Angular View Providers: Dynamic Component Creation

Angular's dependency injection system is powerful, but sometimes you need more flexibility than what's offered by standard component providers. This challenge focuses on using ViewProviders to dynamically create and inject services into components, allowing for highly configurable and reusable component structures. You'll be building a system where the services available to a component are determined at runtime, not compile time.

Problem Description

You are tasked with creating a reusable DynamicComponent that can accept a list of service tokens as input and dynamically inject those services into the component. This will be achieved using ViewProviders. The DynamicComponent should:

1. Accept an array of service tokens (e.g., [MyService1, MyService2]) as input.
2. Use ViewProviders to register these tokens with Angular's dependency injection system.
3. Have a method, displayServices(), that retrieves all injected services of the provided tokens and logs their names to the console.
4. Handle the case where a requested service token is not provided.

Key Requirements:

• The component must be able to dynamically inject services based on the input token array.
• The injected services must be accessible within the component.
• The displayServices() method must correctly retrieve and log the names of the injected services.
• The component should gracefully handle cases where a service token is not provided.

Expected Behavior:

When the DynamicComponent is initialized with a list of service tokens, Angular should inject instances of those services into the component. Calling displayServices() should then log the names of the injected services to the console. If a service token is not provided, the displayServices() method should not throw an error and should continue to log the names of the services that are available.

Edge Cases to Consider:

• Empty input array of service tokens.
• Service tokens that are not injectable (e.g., a primitive type).
• Circular dependencies (though this challenge doesn't explicitly require handling them, be mindful of potential issues).
• Services with different constructors (ensure the tokens match the actual service implementations).

Examples

Example 1:

Input: DynamicComponent( [MyService1, MyService2] )
Output:
console.log("MyService1");
console.log("MyService2");
Explanation: The component is initialized with MyService1 and MyService2. displayServices() retrieves and logs their names.

Example 2:

Input: DynamicComponent( [MyService1, MyService2, NonExistentService] )
Output:
console.log("MyService1");
console.log("MyService2");
Explanation: The component is initialized with MyService1, MyService2, and a non-existent service. displayServices() retrieves and logs the names of MyService1 and MyService2, ignoring NonExistentService. No error is thrown.

Example 3:

Input: DynamicComponent( [] )
Output:
(No output to console)
Explanation: The component is initialized with an empty array of service tokens. displayServices() does not execute, and nothing is logged.

Constraints

• The solution must be written in TypeScript.
• The solution must use Angular's ViewProviders to achieve dynamic service injection.
• The displayServices() method should not throw errors if a service token is not found.
• The solution should be modular and reusable.
• Assume MyService1 and MyService2 are defined elsewhere and are injectable services. For testing purposes, you can create simple mock services.

Notes

• Consider using Injector.get() to retrieve the injected services.
• Think about how to handle potential errors gracefully.
• The focus is on demonstrating the use of ViewProviders for dynamic service injection, not on complex error handling or advanced dependency injection patterns.
• You'll need to create mock services for testing purposes if you don't have existing services available. These mocks should simply have a name property.