ReducedMetric.java

package backtype.storm.metric.api;

public class ReducedMetric implements IMetric {
	private final IReducer _reducer;
	private Object _accumulator;

	public ReducedMetric(IReducer reducer) {
		_reducer = reducer;
		_accumulator = _reducer.init();
	}

	public void update(Object value) {
		_accumulator = _reducer.reduce(_accumulator, value);
	}

	public Object getValueAndReset() {
		Object ret = _reducer.extractResult(_accumulator);
		_accumulator = _reducer.init();
		return ret;
	}
}