org.apache.catalina.valves

## Class AccessLogValve

- java.lang.Object
- - org.apache.catalina.util.LifecycleBase
  - - org.apache.catalina.util.LifecycleMBeanBase
    - - org.apache.catalina.valves.ValveBase
      - - org.apache.catalina.valves.AccessLogValve

- All Implemented Interfaces:
    MBeanRegistration, AccessLog, Contained, Lifecycle, Valve
  Direct Known Subclasses:
    ExtendedAccessLogValve

      public class AccessLogValve
      extends ValveBase
      implements AccessLog

  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 HTTP Server `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:

  - %a - Remote IP address
  - %A - Local IP address
  - %b - Bytes sent, excluding HTTP headers, or '-' if no bytes were sent
  - %B - Bytes sent, excluding HTTP headers
  - %h - Remote host name (or IP address if `enableLookups` for the connector is false)
  - %H - Request protocol
  - %l - Remote logical username from identd (always returns '-')
  - %m - Request method
  - %p - Local port
  - %q - Query string (prepended with a '?' if it exists, otherwise an empty string
  - %r - First line of the request
  - %s - HTTP status code of the response
  - %S - User session ID
  - %t - Date and time, in Common Log Format format
  - %u - Remote user that was authenticated
  - %U - Requested URL path
  - %v - Local server name
  - %D - Time taken to process the request, in millis
  - %T - Time taken to process the request, in seconds
  - %I - current Request thread name (can compare later with stacktraces)

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

  - common - `%h %l %u %t "%r" %s %b`
  - combined - `%h %l %u %t "%r" %s %b "%{Referer}i" "%{User-Agent}i"`

  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 HTTP Server log configuration syntax:

  - `%{xxx}i` for incoming headers
  - `%{xxx}o` for outgoing response headers
  - `%{xxx}c` for a specific cookie
  - `%{xxx}r` xxx is an attribute in the ServletRequest
  - `%{xxx}s` xxx is an attribute in the HttpSession
  - `%{xxx}t` xxx is an enhanced SimpleDateFormat pattern (see Configuration Reference document for details on supported time patterns)

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

  For UNIX users, another field called `checkExists` is 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 and start writing a new log file.

  Conditional logging is also supported. This can be done with the `conditionUnless` and `conditionIf` properties. If the value returned from ServletRequest.getAttribute(conditionUnless) yields a non-null value, the logging will be skipped. If the value returned from ServletRequest.getAttribute(conditionIf) yields the null value, the logging will be skipped. The `condition` attribute is synonym for `conditionUnless` and is provided for backwards compatibility.

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

  Author:
    Craig R. McClanahan, Jason Brittain, Remy Maucherat, Takayuki Kaneko, Peter Rossbach

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected static interface` | `AccessLogValve.AccessLogElement` AccessLogElement writes the partial message into the buffer.
    `protected static class` | `AccessLogValve.ByteSentElement` write bytes sent, excluding HTTP headers - %b, %B
    `protected static class` | `AccessLogValve.CookieElement` write a specific cookie - %{xxx}c
    `protected class` | `AccessLogValve.DateAndTimeElement` write date and time, in configurable format (default CLF) - %t or %{format}t
    `protected static class` | `AccessLogValve.DateFormatCache` Cache structure for formatted timestamps based on seconds.
    `protected static class` | `AccessLogValve.ElapsedTimeElement` write time taken to process the request - %D, %T
    `protected static class` | `AccessLogValve.FirstByteTimeElement` write time until first byte is written (commit time) in millis - %F
    `protected static class` | `AccessLogValve.HeaderElement` write incoming headers - %{xxx}i
    `protected class` | `AccessLogValve.HostElement` write remote host name - %h
    `protected static class` | `AccessLogValve.HttpStatusCodeElement` write HTTP status code of the response - %s
    `protected static class` | `AccessLogValve.LocalAddrElement` write local IP address - %A
    `protected static class` | `AccessLogValve.LocalServerNameElement` write local server name - %v
    `protected static class` | `AccessLogValve.LogicalUserNameElement` write remote logical username from identd (always returns '-') - %l
    `protected static class` | `AccessLogValve.MethodElement` write request method (GET, POST, etc.) - %m
    `protected class` | `AccessLogValve.PortElement` write local or remote port for request connection - %p and %{xxx}p
    `protected class` | `AccessLogValve.ProtocolElement` write request protocol - %H
    `protected static class` | `AccessLogValve.QueryElement` write Query string (prepended with a '?'
    `protected class` | `AccessLogValve.RemoteAddrElement` write remote IP address - %a
    `protected static class` | `AccessLogValve.RequestAttributeElement` write an attribute in the ServletRequest - %{xxx}r
    `protected static class` | `AccessLogValve.RequestElement` write first line of the request (method and request URI) - %r
    `protected static class` | `AccessLogValve.RequestURIElement` write requested URL path - %U
    `protected static class` | `AccessLogValve.ResponseHeaderElement` write a specific response header - %{xxx}o
    `protected static class` | `AccessLogValve.SessionAttributeElement` write an attribute in the HttpSession - %{xxx}s
    `protected static class` | `AccessLogValve.SessionIdElement` write user session ID - %S
    `protected static class` | `AccessLogValve.StringElement` write any string
    `protected static class` | `AccessLogValve.ThreadNameElement` write thread name - %I
    `protected static class` | `AccessLogValve.UserElement` write remote user that was authenticated (if any), else '-' - %u

    - ### Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle

      `Lifecycle.SingleUse`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `condition` Are we doing conditional logging. default null.
    `protected String` | `conditionIf` Are we doing conditional logging. default null.
    `protected File` | `currentLogFile` The current log file we are writing to.
    `protected boolean` | `enabled` enabled this component
    `protected String` | `encoding` Character set used by the log file.
    `protected String` | `fileDateFormat` Date format to place in log file name.
    `protected SimpleDateFormat` | `fileDateFormatter` A date formatter to format a Date using the format given by `fileDateFormat`.
    `protected static String` | `info` The descriptive information about this implementation.
    `protected Locale` | `locale` Locale used to format timestamps in log entries and in log file name suffix.
    `protected String` | `localeName` Name of locale used to format timestamps in log entries and in log file name suffix.
    `protected AccessLogValve.AccessLogElement[]` | `logElements` Array of AccessLogElement, they will be used to make log message.
    `protected String` | `pattern` The pattern used to format our access log lines.
    `protected String` | `prefix` The prefix that is added to log file filenames.
    `protected boolean` | `renameOnRotate` Should we defer inclusion of the date stamp in the file name until rotate time?
    `protected boolean` | `requestAttributesEnabled` Should this valve set request attributes for IP address, hostname, protocol and port used for the request.
    `protected boolean` | `rotatable` Should we rotate our log file?
    `protected String` | `suffix` The suffix that is added to log file filenames.
    `protected PrintWriter` | `writer` The PrintWriter to which we are currently logging, if any.

    - ### Fields inherited from class org.apache.catalina.valves.ValveBase

      `asyncSupported, container, containerLog, next, sm`

    - ### Fields inherited from class org.apache.catalina.util.LifecycleMBeanBase

      `mserver`

    - ### Fields inherited from interface org.apache.catalina.AccessLog

      `PROTOCOL_ATTRIBUTE, REMOTE_ADDR_ATTRIBUTE, REMOTE_HOST_ATTRIBUTE, SERVER_PORT_ATTRIBUTE`

    - ### Fields inherited from interface org.apache.catalina.Lifecycle

      `AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AccessLogValve()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `backgroundProcess()` Execute a periodic task, such as reloading, etc.
    `protected AccessLogValve.AccessLogElement` | `createAccessLogElement(char pattern)` create an AccessLogElement implementation
    `protected AccessLogValve.AccessLogElement` | `createAccessLogElement(String name, char pattern)` create an AccessLogElement implementation which needs an element name
    `protected AccessLogValve.AccessLogElement[]` | `createLogElements()` parse pattern string and create the array of AccessLogElement
    `protected static Locale` | `findLocale(String name, Locale fallback)` Find a locale by name
    `String` | `getCondition()` Return whether the attribute name to look for when performing conditional logging.
    `String` | `getConditionIf()` Return whether the attribute name to look for when performing conditional logging.
    `String` | `getConditionUnless()` Return whether the attribute name to look for when performing conditional logging.
    `String` | `getDirectory()` Return the directory in which we create log files.
    `boolean` | `getEnabled()`
    `String` | `getEncoding()` Return the character set name that is used to write the log file.
    `String` | `getFileDateFormat()` Return the date format date based log rotation.
    `String` | `getInfo()` Return descriptive information about this implementation.
    `String` | `getLocale()` Return the locale used to format timestamps in log entries and in log file name suffix.
    `String` | `getPattern()` Return the format pattern.
    `String` | `getPrefix()` Return the log file prefix.
    `boolean` | `getRequestAttributesEnabled()`
    `String` | `getSuffix()` Return the log file suffix.
    `void` | `invoke(Request request, Response response)` Log a message summarizing the specified request and response, according to the format specified by the `pattern` property.
    `boolean` | `isBuffered()` Is the logging buffered
    `boolean` | `isCheckExists()` Check for file existence before logging.
    `boolean` | `isRenameOnRotate()` Should we defer inclusion of the date stamp in the file name until rotate time
    `boolean` | `isResolveHosts()` Deprecated. Unused, removed in Tomcat 8. See org.apache.catalina.connector.Connector.setEnableLookups(boolean).
    `boolean` | `isRotatable()` Should we rotate the access log.
    `void` | `log(Request request, Response response, long time)` Add the request/response to the access log using the specified processing time.
    `void` | `log(String message)` Log the specified message to the log file, switching files if the date has changed since the previous log call.
    `protected void` | `open()` Open the new log file for the date specified by `dateStamp`.
    `void` | `rotate()` Rotate the log file if necessary.
    `boolean` | `rotate(String newFileName)` Rename the existing log file to something else.
    `void` | `setBuffered(boolean buffered)` Set the value if the logging should be buffered
    `void` | `setCheckExists(boolean checkExists)` Set whether to check for log file existence before logging.
    `void` | `setCondition(String condition)` Set the ServletRequest.attribute to look for to perform conditional logging.
    `void` | `setConditionIf(String condition)` Set the ServletRequest.attribute to look for to perform conditional logging.
    `void` | `setConditionUnless(String condition)` Set the ServletRequest.attribute to look for to perform conditional logging.
    `void` | `setDirectory(String directory)` Set the directory in which we create log files.
    `void` | `setEnabled(boolean enabled)`
    `void` | `setEncoding(String encoding)` Set the character set that is used to write the log file.
    `void` | `setFileDateFormat(String fileDateFormat)` Set the date format date based log rotation.
    `void` | `setLocale(String localeName)` Set the locale used to format timestamps in log entries and in log file name suffix.
    `void` | `setPattern(String pattern)` Set the format pattern, first translating any recognized alias.
    `void` | `setPrefix(String prefix)` Set the log file prefix.
    `void` | `setRenameOnRotate(boolean renameOnRotate)` Set the value if we should defer inclusion of the date stamp in the file name until rotate time
    `void` | `setRequestAttributesEnabled(boolean requestAttributesEnabled)` Should this valve set request attributes for IP address, hostname, protocol and port used for the request?
    `void` | `setResolveHosts(boolean resolveHosts)` Deprecated. Unused, removed in Tomcat 8. See org.apache.catalina.connector.Connector.setEnableLookups(boolean).
    `void` | `setRotatable(boolean rotatable)` Configure whether the access log should be rotated.
    `void` | `setSuffix(String suffix)` Set the log file suffix.
    `protected void` | `startInternal()` Start this component and implement the requirements of `LifecycleBase.startInternal()`.
    `protected void` | `stopInternal()` Stop this component and implement the requirements of `LifecycleBase.stopInternal()`.

    - ### Methods inherited from class org.apache.catalina.valves.ValveBase

      `event, getContainer, getDomainInternal, getNext, getObjectNameKeyProperties, initInternal, isAsyncSupported, setAsyncSupported, setContainer, setNext, toString`

    - ### Methods inherited from class org.apache.catalina.util.LifecycleMBeanBase

      `destroyInternal, getDomain, getObjectName, postDeregister, postRegister, preDeregister, preRegister, register, setDomain, unregister`

    - ### Methods inherited from class org.apache.catalina.util.LifecycleBase

      `addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, init, removeLifecycleListener, setState, setState, start, stop`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### info

          protected static final String info

      The descriptive information about this implementation.
      See Also:
        Constant Field Values

    - #### enabled

          protected boolean enabled

      enabled this component

    - #### pattern

          protected String pattern

      The pattern used to format our access log lines.

    - #### prefix

          protected String prefix

      The prefix that is added to log file filenames.

    - #### rotatable

          protected boolean rotatable

      Should we rotate our log file? Default is true (like old behavior)

    - #### renameOnRotate

          protected boolean renameOnRotate

      Should we defer inclusion of the date stamp in the file name until rotate time? Default is false.

    - #### suffix

          protected String suffix

      The suffix that is added to log file filenames.

    - #### writer

          protected PrintWriter writer

      The PrintWriter to which we are currently logging, if any.

    - #### fileDateFormatter

          protected SimpleDateFormat fileDateFormatter

      A date formatter to format a Date using the format given by `fileDateFormat`.

    - #### currentLogFile

          protected File currentLogFile

      The current log file we are writing to. Helpful when checkExists is true.

    - #### condition

          protected String condition

      Are we doing conditional logging. default null. It is the value of `conditionUnless` property.

    - #### conditionIf

          protected String conditionIf

      Are we doing conditional logging. default null. It is the value of `conditionIf` property.

    - #### fileDateFormat

          protected String fileDateFormat

      Date format to place in log file name.

    - #### localeName

          protected String localeName

      Name of locale used to format timestamps in log entries and in log file name suffix.

    - #### locale

          protected Locale locale

      Locale used to format timestamps in log entries and in log file name suffix.

    - #### encoding

          protected String encoding

      Character set used by the log file. If it is `null`, the system default character set will be used. An empty string will be treated as `null` when this property is assigned.

    - #### logElements

          protected AccessLogValve.AccessLogElement[] logElements

      Array of AccessLogElement, they will be used to make log message.

    - #### requestAttributesEnabled

          protected boolean requestAttributesEnabled

      Should this valve set request attributes for IP address, hostname, protocol and port used for the request. Default is `false`.
      See Also:
        `setRequestAttributesEnabled(boolean)`

  - ### Constructor Detail

    - #### AccessLogValve

          public AccessLogValve()

  - ### Method Detail

    - #### getEnabled

          public boolean getEnabled()

      Returns:
        Returns the enabled.

    - #### setRequestAttributesEnabled

          public void setRequestAttributesEnabled(boolean requestAttributesEnabled)

      Should this valve set request attributes for IP address, hostname, protocol and port used for the request? This are typically used in conjunction with the `AccessLogValve` which will otherwise log the original values. The attributes set are:
      - org.apache.catalina.RemoteAddr
      - org.apache.catalina.RemoteHost
      - org.apache.catalina.Protocol
      - org.apache.catalina.ServerPost
      Default is `false`.
      Specified by:
        `setRequestAttributesEnabled` in interface `AccessLog`
      Parameters:
        `requestAttributesEnabled` - `true` causes the attributes to be set, `false` disables the setting of the attributes.

    - #### getRequestAttributesEnabled

          public boolean getRequestAttributesEnabled()

      Specified by:
        `getRequestAttributesEnabled` in interface `AccessLog`
      Returns:
        `true` if the attributes will be logged, otherwise `false`
      See Also:
        `AccessLog.setRequestAttributesEnabled(boolean)`

    - #### setEnabled

          public void setEnabled(boolean enabled)

      Parameters:
        `enabled` - The enabled to set.

    - #### getDirectory

          public String getDirectory()

      Return the directory in which we create log files.

    - #### setDirectory

          public void setDirectory(String directory)

      Set the directory in which we create log files.
      Parameters:
        `directory` - The new log file directory

    - #### getInfo

          public String getInfo()

      Return descriptive information about this implementation.
      Specified by:
        `getInfo` in interface `Valve`
      Overrides:
        `getInfo` in class `ValveBase`

    - #### getPattern

          public String getPattern()

      Return the format pattern.

    - #### setPattern

          public void setPattern(String pattern)

      Set the format pattern, first translating any recognized alias.
      Parameters:
        `pattern` - The new pattern

    - #### 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.

    - #### getPrefix

          public String getPrefix()

      Return the log file prefix.

    - #### setPrefix

          public void setPrefix(String prefix)

      Set the log file prefix.
      Parameters:
        `prefix` - The new log file prefix

    - #### isRotatable

          public boolean isRotatable()

      Should we rotate the access log.
      Returns:
        `true` if the access log should be rotated

    - #### setRotatable

          public void setRotatable(boolean rotatable)

      Configure whether the access log should be rotated.
      Parameters:
        `rotatable` - true if the log should be rotated

    - #### isRenameOnRotate

          public boolean isRenameOnRotate()

      Should we defer inclusion of the date stamp in the file name until rotate time

    - #### setRenameOnRotate

          public void setRenameOnRotate(boolean renameOnRotate)

      Set the value if we should defer inclusion of the date stamp in the file name until rotate time
      Parameters:
        `renameOnRotate` - true if defer inclusion of date stamp

    - #### isBuffered

          public boolean isBuffered()

      Is the logging buffered

    - #### setBuffered

          public void setBuffered(boolean buffered)

      Set the value if the logging should be buffered
      Parameters:
        `buffered` - true if buffered.

    - #### getSuffix

          public String getSuffix()

      Return the log file suffix.

    - #### setSuffix

          public void setSuffix(String suffix)

      Set the log file suffix.
      Parameters:
        `suffix` - The new log file suffix

    - #### setResolveHosts

          @Deprecated
          public void setResolveHosts(boolean resolveHosts)

      Deprecated. Unused, removed in Tomcat 8. See org.apache.catalina.connector.Connector.setEnableLookups(boolean).
      Set the resolve hosts flag.
      Parameters:
        `resolveHosts` - The new resolve hosts value

    - #### isResolveHosts

          @Deprecated
          public boolean isResolveHosts()

      Deprecated. Unused, removed in Tomcat 8. See org.apache.catalina.connector.Connector.setEnableLookups(boolean).
      Get the value of the resolve hosts flag.

    - #### getCondition

          public String getCondition()

      Return whether the attribute name to look for when performing conditional logging. If null, every request is logged.

    - #### setCondition

          public void setCondition(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

    - #### getConditionUnless

          public String getConditionUnless()

      Return whether the attribute name to look for when performing conditional logging. If null, every request is logged.

    - #### setConditionUnless

          public void setConditionUnless(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

    - #### getConditionIf

          public String getConditionIf()

      Return whether the attribute name to look for when performing conditional logging. If null, every request is logged.

    - #### setConditionIf

          public void setConditionIf(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 String getFileDateFormat()

      Return the date format date based log rotation.

    - #### setFileDateFormat

          public void setFileDateFormat(String fileDateFormat)

      Set the date format date based log rotation.

    - #### getLocale

          public String getLocale()

      Return the locale used to format timestamps in log entries and in log file name suffix.

    - #### setLocale

          public void setLocale(String localeName)

      Set the locale used to format timestamps in log entries and in log file name suffix. Changing the locale is only supported as long as the AccessLogValve has not logged anything. Changing the locale later can lead to inconsistent formatting.
      Parameters:
        `localeName` - The locale to use.

    - #### getEncoding

          public String getEncoding()

      Return the character set name that is used to write the log file.
      Returns:
        Character set name, or `null` if the system default character set is used.

    - #### setEncoding

          public void setEncoding(String encoding)

      Set the character set that is used to write the log file.
      Parameters:
        `encoding` - The name of the character set.

    - #### backgroundProcess

          public void backgroundProcess()

      Execute a periodic task, such as reloading, etc. This method will be invoked inside the classloading context of this container. Unexpected throwables will be caught and logged.
      Specified by:
        `backgroundProcess` in interface `Valve`
      Overrides:
        `backgroundProcess` in class `ValveBase`

    - #### invoke

          public void invoke(Request request,
                    Response response)
                      throws IOException,
                             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
      Throws:
        `IOException` - if an input/output error has occurred
        `ServletException` - if a servlet error has occurred

    - #### log

          public void log(Request request,
                 Response response,
                 long time)

      Description copied from interface: `AccessLog`
      Add the request/response to the access log using the specified processing time.
      Specified by:
        `log` in interface `AccessLog`
      Parameters:
        `request` - Request (associated with the response) to log
        `response` - Response (associated with the request) to log
        `time` - Time taken to process the request/response in milliseconds (use 0 if not known)

    - #### rotate

          public void rotate()

      Rotate the log file if necessary.

    - #### rotate

          public boolean rotate(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

    - #### log

          public void log(String message)

      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

    - #### open

          protected void open()

      Open the new log file for the date specified by `dateStamp`.

    - #### findLocale

          protected static Locale findLocale(String name,
                          Locale fallback)

      Find a locale by name

    - #### startInternal

          protected void startInternal()
                                throws LifecycleException

      Start this component and implement the requirements of `LifecycleBase.startInternal()`.
      Overrides:
        `startInternal` in class `ValveBase`
      Throws:
        `LifecycleException` - if this component detects a fatal error that prevents this component from being used

    - #### stopInternal

          protected void stopInternal()
                               throws LifecycleException

      Stop this component and implement the requirements of `LifecycleBase.stopInternal()`.
      Overrides:
        `stopInternal` in class `ValveBase`
      Throws:
        `LifecycleException` - if this component detects a fatal error that prevents this component from being used

    - #### createLogElements

          protected AccessLogValve.AccessLogElement[] createLogElements()

      parse pattern string and create the array of AccessLogElement

    - #### createAccessLogElement

          protected AccessLogValve.AccessLogElement createAccessLogElement(String name,
                                                               char pattern)

      create an AccessLogElement implementation which needs an element name

    - #### createAccessLogElement

          protected AccessLogValve.AccessLogElement createAccessLogElement(char pattern)

      create an AccessLogElement implementation

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