org.apache.catalina.valves
Class AccessLogValve

java.lang.Object
  extended byorg.apache.catalina.valves.ValveBase
      extended byorg.apache.catalina.valves.AccessLogValve
All Implemented Interfaces:
Contained, Lifecycle, Valve

public final class AccessLogValve
extends ValveBase
implements Lifecycle

Implementation of the Valve interface that generates a web server access log with the detailed line contents matching a configurable pattern. The syntax of the available patterns is similar to that supported by the Apache mod_log_config module. As an additional feature, automatic rollover of log files when the date changes is also supported.

Patterns for the logged message may include constant text or any of the following replacement strings, for which the corresponding information from the specified Response is substituted:

In addition, the caller can specify one of the following aliases for commonly utilized patterns:

There is also support to write information from the cookie, incoming header, the Session or something else in the ServletRequest.
It is modeled after the apache syntax:

Conditional logging is also supported. This can be done with the condition property. If the value returned from ServletRequest.getAttribute(condition) yields a non-null value. The logging will be skipped.

Version:
$Revision: 1.18 $ $Date: 2004/08/26 21:43:51 $
Author:
Craig R. McClanahan, Jason Brittain

Field Summary
protected static java.lang.String info
          The descriptive information about this implementation.
protected  LifecycleSupport lifecycle
          The lifecycle event support for this component.
protected static java.lang.String[] months
          The set of month abbreviations for log messages.
 
Fields inherited from class org.apache.catalina.valves.ValveBase
container, debug
 
Fields inherited from interface org.apache.catalina.Lifecycle
AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, START_EVENT, STOP_EVENT
 
Constructor Summary
AccessLogValve()
          Construct a new instance of this class with default property values.
 
Method Summary
 void addLifecycleListener(LifecycleListener listener)
          Add a lifecycle event listener to this component.
 LifecycleListener[] findLifecycleListeners()
          Get the lifecycle listeners associated with this lifecycle.
 java.lang.String getCondition()
          Return whether the attribute name to look for when performing conditional loggging.
 java.lang.String getDirectory()
          Return the directory in which we create log files.
 java.lang.String getFileDateFormat()
          Return the date format date based log rotation.
 java.lang.String getInfo()
          Return descriptive information about this implementation.
 java.lang.String getPattern()
          Return the format pattern.
 java.lang.String getPrefix()
          Return the log file prefix.
 java.lang.String getSuffix()
          Return the log file suffix.
 void invoke(Request request, Response response, ValveContext context)
          Log a message summarizing the specified request and response, according to the format specified by the pattern property.
 boolean isResolveHosts()
          Get the value of the resolve hosts flag.
 boolean isRotatable()
          Should we rotate the logs
 void log(java.lang.String message, java.util.Date date)
          Log the specified message to the log file, switching files if the date has changed since the previous log call.
 void removeLifecycleListener(LifecycleListener listener)
          Remove a lifecycle event listener from this component.
 void setCondition(java.lang.String condition)
          Set the ServletRequest.attribute to look for to perform conditional logging.
 void setDirectory(java.lang.String directory)
          Set the directory in which we create log files.
 void setFileDateFormat(java.lang.String fileDateFormat)
          Set the date format date based log rotation.
 void setPattern(java.lang.String pattern)
          Set the format pattern, first translating any recognized alias.
 void setPrefix(java.lang.String prefix)
          Set the log file prefix.
 void setResolveHosts(boolean resolveHosts)
          Set the resolve hosts flag.
 void setRotatable(boolean rotatable)
          Set the value is we should we rotate the logs
 void setSuffix(java.lang.String suffix)
          Set the log file suffix.
 void start()
          Prepare for the beginning of active use of the public methods of this component.
 void stop()
          Gracefully terminate the active use of the public methods of this component.
 
Methods inherited from class org.apache.catalina.valves.ValveBase
getContainer, getDebug, setContainer, setDebug
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

info

protected static final java.lang.String info
The descriptive information about this implementation.

See Also:
Constant Field Values

lifecycle

protected LifecycleSupport lifecycle
The lifecycle event support for this component.


months

protected static final java.lang.String[] months
The set of month abbreviations for log messages.

Constructor Detail

AccessLogValve

public AccessLogValve()
Construct a new instance of this class with default property values.

Method Detail

getDirectory

public java.lang.String getDirectory()
Return the directory in which we create log files.


setDirectory

public void setDirectory(java.lang.String directory)
Set the directory in which we create log files.

Parameters:
directory - The new log file directory

getInfo

public java.lang.String getInfo()
Return descriptive information about this implementation.

Specified by:
getInfo in interface Valve
Overrides:
getInfo in class ValveBase

getPattern

public java.lang.String getPattern()
Return the format pattern.


setPattern

public void setPattern(java.lang.String pattern)
Set the format pattern, first translating any recognized alias.

Parameters:
pattern - The new pattern

getPrefix

public java.lang.String getPrefix()
Return the log file prefix.


setPrefix

public void setPrefix(java.lang.String prefix)
Set the log file prefix.

Parameters:
prefix - The new log file prefix

isRotatable

public boolean isRotatable()
Should we rotate the logs


setRotatable

public void setRotatable(boolean rotatable)
Set the value is we should we rotate the logs

Parameters:
rotatable - true is we should rotate.

getSuffix

public java.lang.String getSuffix()
Return the log file suffix.


setSuffix

public void setSuffix(java.lang.String suffix)
Set the log file suffix.

Parameters:
suffix - The new log file suffix

setResolveHosts

public void setResolveHosts(boolean resolveHosts)
Set the resolve hosts flag.

Parameters:
resolveHosts - The new resolve hosts value

isResolveHosts

public boolean isResolveHosts()
Get the value of the resolve hosts flag.


getCondition

public java.lang.String getCondition()
Return whether the attribute name to look for when performing conditional loggging. If null, every request is logged.


setCondition

public void setCondition(java.lang.String condition)
Set the ServletRequest.attribute to look for to perform conditional logging. Set to null to log everything.

Parameters:
condition - Set to null to log everything

getFileDateFormat

public java.lang.String getFileDateFormat()
Return the date format date based log rotation.


setFileDateFormat

public void setFileDateFormat(java.lang.String fileDateFormat)
Set the date format date based log rotation.


invoke

public void invoke(Request request,
                   Response response,
                   ValveContext context)
            throws java.io.IOException,
                   javax.servlet.ServletException
Log a message summarizing the specified request and response, according to the format specified by the pattern property.

Specified by:
invoke in interface Valve
Specified by:
invoke in class ValveBase
Parameters:
request - Request being processed
response - Response being processed
context - The valve context used to invoke the next valve in the current processing pipeline
Throws:
java.io.IOException - if an input/output error has occurred
javax.servlet.ServletException - if a servlet error has occurred

log

public void log(java.lang.String message,
                java.util.Date date)
Log the specified message to the log file, switching files if the date has changed since the previous log call.

Parameters:
message - Message to be logged
date - the current Date object (so this method doesn't need to create a new one)

addLifecycleListener

public void addLifecycleListener(LifecycleListener listener)
Add a lifecycle event listener to this component.

Specified by:
addLifecycleListener in interface Lifecycle
Parameters:
listener - The listener to add

findLifecycleListeners

public LifecycleListener[] findLifecycleListeners()
Get the lifecycle listeners associated with this lifecycle. If this Lifecycle has no listeners registered, a zero-length array is returned.

Specified by:
findLifecycleListeners in interface Lifecycle

removeLifecycleListener

public void removeLifecycleListener(LifecycleListener listener)
Remove a lifecycle event listener from this component.

Specified by:
removeLifecycleListener in interface Lifecycle
Parameters:
listener - The listener to add

start

public void start()
           throws LifecycleException
Prepare for the beginning of active use of the public methods of this component. This method should be called after configure(), and before any of the public methods of the component are utilized.

Specified by:
start in interface Lifecycle
Throws:
LifecycleException - if this component detects a fatal error that prevents this component from being used

stop

public void stop()
          throws LifecycleException
Gracefully terminate the active use of the public methods of this component. This method should be the last one called on a given instance of this component.

Specified by:
stop in interface Lifecycle
Throws:
LifecycleException - if this component detects a fatal error that needs to be reported


Copyright 2000-2002 Apache Software Foundation. All Rights Reserved.