1DBD::Gofer::Transport::UBsaesre(C3o)ntributed Perl DocumDeBnDt:a:tGioofner::Transport::Base(3)
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NAME

6       DBD::Gofer::Transport::Base - base class for DBD::Gofer client
7       transports
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SYNOPSIS

10         my $remote_dsn = "..."
11         DBI->connect("dbi:Gofer:transport=...;url=...;timeout=...;retry_limit=...;dsn=$remote_dsn",...)
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13       or, enable by setting the DBI_AUTOPROXY environment variable:
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15         export DBI_AUTOPROXY='dbi:Gofer:transport=...;url=...'
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17       which will force all DBI connections to be made via that Gofer server.
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DESCRIPTION

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

23       Gofer transport attributes can be specified either in the attributes
24       parameter of the connect() method call, or in the DSN string. When used
25       in the DSN string, attribute names don't have the "go_" prefix.
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27   go_dsn
28       The full DBI DSN that the Gofer server should connect to on your
29       behalf.
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31       When used in the DSN it must be the last element in the DSN string.
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33   go_timeout
34       A time limit for sending a request and receiving a response. Some
35       drivers may implement sending and receiving as separate steps, in which
36       case (currently) the timeout applies to each separately.
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38       If a request needs to be resent then the timeout is restarted for each
39       sending of a request and receiving of a response.
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41   go_retry_limit
42       The maximum number of times an request may be retried. The default is
43       2.
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45   go_retry_hook
46       This subroutine reference is called, if defined, for each response
47       received where $response->err is true.
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49       The subroutine is pass three parameters: the request object, the
50       response object, and the transport object.
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52       If it returns an undefined value then the default retry behaviour is
53       used. See "RETRY ON ERROR" below.
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55       If it returns a defined but false value then the request is not resent.
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57       If it returns true value then the request is resent, so long as the
58       number of retries does not exceed "go_retry_limit".
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RETRY ON ERROR

61       The default retry on error behaviour is:
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63        - Retry if the error was due to DBI_GOFER_RANDOM. See L<DBI::Gofer::Execute>.
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65        - Retry if $request->is_idempotent returns true. See L<DBI::Gofer::Request>.
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67       A retry won't be allowed if the number of previous retries has reached
68       "go_retry_limit".
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TRACING

71       Tracing of gofer requests and responses can be enabled by setting the
72       "DBD_GOFER_TRACE" environment variable. A value of 1 gives a reasonably
73       compact summary of each request and response. A value of 2 or more
74       gives a detailed, and voluminous, dump.
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76       The trace is written using DBI->trace_msg() and so is written to the
77       default DBI trace output, which is usually STDERR.
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METHODS

80       This section is currently far from complete.
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82   response_retry_preference
83         $retry = $transport->response_retry_preference($request, $response);
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85       The response_retry_preference is called by DBD::Gofer when considering
86       if a request should be retried after an error.
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88       Returns true (would like to retry), false (must not retry), undef (no
89       preference).
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91       If a true value is returned in the form of a CODE ref then, if
92       DBD::Gofer does decide to retry the request, it calls the code ref
93       passing $retry_count, $retry_limit.  Can be used for logging and/or to
94       implement exponential backoff behaviour.  Currently the called code
95       must return using "return;" to allow for future extensions.
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AUTHOR

98       Tim Bunce, <http://www.tim.bunce.name>
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101       Copyright (c) 2007-2008, Tim Bunce, Ireland. All rights reserved.
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103       This module is free software; you can redistribute it and/or modify it
104       under the same terms as Perl itself. See perlartistic.
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SEE ALSO

107       DBD::Gofer, DBI::Gofer::Request, DBI::Gofer::Response,
108       DBI::Gofer::Execute.
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110       and some example transports:
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112       DBD::Gofer::Transport::stream
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114       DBD::Gofer::Transport::http
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116       DBI::Gofer::Transport::mod_perl
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120perl v5.32.0                      2020-07-28    DBD::Gofer::Transport::Base(3)
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