[Cache] removeAll: remove all files in cache path

[hpique]

Remove all files in cache path no matter if the format was registered or not. Fixes #125.

[dcharbonnier]

you don't want to check the return value ? at least for log ?

[hpique]

@dcharbonnier Good call.

[dcharbonnier]

this is suspicious :

override func tearDown() {
        sut.removeAll()
        super.tearDown()
    }

I think it should be

override func tearDown() {
  sut.removeAll() {
    super.tearDown()
  }
}

[hpique]

super.tearDown should always be called within tearDown. This should do the trick:

override func tearDown() {
    let semaphore = dispatch_semaphore_create(0)
    sut.removeData() {
        dispatch_semaphore_signal(semaphore)
    }
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER)
    super.tearDown()
}

Which basically makes removeAllData synchronous.

[dcharbonnier]

right, removeAllData or removeAll ?

[hpique]

Both. Same problem in DiskCacheTests.

[hpique]

Actually, what I posted is wrong as it would block the main queue. Threading is hard. Will revisit in a bit.