Wicket SeverAndClientTimeFilter

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package wicket.markup.html;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import wicket.Application;
import wicket.IResponseFilter;
import wicket.RequestCycle;
import wicket.Session;
import wicket.model.Model;
import wicket.util.string.AppendingStringBuffer;
import wicket.util.string.JavascriptUtils;

/**
* This is a filter that injects javascript code to the top head portion and
* after the body so that the time can me measured what the client parse time
* was for this page. It also reports the total server parse/response time in
* the client and logs the server response time and response size it took for a
* specific response in the server log.
*
* You can specify what the status text should be like this:
* ServerAndClientTimeFilter.statustext=My Application, Server parsetime:
* ${servertime}, Client parsetime: ${clienttime}
* likewise for ajax request use ajax.ServerAndClientTimeFilter.statustext
*
* @author jcompagner
*/
public class ServerAndClientTimeFilter implements IResponseFilter
{
private static Log log = LogFactory.getLog(ServerAndClientTimeFilter.class);

/**
* @see wicket.IResponseFilter#filter(java.lang.StringBuffer)
*/
public AppendingStringBuffer filter(AppendingStringBuffer responseBuffer)
{
int headIndex = responseBuffer.indexOf("<head>");
int bodyIndex = responseBuffer.indexOf("</body>");
int ajaxStart=responseBuffer.indexOf("<ajax-response>");
int ajaxEnd=responseBuffer.indexOf("</ajax-response>");
long timeTaken = System.currentTimeMillis() -
RequestCycle.get().getStartTime();
if(headIndex != -1 && bodyIndex != -1)
{
AppendingStringBuffer endScript = new AppendingStringBuffer(150);
endScript.append("\n").append(JavascriptUtils.SCRIPT_OPEN_TAG);
endScript.append("\nwindow.defaultStatus='");
endScript.append(getStatusString(timeTaken,
"ServerAndClientTimeFilter.statustext"));
endScript.append("';\n").append(JavascriptUtils.SCRIPT_CLOSE_TAG).append("\n");
responseBuffer.insert(bodyIndex - 1, endScript);
responseBuffer.insert(headIndex + 6, "\n" + JavascriptUtils.SCRIPT_OPEN_TAG
+ "\nvar clientTimeVariable = new Date().getTime();\n"
+ JavascriptUtils.SCRIPT_CLOSE_TAG + "\n");
}
else if(ajaxStart !=-1 && ajaxEnd!=-1)
{
AppendingStringBuffer startScript = new AppendingStringBuffer(250);
startScript.append("<evaluate><![CDATA[window.defaultStatus='");
startScript.append(getStatusString(timeTaken,
"ajax.ServerAndClientTimeFilter.statustext"));
startScript.append("';]]></evaluate>");
responseBuffer.insert(ajaxEnd,startScript.toString());
responseBuffer.insert(ajaxStart+15,
"<evaluate><![CDATA[clientTimeVariable = new
Date().getTime();]]></evaluate>");
}
log.info( timeTaken + "ms server time taken for request " +
RequestCycle.get().getRequest().getURL() + " response size: " +
responseBuffer.length());
return responseBuffer;
}

/**
* Returns a locale specific status message about the server and client time.
* @param timeTaken the server time it took
* @param resourceKey The key for the locale specific string lookup
* @return String with the status message
*/
private String getStatusString(long timeTaken, String resourceKey)
{
Map<String,String> map = new HashMap<String,String>(4);
map.put("clienttime", "' + (new Date().getTime() -
clientTimeVariable)/1000 + 's");
map.put("servertime", ((double)timeTaken) / 1000 + "s");
AppendingStringBuffer defaultValue = new AppendingStringBuffer(128);
defaultValue.append("Server parsetime: ");
defaultValue.append(((double)timeTaken) / 1000);
defaultValue
.append("s, Client parsetime: ' + (new Date().getTime() -
clientTimeVariable)/1000 + 's");
String txt = Application.get().getResourceSettings().getLocalizer().getString(
resourceKey, null, Model.valueOf(map),
Session.get().getLocale(), Session.get().getStyle(),
defaultValue.toString());
return txt;
}

}