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Code Issues Releases Wiki Activity

gpio: implement pin caching

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this allows for the short version of the API to work as expected as
consecutive calls to the same pin would now be internally working on the
pin instance (all the 3 currently supported types). closing a pin busts
the cache
This commit is contained in:
Karan Misra 2014-04-06 05:30:54 +05:30
parent 6f90af377d
commit 57328c979d
7 changed files with 164 additions and 22 deletions
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51
gpiodriver_test.go
View file

@ -6,7 +6,10 @@ import (
)
type fakeDigitalPin struct {
n int
id string
n int
drv GPIODriver
}
func (p *fakeDigitalPin) N() int {
@ -41,12 +44,12 @@ func (*fakeDigitalPin) PullDown() error {
return nil
}
func (*fakeDigitalPin) Close() error {
return nil
func (p *fakeDigitalPin) Close() error {
return p.drv.Unregister(p.id)
}
func newFakeDigitalPin(n int) DigitalPin {
return &fakeDigitalPin{n}
func newFakeDigitalPin(pd *PinDesc, drv GPIODriver) DigitalPin {
return &fakeDigitalPin{id: pd.ID, n: pd.DigitalLogical, drv: drv}
}
func TestGpioDriverDigitalPin(t *testing.T) {
@ -73,7 +76,10 @@ func TestGpioDriverDigitalPin(t *testing.T) {
}
type fakeAnalogPin struct {
n int
id string
n int
drv GPIODriver
}
func (p *fakeAnalogPin) N() int {
@ -92,8 +98,8 @@ func (*fakeAnalogPin) Close() error {
return nil
}
func newFakeAnalogPin(n int) AnalogPin {
return &fakeAnalogPin{n}
func newFakeAnalogPin(pd *PinDesc, drv GPIODriver) AnalogPin {
return &fakeAnalogPin{id: pd.ID, n: pd.AnalogLogical, drv: drv}
}
func TestGpioDriverAnalogPin(t *testing.T) {
@ -142,3 +148,32 @@ func TestGpioDriverUnavailablePinType(t *testing.T) {
t.Fatalf("Looking up analog pin 1: got error %q, expected %q", err, expected)
}
}
func TestGpioPinCaching(t *testing.T) {
pinMap := PinMap{
&PinDesc{ID: "P1_1", Aliases: []string{"1"}, Caps: CapDigital},
}
driver := newGPIODriver(pinMap, newFakeDigitalPin, nil, nil)
pin, err := driver.DigitalPin(1)
if err != nil {
t.Fatalf("Looking up digital pin 1: got %v", err)
}
// Lookup the same pin again
pin2, err := driver.DigitalPin(1)
if err != nil {
t.Fatalf("Looking up digital pin 1: got %v", err)
}
if pin != pin2 {
t.Fatalf("Looking up digital pin 1 for the second time: got %v, want %v", &pin2, &pin)
}
// Looking up a closed pin
pin.Close()
pin3, err := driver.DigitalPin(1)
if err != nil {
t.Fatalf("Looking up digital pin 1: got %v", err)
return
}
if pin == pin3 {
t.Fatal("Looking up a closed pin, but got the same old instance")
}
}