Workflow::Persister(3pm)

1Workflow::Persister(3)User Contributed Perl DocumentationWorkflow::Persister(3)
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NAME

6       Workflow::Persister - Base class for workflow persistence
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VERSION

9       This documentation describes version 1.51 of this package
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SYNOPSIS

12        # Associate a workflow with a persister
13        <workflow type="Ticket"
14                  persister="MainDatabase">
15        ...
16
17        # Declare a persister
18        <persister name="MainDatabase"
19                   class="Workflow::Persister::DBI"
20                   driver="MySQL"
21                   dsn="DBI:mysql:database=workflows"
22                   user="wf"
23                   password="mypass"/>
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25        # Declare a separate persister
26        <persister name="FileSystem"
27                   class="Workflow::Persister::File"
28                   path="/path/to/my/workflow"/>
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DESCRIPTION

31       This is the base class for persisting workflows. It does not implement
32       anything itself but actual implementations should subclass it to ensure
33       they fulfill the contract.
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35       The job of a persister is to create, update and fetch the workflow
36       object plus any data associated with the workflow. It also creates and
37       fetches workflow history records.
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SUBCLASSING

40   Methods
41       create_workflow( $workflow )
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43       Stub that warns that the method should be overwritten in the derived
44       Persister. Since this is a SUPER class.
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46       Generate an ID for the workflow, serialize the workflow data (ID and
47       state) and set the ID in the workflow.
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49       Returns the ID for the workflow.
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51       update_workflow( $workflow )
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53       Stub that warns that the method should be overwritten in the derived
54       Persister. Since this is a SUPER class.
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56       Update the workflow state.
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58       Returns nothing.
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60       fetch_workflow( $workflow_id )
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62       Stub that warns that the method should be overwritten in the derived
63       Persister. Since this is a SUPER class.
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65       Retrieve the workflow data corresponding to $workflow_id. It not found
66       return undef, if found return a hashref with at least the keys "state"
67       and "last_update" (a DateTime instance).
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69       create_history( $workflow, @history )
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71       Stub that warns that the method should be overwritten in the derived
72       Persister. Since this is a SUPER class.
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74       Serialize all objects in @history for later retrieval.
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76       Returns @history, the list of history objects, with the history "id"
77       and "saved" values set according to the saved results.
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79       fetch_history( $workflow )
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81       Stub that warns that the method should be overwritten in the derived
82       Persister. Since this is a SUPER class.
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84       The derived class method should return a list of Workflow::History
85       objects.
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87       get_create_user( $workflow )
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89       When creating an initial Workflow::History record to insert into the
90       database, the return value of this method is used for the value of the
91       "user" field.
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93       Override this method to change the value from the default, "n/a".
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95       get_create_description( $workflow )
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97       When creating an initial Workflow::History record to insert into the
98       database, the return value of this method is used for the value of the
99       "description" field.
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101       Override this method to change the value from the default, "Create new
102       workflow".
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104       get_create_action( $workflow )
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106       When creating an initial Workflow::History record to insert into the
107       database, the return value of this method is used for the value of the
108       "action" field.
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110       Override this method to change the value from the default, "Create
111       workflow".
112
113       assign_generators( \%params )
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115       Assigns proper generators based on intialization, see "init"
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117       fetch_extra_workflow_data ( $workflow )
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119       A stub that warns that the method should be overwritten in the derived
120       Persister. Since this is a SUPER class.
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122       commit_transaction
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124       Commit the current transaction if the persister supports transactions.
125       This stub does not have to be overridden. It is not executed if
126       autocommit is on.
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128       rollback_transaction
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130       Roll back the current transaction if the persister supports
131       transactions.  This stub does not have to be overridden. It is not
132       executed if autocommit is on.
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134       init
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136       Method to initialize persister based on configuration.
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138       init_random_generators( \%params )
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140       Initializes random id generators, takes the following named parameters:
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142       •   length, of random id to be generated
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144       Returns two identical random id generator objects in list context.
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146       init_uuid_generators( \%params )
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148       Initializes UUID generators, takes no parameters
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150       Returns two identical UUID generator objects in list context.
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TODO

153       •   refactor init_random_generators, returns two similar objects?
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155       •   refactor init_uuid_generators, returns two similar objects?
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157       •   refactor init_uuid_generators, takes no parameters, even though we
158           shift parameters in?
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COPYRIGHT

166       Copyright (c) 2003-2021 Chris Winters. All rights reserved.
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168       This library is free software; you can redistribute it and/or modify it
169       under the same terms as Perl itself.
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171       Please see the LICENSE
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AUTHORS

174       Please see Workflow
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178perl v5.32.1                      2021-01-31            Workflow::Persister(3)