Setting up event-action configurations
Before setting up Event Actions, first read more about the LogEventProcessor component of the Master Controller.
The live forecasting system can be scheduled to run workflows as a consequence of a log event generated by the system. This facility is used to enhance forecasting, or to export current forecast data on a new forecast becoming available. This can only be done by suitably authorised users, and should follow a carefully defined scheduling plan. These users must have access to the admin interface tool (see Admin Interface manual).
The actions that can be defined are;
- Resuming a suspended task
- Suspending a task
- Changing of scheduling interval of a task (and resuming the task if required)
- Submitting a single run of a task
For each an appropriate action configuration must be defined. A task that is to be enhanced, changed or a oneoff task that is to be submitted must have already been scheduled to the Master Controller and available in the Scheduled Tasks Lists as a suspended scheduled task. The run is identified by its tag available in that list.
The procedure in defining an action config is.
- Open the Admin interface.
- Select the Workflow and FSS's item
- Select Event and Action Configuration .
- Select Upload New Action Configuration . This is an XML file that describes the action to be taken. It includes the tag that is defined in the Scheduled Forecast list. This must be identical (case sensitive) for a match to be made. Examples for the four types of actions are given below.
- Submit the Action Config.
- Select Event Action Mappings item
- Select Create New Action Event Mapping
- Enter the Event Code and select the Action Configuration Id for the configuration just created.
- Select submit.
NOTE: when deleting action configurations, the EventAction Mapping must be deleted first due to relations in the database.
Example of Action Config to resume a suspended task
Example of Action Config to suspend a task
Example of Action Config to enhance a task
Example of Action Config to run one instance of a task
Note1: a one off task requires a cardinal time step and a reference time to establish a correct T0 for the run. The new T0 will be the latest valid T0 for the specified cardinal time step. Suppose a task is triggered at 11:59 GMT with a 3 hour cardinal time-step from midnight, T0 will become 09:00 GMT, when triggered at 12:00 GMT, T0 will become 12:00 GMT. The cardinal time step is important as it also controls how often the master controller will run an instance of the task if triggered by an event. It will only run once every cardinal timestep, even though there are multiple events in that period.
Note2: For 2017.01 and earlier it is recommended to use taskTags and workflowIds that are uniquely identifiable by their first 23 characters since those parts of the taskTag and workflowId are used for checking whether a task has already been triggered for a specific T0. When taskTag + workflowId exceed 46 characters the taskTag will be shortened to the first 23 characters and if it then still exceeds 46 characters the workflowId will also be shortened to the first 23 characters. From FEWS version 2017.02 the shortening is removed, both workflowId and taskTag can be 64 characters long.
Note3: It is recommended to set the interval to 1 second if the action should be executed for every event code (e.g. in the case of sending alert messages), but should be increased if it is not desirable to execute several workflows in a short period (e.g. the case of creating web reports). It also needs the "template task" with the relevant tag scheduled (in suspended mode) as a single/one-off task.
Uploading multiple action configurations
You can upload any number of action configurations in one file if you click on "Upload multiple configurations" button. This feature is available since 2019.02. If you click the checkbox "Default", all uploaded configurations will be set as default. If there are no configurations in the database that share an action ID with the new uploaded configuration, it will be set to default automatically. If the set default checkbox is not checked, the new configurations will appear in the lists of versions under the same action id.
Example for multiple upload:
You can download all active (default) configurations in this same format by clicking download. The single action configuration format is available for download from the list of versions under the same action id.
Example of a scheduled (and suspended) task in the Admin Interface
Dual MC with failover mode triggers suspended tasks with runOnFailOver from remote MC
Since 2015.01 suspended one-off tasks can be triggered by failover (both manual and automatic failover).
For instance when the duty master-controller has a suspended one-off task prepared which is available via MC-Synchronisation at the other MC, then the second MC can trigger the duty Mc's task when a similar event-action mapping is available in the second MC.
E.g. MC00 is the duty MC and MC01 the backup. On both MCs there are frequently running import tasks both generating TASKRUN:Complete.ImportExternal. There is an event-action mapping on both MCs from TASKRUN:Complete.ImportExternal to the tag big_calculation. One suspended one-off task BigCalculation with the tag big_calculation has been prepared at the MC00 with the runOnFailOver option active. For MC01 no such task is prepared.
1. When MC00 is running fine, only MC00 triggers the BigCalculation task, MC01 logs that an event is processed but will not find a task to process.
2. MC00 is put in manual failover -> both MC00 and MC01 trigger BigCalculation task.
3. MC00 is restored from manual failover -> only MC00 triggers BigCalculation task.
4. MC00 is brought down -> only MC01 triggers BigCalculation task.
5. MC00 is restarted -> only MC00 triggers BigCalculation task.
6. MC00 is brought down by shutting down all its FSSs -> only MC01 triggers BigCalculation task.
7. all MC00 FSSs are restarted-> only MC00 triggers BigCalculation task.
Multiple event actions with the same task
In order to suspend or resume a task using event actions, it is possible to specify multiple event action mappings.
1. ensure the task has a tasktag
2. provide multiple event action configurations matching one and the same tasktag, e.g. one to suspend a task, one to resume a task.
3. map different event codes to the different event actions.
Related information on Event-codes
See also event-codes for an overview of the event-codes which also contains a brief list of the most commonly used event codes.