AccessLogFilter

java.lang.Object
- com.sodius.oslc.server.services.HttpFilter
- - com.sodius.oslc.server.services.AccessLogFilter

All Implemented Interfaces:

Filter
```
public class AccessLogFilter
extends HttpFilter
```
Logs all servlet requests and their responses.
For each servlet request, this filter logs:
- the request URI (including its query parameters),
- the request headers (see below for header configuration),
- the response HTTP status,
- the response headers (see below for header configuration),
- the execution time to produce the response
A logged request looks like the following:
```
 2018-12-10 10:20:37,112 [qtp252455605-43] DEBUG com.sodius.oslc.server.services.AccessLogFilter - "GET /app/web/index.html" 200 541
 
```
The logging level used is DEBUG. Logging is activated either by setting the root level to DEBUG or specifically for this class using following Log4J configuration:
```
 log4j.logger.com.sodius.oslc.server.services.AccessLogFilter = DEBUG
 
```
This filter does not log any request nor response header by default. A "oslc.accessLog.headers" context parameter can be used to indicate the request and response headers to log. Header names are comma-separated in this parameter. The context parameter can be set using a Java system property:
```
 -Doslc.accessLog.headers=Accept,Content-Type
 
```
which logs the following:
```
 2018-12-10 10:20:37,112 [qtp252455605-43] DEBUG com.sodius.oslc.server.services.AccessLogFilter - "GET /app/web/index.html" [Accept="text/html"] HTTP 200 [Content-Type="text/html;charset=UTF-8"] 541ms
 
```
Since:

1.4.0

Constructor Summary

Constructors
Constructor Description

AccessLogFilter()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain)`	Processes this filter and either executes or blocks the chain.
`void`	`init(FilterConfig config)`	This implementation does nothing.

Methods inherited from class com.sodius.oslc.server.services.HttpFilter
destroy, doFilter, handleOslcError

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AccessLogFilter
```
public AccessLogFilter()
```
- Method Detail
  - init
```
public void init(FilterConfig config)
          throws ServletException
```
    Description copied from class: HttpFilter
    
    This implementation does nothing. Subclasses may override.
    
    Specified by:
    
    init in interface Filter
    
    Overrides:
    
    init in class HttpFilter
    
    Parameters:
    
    config - the configuration of the filter.
    
    Throws:
    
    ServletException - not thrown by this implementation.
  - doFilter
```
protected void doFilter(HttpServletRequest request,
                        HttpServletResponse response,
                        FilterChain chain)
                 throws IOException,
                        ServletException
```
    Description copied from class: HttpFilter
    
    Processes this filter and either executes or blocks the chain.
    Subclasses may throw a OslcWebApplicationException to report an OslcError. This filter will automatically serialize such error in the HTTP response.
    
    Specified by:
    
    doFilter in class HttpFilter
    
    Parameters:
    
    request - the request.
    
    response - the response.
    
    chain - the filter chain to process.
    
    Throws:
    
    IOException - if an I/O error occurs.
    
    ServletException - if the filter execution fails.