nl.surfnet.coin.shared.filter
Class LoggingFilter

java.lang.Object
  nl.surfnet.coin.shared.filter.LoggingFilter

All Implemented Interfaces:

javax.servlet.Filter

public class LoggingFilter
extends Object
implements javax.servlet.Filter

Filter that grabs relevant request and response data and log it using the regular logger. Two logging categories are defined and used, not named after the class but 'request' and 'response'. At DEBUG level, the complete request URL, including query string, is logged, together with the response's status line. At TRACE level, the request headers, and the complete response body are logged as well. For correlation of request/response, a unique request ID is generated per request and is logged.

Nested Class Summary

static class

LoggingFilter.MemorizingResponseWrapper Response wrapper that keeps the response for logging, as well as the HTTP status.

Field Summary

static String	OUTPUT_STREAM_COPY_ATTR
static String	REQUEST_ID_ATTR

Constructor Summary

LoggingFilter()

Method Summary

void	destroy()
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)
protected String	generateRequestId() Create a request id.
void	init(javax.servlet.FilterConfig filterConfig)

Methods inherited from class java.lang.Object

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

Field Detail

REQUEST_ID_ATTR

public static final String REQUEST_ID_ATTR

See Also:

Constant Field Values

OUTPUT_STREAM_COPY_ATTR

public static final String OUTPUT_STREAM_COPY_ATTR

See Also:

Constant Field Values

Constructor Detail

LoggingFilter

public LoggingFilter()

Method Detail

init

public void init(javax.servlet.FilterConfig filterConfig)
          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

generateRequestId

protected String generateRequestId()

Create a request id. Calls to it are synchronized externally, so the implementation does not have to be thread safe.

Returns:

unique string

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Filter