def get_create_l7policy_flow(self):
        """Create a flow to create an L7 policy

        :returns: The flow for creating an L7 policy
        """
        create_l7policy_flow = linear_flow.Flow(constants.CREATE_L7POLICY_FLOW)
        create_l7policy_flow.add(
            lifecycle_tasks.L7PolicyToErrorOnRevertTask(requires=[
                constants.L7POLICY, constants.LISTENERS, constants.LOADBALANCER
            ]))
        create_l7policy_flow.add(
            database_tasks.MarkL7PolicyPendingCreateInDB(
                requires=constants.L7POLICY))
        create_l7policy_flow.add(
            a10_database_tasks.GetVThunderByLoadBalancer(
                requires=constants.LOADBALANCER,
                provides=a10constants.VTHUNDER))
        create_l7policy_flow.add(
            l7policy_tasks.CreateL7Policy(requires=[
                constants.L7POLICY, constants.LISTENERS, a10constants.VTHUNDER
            ]))
        create_l7policy_flow.add(
            database_tasks.MarkL7PolicyActiveInDB(requires=constants.L7POLICY))
        create_l7policy_flow.add(
            database_tasks.MarkLBAndListenersActiveInDB(
                requires=[constants.LOADBALANCER, constants.LISTENERS]))
        create_l7policy_flow.add(
            vthunder_tasks.WriteMemory(requires=a10constants.VTHUNDER))
        create_l7policy_flow.add(
            a10_database_tasks.SetThunderUpdatedAt(
                requires=a10constants.VTHUNDER))
        return create_l7policy_flow
    def get_create_l7policy_flow(self, topology):
        """Create a flow to create an L7 policy

        :returns: The flow for creating an L7 policy
        """
        create_l7policy_flow = linear_flow.Flow(constants.CREATE_L7POLICY_FLOW)
        create_l7policy_flow.add(
            lifecycle_tasks.L7PolicyToErrorOnRevertTask(requires=[
                constants.L7POLICY, constants.LISTENERS, constants.LOADBALANCER
            ]))
        create_l7policy_flow.add(
            vthunder_tasks.VthunderInstanceBusy(
                requires=a10constants.COMPUTE_BUSY))

        create_l7policy_flow.add(
            database_tasks.MarkL7PolicyPendingCreateInDB(
                requires=constants.L7POLICY))
        create_l7policy_flow.add(
            a10_database_tasks.GetVThunderByLoadBalancer(
                requires=constants.LOADBALANCER,
                provides=a10constants.VTHUNDER))
        if topology == constants.TOPOLOGY_ACTIVE_STANDBY:
            create_l7policy_flow.add(
                vthunder_tasks.GetMasterVThunder(
                    name=a10constants.GET_MASTER_VTHUNDER,
                    requires=a10constants.VTHUNDER,
                    provides=a10constants.VTHUNDER))
        create_l7policy_flow.add(
            l7policy_tasks.CreateL7Policy(requires=[
                constants.L7POLICY, constants.LISTENERS, a10constants.VTHUNDER
            ]))
        create_l7policy_flow.add(
            database_tasks.MarkL7PolicyActiveInDB(requires=constants.L7POLICY))
        create_l7policy_flow.add(
            database_tasks.MarkLBAndListenersActiveInDB(
                requires=[constants.LOADBALANCER, constants.LISTENERS]))
        create_l7policy_flow.add(
            vthunder_tasks.WriteMemory(requires=a10constants.VTHUNDER))
        create_l7policy_flow.add(
            a10_database_tasks.SetThunderUpdatedAt(
                requires=a10constants.VTHUNDER))
        return create_l7policy_flow