using Dart in the client part of a web app where i have an application manager that contains a List of application instances and references to services that are used by each application as in the following diagram

as you can see the application manager is a singleton, so are the services that it contains which are used by all apps, to me it makes sense because

• i need to have only one instance of the ApplicationManager and each service
• easier to access services without the need to pass references
• i need to preserve the state of each service
• almost all services have a cache

i found ways to avoid having the services as singletons which is by making them private to the library which is a feature in dart, so i initialize the services only once from the application manager, but i can't make the ApplicationsManager private because its at the top most level of the library, i would appreciate your thoughts for a way to avoid having the application manager as a singelton

Using Dart in the client part of a web app where I have an application manager that contains a List of application instances and references to services that are used by each application as in the following diagram

As you can see the application manager is a singleton, so are the services that it contains which are used by all apps, to me it makes sense because

• I need to have only one instance of the ApplicationManager and each service
• Easier to access services without the need to pass references
• I need to preserve the state of each service
• Almost all services have a cache

I found ways to avoid having the services as singletons which is by making them private to the library which is a feature in dart, so I initialize the services only once from the application manager, but I can't make the ApplicationsManager private because its at the top most level of the library, I would appreciate your thoughts for a way to avoid having the application manager as a singelton.

using Dart in the client part of a web app where i have an application manager that contains a List of application instances and references to services that are used by each application as in the following diagram

as you can see the application manager is a singleton, so are the services that it contains which are used by all apps, to me it makes sense because

• i need to have only one instance of the ApplicationManager and each service
• easier to access services without the need to pass references
• i need to preserve the state of each service
• almost all services have a cache

i found ways to avoid having the services as singletons which is by making them private to the library which is a feature in dart, so i initialize the services only once from the application manager, but i can't make the ApplicationsManager private because its at the top most level of the library, i would appreciate your thoughts for a way to avoid having the application manager as a singelton

how about a static boolean field that gets checked in the constructor of ApplicationManager class?

using Dart in the client part of a web app where i have an application manager that contains a List of application instances and references to services that are used by each application as in the following diagram

as you can see the application manager is a singleton, so are the services that it contains which are used by all apps, to me it makes sense because

• i need to have only one instance of the ApplicationManager and each service
• easier to access services without the need to pass references
• i need to preserve the state of each service
• almost all services have a cache

i found ways to avoid having the services as singletons which is by making them private to the library which is a feature in dart, so i initialize the services only once from the application manager, but i can't make the ApplicationsManager private because its at the top most level of the library, i would appreciate your thoughts for a way to avoid having the application manager as a singelton