question: @ RpcMethod public void createVm ( String reservation , Map < String , String > environment , AsyncMethodCallback < Host . AsyncClient . create_vm_call > handler ) throws RpcException { ensureClient ( ) ; CreateVmRequest createVmRequest = new CreateVmRequest ( reservation ) ; if ( environment != null && ! environment . isEmpty ( ) ) { createVmRequest . setEnvironment ( environment ) ; } clientProxy . setTimeout ( CREATE_VM_TIMEOUT_MS ) ; logger . info ( "create_vm target {}, reservation {}, request {}" , getHostIp ( ) , reservation , createVmRequest ) ; try { clientProxy . create_vm ( createVmRequest , handler ) ; } catch ( TException e ) { throw new RpcException ( e . getMessage ( ) ) ; } }
target:  This method performs an asynchronous Thrift call to create a VM. On completion, the specified handler is invoked.