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Tasks scheduler

The task can be scheduled in three different ways - types of triggers:

  • Settled time - will enter a settled launching time If the time was entered in the past, then the task is launched right away.
  • Dependent task - trigger task, when other task successfully ended. Dependent tasks are executed by LongRunningTaskExecuteDependentProcessor.

To run, schedule and review tasks, interfaces have been created:

  • LongRunningTaskExecutor - any executable task. This task can be run from the code.
  • SchedulableTaskExecutor - scheduled task. The task can be scheduled through UI schedulers.
  • AbstractSchedulableStatefulExecutor - stateful scheduled task. Result is logged for every processed item (see next section).

The descendants of these interfaces can be transmitted to the service LongRunningTaskManager to be run. This is how the records related to them needed for their future management in the database IdmLongRunningTask will be created. If the task fails or it is interrupted, again a record in the database is made. On the records of the running / finished tasks, an agenda on front-end has been created where it is possible to see the course of the task and cancel the tasks as needed.

To schedule the task, the Quartz Scheduler has been integrated through the service SchedulerManager. The service will automatically find all the tasks implementing SchedulableTaskExecutor and offers them for scheduling in UI. The task parameters can be specified in the getParameterNames() method, these parameters being passed before running through the init(Map<String, Object> properties) method - there are string values falling through the UI so it depends on the task how it will accept the parameters (the prepared ParameterConverter can be used).

Every task has a defined instance (server) where it should be run. From one instance, it is possible to schedule tasks on more instances (one front-end for more back-ends over one database). The task running on the selected instance is ensured by the service LongRunningTaskManager which controls actively the tasks to be run prepared by the scheduler (through the database). The instance identifier is defined in application configuration. To run the instance, the tasks which are marked as running in the previous launching of the instance in question are checked, and they are marked as finished (they couldn´t finish).

When task type is removed (e.g. between module versions), then all scheduled task from this obsolete type are removed automatically - task type doesn't exist anymore, so cannot be scheduled.

Configured scheduled task is persisted with selected SchedulableTaskExecutor implementation class ⇒ when executor implementation is renamed or moved into different package, then scheduled task with modified executor has to be reconfigured too (tasks are stored in quartz storage).

When tasks has to run exclusively, annotation @DisallowConcurrentExecution can be used. Task with one type (class) and with this annotation will be not be executed, if the same task with type (class) is running. Task is not canceled - he will be executed after previous task will end (respectively, when prepared task will be executed from queue again - see above). When task type is not sufficient for choosing, when to not run concurrently, then AbstractSchedulableStatefulExecutor#validatemethod can be overriden.

Cron in profile DEV

Tasks started by CRON in maven profile DEV was started only once for 3600000ms. This configuration is set by property: scheduler.task.queue.process in application-dev.properties. Server restart is needed! This property can not be overloaded by FE configuration agenda.

Configuration QUARTZ (datasource, etc.)

Configuration of QUARTZ (scheduler) it is using application properties by individual profiles. In every profile application properties is necessary set path for queart's settings (his own application properties) - scheduler.properties.location. Change property scheduler.task.queue.process needed server restart! This property can not be overloaded by FE configuration agenda.

Example

Example of an implementing task - you will find everything that has been mentioned here.

Stateful task executors are an extension of standard long running task executor, which hold a state and processed items log. Such functionality is suitable for tasks, which has to keep historical records of processed items.

The key concepts of stateful executors are queue and log. The queue is a set of records that have been processed, but the information about them is required for next run of the task. Take contract enable task as an example. Once a contract is valid, the task should process it. But it must be processed only once, not every time the task is run and the contract is valid. Therefore until the contract is valid, it is kept in the queue and will not be processed again. The log is a mechanism to keep track of what kind of items were processed by the task and what was the processing result.

Stateful tasks are tightly coupled with Quartz' scheduled tasks, that is the tasks that are run multiple times. Running a stateful task from code as a simple LongRunningExecutor is pointless, because there is no reason to keep neither history nor processed items queue. The relation to Quartz is realized through IdmScheduledTask entity, which holds Quartz job's unique job key. The task queue then references the IdmScheduledTask. Original IdmLongRunningTask entity is the owner of the log items. Log items are related to each task run, which is done by the mentioned entity.

All stateful tasks shall implement the SchedulableStatefulExecutor. Its abstract implementation AbstractSchedulableStatefulExecutor, which can be viewed as a template method for task execution, hold most of the common logic. The intent is to always extend the AbstractSchedulableStatefulExecutor and define the getItemsToProcess and processItem method by concrete task. Therefore the developer should mostly focus only on retrieving items and the business logic, which does the processing.

The item processing result is represented by OperationResult. Successful operations are inserted both into the queue and log, all results go to the log.

After the item processing finishes, the queue is refreshed. The algorithm is simple, as it only removes all items from queue, which were not processed in current run.

AbstractSchedulableStatefulExecutor methods (to implement / overridable):

  • getItemsToProcess - required. Returns item to be processed by this LRT.
  • processItem - required. Business logic - processing single item.
  • supportsDryRun - true by default. If task could be executed in Dry run mode = ~test run. Task executed in this mode only iterates through items to process and log them ⇒ processItem is not executed.
  • continueOnException - false by default. LRT will continue, after some item fails.
  • requireNewTransaction false by default. Each item will be processed in new transaction - ensures successfully processed item will be commited after other item or LRT task fails. Use this property everywhere, when LRT can be executed synchronously (e.g. for synchronization dependent task, which are executed synchronously and wrapped which one parent transaction).
Look out: when scheduled task is removed, then all item will be processed again! Processed items are linked to scheduled task instance. Prevent to remove tasks, which sends notifications etc. (e.g. passwor exrire warning) - notifications will be send again.

Implemented long running task are listed bellow. Non schedulable long running tasks are included.

PasswordExpirationWarningTaskExecutor

Sends warning notification before password expires. Notification is not send to disabled identities. Days before has to be given as task's parameter (number greater than zero). More task could be configured e.g. for sending warning notification 14,7,3 days before password expires. Default notification topic is configured to email sender.

PasswordExpiredTaskExecutor

Sends warning notification after password expires. Notification is not send to disabled identities. Default notification topic is configured to email sender.

AccountProtectionExpirationTaskExecutor

Removes accounts with expired protection interval. Account has to have inProtection flag setted to true.

RetryProvisioningTaskExecutor

Retry failed provisioning operation periodically. When provisioning operation fails, then is logged into provisioning queue with result (state, exception, result code etc.) and new attempt time. Number of attempts is 6 and time between attempts grows (2 mins, 5 mins, 20 mins, 2 hours, 12 hours - configuration coming soon).

ExecuteScriptTaskExecutor

Long running task for execute script by code. Script can increment and initialize counter.

RemoveOldLogsTaskExecutor

Long running task for remove old logging event, logging event exception and logging event property. Parameter remove old logs than (days).

Parameters

  • days - removes logs older than given days count.

ProvisioningQueueTaskExecutor

Process provisioning operations in queue periodically. This LRT executes prepared (created) requests for provisioning, when target system is switched do use asynchronous provisioning.

Parameters

  • virtualSystem, values:
    • true - processes created operations from queue for virtual system only,
    • false - processes created operations from queue for non virtual system only,
    • null - if virtualSystem parameters is not configured, then processes created operations from queue for all systems.

SynchronizationSchedulableTaskExecutor

Schedule synchronization.

Parameters

  • Synchronization uuid - synchronization configuration to schedule.

AddNewAutomaticRoleTaskExecutor

Long running task for add newly added automatic role to users. Can be executed repetitively to assign role to unprocessed identities, after process was stopped or interrupted (e.g. by server restart).

Parameters

  • roleTreeNode - automatic role identifier.

RemoveAutomaticRoleTaskExecutor

Long running task for remove automatic roles from identities.

Parameters

  • roleTreeNode - automatic role identifier.

AddNewRoleCompositionTaskExecutor

@since 9.0.0

Long running task for add newly added role composition to users. Sub roles defined by this composition will be assigned to identities having superior role. Can be executed repetitively to assign unprocessed roles to identities, after process was stopped or interrupted (e.g. by server restart).

Parameters

  • role-composition-id - role composition identifier.

RemoveRoleCompositionTaskExecutor

@since 9.0.0

Long running task for remove assigned roles by given composition from identities.

Parameters

  • role-composition-id - role composition identifier.

IdentityContractExpirationTaskExecutor

Remove roles by expired identity contracts (⇒ removes assigned roles).

IdentityRoleExpirationTaskExecutor

Long running task for expired identity roles removal. Expected usage is in cooperation with CronTaskTrigger, running once a day after midnight.

IdentityRoleValidRequestTaskExecutor

When role was created with validity in future, then this executor publish even, when role starts to be valid. This is needed specially for account management, when new account for roles that was newly valid has to be created.

HrEnableContractProcess

@since 7.5.1

HR process - enable identity's contract process. The processes is started for contracts that are both valid (meaning validFrom and validTill) and enabled. This LRT should be configured even event processors for HR processes are enabled - this process depends on current date ⇒ event processors cannot work this way. Event processors checks active changes on given contract.

HrContractExclusionProcess

@since 7.5.1

HR process - identity's contract exclusion. The processes is started for contracts that are both valid (meaning validFrom and validTill) and excluded. This LRT is optional with event processors for HR processes. One of LRT or processors should be enabled / scheduled. If LRT is scheduled and processors are enabled, then this LRT just checks, if everything is done (contract is already excluded by processor).

HrEndContractProcess

@since 7.5.1

HR process - end of identity's contract process. The processes is started for contracts that are not valid (meaning validFrom and validTill). This LRT is optional with event processors for HR processes and IdentityContractExpirationTaskExecutor. One of this LRT or processors with IdentityContractExpirationTaskExecutor should be enabled / scheduled. If this LRT is scheduled and processors with IdentityContractExpirationTaskExecutor are enabled / scheduled, then this LRT just checks, if everything is done (contract is already expired by processor or IdentityContractExpirationTaskExecutor).

SelectCurrentContractSliceTaskExecutor

@since 8.1.0

Recalculate current using slices as contract. Find all slices which should be for actual date using as contract and copy their values to parent contracts.

ChangeConfidentialStorageKey

@since 8.2.0

Change key for crypt confidential storage. Taks can be started after you change key in application properties/file to newer. As parameter will be given old key.

Integration tests are the preferred way of testing stateful executors in combination with stubbing the returned set of items to process by Mockito, using a 'spy' on the executor. This way the developer has full control over the task and can test both processing and items retrieval independently. List through the existing test cases for details.

Module core has default implementation of AbstractScheduledTaskInitializer - InitCoreScheduledTask. This class is responsible for initializing default scheduled task. See IdmCoreScheduledTasks.xml for xml structure.

For another module is necessary implement subclass of AbstractScheduledTaskInitializer.

Scheduled task is initialized by type. If exists task with same type as in xml, task will not be initialized.

Future development

  • Support for the check of the competition of the running tasks. Now it is on the task implementation to check if it should be run or not. This could be extracted to the general.
  • Immediate task running is carried out through the scheduler - a simple trigger - it could be carried out directly through the service LongRunningTaskManager
  • Display of the scheduled triggers in the detail of the scheduled job