Refactor event bus and queue system; detect cycles in DI realization and make

src/cli/decorators.ts

@@ -13,7 +13,7 @@ export const CLIDirective = (): ClassDecorator => {
         if ( isInstantiableOf(target, Directive) ) {
             logIfDebugging('extollo.cli.decorators', 'Registering CLIDirective blueprint:', target)
             ContainerBlueprint.getContainerBlueprint()
-                .onResolve<CommandLine>(CommandLine, cli => {
+                .onResolve<CommandLine>(CommandLine, (cli: CommandLine) => {
                     cli.registerDirective(target as Instantiable<Directive>)
                 })
         } else {

src/cli/directive/queue/WorkDirective.ts

@@ -0,0 +1,39 @@
+import {Directive, OptionDefinition} from '../../Directive'
+import {Inject, Injectable} from '../../../di'
+import {Queue} from '../../../support/bus'
+
+@Injectable()
+export class WorkDirective extends Directive {
+    @Inject()
+    protected readonly queue!: Queue
+
+    getDescription(): string {
+        return 'pop a single item from the queue and execute it'
+    }
+
+    getKeywords(): string | string[] {
+        return 'queue-work'
+    }
+
+    getOptions(): OptionDefinition[] {
+        return []
+    }
+
+    async handle(): Promise<void> {
+        try {
+            const queueable = await this.queue.pop()
+            if ( !queueable ) {
+                this.info('There are no items in the queue.')
+                return
+            }
+
+            this.info(`Fetched 1 item from the queue`)
+            await queueable.execute()
+            this.success('Executed 1 item from the queue')
+        } catch (e: unknown) {
+            this.error('Failed to execute queueable:')
+            this.error(e)
+            process.exitCode = 1
+        }
+    }
+}

src/cli/service/CommandLineApplication.ts

@@ -9,6 +9,7 @@ import {TemplateDirective} from '../directive/TemplateDirective'
 import {RunDirective} from '../directive/RunDirective'
 import {RoutesDirective} from '../directive/RoutesDirective'
 import {RouteDirective} from '../directive/RouteDirective'
+import {WorkDirective} from '../directive/queue/WorkDirective'
 
 /**
  * Unit that takes the place of the final unit in the application that handles
@@ -46,6 +47,7 @@ export class CommandLineApplication extends Unit {
         this.cli.registerDirective(RunDirective)
         this.cli.registerDirective(RoutesDirective)
         this.cli.registerDirective(RouteDirective)
+        this.cli.registerDirective(WorkDirective)
 
         const argv = process.argv.slice(2)
         const match = this.cli.getDirectives()