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# Apache log4cxx Class List

Here are the classes, structs, unions and interfaces with brief descriptions:

AbsoluteTimeDateFormat | Formats a date in the format HH:mm:ss,SSS for example, "15:49:37,459"
Action | A file system action performed as part of a rollover event
AndFilter | A filter that 'and's the results of any number of contained filters together
Appender | Implement this interface for your own strategies for outputting log statements
AppenderAttachable | This Interface is for attaching Appenders to objects
AppenderAttachableImpl |
AppenderSkeleton | Implementation base class for all appenders
APRInitializer |
AsyncAppender | The AsyncAppender lets users log events asynchronously
BasicConfigurator | Use this class to quickly configure the package
BindException | Signals that an error occurred while attempting to bind a socket to a local address and port
BufferedOutputStream | Abstract class for writing to character streams
BufferedWriter | Writes text to a character-output stream buffering requests to increase efficiency
ByteArrayInputStream | InputStream implemented on top of a byte array
ByteArrayOutputStream | OutputStream implemented on top of std::vector
ByteBuffer | A byte buffer
CachedDateFormat |
CharMessageBuffer | This class is used by the LOG4CXX_INFO and similar macros to support insertion operators in the message parameter
CharsetDecoder | An abstract engine to transform a sequences of bytes in a specific charset into a LogString
CharsetEncoder | An engine to transform LogStrings into bytes for the specific character set
Class |
ClassNamePatternConverter | Formats the class name of the site of the logging request
ClassNotFoundException | Thrown when an application tries to load in a class through its string name but no definition for the class with the specified name could be found
ClassRegistration |
ClosedChannelException |
Condition | This class provides a means for one thread to suspend exception until notified by another thread to resume
Configurator | Implemented by classes capable of configuring log4j using a URL
ConnectException | Signals that an error occurred while attempting to connect a socket to a remote address and port
ConsoleAppender | ConsoleAppender appends log events to `stdout` or `stderr` using a layout specified by the user
CyclicBuffer | CyclicBuffer is used by other appenders to hold instances of LoggingEvent for immediate or deferred display
DailyRollingFileAppender | DailyRollingFileAppender extends FileAppender so that the underlying file is rolled over at a user chosen frequency
DatagramPacket | This class represents a datagram packet
DatagramSocket | This class represents a socket for sending and receiving datagram packets
Date | Simple transcoder for converting between external char and wchar_t strings and internal strings
DateFormat | DateFormat is an abstract class for date/time formatting patterned after java.text.DateFormat
DateLayout | This abstract layout takes care of all the date related options and formatting work
DatePatternConverter | Convert and format the event's date in a StringBuffer
DateTimeDateFormat | Formats a date in the format dd MMM yyyy HH:mm:ss,SSS for example, "06 Nov 1994 15:49:37,459"
DefaultConfigurator | Configures the repository from environmental settings and files
DefaultLoggerFactory |
DefaultRepositorySelector |
DenyAllFilter | This filter drops all logging events
DOMConfigurator | Use this class to initialize the log4cxx environment using a DOM tree
DOMException |
ErrorCode |
ErrorHandler | Appenders may delegate their error handling to `ErrorHandlers`
Exception | The class Exception and its subclasses indicate conditions that a reasonable application might want to catch
ExpressionFilter | A filter supporting complex expressions - supports both infix and postfix expressions (infix expressions must first be converted to postfix prior to processing)
FallbackErrorHandler | The `FallbackErrorHandler` implements the ErrorHandler interface such that a secondary appender may be specified
File | An abstract representation of file and directory path names
FileAppender | FileAppender appends log events to a file
FileDatePatternConverter | Formats an date by delegating to DatePatternConverter
FileInputStream | InputStream implemented on top of APR file IO
FileLocationPatternConverter | Return the event's line location information in a StringBuffer
FileOutputStream | OutputStream implemented on top of APR file IO
FileRenameAction |
FileWatchdog | Check every now and then that a certain file has not changed
Filter | Users should extend this class to implement customized logging event filtering
FilterBasedTriggeringPolicy | FilterBasedTriggeringPolicy determines if rolling should be triggered by evaluating the current message against a set of filters
FixedWindowRollingPolicy | When rolling over, `FixedWindowRollingPolicy` renames files according to a fixed window algorithm as described below
FormattingInfo | Modifies the output of a pattern converter for a specified minimum and maximum width and alignment
FullLocationPatternConverter | Format the event's line location information
GZCompressAction |
Hierarchy | This class is specialized in retrieving loggers by name and also maintaining the logger hierarchy
HierarchyEventListener | Listen to events occuring within a Hierarchy
HTMLLayout | This layout outputs events in a HTML table
IllegalArgumentException | Thrown to indicate that a method has been passed an illegal or inappropriate argument
IllegalMonitorStateException |
IllegalStateException |
InetAddress |
InputStream | Abstract class for reading from character streams
InputStreamReader | Class for reading from character streams
InstantiationException | Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated because it is an interface or is an abstract class
Integer |
IntegerPatternConverter | Formats an integer
InterruptedException |
InterruptedIOException | Signals that an I/O operation has been interrupted
IOException | Signals that an I/O exception of some sort has occurred
ISO8601DateFormat | Formats a date in the format yyyy-MM-dd HH:mm:ss,SSS for example "1999-11-27 15:49:37,459"
Layout | Extend this abstract class to create your own log layout format
Level | Defines the minimum set of levels recognized by the system, that is `OFF`, `FATAL`, `ERROR`, `WARN`, `INFO`, `DEBUG` and `ALL`
Level::LevelClass |
LevelMatchFilter | This is a very simple filter based on level matching
LevelPatternConverter | Return the event's level in a StringBuffer
LevelRangeFilter | This is a very simple filter based on level matching, which can be used to reject messages with priorities outside a certain range
LineLocationPatternConverter | Format the event's line location information
LineSeparatorPatternConverter | Formats a line separator
LiteralPatternConverter | Formats a string literal
Loader |
Locale |
LocationInfo | This class represents the location of a logging statement
LocationInfoFilter | Location information is usually specified at the appender level - all events associated with an appender either create and parse stack traces or they do not
Logger | This is the central class in the log4cxx package
LoggerFactory | Implement this interface to create new instances of Logger or a sub-class of Logger
LoggerPatternConverter | Formats a logger name
LoggerRepository | A `LoggerRepository` is used to create and retrieve `Loggers`
LoggingEvent | The internal representation of logging events
LoggingEventPatternConverter | LoggingEventPatternConverter is a base class for pattern converters that can format information from instances of LoggingEvent
LogLog | This class used to output log statements from within the log4cxx package
LogManager | Use the `LogManager` class to retreive Logger instances or to operate on the current LoggerRepository
logstream | An STL-like stream API for log4cxx using char as the character type
logstream_base | Base class for the basic_logstream template which attempts to emulate std::basic_ostream but attempts to short-circuit unnecessary operations
ManualTriggeringPolicy | ManualTriggeringPolicy only rolls over on explicit calls to RollingFileAppender.rollover()
MapFilter |
MDC | Similar to the NDC class except that it is based on a map instead of a stack
MessageBuffer | This class is used by the LOG4CXX_INFO and similar macros to support insertion operators in the message parameter
MessagePatternConverter | Formats the message of an logging event
MethodLocationPatternConverter | Return the event's line location information in a StringBuffer
MissingResourceException |
Mutex |
MutexException |
NameAbbreviator | NameAbbreviator generates abbreviated logger and class names
NamePatternConverter | Base class for other pattern converters which can return only parts of their name
NDC | Ndc class implements nested diagnostic contexts as defined by neil harrison in the article "patterns for logging diagnostic messages" part of the book "pattern languages of program design 3" edited by martin et al
NDCPatternConverter | Return the event's NDC in a StringBuffer
NoSuchElementException |
NTEventLogAppender | Appends log events to NT EventLog
NullPointerException | Thrown when an application attempts to use null in a case where an object is required
Object | Base class for java-like objects
Object::ClazzObject |
ObjectImpl | Implementation class for Object
ObjectOutputStream | Emulates java serialization
ObjectPtrBase |
ObjectPtrT | Smart pointer to a Object descendant
ODBCAppender |
OnlyOnceErrorHandler | The `OnlyOnceErrorHandler` implements log4cxx's default error handling policy which consists of emitting a message for the first error in an appender and ignoring all following errors
OptionConverter | A convenience class to convert property values to specific types
OptionHandler | A string based interface to configure package components
OutputDebugStringAppender |
OutputStream | Abstract class for writing to character streams
OutputStreamWriter | Abstract class for writing to character streams
PatternConverter |
PatternLayout | A flexible layout configurable with pattern string
PatternParser | Most of the work of the PatternLayout class is delegated to the PatternParser class
Pool |
PoolException |
Properties |
PropertiesPatternConverter | Able to handle the contents of the LoggingEvent's Property bundle and either output the entire contents of the properties in a similar format to the java.util.Hashtable.toString(), or to output the value of a specific key within the property bundle when this pattern converter has the option set
PropertyConfigurator | Allows the configuration of log4cxx from an external file
PropertyFilter | NOTE: This filter modifies logging events by adding properties to the event
PropertyResourceBundle | PropertyResourceBundle is a concrete subclass of ResourceBundle that manages resources for a locale using a set of static strings from a property file
PropertySetter | General purpose Object property setter
Reader | Abstract class for reading from character streams
RelativeTimeDateFormat | Formats a date by printing the number of seconds elapsed since the start of the application
RelativeTimePatternConverter | Format the relative time in milliseconds
RepositorySelector | The `LogManager` uses one (and only one) `RepositorySelector` implementation to select the LoggerRepository for a particular application context
ResourceBundle | Resource bundles contain locale-specific objects
RollingFileAppender | `RollingFileAppender` extends log4cxx::FileAppender to backup the log files depending on RollingPolicy and TriggeringPolicy
RollingFileAppender | RollingFileAppender extends FileAppender to backup the log files when they reach a certain size
RollingFileAppenderSkeleton | Base class for log4cxx::rolling::RollingFileAppender and log4cxx::RollingFileAppender (analogues of org.apache.log4j.rolling.RFA from extras companion and org.apache.log4j.RFA from log4j 1.2, respectively)
RollingPolicy | A `RollingPolicy` is responsible for performing the rolling over of the active log file
RollingPolicyBase | Implements methods common to most, it not all, rolling policies
RolloverDescription |
RootLogger | RootLogger sits at the top of the logger hierachy
RuntimeException | RuntimeException is the parent class of those exceptions that can be thrown during the normal operation of the process
ServerSocket |
SimpleDateFormat | Concrete class for formatting and parsing dates in a locale-sensitive manner
SimpleLayout | SimpleLayout consists of the level of the log statement, followed by " - " and then the log message itself
SizeBasedTriggeringPolicy | SizeBasedTriggeringPolicy looks at size of the file being currently written to
SMTPAppender | Send an e-mail when a specific logging event occurs, typically on errors or fatal errors
Socket |
SocketAppender | Sends LoggingEvent objects to a remote a log server, usually Apache Chainsaw
SocketAppenderSkeleton | Abstract base class for SocketAppender and XMLSocketAppender
SocketException | Thrown to indicate that there is an error in the underlying protocol, such as a TCP error
SocketHubAppender | Sends LoggingEvent objects to a set of remote log servers, usually a SocketNode
SocketOutputStream |
SocketTimeoutException | Signals that an I/O operation has been interrupted
SQLException |
StrftimeDateFormat | Concrete class for formatting and parsing dates in a locale-sensitive manner
StrictMath | The class StrictMath contains methods for performing basic numeric operations
StringHelper | String manipulation routines
StringMatchFilter | This is a very simple filter based on string matching
StringTokenizer |
synchronized | Utility class for objects multi-thread synchronization
SyslogAppender | Use SyslogAppender to send log messages to a remote syslog daemon
SyslogWriter | SyslogWriter is a wrapper around the DatagramSocket class it writes text to the specified host on the port 514 (UNIX syslog)
System | Several useful class fields and methods
SystemErrWriter | Abstract class for writing to character streams
SystemOutWriter | Abstract class for writing to character streams
TelnetAppender |
Thread | This class implements an approximation of java.util.Thread
ThreadException |
ThreadLocal | This class provides thread-local variables
ThreadPatternConverter | Formats the event thread name
ThreadSpecificData | This class contains all the thread-specific data in use by log4cxx
ThrowableInformationPatternConverter | Outputs the ThrowableInformation portion of the LoggingiEvent as a full stacktrace unless this converter's option is 'short', where it just outputs the first line of the trace
TimeBasedRollingPolicy | `TimeBasedRollingPolicy` is both easy to configure and quite powerful
TimeZone |
Transcoder | Simple transcoder for converting between external char and wchar_t strings and internal strings
TranscoderException |
Transform | Utility class for transforming strings
TriggeringEventEvaluator | Implementions of this interface allow certain appenders to decide when to perform an appender specific action
TriggeringPolicy | A `TriggeringPolicy` controls the conditions under which rollover occurs
TTCCLayout | TTCC layout format consists of time, thread, logger name and nested diagnostic context information, hence the name
ulogstream | An STL-like stream API for log4cxx using UniChar as the character type
UniCharMessageBuffer | This class is designed to support insertion operations in the message argument to the LOG4CXX_INFO and similar macros and is not designed for general purpose use
UnknownHostException |
WideMessageBuffer | This class is designed to support insertion operations in the message argument to the LOG4CXX_INFO and similar macros and is not designed for general purpose use
wlogstream | An STL-like stream API for log4cxx using wchar_t as the character type
Writer | Abstract class for writing to character streams
WriterAppender | WriterAppender appends log events to a standard output stream
XMLDOMDocument | The XMLDOMDocument interface represents an entire XML document
XMLDOMElement | The XMLDOMElement interface represents an element in an XML document
XMLDOMNode | The XMLDOMNode interface is the primary datatype for the entire Document Object Model
XMLDOMNodeList | The XMLDOMNodeList interface provides the abstraction of an ordered collection of nodes, without defining or constraining how this collection is implemented
XMLLayout | The output of the XMLLayout consists of a series of log4j:event elements
XMLSocketAppender | Sends LoggingEvent objects in XML format to a remote a log server, usually a XMLSocketNode
ZipCompressAction |