hypervisor.hypervisor_factory.HypervisorFactory Class Reference

A singletone class for creating hypervisor driver objects. More...

Inheritance diagram for hypervisor.hypervisor_factory.HypervisorFactory:

Public Member Functions
def	__init__
	Instantiates a HypervisorFactory object. More...

Static Public Member Functions
def	get_hypervisor_instance
	Returns the hypervisor driver nstance. More...

Detailed Description

A singletone class for creating hypervisor driver objects.

For an instantiation of nf.io there can be exactly one object of only one type of hyperviosr. HyervisorFactory takes care of the creation logic.

Definition at line 11 of file hypervisor_factory.py.

Constructor & Destructor Documentation

def hypervisor.hypervisor_factory.HypervisorFactory.__init__	(		self,
			hypervisor_type = "DockerDriver"
	)

Instantiates a HypervisorFactory object.

Args: hypervisor_type: The type of hypervisor object to instantiate. Valid hypervisor types are 'DockerDriver' and 'Libvirt' for the time being.

Returns: Nothing. Initializaes the factory object.

Note: If this factory class is instantiated multiple times with different types of hypervisor_type argument then it raises a ValueError.

If this factory class is instantiated with a hypervisor type other than Docker or Libvirt it raises a TypeError.

Definition at line 34 of file hypervisor_factory.py.

    def __init__(self, hypervisor_type="DockerDriver"):
        if not HypervisorFactory.__hyp_instance:
            if hypervisor_type == "DockerDriver":
                HypervisorFactory.__hyp_instance_type = hypervisor_type
                HypervisorFactory.__hyp_instance = DockerDriver()
            elif hypervisor_type == "Libvirt":
                HypervisorFactory.__hyp_instance_type = hypervisor_type
                HypervisorFactory.__hyp_instance = Libvirt()
            else:
                raise TypeError(
                    "Invalid hypervisor type. Valid types are: Docker, Libvirt")
        elif HypervisorFactory.__hyp_instance_type != hypervisor_type:
            raise ValueError(
                "An instantiation of type " +
                HypervisorFactory.__hyp_instance_type +
                " already exists.")