Advantages:

— Flexibility and expandability: Allows for easy introduction of new types of products without changing existing code.
— Reducing dependencies: The Factory Method reduces the direct dependency between classes that create and use objects, making code modification and testing simpler.
— Ease of maintenance and updates: Code using the pattern is easier to maintain and update, as adding a new type of product often doesn’t require changes to the existing code that uses the factory.

Disadvantages:

— Complex architecture: Using Factory Method can complicate application architecture, especially when used unnecessarily or in simple scenarios.
— Code bloat: Creating many factory methods and classes can overload the code, making it hard to understand, particularly for new developers.
— Performance issues: In some cases, particularly with incorrect implementation, Factory Method can affect application performance due to additional method calls and object creations.
— Debugging difficulty: Following this pattern can make debugging harder since the actual object creation is hidden within the factory method, complicating error tracking.
— Need for careful planning: Effective use of Factory Method requires detailed planning and understanding of when and what objects should be created. Planning errors can lead to incorrect or excessive implementation.
— Limited flexibility in some scenarios: While Factory Method provides flexibility in object creation, it can be limited in scenarios requiring very dynamic or conditional object creation.
— Not suitable for simple applications: For small or simple applications with a relatively static structure, using Factory Method might be unnecessary and complicate the project.

...when a user wants to navigate to other routes having pending data changes in the current page...

The Saga pattern addresses this by breaking a transaction into smaller, local transactions handled by different services.

— Orchestration-Based Saga: A single orchestrator (arranger) manages all the transactions and directs services to execute local transactions.
— Choreography-Based Saga: All the services that are part of the distributed transaction publish a new event after completing their local transaction.

— Booking Service: Starts the process by reserving a room. This is the first local transaction. Once successful, it sends a message to the Payment Service to process the payment.
— Payment Service: Receives the message and processes the payment. If the payment is successful, it commits its local transaction and informs the Booking Service and Notification Service.
— Notification Service: On receiving confirmation of successful payment, it sends a booking confirmation email to the user.
— Handling Failures: If the Payment Service encounters an issue (e.g., payment decline), it returns a failure message to the Booking Service. The Booking Service then executes a compensating transaction to cancel the room reservation, ensuring the system returns to its original consistent state.

— Node.js project with necessary dependencies (express, amqplib, nodemailer, mongoose, dotenv) installed.
— RabbitMQ server running locally or remotely.
— Email server or service for the Notification Service (e.g., Nodemailer with SMTP or an email API service).

...This approach simplifies the reactive component state management in Angular applications, making the code more declarative and easier to maintain...