Difference between revisions of "API:EPrints/DataObj/EventQueue"

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==NAME==
 
==NAME==
'''EPrints::DataObj::EventQueue''' - scheduler/indexer event queue
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'''EPrints::DataObj::EventQueue''' - Scheduler/indexer event queue.
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==DESCRIPTION==
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Individual tasks for the EPrints event queue that can then be actioned by the EPrints indexer in the background.
  
 
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==METHODS==
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==INSTANCE VARIABLES==
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See [[API:EPrints/DataObj#INSTANCE_VARIABLES|EPrints::DataObj]].
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===get_system_field_info===
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==METHODS==
 
 
$metadata = EPrints::DataObj::EPrint-&gt;get_system_field_info
 
Return an array describing the system metadata of the event queue  dataset.
 
 
 
 
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===get_dataset_id===
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===Constructor Methods===
 
 
$dataset = EPrints::DataObj::EPrint-&gt;get_dataset_id
 
Returns the ID of the [[API:EPrints/DataSet|EPrints::DataSet]] object to which this record belongs.
 
 
 
 
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===create_unique===
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====create_unique====
  
 
  $event = EPrints::DataObj::EventQueue-&gt;create_unique( $session, $data, [ $dataset ] )
 
  $event = EPrints::DataObj::EventQueue-&gt;create_unique( $session, $data, [ $dataset ] )
Returns a unique event queue task using the <tt>$data</tt> provided. Setting the <tt>eventqueueid</tt> to a MD5 hash of the <tt>pluginid</tt>, <tt>action</tt> and (if given) <tt>params</tt>.
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Returns a unique event queue task using the <tt>$data</tt> provided. Setting the <tt>eventqueueid</tt> to a MD5 hash of the <tt>pluginid</tt>, <tt>action</tt> and (if given) <tt>params</tt>.
  
 
Returns <tt>undef</tt> if such an event already exists.
 
Returns <tt>undef</tt> if such an event already exists.
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===new_from_hash===
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====new_from_hash====
  
 
  $event = EPrints::DataObj::EventQueue-&gt;new_from_hash( $session, $data, [ $dataset ] )
 
  $event = EPrints::DataObj::EventQueue-&gt;new_from_hash( $session, $data, [ $dataset ] )
Returns the event that corresponds to the MD5 hash of the <tt>$data</tt> provided, (<tt>pluginid</tt>, <tt>action</tt> and <tt>params</tt>).  Returns <tt>undef</tt> if no event queue task exists with a matching MD5 hash.
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Returns the event that corresponds to the MD5 hash of the <tt>$data</tt> provided, (<tt>pluginid</tt>, <tt>action</tt> and <tt>params</tt>).  Returns <tt>undef</tt> if no event queue task exists with a matching MD5 hash.
  
 
If <tt>$dataset</tt> is not provided generate from dataset ID of the class.
 
If <tt>$dataset</tt> is not provided generate from dataset ID of the class.
  
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===Class Methods===
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====get_system_field_info====
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$metadata = EPrints::DataObj::EPrint-&gt;get_system_field_info
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Returns an array describing the system metadata of the event queue  dataset.
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====get_dataset_id====
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$dataset = EPrints::DataObj::EPrint-&gt;get_dataset_id
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Returns the ID of the [[API:EPrints/DataSet|EPrints::DataSet]] object to which this record belongs.
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===Object Methods===
 
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===execute===
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====execute====
  
 
  $ok = $event-&gt;execute()
 
  $ok = $event-&gt;execute()
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===message===
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====message====
  
 
  $event-&gt;message( $type, $message )
 
  $event-&gt;message( $type, $message )
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<tt>$type</tt> is required by this method but not currently used.
 
<tt>$type</tt> is required by this method but not currently used.
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==SEE ALSO==
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[[API:EPrints/DataObj|EPrints::DataObj]] and [[API:EPrints/DataSet|EPrints::DataSet]].
  
 
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Latest revision as of 16:51, 10 January 2022

EPrints 3 Reference: Directory Structure - Metadata Fields - Repository Configuration - XML Config Files - XML Export Format - EPrints data structure - Core API - Data Objects


API: Core API

Latest Source Code (3.4, 3.3) | Revision Log | Before editing this page please read Pod2Wiki


NAME

EPrints::DataObj::EventQueue - Scheduler/indexer event queue.

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DESCRIPTION

Individual tasks for the EPrints event queue that can then be actioned by the EPrints indexer in the background.

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CORE METADATA FIELDS

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eventqueueid (uuid)

Either a UUID or a hash of the event (if created with create_unique).

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cleanup (boolean)

If set to true removes this event once it has finished. Defaults to true.

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priority (int)

The priority for this event.

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start_time (time)

The event should not be executed before this time.

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end_time (time)

The event was last touched at this time.

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status (set)

The status of this event. Can be waiting, inprogress, success or failed. Defaults to failed.

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description (longtext)

A human-readable description of this event (or error).

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pluginid (id)

The EPrints::Plugin::Event plugin id to call to execute this event.

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action (id)

The name of the action to execute on the plugin (i.e. method name).

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params (storable)

Parameters to pass to the action (a text serialisation).

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REFERENCES AND RELATED OBJECTS

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userid (itemref)

The user (if any) that was responsible for creating this event.

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INSTANCE VARIABLES

See EPrints::DataObj.

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METHODS

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Constructor Methods

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create_unique

$event = EPrints::DataObj::EventQueue->create_unique( $session, $data, [ $dataset ] )

Returns a unique event queue task using the $data provided. Setting the eventqueueid to a MD5 hash of the pluginid, action and (if given) params.

Returns undef if such an event already exists.

If $dataset is not provided generate from dataset ID of the class.

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new_from_hash

$event = EPrints::DataObj::EventQueue->new_from_hash( $session, $data, [ $dataset ] )

Returns the event that corresponds to the MD5 hash of the $data provided, (pluginid, action and params). Returns undef if no event queue task exists with a matching MD5 hash.

If $dataset is not provided generate from dataset ID of the class.

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Class Methods

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get_system_field_info

$metadata = EPrints::DataObj::EPrint->get_system_field_info

Returns an array describing the system metadata of the event queue dataset.

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get_dataset_id

$dataset = EPrints::DataObj::EPrint->get_dataset_id

Returns the ID of the EPrints::DataSet object to which this record belongs.

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Object Methods

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execute

$ok = $event->execute()

Execute the action this event queue task describes.

The response from the EPrints::Plugin::Event plugin action is treated as follows:

undef - equivalent to HTTP_OK
HTTP_OK - action succeeded, event is removed if cleanup is TRUE
HTTP_RESET_CONTENT - action succeeded, event is set 'waiting'
HTTP_NOT_FOUND - action failed, event is removed if cleanup is TRUE
HTTP_LOCKED - action failed, event is re-scheduled for 10 minutes time
HTTP_INTERNAL_SERVER_ERROR - action failed, event is 'failed' and kept
 

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message

$event->message( $type, $message )

Utility method to log the $message for this event.

$type is required by this method but not currently used.

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SEE ALSO

EPrints::DataObj and EPrints::DataSet.

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COPYRIGHT

© Copyright 2022 University of Southampton.

EPrints 3.4 is supplied by EPrints Services.

http://www.eprints.org/eprints-3.4/

LICENSE

This file is part of EPrints 3.4 http://www.eprints.org/.

EPrints 3.4 and this file are released under the terms of the GNU Lesser General Public License version 3 as published by the Free Software Foundation unless otherwise stated.

EPrints 3.4 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with EPrints 3.4. If not, see http://www.gnu.org/licenses/.

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