co.cask.cdap.runtime.spi.provisioner

Interface PollingStrategy

public interface PollingStrategy

Defines how CDAP should poll for cluster status while waiting for a cluster to change state. For example, if it takes at least two minutes to create a cluster, a provisioner can use a strategy where it first waits two minutes, then polls every ten seconds. See PollingStrategies for some common strategies.

Method Summary

Modifier and Type	Method and Description
long	nextPoll(int numPolls, long startTime) Return the number of milliseconds to wait before the next poll, given the time that polling began, and the number of polls already attempted.

Method Detail

nextPoll

long nextPoll(int numPolls,
              long startTime)

Return the number of milliseconds to wait before the next poll, given the time that polling began, and the number of polls already attempted. Returning 0 or less means the next poll will be tried immediately.

Parameters:

numPolls - the number of times the status was polled already. Starts at 0.

startTime - the timestamp in milliseconds that polling began.

Returns:

the number of milliseconds to wait before the next poll