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Orchestrator

Blong includes the following commonly used orchestrators:

Dispatch​

The dispatch orchestrator enables calling the attached handlers using the configured namespace, optionally falling back to the configured destination, when no handler is defined. This is often used as an intermediate place to include some logic, before calling a database adapter or another downstream adapter.

Configuration properties:

destination: sql            # call the method in another namespace when
                            # no method handler exists in the orchestrator
import { orchestrator } from '@feasibleone/blong';

export default orchestrator(() => ({
    extends: 'orchestrator.dispatch'
}));

Schedule​

The schedule orchestrator is used to invoke functionality based on predefined schedule.

Configuration properties:

schedule:
  handlerName: 0 0 * * *    # call the handler, using the specified cron pattern
import { orchestrator } from '@feasibleone/blong';

export default orchestrator(() => ({
    extends: 'orchestrator.schedule'
}));

Configuration​

All orchestrators share some common configuration properties, such as:

  • logLevel - the log level for the orchestrator
  • namespace - prefixes used to call the orchestrator API
  • imports - handlers to attach in the orchestrator
  • validations - validations to attach in the orchestrator

See the configuration pattern for more details about the places where adapters and orchestrators can be configured.