org.apache.catalina.valves
Class ExtendedAccessLogValve

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

public final class ExtendedAccessLogValve
extends ValveBase
implements Lifecycle

An implementation of the W3c Extended Log File Format. See http://www.w3.org/TR/WD-logfile.html for more information about the format. The following fields are supported:

Log rotation can be on or off. This is dictated by the rotatable property.

For UNIX users, another field called checkExistsis also available. If set to true, the log file's existence will be checked before each logging. This way an external log rotator can move the file somewhere and tomcat will start with a new file.

For JMX junkies, a public method called rotate has been made available to allow you to tell this instance to move the existing log file to somewhere else start writing a new log file.

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.

For extended attributes coming from a getAttribute() call, it is you responsibility to ensure there are no newline or control characters.

Version:
$Revision: 1.4 $ $Date: 2004/08/26 21:43:51 $
Author:
Tim Funk

Field Summary
protected static java.lang.String info
          The descriptive information about this implementation.
protected  LifecycleSupport lifecycle
          The lifecycle event support for this component.
 
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
ExtendedAccessLogValve()
          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.
 org.apache.catalina.valves.FieldInfo[] decodePattern(java.lang.String fields)
          Decode the given pattern.
 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 isCheckExists()
          Check for file existence before logging.
 boolean isRotatable()
          Return true if logs are automatically rotated.
 void removeLifecycleListener(LifecycleListener listener)
          Remove a lifecycle event listener from this component.
 boolean rotate(java.lang.String newFileName)
          Rename the existing log file to something else.
 void setCheckExists(boolean checkExists)
          Set whether to check for log file existence before logging.
 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 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.

Constructor Detail

ExtendedAccessLogValve

public ExtendedAccessLogValve()
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 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()
Return true if logs are automatically rotated.


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

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

isCheckExists

public boolean isCheckExists()
Check for file existence before logging.


setCheckExists

public void setCheckExists(boolean checkExists)
Set whether to check for log file existence before logging.

Parameters:
checkExists - true meaning to check for file existence.

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

rotate

public boolean rotate(java.lang.String newFileName)
Rename the existing log file to something else. Then open the old log file name up once again. Intended to be called by a JMX agent.

Parameters:
newFileName - The file name to move the log file entry to
Returns:
true if a file was rotated with no error

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

decodePattern

public org.apache.catalina.valves.FieldInfo[] decodePattern(java.lang.String fields)
Decode the given pattern. Is public so a pattern may allows to be validated.

Parameters:
fields - The pattern to decode
Returns:
null on error. Otherwise array of decoded fields


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