GetInstance returns the singleton instance.

NewActiveObject creates a new ActiveObject.

NewBarrier creates a new Barrier with the given count.

NewDatabase creates a new Database instance.

NewProxy creates a new Proxy.

NewWorker creates a new Worker with the given id and barrier.

ActiveObject encapsulates its own thread of control and executes methods asynchronously.

Barrier represents a synchronization barrier.

Database represents a dummy database.

MethodRequest encapsulates a method call along with its arguments.

Proxy acts as a wrapper around the ActiveObject and forwards method calls to it.

Singleton represents a singleton object.

Worker represents a worker goroutine.