CallStatistics.java

package net.sf.appstatus.services;

public class CallStatistics {

	private Long maxResponseTime;
	private double avgResponseTime = 0;
	private long failures = 0;
	private long errors = 0;
	private long hits = 0;
	private Long minResponseTime;
	private double avgNestedCalls = 0;

	private int minMaxDelay;

	/**
	 * Because firsts runs are always longer than real times, min and max
	 * measurements can be delayed until the services is called a few times.
	 * 
	 * @param minMaxDelay
	 *            number of hits before starting to measure min and max times.
	 */
	public CallStatistics(int minMaxDelay) {
		this.minMaxDelay = minMaxDelay;
	}

	public Long getMaxResponseTime() {
		return maxResponseTime;
	}

	public double getAvgResponseTime() {
		return avgResponseTime;
	}

	public long getFailures() {
		return failures;
	}

	public long getErrors() {
		return errors;
	}

	public long getHits() {
		return hits;
	}

	public Long getMinResponseTime() {
		return minResponseTime;
	}

	/**
	 * @return the avgNestedCalls
	 */
	public double getAvgNestedCalls() {
		return avgNestedCalls;
	}

	public void addCall(Long executionTime, boolean failure, boolean error, int nestedCalls) {
		synchronized (this) {
			hits++;
			if (failure) {
				failures++;
			}

			if (error) {
				errors++;
			}

			if (hits > minMaxDelay) {
				if (maxResponseTime == null || maxResponseTime < executionTime) {
					maxResponseTime = executionTime;
				}

				if (minResponseTime == null || minResponseTime > executionTime) {
					minResponseTime = executionTime;
				}
			}

			avgResponseTime = (avgResponseTime * (hits - 1) + executionTime) / (hits);

			avgNestedCalls = (avgNestedCalls * (hits - 1) + (double) nestedCalls) / hits;
		}

	}
}