@Override
public <R, E extends Throwable> R doRetryable(
final IRetryableTask<R, E> task, final IRetryStrategy strategy)
throws RetryerException, InterruptedException {
checkArgument(task != null, "task can't be null");
checkArgument(strategy != null, "strategy can't be null");
int tryNo = 0;
final List<Throwable> reasons = Lists.newArrayList();
MDC.put("task", task.toString());
try {
while (true) {
try {
log.debug("try #{}...", tryNo);
if (Thread.interrupted()) {
throw new InterruptedException("Interrupted on " + tryNo + " try");
}
return task.execute(tryNo);
} catch (InterruptedException e) {
log.debug("try #{} interrupted: {}", tryNo, e.getMessage());
throw e;
} catch (final Throwable reason) {
log.debug("try #{} failed: {}", tryNo, reason.getMessage());
reasons.add(reason);
// cleanup
if (task.isFatalReason(tryNo, reason)) {
throw new RetryerException(reasons);
}
final RetryInfo retryInfo = strategy.shouldRetry(tryNo, reason);
if (retryInfo.shouldFail()) {
throw new RetryerException(reasons);
} else {
final long delay = retryInfo.delay();
if (delay > 0) {
log.debug("retry after {} ms", delay);
Thread.sleep(delay);
} else {
log.debug("retry now");
}
}
} finally {
tryNo++;
}
}
} finally {
MDC.remove("task");
}
}
