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wyldfyre@PITSWS190:~/temp$ python ObservableImplementation.py 
Test Single Observer [Generic]
Invoked GenericObserver with arguments  ('Hello', 'World', 'Test', 'Generic') {}
Test Multiple Observers [Generic, Logger, Email, WhatsApp]
Invoked GenericObserver with arguments  ('Hello', 'World', 'Test', 'Multiple') {}
Invoked LoggerObserver with arguments  ('Hello', 'World', 'Test', 'Multiple') {}
Invoked EmailerObserver with arguments  ('Hello', 'World', 'Test', 'Multiple') {}
Invoked WhatsApperObserver with arguments  ('Hello', 'World', 'Test', 'Multiple') {}
Test after removing Generic observer
Invoked LoggerObserver with arguments  ('Hello', 'World', 'Test', 'Multiple') {}

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/**
 * Boot the package. We wire some signals to slots here.
 *
 * @param \TYPO3\Flow\Core\Bootstrap $bootstrap The current bootstrap
 * @return void
 */
public function boot(\TYPO3\Flow\Core\Bootstrap $bootstrap) {
        $dispatcher = $bootstrap->getSignalSlotDispatcher();
        $dispatcher->connect(
                'Test\Package\Controller\MigrationController', 'afterDatabaseMigration',

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public function logMigrationSuceededMessage()
{
  $this->outputLine("Migration process completed successfully.");
}

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public function migrateCommand()
{
    //Other program logic specific code (if needed)
    $this->emitAfterDatabaseMigration();
    //Other program logic specific code (if needed)
}

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/**
 * @return void
 * @Flow\Signal
 */
protected function emitAfterDatabaseMigration() {}

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class ObservableEvent:
    def __init__(self):
        self.__observers = []
    def register_observer(self, observer):
        self.__observers.append(observer)
    def de_register_observer(self, observer):
        self.__observers.remove(observer)
    def notify(self, *args, **kwargs):
        for observer in self.__observers:
            observer.trigger(*args, **kwargs)