Dan Haywood created ISIS-661:
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Summary: BackgroundService and BackgroundTaskService as a way of
creating mementos to execute jobs asynchronously
Key: ISIS-661
URL: https://issues.apache.org/jira/browse/ISIS-661
Project: Isis
Issue Type: New Feature
Components: Core, Objectstore: JDO
Affects Versions: core-1.3.0, objectstore-jdo-1.3.0
Reporter: Dan Haywood
Assignee: Dan Haywood
Fix For: objectstore-jdo-1.4.0, core-1.4.0
BackgroundService is the service that creates the mementos, with a default
implementation in isis-core.
usage:
public void submitInvoices() {
for(Customer customer: customerRepository.findCustomersToInvoice()) {
backgroundService.execute(customer).submitInvoice();
}
}
@javax.inject.Inject
private BackgroundService backgroundService;
Here the service creates a javassist proxy through which it can figure out the
arguments. The MementoService and BookmarkService can be used to create the
memento string (XML).
~~~~~~~~~~~~~
BackgroundTaskService is the service that persists the mementos, with a default
implementation in objectstore-jdo. Each persisted BackgroundTask should be
associated with the transactionId of the Interaction (see ISIS-660).
~~~~
also:
- require separate "contributions" service to add in the BackgroundTask
collection to the Interaction.
~~~~
NB: the docs should indicate that an alternative implementation for
BackgroundTaskService could be webhooks. Per Maurizio's comment:
a web hook is basically an HTTP callback
An example of web hook is available on the Google infrastructure, where task
longer than 30 sec. are not allowed.
This is similar to your idea of background service:
public void calculateInvoices() {
for(Customer customer: customerRepository.findCustomersToInvoice()) {
Queue queue = QueueFactory.getDefaultQueue();
queue.add(withUrl("/worker").param("id", customer.getId()));
}
}
Tasks added to the queue will execute by calling the request handler at the URL
/worker with the parameter id at a given task rate.
https://developers.google.com/appengine/docs/java/taskqueue/overview-push
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