Examples of org.springframework.util.StopWatch

org.springframework.util.StopWatch
Simple stop watch, allowing for timing of a number of tasks, exposing total running time and running time for each named task.
Conceals use of System.currentTimeMillis(), improving the readability of application code and reducing the likelihood of calculation errors.
Note that this object is not designed to be thread-safe and does not use synchronization.
This class is normally used to verify performance during proof-of-concepts and in development, rather than as part of production applications. @author Rod Johnson @author Juergen Hoeller @author Sam Brannen @since May 2, 2001

    int leftCount = 2;
    Map beans = new HashMap();
    beans.put("status1",status);
    beans.put("leftCount", leftCount);
    Boolean result = true;
    /**!
     * 首先是apache的exp，看看效率如何
     */
    final StopWatch clock = new StopWatch("Performance");
    clock.start("jexl2");
    for(int i=0;i<count;i++){
      Configuration conf = new Configuration();
      ExpressionParser exprParser = new ExpressionParser( test, beans, conf );
          Expression testExpr = exprParser.parse();
          try {
              result = (Boolean) testExpr.evaluate();
          } catch (Exception e) {
            e.printStackTrace();
          }
    }
    clock.stop();
//        System.out.println(clock.prettyPrint());
        /**!
         * 其次是MVEL，看看效率如何
         */
        clock.start("MVEL");
        for(int i=0;i<count;i++){
          result = (Boolean)ScriptEvaluator.evalWithMVEL(test.substring(2, test.length()-1),beans);
        }
        clock.stop();
        System.out.println(clock.prettyPrint());
        
  }

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   * @see #setExitMessage
   * @see #setExceptionMessage
   */
  protected Object invokeUnderTrace(MethodInvocation invocation, Log logger) throws Throwable {
    String name = invocation.getMethod().getDeclaringClass().getName() + "." + invocation.getMethod().getName();
    StopWatch stopWatch = new StopWatch(name);
    Object returnValue = null;
    boolean exitThroughException = false;
    try {
      stopWatch.start(name);
      writeToLog(logger,
          replacePlaceholders(this.enterMessage, invocation, null, null, -1));
      returnValue = invocation.proceed();
      return returnValue;
    }
    catch (Throwable ex) {
      if(stopWatch.isRunning()) {
        stopWatch.stop();
      }
      exitThroughException = true;
      writeToLog(logger,
          replacePlaceholders(this.exceptionMessage, invocation, null, ex, stopWatch.getTotalTimeMillis()), ex);
      throw ex;
    }
    finally {
      if (!exitThroughException) {
        if(stopWatch.isRunning()) {
          stopWatch.stop();
        }
        writeToLog(logger,
            replacePlaceholders(this.exitMessage, invocation, returnValue, null, stopWatch.getTotalTimeMillis()));
      }
    }
  }

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public class MethodDecorator implements MethodInterceptor{
  private static final Logger LOG = LoggerFactory
  .getLogger(MethodDecorator.class);
  @Override
  public Object invoke(final MethodInvocation arg0) throws Throwable {
       final StopWatch clock = new StopWatch(
               "Profiling for '" + arg0.getClass().getName() + "' and '" + arg0.getArguments() + "'");
         try {
            clock.start(arg0.getMethod().getName());
            return arg0.proceed();
         } finally {
            clock.stop();
            LOG.info(clock.prettyPrint());
         }    
  }

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    public void setOrder(final int order) {
        this.order = order;
    }
    
  public Object profile(final ProceedingJoinPoint call) throws Throwable {
        final StopWatch clock = new StopWatch(call.toLongString());
        String argValue = null;
        try {
           clock.start(call.toShortString());
           return call.proceed();
        } finally {
           clock.stop();
           StringBuffer sb = new StringBuffer();
           sb.append("\n");
           sb.append(clock.prettyPrint());
           
           Object[] args = call.getArgs();
           if(args!=null&&args.length>0){
             sb.append("With ");
             sb.append(args.length);

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   * @see #setExitMessage
   * @see #setExceptionMessage
   */
  protected Object invokeUnderTrace(MethodInvocation invocation, Log logger) throws Throwable {
    String name = invocation.getMethod().getDeclaringClass().getName() + "." + invocation.getMethod().getName();
    StopWatch stopWatch = new StopWatch(name);
    Object returnValue = null;
    boolean exitThroughException = false;
    try {
      stopWatch.start(name);
      writeToLog(logger,
          replacePlaceholders(this.enterMessage, invocation, null, null, -1));
      returnValue = invocation.proceed();
      return returnValue;
    }
    catch (Throwable ex) {
      if(stopWatch.isRunning()) {
        stopWatch.stop();
      }
      exitThroughException = true;
      writeToLog(logger,
          replacePlaceholders(this.exceptionMessage, invocation, null, ex, stopWatch.getTotalTimeMillis()), ex);
      throw ex;
    }
    finally {
      if (!exitThroughException) {
        if(stopWatch.isRunning()) {
          stopWatch.stop();
        }
        writeToLog(logger,
            replacePlaceholders(this.exitMessage, invocation, returnValue, null, stopWatch.getTotalTimeMillis()));
      }
    }
  }

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    assertEquals("", ServletRequestUtils.getRequiredStringParameter(request, "paramEmpty"));
  }


  public void testGetIntParameterWithDefaultValueHandlingIsFastEnough() {
    MockHttpServletRequest request = new MockHttpServletRequest();
    StopWatch sw = new StopWatch();
    sw.start();
    for (int i = 0; i < 1000000; i++) {
      ServletRequestUtils.getIntParameter(request, "nonExistingParam", 0);
    }
    sw.stop();
    System.out.println(sw.getTotalTimeMillis());
    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }

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    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }


  public void testGetLongParameterWithDefaultValueHandlingIsFastEnough() {
    MockHttpServletRequest request = new MockHttpServletRequest();
    StopWatch sw = new StopWatch();
    sw.start();
    for (int i = 0; i < 1000000; i++) {
      ServletRequestUtils.getLongParameter(request, "nonExistingParam", 0);
    }
    sw.stop();
    System.out.println(sw.getTotalTimeMillis());
    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }

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    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }


  public void testGetFloatParameterWithDefaultValueHandlingIsFastEnough() {
    MockHttpServletRequest request = new MockHttpServletRequest();
    StopWatch sw = new StopWatch();
    sw.start();
    for (int i = 0; i < 1000000; i++) {
      ServletRequestUtils.getFloatParameter(request, "nonExistingParam", 0f);
    }
    sw.stop();
    System.out.println(sw.getTotalTimeMillis());
    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }

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    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }


  public void testGetDoubleParameterWithDefaultValueHandlingIsFastEnough() {
    MockHttpServletRequest request = new MockHttpServletRequest();
    StopWatch sw = new StopWatch();
    sw.start();
    for (int i = 0; i < 1000000; i++) {
      ServletRequestUtils.getDoubleParameter(request, "nonExistingParam", 0d);
    }
    sw.stop();
    System.out.println(sw.getTotalTimeMillis());
    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }

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    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }


  public void testGetBooleanParameterWithDefaultValueHandlingIsFastEnough() {
    MockHttpServletRequest request = new MockHttpServletRequest();
    StopWatch sw = new StopWatch();
    sw.start();
    for (int i = 0; i < 1000000; i++) {
      ServletRequestUtils.getBooleanParameter(request, "nonExistingParam", false);
    }
    sw.stop();
    System.out.println(sw.getTotalTimeMillis());
    assertTrue("getStringParameter took too long: " + sw.getTotalTimeMillis(), sw.getTotalTimeMillis() < 250);
  }

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