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package com.jamonapi.http;
import com.jamonapi.*;
import com.jamonapi.utils.Misc;
import java.lang.reflect.Method;
/** Stateless class used by HttpMonRequest to represent anything a request is monitoring.
* There will be one HttpMonItem in HttpMonFactory for each thing we are monitoring. The state information
* needed for monitoring a particular request is kept in HttpMonRequest. Note any of the mehtods that take
* a HttpMonRequest need some form of state associated with the request. By making HttpMonRequest stateful
* and HttpMonItem stateless a significant number of object creations were saved.
*
* @author Steven Souza
*
*/
class HttpMonItem {
private boolean isTimeMon;//used in JettyHttpMonItem
private String units="noUnitsProvided";// units used by jamon
private String label;// label used as a base by jamon
private String methodName;// method name that monitoring calls. getStatus, getRequestURI etc.
private String additionToLabel="";// u=url, v=value. possibilities are empty, u,v,uv,vu
private boolean isResponse=true;// Are we monitoring an HttpServletRequest or an HttpServletResponse
private Method method;
// containers put jessionid (and other params) as part of what is returned by getRequestURI, and getRequestURL. This can make
// many pages not unique enough to benefit from jamon, so by default this part of the url is removed from the monitoring label
// i.e. /myapp/mypage.jsp;jsessionid=320sljsdofou
// becomes the following to jamon
// /myapp/mypage.jsp
private boolean removeHttpParams=false;// remove httpParams of request from jamon label.
private static final Monitor NULL_MON=new NullMonitor();// used when disabled
HttpMonItem() {
}
/** Valid constructor arguments are case insensitive, and have to start with request, response to differentiate whether to use an object
* that inhertis from HttpServletRequest or HttpServletResponse respectively. This must be follwed by the methodname, units, an optional '.value',
* and a units. The method name will be executed. Note a unit of 'ms' would cause a timed monitor to be called.
*
* Examples: request.getRequestURI().ms, request.getRequestURI().ms.value, request.getRequestURI().myUnits
* response.getBufferSize().bytes, response.getBufferSize().bytes.value
*
* @param label
*/
HttpMonItem(String label, HttpMonFactory httpMonFactory) {
parseLabel(label, httpMonFactory);
}
// parse passed in string and build HttpMonItems from it to be used to monitor
// The request. Note general form is request or response followed by a method name and units. Special defined tokes are value, contextpath, url and units
private void parseLabel(String localLabel, HttpMonFactory httpMonFactory) {
String colAlias=colAlias(localLabel); // brings back anything after 'as', if it exists, null otherwise: request.getMethod().bytes as ColName
String nonAlias=nonAlias(localLabel); // brings back what is before 'as alias'. i.e. request.getMethod().bytes
String[] parsedLabel=nonAlias.split("[.]");
label=httpMonFactory.getLabelPrefix()+".response.";// default label
for (int i=0;i 0) then don't create a monitor.
// if the monitor already exists then you can proceed as no more monitors will be created.
return MonitorFactory.getNumRows()>httpMonBase.getSize() && httpMonBase.getSize()>0 && !MonitorFactory.exists(getMonKey(httpMonBase));
}
// Track anytime the monitor threshold has been exceeded.
private void createSizeThresholdExceededMon(HttpMonRequest httpMonBase) {
String label=new StringBuffer(httpMonBase.getLabelPrefix()).append(".HttpMonFactory.sizeExceeded.").append(httpMonBase.getSize()).toString();
String detailLabel=new StringBuffer(getLabel(httpMonBase)).append(", ").append(httpMonBase.getRequestURI()).append(", ").append(getUnits()).toString();
MonitorFactory.add(new MonKeyImp(label, detailLabel, "Count"), httpMonBase.getSize());
}
// return key. note we are passing in details that can be used in the detail buffer. Details consist of the uri as well as a stack trace
// if one occured.
MonKey getMonKey(HttpMonRequest httpMonBase) {
return new MonKeyImp(getLabel(httpMonBase), httpMonBase.getDetailLabel(), getUnits());
}
/** If a value label is to be used then append it to the end of the label, else just return the label. The results will be used to create
* a jamon record. Ex: request.getMethod() or request.getMethod().post
* @return
*/
String getLabel(HttpMonRequest httpMonBase) {
if ("".equals(additionToLabel))
return label;
// add value and/or url if they are required in the label.
StringBuffer sb=new StringBuffer(label);
if ( !(label.charAt(label.length()-1)=='.'))// in some cases if this isn't done then the label has no dots, or 2 consecutive ones.
sb.append(".");
for (int i=0;i=1)// i.e. both u and v are specified
sb.append(", ");
if (additionToLabel.charAt(i)=='v')//value
sb.append("value: ").append(getValueLabel(httpMonBase));
else if (additionToLabel.charAt(i)=='u')//url
sb.append("url: ").append(httpMonBase.getKeyReadyURI());
else if (additionToLabel.charAt(i)=='p')//path
sb.append("contextpath: ").append(httpMonBase.getContextPath());
}
return sb.toString();
}
/** Used to create a jamon label like request.getMethod().post */
Object getValueLabel(HttpMonRequest httpMonBase) {
Object valLabel=executeMethod(httpMonBase);
if (removeHttpParams)
valLabel=removeHttpParams(valLabel);
return valLabel;
}
/* Return value to be added to jamon. Note this is not called when it is a time monitor. If the object returned is a number
* then add that value to jamon else just add the number 1. */
double getValueToAdd(HttpMonRequest httpMonBase) {
Object obj=executeMethod(httpMonBase);
if (obj instanceof Number)
return ((Number)obj).doubleValue();
else
return 1.0;
}
// Execute the request or responses method.
private Object executeMethod(HttpMonRequest httpMonBase) {
Object retValue=null;
try {
retValue = getMethod(httpMonBase).invoke(getObjectToExecute(httpMonBase), (Object[])null);// null is noargs.
} catch (Throwable e) {// note I don't want the program to abort due to monitoring so the exception is not being passed upstream
MonitorFactory.add(new MonKeyImp(httpMonBase.getLabelPrefix()+".monError", new Object[]{this, Misc.getExceptionTrace(e)}, "Exception"),1);
}
return retValue;
}
// return method that we are getting monitoring info from.
Method getMethod(HttpMonRequest httpMonBase) {
try {
if (method==null)
method = getObjectToExecute(httpMonBase).getClass().getMethod(methodName, (Class[])null);
} catch (NoSuchMethodException e) {
}
return method;
}
// get the object we are calling the monitoring method from
Object getObjectToExecute(HttpMonRequest httpMonBase) {
if (isResponse())
return httpMonBase.getResponse();
else
return httpMonBase.getRequest();
}
@Override
public String toString() {
return new StringBuffer("label=").append(label).append(", units=").append(units).append(", methodName=").append(methodName).toString();
}
/** get alias portion of 'request.getRequestURI() AS myAlias.
* this is used to put a more descriptive name in jamon.
* @VisibleForTesting
*/
protected static String colAlias(String str) {
if (str==null)
return null;
String[] arr=str.split(" [aA][sS] ");
if (arr.length==2) // returns pageHits when 'request.getRequestURI() as pageHits' is passed
return arr[1].trim();
else
return null; // returns request.getRequestURI() (no alias was used)
}
/** return nonalias portion of string.
* @VisibleForTesting
*/
protected static String nonAlias(String str) {
if (str==null)
return null;
String[] arr=str.split(" [aA][sS] ");
return arr[0].trim(); // returns request.getRequestURI() (no alias was used)
}
/** passing this: http://www.mypage.com:8080/page;jsessionid=5akalsdjfflj;other=9s0f0udsf?pageName=my.jsp
* would return this: http://www.mypage.com:8080/page used to remove jsessionid from page hits.
* @VisibleForTesting
* @param url
* @return
*/
protected static String removeHttpParams(Object url) {
if (url==null)
return null;
String urlStr=url.toString();
int paramIndex = urlStr.indexOf(";");
if (paramIndex == -1)// ; isn't in string
return urlStr;
else
return urlStr.substring(0, paramIndex);
}
}
