一个java时间辅助工具类

TimeMeasure是我以前写的一个java 辅助类，开发人员可以用它们在控制台打印任意两个步骤之间的时间消耗。中途可以pause这个时间计数方法，然后再resume回来，pause的时间是不计入到实际方法消耗的时间的。使用方法见TimeMeasure的main方法,另外如果你愿意，可以拓展它用log4j或者其他方式输出到文件。

TimeMeasure.java

Java代码







public class TimeMeasure {

// PTODO create junit test class

private static HashMap<String, TimeStack> timers;

private static int indent = 0;

/**

* measureActive is true by default. A true value means that all methods calls are processed else no one.

*/

public static boolean measureActive = true;

/**

* display is true by default. A true value means that all informations are displayed.

*/

public static boolean display = true;

public static boolean displaySteps = true;

/**

*

* DOC hywang Comment method "start".

*

* @param idTimer

*/

public static void begin(String idTimer) {

if (!measureActive) {

return;

}

init();

if (timers.containsKey(idTimer)) {

if (display) {

System.out.println(indent(indent) + "Warning (start): timer " + idTimer + " already exists"); //$NON-NLS-1$ //$NON-NLS-2$

}

} else {

indent++;

TimeStack times = new TimeStack();

timers.put(idTimer, times);

if (display) {

System.out.println(indent(indent) + "Start '" + idTimer + "' ..."); //$NON-NLS-1$ //$NON-NLS-2$

}

}

}

/**

*

* DOC hywang Comment method "end".

*

* @param idTimer

* @return total elapsed time since start in ms

*/

public static long end(String idTimer) {

if (!measureActive) {

return 0;

}

init();

if (!timers.containsKey(idTimer)) {

if (display) {

System.out.println(indent(indent) + "Warning (end): timer " + idTimer + " doesn't exist"); //$NON-NLS-1$ //$NON-NLS-2$

}

return -1;

} else {

TimeStack timeStack = timers.get(idTimer);

timers.remove(idTimer);

long elapsedTimeSinceLastRequest = timeStack.getLastStepElapsedTime();

if (display && displaySteps) {

System.out.println(indent(indent) + "End '" + idTimer + "', elapsed time since last request: " //$NON-NLS-1$ //$NON-NLS-2$

+ elapsedTimeSinceLastRequest + " ms "); //$NON-NLS-1$

}

long totalElapsedTime = timeStack.getTotalElapsedTime();

if (display) {

System.out.println(indent(indent) + "End '" + idTimer + "', total elapsed time: " + totalElapsedTime + " ms "); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

}

indent--;

return totalElapsedTime;

}

}

/**

*

* DOC hywang Comment method "timeSinceBegin".

*

* @param idTimer

* @return total elapsed time since start in ms

*/

public static long timeSinceBegin(String idTimer) {

if (!measureActive) {

return 0;

}

init();

if (!timers.containsKey(idTimer)) {

if (display) {

System.out.println(indent(indent) + "Warning (end): timer " + idTimer + " does'nt exist"); //$NON-NLS-1$ //$NON-NLS-2$

}

return -1;

} else {

long time = timers.get(idTimer).getTotalElapsedTime();

if (display) {

System.out.println(indent(indent) + "-> '" + idTimer + "', elapsed time since start: " + time + " ms "); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$

}

return time;

}

}