Package com.devonfw.module.logging.common.impl

Class PerformanceLogFilter

java.lang.Object

com.devonfw.module.logging.common.impl.PerformanceLogFilter

All Implemented Interfaces:

javax.servlet.Filter

public class PerformanceLogFilter
extends Object
implements javax.servlet.Filter

Request logging filter that measures the execution time of a request.

Since:

1.5.0

Field Summary

Fields

Modifier and Type	Field	Description
private static org.slf4j.Logger	LOG
private String	urlFilter	Optional filter to only measure execution time of requests that match the filter.

Constructor Summary

Constructors

Constructor	Description
PerformanceLogFilter()	The constructor.

Method Summary

Modifier and Type	Method	Description
private String	createMessage(String... args)	Returns a String representing the log message, which contains the given arguments separated by ';'
void	destroy()
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)
void	init(javax.servlet.FilterConfig config)
private void	logPerformance(javax.servlet.ServletResponse response, long startTime, String url, Throwable error)	Logs the request URL, execution time and HttpStatus.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

private static final org.slf4j.Logger LOG

urlFilter

private String urlFilter

Optional filter to only measure execution time of requests that match the filter.

Constructor Detail

PerformanceLogFilter

public PerformanceLogFilter()

The constructor.

Method Detail

init

public void init(javax.servlet.FilterConfig config)
          throws javax.servlet.ServletException

Specified by:

init in interface javax.servlet.Filter

Throws:

javax.servlet.ServletException

doFilter

public void doFilter(javax.servlet.ServletRequest request,
                     javax.servlet.ServletResponse response,
                     javax.servlet.FilterChain chain)
              throws IOException,
                     javax.servlet.ServletException

Specified by:

doFilter in interface javax.servlet.Filter

Throws:

IOException

javax.servlet.ServletException

logPerformance

private void logPerformance(javax.servlet.ServletResponse response,
                            long startTime,
                            String url,
                            Throwable error)

Logs the request URL, execution time and HttpStatus. In case of an error also logs class name and error message.

Parameters:

response - - the ServletResponse

startTime - - start time of the doFilter(ServletRequest, ServletResponse, FilterChain) function

url - - requested URL

error - - error thrown by the requested servlet, null if execution did not cause an error

createMessage

private String createMessage(String... args)

Returns a String representing the log message, which contains the given arguments separated by ';'

Parameters:

args - - the arguments for the log message

Returns:

a String representing the log message

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Filter