/* Copyright (c) 2001-2014, The HSQL Development Group
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*
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* list of conditions and the following disclaimer.
*
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package org.hsqldb.lib;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;
/**
* A logging framework wrapper that supports java.util.logging and log4j.
* <P/>
* Logger hierarchies are stored at the Class level.
* Log4j will be used if the Log4j system (not necessarily config files) are
* found in the runtime classpath.
* Otherwise, java.util.logging will be used.
* <P/>
* This is pretty safe because for use cases where multiple hierarchies
* are desired, classloader hierarchies will effectively isolate multiple
* class-level Logger hierarchies.
* <P/>
* Sad as it is, the java.util.logging facility lacks the most basic
* developer-side and configuration-side capabilities.
* Besides having a non-scalable discovery system, the designers didn't
* comprehend the need for a level between WARNING and SEVERE!
* Since we don't want to require log4j in Classpath, we have to live
* with these constraints.
* <P/>
* As with all the popular logging frameworks, if you want to capture a
* stack trace, you must use the two-parameters logging methods.
* I.e., you must also pass a String, or only toString() from your
* throwable will be captured.
* <P/>
* Usage example:<CODE><PRE>
* private static FrameworkLogger logger =
* FrameworkLogger.getLog(SqlTool.class);
* ...
* logger.finer("Doing something log-worthy");
* </PRE> </CODE>
*
* <p/>
* The system level property <code>hsqldb.reconfig_logging=false</code> is
* required to avoid configuration of java.util.logging. Otherwise
* configuration takes place.<p/>
*
* @author Blaine Simpson (blaine dot simpson at admc dot com)
* @version 2.3.1
* @since 1.9.0
*/
public class FrameworkLogger {
/*
* FrameworkLogger coders: It would be convenient to be able to log
* states and such at debug level in this class.
* I tentatively think that using a logger instance early in the static
* lifecycle is too risky, possibly using the underlying plumbing before
* the application has had a chance to customize, and perhaps before
* classloaders have been re-prioritized, etc.
* Could be that it all works out ok, but make sure you consider all
* situations before logging with FrameworkLogger instances here.
* This is one reason why there are a couple uses of System.err below.
*/
/**
* Utility method for integrators.
* Returns a string representation of the active Logger instance keys.
* <p>
* Not named similar to 'toString' to avoid ambiguity with instance method
* toString.
* </p>
*/
public static synchronized String report() {
return new StringBuilder().append(loggerInstances.size()).append(
" logger instances: ").append(
loggerInstances.keySet()).toString();
}
static private Map loggerInstances = new HashMap();
static private Map jdkToLog4jLevels = new HashMap();
static private Method log4jGetLogger;
static private Method log4jLogMethod;
private Object log4jLogger;
private Logger jdkLogger;
// No need for more than one static, since we have only one console
static private boolean noopMode; // If true, then logging calls do nothing
static {
try {
reconfigure();
} catch (java.lang.SecurityException e) {}
}
/**
* Frees Logger(s), if any, with the specified category, or that begins with
* the specified prefix + dot.
* <p>
* Note that as of today, this depends on the underlying logging framework
* implementation to release the underlying Logger instances.
* JUL in Sun's JVM uses weak references, so that should be fine.
* Log4j as of today seems to use strong references (and no API hooks to
* free anything), so this method will probably have little benefit for
* Log4j.
* </p>
*/
public static synchronized void clearLoggers(String prefixToZap) {
Set targetKeys = new HashSet();
java.util.Iterator it = loggerInstances.keySet().iterator();
String k;
String dottedPrefix = prefixToZap + '.';
while (it.hasNext()) {
k = (String) it.next();
if (k.equals(prefixToZap) || k.startsWith(dottedPrefix)) {
targetKeys.add(k);
}
}
loggerInstances.keySet().removeAll(targetKeys);
}
static void reconfigure() {
noopMode = false;
Class log4jLoggerClass = null;
loggerInstances.clear();
log4jLoggerClass = null;
log4jGetLogger = null;
log4jLogMethod = null;
try {
log4jLoggerClass = Class.forName("org.apache.log4j.Logger");
} catch (Exception e) {
// The class will only load successfully if Log4j thinks it is
// in usable state.
// Intentionally empty.
}
// Try log4j first so we can fall back to JUL if anything goes wrong.
if (log4jLoggerClass != null) {
try {
if (jdkToLog4jLevels.size() < 1) {
Method log4jToLevel = Class.forName(
"org.apache.log4j.Level").getMethod(
"toLevel", new Class[]{ String.class });
jdkToLog4jLevels.put(Level.ALL,
log4jToLevel.invoke(null,
new Object[]{ "ALL" }));
jdkToLog4jLevels.put(Level.FINER,
log4jToLevel.invoke(null,
new Object[]{ "DEBUG" }));
jdkToLog4jLevels.put(Level.WARNING,
log4jToLevel.invoke(null,
new Object[]{ "ERROR" }));
jdkToLog4jLevels.put(Level.SEVERE,
log4jToLevel.invoke(null,
new Object[]{ "FATAL" }));
jdkToLog4jLevels.put(Level.INFO,
log4jToLevel.invoke(null,
new Object[]{ "INFO" }));
jdkToLog4jLevels.put(Level.OFF,
log4jToLevel.invoke(null,
new Object[]{ "OFF" }));
jdkToLog4jLevels.put(Level.FINEST,
log4jToLevel.invoke(null,
new Object[]{ "TRACE" }));
jdkToLog4jLevels.put(Level.WARNING,
log4jToLevel.invoke(null,
new Object[]{ "WARN" }));
}
log4jLogMethod = log4jLoggerClass.getMethod("log",
new Class[] {
String.class, Class.forName("org.apache.log4j.Priority"),
Object.class, Throwable.class
});
log4jGetLogger = log4jLoggerClass.getMethod("getLogger",
new Class[]{ String.class });
// This last object is what we toggle on to generate either
// Log4j or Jdk Logger objects (to wrap).
return; // Success for Log4j
} catch (Exception e) {
// This is an unexpected problem, because our Log4j try block will
// only be attempted if Log4j itself initialized (even if it
// successfully initialized with warnings due to bad config).
try {
System.err.println(
"<clinit> failure "
+ "instantiating configured Log4j system: " + e);
// It's possible we don't have write access to System.err.
} catch (Throwable t) {
// Intentionally empty. We tried our best to report problem,
// but don't want to throw and prevent JUL from working.
}
}
}
log4jLoggerClass = null;
log4jLogMethod = null;
log4jGetLogger = null;
String propVal = System.getProperty("hsqldb.reconfig_logging");
if (propVal != null && propVal.equalsIgnoreCase("false")) {
return;
}
InputStream istream = null;
try {
LogManager lm = LogManager.getLogManager();
String path =
"/org/hsqldb/resources/jdklogging-default.properties";
if (isDefaultJdkConfig()) {
lm.reset();
ConsoleHandler consoleHandler = new ConsoleHandler();
consoleHandler.setFormatter(
new BasicTextJdkLogFormatter(false));
consoleHandler.setLevel(Level.INFO);
istream = FrameworkLogger.class.getResourceAsStream(path);
lm.readConfiguration(istream);
Logger cmdlineLogger = Logger.getLogger("org.hsqldb.cmdline");
cmdlineLogger.addHandler(consoleHandler);
cmdlineLogger.setUseParentHandlers(false);
} else {
// Do not intervene. Use JDK logging exactly as configured
// by user.
lm.readConfiguration();
// The only bad thing about doing this is that if the app
// has programmatically changed the logging config after
// starting the program but before using FrameworkLogger,
// we will clobber those customizations.
// Set sys srop 'hsqldb.reconfig_logging' to false to
// prevent this.
}
} catch (Exception e) {
noopMode = true;
System.err.println(
"<clinit> failure initializing JDK logging system. "
+ "Continuing without Application logging.");
e.printStackTrace();
} finally {
if (istream != null) try {
istream.close();
} catch (IOException ioe) {
System.err.println(
"Failed to close logging input stream: " + ioe);
}
}
}
/**
* User may not use the constructor.
*/
private FrameworkLogger(String s) {
if (!noopMode) {
if (log4jGetLogger == null) {
jdkLogger = Logger.getLogger(s);
} else {
try {
log4jLogger = log4jGetLogger.invoke(null,
new Object[]{ s });
} catch (Exception e) {
throw new RuntimeException(
"Failed to instantiate Log4j Logger", e);
}
}
}
synchronized (FrameworkLogger.class) {
loggerInstances.put(s, this);
}
}
/**
* User's entry-point into this logging system.
* <P/>
* You normally want to work with static (class-level) pointers to
* logger instances, for performance efficiency.
* See the class-level JavaDoc for a usage example.
*
* @see FrameworkLogger
*/
public static FrameworkLogger getLog(Class c) {
return getLog(c.getName());
}
/**
* This method just defers to the getLog(Class) method unless default
* (no local configuration) JDK logging is being used;
* In that case, this method assures that the returned logger has an
* associated FileHander using the supplied String identifier.
*/
public static FrameworkLogger getLog(Class c, String contextId) {
return (contextId == null) ? getLog(c)
: getLog(contextId + '.' + c.getName());
}
/**
* This method just defers to the getLog(String) method unless default
* (no local configuration) JDK logging is being used;
* In that case, this method assures that the returned logger has an
* associated FileHander using the supplied String identifier.
*/
public static FrameworkLogger getLog(String baseId, String contextId) {
return (contextId == null) ? getLog(baseId)
: getLog(contextId + '.' + baseId);
}
/**
* Alternative entry-point into this logging system, for cases where
* you want to share a single logger instance among multiple classes,
* or you want to use multiple logger instances from a single class.
*
* @see #getLog(Class)
*/
public static synchronized FrameworkLogger getLog(String s) {
if (loggerInstances.containsKey(s)) {
return (FrameworkLogger) loggerInstances.get(s);
}
return new FrameworkLogger(s);
}
/**
* Just like FrameworkLogger.log(Level, String),
* but also logs a stack trace.
*
* @param level java.util.logging.Level level to filter and log at
* @param message Message to be logged
* @param t Throwable whose stack trace will be logged.
* @see #log(Level, String)
* @see Logger#log(Level, String)
* @see Level
*/
public void log(Level level, String message, Throwable t) {
privlog(level, message, t, 2, FrameworkLogger.class);
}
/**
* The "priv" prefix is historical.
* This is for special usage when you need to modify the reported call
* stack.
* If you don't know that you want to do this, then you should not use
* this method.
*/
public void privlog(Level level, String message, Throwable t,
int revertMethods, Class skipClass) {
if (noopMode) {
return;
}
if (log4jLogger == null) {
StackTraceElement elements[] = new Throwable().getStackTrace();
String c = elements[revertMethods].getClassName();
String m = elements[revertMethods].getMethodName();
if (t == null) {
jdkLogger.logp(level, c, m, message);
} else {
jdkLogger.logp(level, c, m, message, t);
}
} else {
try {
log4jLogMethod.invoke(log4jLogger, new Object[] {
skipClass.getName(), jdkToLog4jLevels.get(level), message,
t
});
} catch (Exception e) {
throw new RuntimeException(
"Logging failed when attempting to log: " + message, e);
}
}
}
public void enduserlog(Level level, String message) {
/* This method is SqlTool-specific, which is where this class began at.
* Need to move this back there, but it needs access to the logging
* structures private to this class. Thinking...
*/
if (noopMode) {
return;
}
if (log4jLogger == null) {
String c = FrameworkLogger.class.getName();
String m = "\\l";
jdkLogger.logp(level, c, m, message);
} else {
try {
log4jLogMethod.invoke(log4jLogger, new Object[] {
FrameworkLogger.class.getName(),
jdkToLog4jLevels.get(level), message, null
});
// Test where SqlFile correct here.
} catch (Exception e) {
throw new RuntimeException(
"Logging failed when attempting to log: " + message, e);
}
}
}
// Wrappers
/**
* @param level java.util.logging.Level level to filter and log at
* @param message Message to be logged
* @see Logger#log(Level, String)
* @see Level
*/
public void log(Level level, String message) {
privlog(level, message, null, 2, FrameworkLogger.class);
}
/**
* @param message Message to be logged
* @see Logger#finer(String)
*/
public void finer(String message) {
privlog(Level.FINER, message, null, 2, FrameworkLogger.class);
}
/**
* @param message Message to be logged
* @see Logger#warning(String)
*/
public void warning(String message) {
privlog(Level.WARNING, message, null, 2, FrameworkLogger.class);
}
/**
* @param message Message to be logged
* @see Logger#severe(String)
*/
public void severe(String message) {
privlog(Level.SEVERE, message, null, 2, FrameworkLogger.class);
}
/**
* @param message Message to be logged
* @see Logger#info(String)
*/
public void info(String message) {
privlog(Level.INFO, message, null, 2, FrameworkLogger.class);
}
/**
* @param message Message to be logged
* @see Logger#finest(String)
*/
public void finest(String message) {
privlog(Level.FINEST, message, null, 2, FrameworkLogger.class);
}
/**
* This is just a wrapper for FrameworkLogger.warning(), because
* java.util.logging lacks a method for this critical purpose.
*
* @param message Message to be logged
* @see #warning(String)
*/
public void error(String message) {
privlog(Level.WARNING, message, null, 2, FrameworkLogger.class);
}
/**
* Just like FrameworkLogger.finer(String), but also logs a stack trace.
*
* @param t Throwable whose stack trace will be logged.
* @see #finer(String)
*/
public void finer(String message, Throwable t) {
privlog(Level.FINER, message, t, 2, FrameworkLogger.class);
}
/**
* Just like FrameworkLogger.warning(String), but also logs a stack trace.
*
* @param t Throwable whose stack trace will be logged.
* @see #warning(String)
*/
public void warning(String message, Throwable t) {
privlog(Level.WARNING, message, t, 2, FrameworkLogger.class);
}
/**
* Just like FrameworkLogger.severe(String), but also logs a stack trace.
*
* @param t Throwable whose stack trace will be logged.
* @see #severe(String)
*/
public void severe(String message, Throwable t) {
privlog(Level.SEVERE, message, t, 2, FrameworkLogger.class);
}
/**
* Just like FrameworkLogger.info(String), but also logs a stack trace.
*
* @param t Throwable whose stack trace will be logged.
* @see #info(String)
*/
public void info(String message, Throwable t) {
privlog(Level.INFO, message, t, 2, FrameworkLogger.class);
}
/**
* Just like FrameworkLogger.finest(String), but also logs a stack trace.
*
* @param t Throwable whose stack trace will be logged.
* @see #finest(String)
*/
public void finest(String message, Throwable t) {
privlog(Level.FINEST, message, t, 2, FrameworkLogger.class);
}
/**
* Just like FrameworkLogger.error(String), but also logs a stack trace.
*
* @param t Throwable whose stack trace will be logged.
* @see #error(String)
*/
public void error(String message, Throwable t) {
privlog(Level.WARNING, message, t, 2, FrameworkLogger.class);
}
/**
* Whether this JVM is configured with java.util.logging defaults.
*
* If the JRE-provided config file is not in the expected place, then
* we return false.
*/
public static boolean isDefaultJdkConfig() {
File globalCfgFile = new File(System.getProperty("java.home"),
"lib/logging.properties");
if (!globalCfgFile.isFile()) {
return false;
}
FileInputStream fis = null;
LogManager lm = LogManager.getLogManager();
try {
fis = new FileInputStream(globalCfgFile);
Properties defaultProps = new Properties();
defaultProps.load(fis);
Enumeration names = defaultProps.propertyNames();
int i = 0;
String name;
String liveVal;
while (names.hasMoreElements()) {
i++;
name = (String) names.nextElement();
liveVal = lm.getProperty(name);
if (liveVal == null) {
return false;
}
if (!lm.getProperty(name).equals(liveVal)) {
return false;
}
}
return true;
} catch (IOException ioe) {
return false;
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException ioe) {
// Intentional no-op
}
}
}
}
}