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package main;
import org.joda.time.LocalDateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
/**
* Prints some progress.
*
* @author Peter Wu
*/
public class Watcher implements Runnable {
private final Progressable main;
/**
* Interval in seconds in which the status information is updated.
*/
private final int interval;
private final DateTimeFormatter df;
private int elapsed_seconds = 0;
private int previousCount = 0;
public Watcher(Progressable main, int interval) {
this.main = main;
this.interval = interval;
df = DateTimeFormat.forPattern("YYYY-MM-dd HH:mm:ss");
}
@Override
public void run() {
int newCount = main.getCount();
if (newCount < 1) {
// database connection is being established? Whatever is the case,
// no status information should be printed.
return;
}
int objects_per_min = (newCount - previousCount) * 60 / interval;
int objects_per_sec = objects_per_min / 60;
elapsed_seconds += interval;
// objects per min based on total number of objects and elapsed time
int total_objects_per_min = newCount * 60 / elapsed_seconds;
String datetime = df.print(new LocalDateTime());
// store new objects count for next sample
previousCount = newCount;
System.err.println(datetime + " Processed objects: " + newCount
+ " (total: " + total_objects_per_min + " objects/min)"
+ " (last interval: " + objects_per_sec + " objects/sec, "
+ objects_per_min + " objects/min)");
}
public interface Progressable {
/**
* @return The progress of the program or 0 if it was not started yet.
* It must be a monotonically increasing value.
*/
public int getCount();
}
}
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