/
RelativeDelayIterator.java
65 lines (52 loc) · 1.07 KB
/
RelativeDelayIterator.java
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package iterator;
import helpers.ExceptionUtil;
import java.util.Iterator;
import org.apache.commons.lang.time.StopWatch;
import org.apache.log4j.Logger;
public class RelativeDelayIterator<T>
implements Iterator<T>
{
private static Logger logger = Logger.getLogger(DelayIterator.class);
private Iterator<T> iterator;
private StopWatch stopWatch;
private int delay;
public RelativeDelayIterator(Iterator<T> iterator, int delay)
{
this.iterator = iterator;
this.delay = delay;
}
@Override
public boolean hasNext()
{
return iterator.hasNext();
}
@Override
public T next()
{
if (stopWatch == null) {
stopWatch = new StopWatch();
}
else {
stopWatch.stop();
long delta = delay - stopWatch.getTime();
if (delta > 0) {
try {
logger.info("Waiting " + delta + " ms");
Thread.sleep(delta, 0);
}
catch (Exception e) {
logger.warn(ExceptionUtil.toString(e));
}
}
stopWatch.reset();
}
stopWatch.start();
T result = iterator.next();
return result;
}
@Override
public void remove()
{
iterator.remove();
}
}