stream.monitor.MemoryUsage Maven / Gradle / Ivy
/**
*
*/
package stream.monitor;
import java.util.concurrent.atomic.AtomicLong;
import stream.Processor;
import stream.data.Data;
import stream.data.Statistics;
import stream.statistics.StatisticsService;
/**
*
* A simple processor that provides statistics about the current Java VM memory
* usage.
*
*
* @author Christian Bockermann <[email protected]>
*
*/
public class MemoryUsage implements Processor, StatisticsService {
AtomicLong memoryUsed = new AtomicLong(0L);
/**
* @see stream.service.Service#reset()
*/
@Override
public void reset() throws Exception {
memoryUsed.set(0L);
}
/**
* @see stream.statistics.StatisticsService#getStatistics()
*/
@Override
public Statistics getStatistics() {
Statistics stats = new Statistics();
stats.put("@memory:jvm", memoryUsed.doubleValue());
return stats;
}
/**
* @see stream.Processor#process(stream.data.Data)
*/
@Override
public Data process(Data input) {
System.gc();
Runtime rt = Runtime.getRuntime();
long usedMB = (rt.totalMemory() - rt.freeMemory());
memoryUsed.set(usedMB);
return input;
}
}