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DBD::Gofer::Transport:UsereContributed Perl DocuDBD::Gofer::Transport::Base(3)

NAME
       DBD::Gofer::Transport::Base - base class for DBD::Gofer client
       transports

SYNOPSIS
         my $remote_dsn = "..."
         DBI->connect("dbi:Gofer:transport=...;url=...;timeout=...;retry_limit=...;dsn=$remote_dsn",...)

       or, enable by setting the DBI_AUTOPROXY environment variable:

         export DBI_AUTOPROXY='dbi:Gofer:transport=...;url=...'

       which will force all DBI connections to be made via that Gofer server.

DESCRIPTION
       This is the base class for all DBD::Gofer client transports.

ATTRIBUTES
       Gofer transport attributes can be specified either in the attributes
       parameter of the connect() method call, or in the DSN string. When used
       in the DSN string, attribute names don't have the "go_" prefix.

   go_dsn
       The full DBI DSN that the Gofer server should connect to on your
       behalf.

       When used in the DSN it must be the last element in the DSN string.

   go_timeout
       A time limit for sending a request and receiving a response. Some
       drivers may implement sending and receiving as separate steps, in which
       case (currently) the timeout applies to each separately.

       If a request needs to be resent then the timeout is restarted for each
       sending of a request and receiving of a response.

   go_retry_limit
       The maximum number of times an request may be retried. The default is
       2.

   go_retry_hook
       This subroutine reference is called, if defined, for each response
       received where $response->err is true.

       The subroutine is pass three parameters: the request object, the
       response object, and the transport object.

       If it returns an undefined value then the default retry behaviour is
       used. See "RETRY ON ERROR" below.

       If it returns a defined but false value then the request is not resent.

       If it returns true value then the request is resent, so long as the
       number of retries does not exceed "go_retry_limit".

RETRY ON ERROR
       The default retry on error behaviour is:

        - Retry if the error was due to DBI_GOFER_RANDOM. See L<DBI::Gofer::Execute>.

        - Retry if $request->is_idempotent returns true. See L<DBI::Gofer::Request>.

       A retry won't be allowed if the number of previous retries has reached
       "go_retry_limit".

TRACING
       Tracing of gofer requests and reponses can be enabled by setting the
       "DBD_GOFER_TRACE" environment variable. A value of 1 gives a reasonably
       compact summary of each request and response. A value of 2 or more
       gives a detailed, and voluminous, dump.

       The trace is written using DBI->trace_msg() and so is written to the
       default DBI trace output, which is usually STDERR.

METHODS
       This section is currently far from complete.

   response_retry_preference
         $retry = $transport->response_retry_preference($request, $response);

       The response_retry_preference is called by DBD::Gofer when considering
       if a request should be retried after an error.

       Returns true (would like to retry), false (must not retry), undef (no
       preference).

       If a true value is returned in the form of a CODE ref then, if
       DBD::Gofer does decide to retry the request, it calls the code ref
       passing $retry_count, $retry_limit.  Can be used for logging and/or to
       implement exponential backoff behaviour.  Currently the called code
       must return using "return;" to allow for future extensions.

AUTHOR
       Tim Bunce, <http://www.tim.bunce.name>

LICENCE AND COPYRIGHT
       Copyright (c) 2007-2008, Tim Bunce, Ireland. All rights reserved.

       This module is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself. See perlartistic.

SEE ALSO
       DBD::Gofer, DBI::Gofer::Request, DBI::Gofer::Response,
       DBI::Gofer::Execute.

       and some example transports:

       DBD::Gofer::Transport::stream

       DBD::Gofer::Transport::http

       DBI::Gofer::Transport::mod_perl

perl v5.12.1                      2009-02-24    DBD::Gofer::Transport::Base(3)
 

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Gedruckt am: 19.10.2017 04:02 GMT+0200 (2017-10-19T04:02:42+02:00)