ProtectedconstructorNumber of registered shutdownables. Exposed for tests and diagnostics.
Whether a ShutdownAll() is currently in flight. Exposed so singletons can
skip per-request work during teardown without hard-stopping.
StaticInstanceThe Global Object Store is a place to store global objects that need to be shared across the application. Depending on the execution environment, this could be the window object in a browser, or the global object in a node environment, or something else in other contexts. The key here is that in some cases static variables are not truly shared because it is possible that a given class might have copies of its code in multiple paths in a deployed application. This approach ensures that no matter how many code copies might exist, there is only one instance of the object in question by using the Global Object Store.
Snapshot of registered shutdownables (useful for diagnostics). Returns a copy — mutations don't affect the registry.
Add a shutdownable to the registry. Safe to call multiple times for the same instance — duplicates are ignored. Should be invoked from the singleton's constructor so registration happens automatically.
Drop all registered items without calling their Shutdown methods. Test-only.
Invoke Shutdown() on every registered item. Errors from individual items
are caught and logged; remaining items still run. Concurrency is sequential
to avoid surprising teardown-order interactions. Returns when all items
settle.
Remove a shutdownable from the registry. Use when an instance has its own lifecycle separate from the process (rare for singletons).
Protected StaticgetReturns the singleton instance of the class. If the instance does not exist, it is created and stored in the Global Object Store. If className is provided it will be used as part of the key in the Global Object Store, otherwise the actual class name will be used. NOTE: the class name used by default is the lowest level of the object hierarchy, so if you have a class that extends another class, the lowest level class name will be used.
OptionalclassName: string
Process-wide registry of
IShutdownableinstances. Stored in the global object store (viaBaseSingleton) so it's truly singleton across bundler-duplicated code paths. WireSIGTERM/SIGINThandlers toShutdownAll()once at app entry — singletons self-register from their constructors and need no further coordination.