support exponential backoff when tailing files #17
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This commit extends the API of watch.NewPollingFileWatcher to accept options for how frequently files should be polled. By default, if the zero value is given, the previous value of polling every 250ms will be used. The customizable polling frequency supports exponential backoff; the polling frequency will be doubled every time polling results in no changes up to hitting MaxPollFrequency. The polling frequency is reset to MinPollFrequency when a file change is detected.
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This commit extends the API of watch.NewPollingFileWatcher to accept options for how frequently files should be polled. By default, if the zero value is given, the previous value of polling every 250ms will be used.
The customizable polling frequency supports exponential backoff; the polling frequency will be doubled every time polling results in no changes up to hitting MaxPollFrequency. The polling frequency is reset to MinPollFrequency when a file change is detected.