to have less impact on client
initialization timings.
Furthermore the accepted values for some options have been changed,
this is the complete list of accepted values:
- _aggregate_: callable returning an aggregate connection.
- cluster: string value ("predis", "redis"), callable returning an
aggregate connection.
- replication: string value ("predis", "sentinel"), callable returning
an aggregate connection.
- commands: command factory, named array mapping command IDs to PHP
classes, callable returning a command factory or a named array.
- connections: connection factory, callable returning a connection
factory, named array mapping connection schemes to PHP classes.
- _prefix_: string value, command processor, callable.
- _exceptions_: boolean value.
Note that the cluster and replication options now return a closure
acting as initializer instead of an aggregate connection.
Daniele Alessandri