/*
* @(#)Logger.java 1.50 08/07/11
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.util.logging;
import java.util.*;
import java.security.*;
import java.lang.ref.WeakReference;
/**
* A Logger object is used to log messages for a specific
* system or application component. Loggers are normally named,
* using a hierarchical dot-separated namespace. Logger names
* can be arbitrary strings, but they should normally be based on
* the package name or class name of the logged component, such
* as java.net or javax.swing. In addition it is possible to create
* "anonymous" Loggers that are not stored in the Logger namespace.
* <p>
* Logger objects may be obtained by calls on one of the getLogger
* factory methods. These will either create a new Logger or
* return a suitable existing Logger.
* <p>
* Logging messages will be forwarded to registered Handler
* objects, which can forward the messages to a variety of
* destinations, including consoles, files, OS logs, etc.
* <p>
* Each Logger keeps track of a "parent" Logger, which is its
* nearest existing ancestor in the Logger namespace.
* <p>
* Each Logger has a "Level" associated with it. This reflects
* a minimum Level that this logger cares about. If a Logger's
* level is set to <tt>null</tt>, then its effective level is inherited
* from its parent, which may in turn obtain it recursively from its
* parent, and so on up the tree.
* <p>
* The log level can be configured based on the properties from the
* logging configuration file, as described in the description
* of the LogManager class. However it may also be dynamically changed
* by calls on the Logger.setLevel method. If a logger's level is
* changed the change may also affect child loggers, since any child
* logger that has <tt>null</tt> as its level will inherit its
* effective level from its parent.
* <p>
* On each logging call the Logger initially performs a cheap
* check of the request level (e.g. SEVERE or FINE) against the
* effective log level of the logger. If the request level is
* lower than the log level, the logging call returns immediately.
* <p>
* After passing this initial (cheap) test, the Logger will allocate
* a LogRecord to describe the logging message. It will then call a
* Filter (if present) to do a more detailed check on whether the
* record should be published. If that passes it will then publish
* the LogRecord to its output Handlers. By default, loggers also
* publish to their parent's Handlers, recursively up the tree.
* <p>
* Each Logger may have a ResourceBundle name associated with it.
* The named bundle will be used for localizing logging messages.
* If a Logger does not have its own ResourceBundle name, then
* it will inherit the ResourceBundle name from its parent,
* recursively up the tree.
* <p>
* Most of the logger output methods take a "msg" argument. This
* msg argument may be either a raw value or a localization key.
* During formatting, if the logger has (or inherits) a localization
* ResourceBundle and if the ResourceBundle has a mapping for the msg
* string, then the msg string is replaced by the localized value.
* Otherwise the original msg string is used. Typically, formatters use
* java.text.MessageFormat style formatting to format parameters, so
* for example a format string "{0} {1}" would format two parameters
* as strings.
* <p>
* When mapping ResourceBundle names to ResourceBundles, the Logger
* will first try to use the Thread's ContextClassLoader. If that
* is null it will try the SystemClassLoader instead. As a temporary
* transition feature in the initial implementation, if the Logger is
* unable to locate a ResourceBundle from the ContextClassLoader or
* SystemClassLoader the Logger will also search up the class stack
* and use successive calling ClassLoaders to try to locate a ResourceBundle.
* (This call stack search is to allow containers to transition to
* using ContextClassLoaders and is likely to be removed in future
* versions.)
* <p>
* Formatting (including localization) is the responsibility of
* the output Handler, which will typically call a Formatter.
* <p>
* Note that formatting need not occur synchronously. It may be delayed
* until a LogRecord is actually written to an external sink.
* <p>
* The logging methods are grouped in five main categories:
* <ul>
* <li><p>
* There are a set of "log" methods that take a log level, a message
* string, and optionally some parameters to the message string.
* <li><p>
* There are a set of "logp" methods (for "log precise") that are
* like the "log" methods, but also take an explicit source class name
* and method name.
* <li><p>
* There are a set of "logrb" method (for "log with resource bundle")
* that are like the "logp" method, but also take an explicit resource
* bundle name for use in localizing the log message.
* <li><p>
* There are convenience methods for tracing method entries (the
* "entering" methods), method returns (the "exiting" methods) and
* throwing exceptions (the "throwing" methods).
* <li><p>
* Finally, there are a set of convenience methods for use in the
* very simplest cases, when a developer simply wants to log a
* simple string at a given log level. These methods are named
* after the standard Level names ("severe", "warning", "info", etc.)
* and take a single argument, a message string.
* </ul>
* <p>
* For the methods that do not take an explicit source name and
* method name, the Logging framework will make a "best effort"
* to determine which class and method called into the logging method.
* However, it is important to realize that this automatically inferred
* information may only be approximate (or may even be quite wrong!).
* Virtual machines are allowed to do extensive optimizations when
* JITing and may entirely remove stack frames, making it impossible
* to reliably locate the calling class and method.
* <P>
* All methods on Logger are multi-thread safe.
* <p>
* <b>Subclassing Information:</b> Note that a LogManager class may
* provide its own implementation of named Loggers for any point in
* the namespace. Therefore, any subclasses of Logger (unless they
* are implemented in conjunction with a new LogManager class) should
* take care to obtain a Logger instance from the LogManager class and
* should delegate operations such as "isLoggable" and "log(LogRecord)"
* to that instance. Note that in order to intercept all logging
* output, subclasses need only override the log(LogRecord) method.
* All the other logging methods are implemented as calls on this
* log(LogRecord) method.
*
* @version 1.50, 07/11/08
* @since 1.4
*/
public class Logger {
private static final Handler emptyHandlers[] = new Handler[0];
private static final int offValue = Level.OFF.intValue();
private LogManager manager;
private String name;
private ArrayList handlers;
private String resourceBundleName;
private boolean useParentHandlers = true;
private Filter filter;
private boolean anonymous;
private ResourceBundle catalog; // Cached resource bundle
private String catalogName; // name associated with catalog
private Locale catalogLocale; // locale associated with catalog
// The fields relating to parent-child relationships and levels
// are managed under a separate lock, the treeLock.
private static Object treeLock = new Object();
// We keep weak references from parents to children, but strong
// references from children to parents.
private Logger parent; // our nearest parent.
private ArrayList kids; // WeakReferences to loggers that have us as parent
private Level levelObject;
private volatile int levelValue; // current effective level value
/**
* GLOBAL_LOGGER_NAME is a name for the global logger.
* This name is provided as a convenience to developers who are making
* casual use of the Logging package. Developers who are making serious
* use of the logging package (for example in products) should create
* and use their own Logger objects, with appropriate names, so that
* logging can be controlled on a suitable per-Logger granularity.
* <p>
* The preferred way to get the global logger object is via the call
* <code>Logger.getLogger(Logger.GLOBAL_LOGGER_NAME)</code>.
* @since 1.6
*/
public static final String GLOBAL_LOGGER_NAME = "global";
/**
* The "global" Logger object is provided as a convenience to developers
* who are making casual use of the Logging package. Developers
* who are making serious use of the logging package (for example
* in products) should create and use their own Logger objects,
* with appropriate names, so that logging can be controlled on a
* suitable per-Logger granularity.
* <p>
* @deprecated Initialization of this field is prone to deadlocks.
* The field must be initialized by the Logger class initialization
* which may cause deadlocks with the LogManager class initialization.
* In such cases two class initialization wait for each other to complete.
* As of JDK version 1.6, the preferred way to get the global logger object
* is via the call <code>Logger.getLogger(Logger.GLOBAL_LOGGER_NAME)</code>.
*/
@Deprecated
public static final Logger global = new Logger(GLOBAL_LOGGER_NAME);
/**
* Protected method to construct a logger for a named subsystem.
* <p>
* The logger will be initially configured with a null Level
* and with useParentHandlers true.
*
* @param name A name for the logger. This should
* be a dot-separated name and should normally
* be based on the package name or class name
* of the subsystem, such as java.net
* or javax.swing. It may be null for anonymous Loggers.
* @param resourceBundleName name of ResourceBundle to be used for localizing
* messages for this logger. May be null if none
* of the messages require localization.
* @throws MissingResourceException if the ResourceBundleName is non-null and
* no corresponding resource can be found.
*/
protected Logger(String name, String resourceBundleName) {
this.manager = LogManager.getLogManager();
if (resourceBundleName != null) {
// Note: we may get a MissingResourceException here.
setupResourceInfo(resourceBundleName);
}
this.name = name;
levelValue = Level.INFO.intValue();
}
// This constructor is used only to create the global Logger.
// It is needed to break a cyclic dependence between the LogManager
// and Logger static initializers causing deadlocks.
private Logger(String name) {
// The manager field is not initialized here.
this.name = name;
levelValue = Level.INFO.intValue();
}
// It is called from the LogManager.<clinit> to complete
// initialization of the global Logger.
void setLogManager(LogManager manager) {
this.manager = manager;
}
private void checkAccess() throws SecurityException {
if (!anonymous) {
if (manager == null) {
// Complete initialization of the global Logger.
manager = LogManager.getLogManager();
}
manager.checkAccess();
}
}
/**
* Find or create a logger for a named subsystem. If a logger has
* already been created with the given name it is returned. Otherwise
* a new logger is created.
* <p>
* If a new logger is created its log level will be configured
* based on the LogManager configuration and it will configured
* to also send logging output to its parent's handlers. It will
* be registered in the LogManager global namespace.
*
* @param name A name for the logger. This should
* be a dot-separated name and should normally
* be based on the package name or class name
* of the subsystem, such as java.net
* or javax.swing
* @return a suitable Logger
* @throws NullPointerException if the name is null.
*/
public static synchronized Logger getLogger(String name) {
LogManager manager = LogManager.getLogManager();
return manager.demandLogger(name);
}
/**
* Find or create a logger for a named subsystem. If a logger has
* already been created with the given name it is returned. Otherwise
* a new logger is created.
* <p>
* If a new logger is created its log level will be configured
* based on the LogManager and it will configured to also send logging
* output to its parent loggers Handlers. It will be registered in
* the LogManager global namespace.
* <p>
* If the named Logger already exists and does not yet have a
* localization resource bundle then the given resource bundle
* name is used. If the named Logger already exists and has
* a different resource bundle name then an IllegalArgumentException
* is thrown.
* <p>
* @param name A name for the logger. This should
* be a dot-separated name and should normally
* be based on the package name or class name
* of the subsystem, such as java.net
* or javax.swing
* @param resourceBundleName name of ResourceBundle to be used for localizing
* messages for this logger. May be <CODE>null</CODE> if none of
* the messages require localization.
* @return a suitable Logger
* @throws MissingResourceException if the named ResourceBundle cannot be found.
* @throws IllegalArgumentException if the Logger already exists and uses
* a different resource bundle name.
* @throws NullPointerException if the name is null.
*/
public static synchronized Logger getLogger(String name, String resourceBundleName) {
LogManager manager = LogManager.getLogManager();
Logger result = manager.demandLogger(name);
if (result.resourceBundleName == null) {
// Note: we may get a MissingResourceException here.
result.setupResourceInfo(resourceBundleName);
} else if (!result.resourceBundleName.equals(resourceBundleName)) {
throw new IllegalArgumentException(result.resourceBundleName +
" != " + resourceBundleName);
}
return result;
}
/**
* Create an anonymous Logger. The newly created Logger is not
* registered in the LogManager namespace. There will be no
* access checks on updates to the logger.
* <p>
* This factory method is primarily intended for use from applets.
* Because the resulting Logger is anonymous it can be kept private
* by the creating class. This removes the need for normal security
* checks, which in turn allows untrusted applet code to update
* the control state of the Logger. For example an applet can do
* a setLevel or an addHandler on an anonymous Logger.
* <p>
* Even although the new logger is anonymous, it is configured
* to have the root logger ("") as its parent. This means that
* by default it inherits its effective level and handlers
* from the root logger.
* <p>
*
* @return a newly created private Logger
*/
public static synchronized Logger getAnonymousLogger() {
LogManager manager = LogManager.getLogManager();
Logger result = new Logger(null, null);
result.anonymous = true;
Logger root = manager.getLogger("");
result.doSetParent(root);
return result;
}
/**
* Create an anonymous Logger. The newly created Logger is not
* registered in the LogManager namespace. There will be no
* access checks on updates to the logger.
* <p>
* This factory method is primarily intended for use from applets.
* Because the resulting Logger is anonymous it can be kept private
* by the creating class. This removes the need for normal security
* checks, which in turn allows untrusted applet code to update
* the control state of the Logger. For example an applet can do
* a setLevel or an addHandler on an anonymous Logger.
* <p>
* Even although the new logger is anonymous, it is configured
* to have the root logger ("") as its parent. This means that
* by default it inherits its effective level and handlers
* from the root logger.
* <p>
* @param resourceBundleName name of ResourceBundle to be used for localizing
* messages for this logger.
* May be null if none of the messages require localization.
* @return a newly created private Logger
* @throws MissingResourceException if the named ResourceBundle cannot be found.
*/
public static synchronized Logger getAnonymousLogger(String resourceBundleName) {
LogManager manager = LogManager.getLogManager();
Logger result = new Logger(null, resourceBundleName);
result.anonymous = true;
Logger root = manager.getLogger("");
result.doSetParent(root);
return result;
}
/**
* Retrieve the localization resource bundle for this
* logger for the current default locale. Note that if
* the result is null, then the Logger will use a resource
* bundle inherited from its parent.
*
* @return localization bundle (may be null)
*/
public ResourceBundle getResourceBundle() {
return findResourceBundle(getResourceBundleName());
}
/**
* Retrieve the localization resource bundle name for this
* logger. Note that if the result is null, then the Logger
* will use a resource bundle name inherited from its parent.
*
* @return localization bundle name (may be null)
*/
public String getResourceBundleName() {
return resourceBundleName;
}
/**
* Set a filter to control output on this Logger.
* <P>
* After passing the initial "level" check, the Logger will
* call this Filter to check if a log record should really
* be published.
*
* @param newFilter a filter object (may be null)
* @exception SecurityException if a security manager exists and if
* the caller does not have LoggingPermission("control").
*/
public void setFilter(Filter newFilter) throws SecurityException {
checkAccess();
filter = newFilter;
}
/**
* Get the current filter for this Logger.
*
* @return a filter object (may be null)
*/
public Filter getFilter() {
return filter;
}
/**
* Log a LogRecord.
* <p>
* All the other logging methods in this class call through
* this method to actually perform any logging. Subclasses can
* override this single method to capture all log activity.
*
* @param record the LogRecord to be published
*/
public void log(LogRecord record) {
if (record.getLevel().intValue() < levelValue || levelValue == offValue) {
return;
}
synchronized (this) {
if (filter != null && !filter.isLoggable(record)) {
return;
}
}
// Post the LogRecord to all our Handlers, and then to
// our parents' handlers, all the way up the tree.
Logger logger = this;
while (logger != null) {
Handler targets[] = logger.getHandlers();
if (targets != null) {
for (int i = 0; i < targets.length; i++) {
targets[i].publish(record);
}
}
if (!logger.getUseParentHandlers()) {
break;
}
logger = logger.getParent();
}
}
// private support method for logging.
// We fill in the logger name, resource bundle name, and
// resource bundle and then call "void log(LogRecord)".
private void doLog(LogRecord lr) {
lr.setLoggerName(name);
String ebname = getEffectiveResourceBundleName();
if (ebname != null) {
lr.setResourceBundleName(ebname);
lr.setResourceBundle(findResourceBundle(ebname));
}
log(lr);
}
//================================================================
// Start of convenience methods WITHOUT className and methodName
//================================================================
/**
* Log a message, with no arguments.
* <p>
* If the logger is currently enabled for the given message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param msg The string message (or a key in the message catalog)
*/
public void log(Level level, String msg) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
doLog(lr);
}
/**
* Log a message, with one object parameter.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param msg The string message (or a key in the message catalog)
* @param param1 parameter to the message
*/
public void log(Level level, String msg, Object param1) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
Object params[] = { param1 };
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, with an array of object arguments.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param msg The string message (or a key in the message catalog)
* @param params array of parameters to the message
*/
public void log(Level level, String msg, Object params[]) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus is it
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with log message.
*/
public void log(Level level, String msg, Throwable thrown) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setThrown(thrown);
doLog(lr);
}
//================================================================
// Start of convenience methods WITH className and methodName
//================================================================
/**
* Log a message, specifying source class and method,
* with no arguments.
* <p>
* If the logger is currently enabled for the given message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
*/
public void logp(Level level, String sourceClass, String sourceMethod, String msg) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
doLog(lr);
}
/**
* Log a message, specifying source class and method,
* with a single object parameter to the log message.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
* @param param1 Parameter to the log message.
*/
public void logp(Level level, String sourceClass, String sourceMethod,
String msg, Object param1) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
Object params[] = { param1 };
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, specifying source class and method,
* with an array of object arguments.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
* @param params Array of parameters to the message
*/
public void logp(Level level, String sourceClass, String sourceMethod,
String msg, Object params[]) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setParameters(params);
doLog(lr);
}
/**
* Log a message, specifying source class and method,
* with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus is it
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with log message.
*/
public void logp(Level level, String sourceClass, String sourceMethod,
String msg, Throwable thrown) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr);
}
//=========================================================================
// Start of convenience methods WITH className, methodName and bundle name.
//=========================================================================
// Private support method for logging for "logrb" methods.
// We fill in the logger name, resource bundle name, and
// resource bundle and then call "void log(LogRecord)".
private void doLog(LogRecord lr, String rbname) {
lr.setLoggerName(name);
if (rbname != null) {
lr.setResourceBundleName(rbname);
lr.setResourceBundle(findResourceBundle(rbname));
}
log(lr);
}
/**
* Log a message, specifying source class, method, and resource bundle name
* with no arguments.
* <p>
* If the logger is currently enabled for the given message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null
* @param msg The string message (or a key in the message catalog)
*/
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
doLog(lr, bundleName);
}
/**
* Log a message, specifying source class, method, and resource bundle name,
* with a single object parameter to the log message.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null
* @param msg The string message (or a key in the message catalog)
* @param param1 Parameter to the log message.
*/
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg, Object param1) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
Object params[] = { param1 };
lr.setParameters(params);
doLog(lr, bundleName);
}
/**
* Log a message, specifying source class, method, and resource bundle name,
* with an array of object arguments.
* <p>
* If the logger is currently enabled for the given message
* level then a corresponding LogRecord is created and forwarded
* to all the registered output Handler objects.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null.
* @param msg The string message (or a key in the message catalog)
* @param params Array of parameters to the message
*/
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg, Object params[]) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setParameters(params);
doLog(lr, bundleName);
}
/**
* Log a message, specifying source class, method, and resource bundle name,
* with associated Throwable information.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers.
* <p>
* The msg string is localized using the named resource bundle. If the
* resource bundle name is null, or an empty String or invalid
* then the msg string is not localized.
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus is it
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
* <p>
* @param level One of the message level identifiers, e.g. SEVERE
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that issued the logging request
* @param bundleName name of resource bundle to localize msg,
* can be null
* @param msg The string message (or a key in the message catalog)
* @param thrown Throwable associated with log message.
*/
public void logrb(Level level, String sourceClass, String sourceMethod,
String bundleName, String msg, Throwable thrown) {
if (level.intValue() < levelValue || levelValue == offValue) {
return;
}
LogRecord lr = new LogRecord(level, msg);
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr, bundleName);
}
//======================================================================
// Start of convenience methods for logging method entries and returns.
//======================================================================
/**
* Log a method entry.
* <p>
* This is a convenience method that can be used to log entry
* to a method. A LogRecord with message "ENTRY", log level
* FINER, and the given sourceMethod and sourceClass is logged.
* <p>
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that is being entered
*/
public void entering(String sourceClass, String sourceMethod) {
if (Level.FINER.intValue() < levelValue) {
return;
}
logp(Level.FINER, sourceClass, sourceMethod, "ENTRY");
}
/**
* Log a method entry, with one parameter.
* <p>
* This is a convenience method that can be used to log entry
* to a method. A LogRecord with message "ENTRY {0}", log level
* FINER, and the given sourceMethod, sourceClass, and parameter
* is logged.
* <p>
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that is being entered
* @param param1 parameter to the method being entered
*/
public void entering(String sourceClass, String sourceMethod, Object param1) {
if (Level.FINER.intValue() < levelValue) {
return;
}
Object params[] = { param1 };
logp(Level.FINER, sourceClass, sourceMethod, "ENTRY {0}", params);
}
/**
* Log a method entry, with an array of parameters.
* <p>
* This is a convenience method that can be used to log entry
* to a method. A LogRecord with message "ENTRY" (followed by a
* format {N} indicator for each entry in the parameter array),
* log level FINER, and the given sourceMethod, sourceClass, and
* parameters is logged.
* <p>
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of method that is being entered
* @param params array of parameters to the method being entered
*/
public void entering(String sourceClass, String sourceMethod, Object params[]) {
if (Level.FINER.intValue() < levelValue) {
return;
}
String msg = "ENTRY";
if (params == null ) {
logp(Level.FINER, sourceClass, sourceMethod, msg);
return;
}
for (int i = 0; i < params.length; i++) {
msg = msg + " {" + i + "}";
}
logp(Level.FINER, sourceClass, sourceMethod, msg, params);
}
/**
* Log a method return.
* <p>
* This is a convenience method that can be used to log returning
* from a method. A LogRecord with message "RETURN", log level
* FINER, and the given sourceMethod and sourceClass is logged.
* <p>
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of the method
*/
public void exiting(String sourceClass, String sourceMethod) {
if (Level.FINER.intValue() < levelValue) {
return;
}
logp(Level.FINER, sourceClass, sourceMethod, "RETURN");
}
/**
* Log a method return, with result object.
* <p>
* This is a convenience method that can be used to log returning
* from a method. A LogRecord with message "RETURN {0}", log level
* FINER, and the gives sourceMethod, sourceClass, and result
* object is logged.
* <p>
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of the method
* @param result Object that is being returned
*/
public void exiting(String sourceClass, String sourceMethod, Object result) {
if (Level.FINER.intValue() < levelValue) {
return;
}
Object params[] = { result };
logp(Level.FINER, sourceClass, sourceMethod, "RETURN {0}", result);
}
/**
* Log throwing an exception.
* <p>
* This is a convenience method to log that a method is
* terminating by throwing an exception. The logging is done
* using the FINER level.
* <p>
* If the logger is currently enabled for the given message
* level then the given arguments are stored in a LogRecord
* which is forwarded to all registered output handlers. The
* LogRecord's message is set to "THROW".
* <p>
* Note that the thrown argument is stored in the LogRecord thrown
* property, rather than the LogRecord parameters property. Thus is it
* processed specially by output Formatters and is not treated
* as a formatting parameter to the LogRecord message property.
* <p>
* @param sourceClass name of class that issued the logging request
* @param sourceMethod name of the method.
* @param thrown The Throwable that is being thrown.
*/
public void throwing(String sourceClass, String sourceMethod, Throwable thrown) {
if (Level.FINER.intValue() < levelValue || levelValue == offValue ) {
return;
}
LogRecord lr = new LogRecord(Level.FINER, "THROW");
lr.setSourceClassName(sourceClass);
lr.setSourceMethodName(sourceMethod);
lr.setThrown(thrown);
doLog(lr);
}
//=======================================================================
// Start of simple convenience methods using level names as method names
//=======================================================================
/**
* Log a SEVERE message.
* <p>
* If the logger is currently enabled for the SEVERE message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param msg The string message (or a key in the message catalog)
*/
public void severe(String msg) {
if (Level.SEVERE.intValue() < levelValue) {
return;
}
log(Level.SEVERE, msg);
}
/**
* Log a WARNING message.
* <p>
* If the logger is currently enabled for the WARNING message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param msg The string message (or a key in the message catalog)
*/
public void warning(String msg) {
if (Level.WARNING.intValue() < levelValue) {
return;
}
log(Level.WARNING, msg);
}
/**
* Log an INFO message.
* <p>
* If the logger is currently enabled for the INFO message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param msg The string message (or a key in the message catalog)
*/
public void info(String msg) {
if (Level.INFO.intValue() < levelValue) {
return;
}
log(Level.INFO, msg);
}
/**
* Log a CONFIG message.
* <p>
* If the logger is currently enabled for the CONFIG message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param msg The string message (or a key in the message catalog)
*/
public void config(String msg) {
if (Level.CONFIG.intValue() < levelValue) {
return;
}
log(Level.CONFIG, msg);
}
/**
* Log a FINE message.
* <p>
* If the logger is currently enabled for the FINE message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param msg The string message (or a key in the message catalog)
*/
public void fine(String msg) {
if (Level.FINE.intValue() < levelValue) {
return;
}
log(Level.FINE, msg);
}
/**
* Log a FINER message.
* <p>
* If the logger is currently enabled for the FINER message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param msg The string message (or a key in the message catalog)
*/
public void finer(String msg) {
if (Level.FINER.intValue() < levelValue) {
return;
}
log(Level.FINER, msg);
}
/**
* Log a FINEST message.
* <p>
* If the logger is currently enabled for the FINEST message
* level then the given message is forwarded to all the
* registered output Handler objects.
* <p>
* @param msg The string message (or a key in the message catalog)
*/
public void finest(String msg) {
if (Level.FINEST.intValue() < levelValue) {
return;
}
log(Level.FINEST, msg);
}
//================================================================
// End of convenience methods
//================================================================
/**
* Set the log level specifying which message levels will be
* logged by this logger. Message levels lower than this
* value will be discarded. The level value Level.OFF
* can be used to turn off logging.
* <p>
* If the new level is null, it means that this node should
* inherit its level from its nearest ancestor with a specific
* (non-null) level value.
*
* @param newLevel the new value for the log level (may be null)
* @exception SecurityException if a security manager exists and if
* the caller does not have LoggingPermission("control").
*/
public void setLevel(Level newLevel) throws SecurityException {
checkAccess();
synchronized (treeLock) {
levelObject = newLevel;
updateEffectiveLevel();
}
}
/**
* Get the log Level that has been specified for this Logger.
* The result may be null, which means that this logger's
* effective level will be inherited from its parent.
*
* @return this Logger's level
*/
public Level getLevel() {
return levelObject;
}
/**
* Check if a message of the given level would actually be logged
* by this logger. This check is based on the Loggers effective level,
* which may be inherited from its parent.
*
* @param level a message logging level
* @return true if the given message level is currently being logged.
*/
public boolean isLoggable(Level level) {
if (level.intValue() < levelValue || levelValue == offValue) {
return false;
}
return true;
}
/**
* Get the name for this logger.
* @return logger name. Will be null for anonymous Loggers.
*/
public String getName() {
return name;
}
/**
* Add a log Handler to receive logging messages.
* <p>
* By default, Loggers also send their output to their parent logger.
* Typically the root Logger is configured with a set of Handlers
* that essentially act as default handlers for all loggers.
*
* @param handler a logging Handler
* @exception SecurityException if a security manager exists and if
* the caller does not have LoggingPermission("control").
*/
public synchronized void addHandler(Handler handler) throws SecurityException {
// Check for null handler
handler.getClass();
checkAccess();
if (handlers == null) {
handlers = new ArrayList();
}
handlers.add(handler);
}
/**
* Remove a log Handler.
* <P>
* Returns silently if the given Handler is not found or is null
*
* @param handler a logging Handler
* @exception SecurityException if a security manager exists and if
* the caller does not have LoggingPermission("control").
*/
public synchronized void removeHandler(Handler handler) throws SecurityException {
checkAccess();
if (handler == null) {
return;
}
if (handlers == null) {
return;
}
handlers.remove(handler);
}
/**
* Get the Handlers associated with this logger.
* <p>
* @return an array of all registered Handlers
*/
public synchronized Handler[] getHandlers() {
if (handlers == null) {
return emptyHandlers;
}
Handler result[] = new Handler[handlers.size()];
result = (Handler [])handlers.toArray(result);
return result;
}
/**
* Specify whether or not this logger should send its output
* to it's parent Logger. This means that any LogRecords will
* also be written to the parent's Handlers, and potentially
* to its parent, recursively up the namespace.
*
* @param useParentHandlers true if output is to be sent to the
* logger's parent.
* @exception SecurityException if a security manager exists and if
* the caller does not have LoggingPermission("control").
*/
public synchronized void setUseParentHandlers(boolean useParentHandlers) {
checkAccess();
this.useParentHandlers = useParentHandlers;
}
/**
* Discover whether or not this logger is sending its output
* to its parent logger.
*
* @return true if output is to be sent to the logger's parent
*/
public synchronized boolean getUseParentHandlers() {
return useParentHandlers;
}
// Private utility method to map a resource bundle name to an
// actual resource bundle, using a simple one-entry cache.
// Returns null for a null name.
// May also return null if we can't find the resource bundle and
// there is no suitable previous cached value.
private synchronized ResourceBundle findResourceBundle(String name) {
// Return a null bundle for a null name.
if (name == null) {
return null;
}
Locale currentLocale = Locale.getDefault();
// Normally we should hit on our simple one entry cache.
if (catalog != null && currentLocale == catalogLocale
&& name == catalogName) {
return catalog;
}
// Use the thread's context ClassLoader. If there isn't one,
// use the SystemClassloader.
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
cl = ClassLoader.getSystemClassLoader();
}
try {
catalog = ResourceBundle.getBundle(name, currentLocale, cl);
catalogName = name;
catalogLocale = currentLocale;
return catalog;
} catch (MissingResourceException ex) {
// Woops. We can't find the ResourceBundle in the default
// ClassLoader. Drop through.
}
// Fall back to searching up the call stack and trying each
// calling ClassLoader.
for (int ix = 0; ; ix++) {
Class clz = sun.reflect.Reflection.getCallerClass(ix);
if (clz == null) {
break;
}
ClassLoader cl2 = clz.getClassLoader();
if (cl2 == null) {
cl2 = ClassLoader.getSystemClassLoader();
}
if (cl == cl2) {
// We've already checked this classloader.
continue;
}
cl = cl2;
try {
catalog = ResourceBundle.getBundle(name, currentLocale, cl);
catalogName = name;
catalogLocale = currentLocale;
return catalog;
} catch (MissingResourceException ex) {
// Ok, this one didn't work either.
// Drop through, and try the next one.
}
}
if (name.equals(catalogName)) {
// Return the previous cached value for that name.
// This may be null.
return catalog;
}
// Sorry, we're out of luck.
return null;
}
// Private utility method to initialize our one entry
// resource bundle cache.
// Note: for consistency reasons, we are careful to check
// that a suitable ResourceBundle exists before setting the
// ResourceBundleName.
private synchronized void setupResourceInfo(String name) {
if (name == null) {
return;
}
ResourceBundle rb = findResourceBundle(name);
if (rb == null) {
// We've failed to find an expected ResourceBundle.
throw new MissingResourceException("Can't find " + name + " bundle", name, "");
}
resourceBundleName = name;
}
/**
* Return the parent for this Logger.
* <p>
* This method returns the nearest extant parent in the namespace.
* Thus if a Logger is called "a.b.c.d", and a Logger called "a.b"
* has been created but no logger "a.b.c" exists, then a call of
* getParent on the Logger "a.b.c.d" will return the Logger "a.b".
* <p>
* The result will be null if it is called on the root Logger
* in the namespace.
*
* @return nearest existing parent Logger
*/
public Logger getParent() {
synchronized (treeLock) {
return parent;
}
}
/**
* Set the parent for this Logger. This method is used by
* the LogManager to update a Logger when the namespace changes.
* <p>
* It should not be called from application code.
* <p>
* @param parent the new parent logger
* @exception SecurityException if a security manager exists and if
* the caller does not have LoggingPermission("control").
*/
public void setParent(Logger parent) {
if (parent == null) {
throw new NullPointerException();
}
manager.checkAccess();
doSetParent(parent);
}
// Private method to do the work for parenting a child
// Logger onto a parent logger.
private void doSetParent(Logger newParent) {
// System.err.println("doSetParent \"" + getName() + "\" \""
// + newParent.getName() + "\"");
synchronized (treeLock) {
// Remove ourself from any previous parent.
if (parent != null) {
// assert parent.kids != null;
for (Iterator iter = parent.kids.iterator(); iter.hasNext(); ) {
WeakReference ref = (WeakReference) iter.next();
Logger kid = (Logger) ref.get();
if (kid == this) {
iter.remove();
break;
}
}
// We have now removed ourself from our parents' kids.
}
// Set our new parent.
parent = newParent;
if (parent.kids == null) {
parent.kids = new ArrayList(2);
}
parent.kids.add(new WeakReference(this));
// As a result of the reparenting, the effective level
// may have changed for us and our children.
updateEffectiveLevel();
}
}
// Recalculate the effective level for this node and
// recursively for our children.
private void updateEffectiveLevel() {
// assert Thread.holdsLock(treeLock);
// Figure out our current effective level.
int newLevelValue;
if (levelObject != null) {
newLevelValue = levelObject.intValue();
} else {
if (parent != null) {
newLevelValue = parent.levelValue;
} else {
// This may happen during initialization.
newLevelValue = Level.INFO.intValue();
}
}
// If our effective value hasn't changed, we're done.
if (levelValue == newLevelValue) {
return;
}
levelValue = newLevelValue;
// System.err.println("effective level: \"" + getName() + "\" := " + level);
// Recursively update the level on each of our kids.
if (kids != null) {
for (int i = 0; i < kids.size(); i++) {
WeakReference ref = (WeakReference)kids.get(i);
Logger kid = (Logger) ref.get();
if (kid != null) {
kid.updateEffectiveLevel();
}
}
}
}
// Private method to get the potentially inherited
// resource bundle name for this Logger.
// May return null
private String getEffectiveResourceBundleName() {
Logger target = this;
while (target != null) {
String rbn = target.getResourceBundleName();
if (rbn != null) {
return rbn;
}
target = target.getParent();
}
return null;
}
}