[slf4j-dev] [GIT] SLF4J: Simple Logging Facade for Java branch master updated. v_1.6.4-11-g13f05d2
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- Log -----------------------------------------------------------------
http://git.qos.ch/gitweb/?p=slf4j.git;a=commit;h=13f05d200a898247b2a8d00b0ee82461ade2004e
http://github.com/ceki/slf4j/commit/13f05d200a898247b2a8d00b0ee82461ade2004e
commit 13f05d200a898247b2a8d00b0ee82461ade2004e
Author: Ceki Gulcu <ceki at qos.ch>
Date: Tue May 8 15:05:32 2012 +0200
added removeHandlersForRootLogger, updated javadocs
diff --git a/jul-to-slf4j/src/main/java/org/slf4j/bridge/SLF4JBridgeHandler.java b/jul-to-slf4j/src/main/java/org/slf4j/bridge/SLF4JBridgeHandler.java
index 783b3da..c69c9d0 100644
--- a/jul-to-slf4j/src/main/java/org/slf4j/bridge/SLF4JBridgeHandler.java
+++ b/jul-to-slf4j/src/main/java/org/slf4j/bridge/SLF4JBridgeHandler.java
@@ -39,53 +39,61 @@ import org.slf4j.spi.LocationAwareLogger;
// Based on http://bugzilla.slf4j.org/show_bug.cgi?id=38
/**
- * Bridge/route all JUL log records to the SLF4J API.
- *
- * <p>
- * Essentially, the idea is to install on the root logger an instance of
- * SLF4JBridgeHandler as the sole JUL handler in the system. Subsequently, the
+ * <p>Bridge/route all JUL log records to the SLF4J API.</p>
+ * <p>Essentially, the idea is to install on the root logger an instance of
+ * <code>SLF4JBridgeHandler</code> as the sole JUL handler in the system. Subsequently, the
* SLF4JBridgeHandler instance will redirect all JUL log records are redirected
* to the SLF4J API based on the following mapping of levels:
- *
+ * </p>
* <pre>
* FINEST -> TRACE
* FINER -> DEBUG
* FINE -> DEBUG
* INFO -> INFO
* WARNING -> WARN
- * SEVER -> ERROR
- * </pre>
- *
- * Usage:
- *
+ * SEVERE -> ERROR</pre>
+ * <p><b>Programmatic installation:</b></p>
+ * <pre>
+ * // Optionally remove existing handlers attached to j.u.l root logger
+ * SLF4JBridgeHandler.removeHandlersForRootLogger(); // (since SLF4J 1.6.5)
+
+ * // add SLF4JBridgeHandler to j.u.l's root logger, should be done once during
+ * // the initialization phase of your application
+ * SLF4JBridgeHandler.install();</pre>
+ * <p><b>Installation via <em>logging.properties</em> configuration file:</b></p>
+ * <pre>
+ * // register SLF4JBridgeHandler as handler for the j.u.l. root logger
+ * handlers = org.slf4j.bridge.SLF4JBridgeHandler</pre>
+ * <p>Once SLF4JBridgeHandler is installed, logging by j.u.l. loggers will be directed to
+ * SLF4J. Example: </p>
* <pre>
- * // call only once during initialization time of your application
- * SLF4JBridgeHandler.install();
- *
+ * import java.util.logging.Logger;
+ * ...
* // usual pattern: get a Logger and then log a message
- * java.util.logging.Logger julLogger = java.util.logging.Logger
- * .getLogger("org.wombat");
- * julLogger.fine("hello world"); // this will get redirected to SLF4J
- * </pre>
- *
- * <p>
- * Please note that translating a java.util.logging event into SLF4J incurs the
+ * Logger julLogger = Logger.getLogger("org.wombat");
+ * julLogger.fine("hello world"); // this will get redirected to SLF4J</pre>
+ *
+ * <p>Please note that translating a java.util.logging event into SLF4J incurs the
* cost of constructing {@link LogRecord} instance regardless of whether the
* SLF4J logger is disabled for the given level. <b>Consequently, j.u.l. to
- * SLF4J translation can seriously impact on the cost of disabled logging
- * statements (60 fold increase) and a measurable impact on enabled log
- * statements (20% overall increase). </b>
+ * SLF4J translation can seriously increase the cost of disabled logging
+ * statements (60 fold or 6000% increase) and measurably impact the performance of enabled log
+ * statements (20% overall increase).</b> Please note that as of logback-version 0.9.25,
+ * it is possible to completely eliminate the 60 fold translation overhead for disabled
+ * log statements with the help of <a href="http://logback.qos.ch/manual/configuration.html#LevelChangePropagator">LevelChangePropagator</a>.
* </p>
- *
- * <p>
- * If application performance is a concern, then use of SLF4JBridgeHandler is
- * appropriate only if few j.u.l. logging statements are in play.
- *
+ *
+ * <p>If you are concerned about application performance, then use of <code>SLF4JBridgeHandler</code>
+ * is appropriate only if any one the following two conditions is true:</p>
+ * <ol>
+ * <li>few j.u.l. logging statements are in play</li>
+ * <li>LevelChangePropagator has been installed</li>
+ * </ol>
+ *
* @author Christian Stein
* @author Joern Huxhorn
* @author Ceki Gülcü
* @author Darryl Smith
- *
* @since 1.5.1
*/
public class SLF4JBridgeHandler extends Handler {
@@ -101,30 +109,32 @@ public class SLF4JBridgeHandler extends Handler {
/**
* Adds a SLF4JBridgeHandler instance to jul's root logger.
- *
- * <p>
- * This handler will redirect jul logging to SLF4J. However, only logs enabled
+ * <p/>
+ * <p/>
+ * This handler will redirect j.u.l. logging to SLF4J. However, only logs enabled
* in j.u.l. will be redirected. For example, if a log statement invoking a
- * j.u.l. logger disabled that statement, by definition, will <em>not</em>
- * reach any SLF4JBridgeHandler instance and cannot be redirected.
+ * j.u.l. logger is disabled, then the corresponding non-event will <em>not</em>
+ * reach SLF4JBridgeHandler and cannot be redirected.
*/
public static void install() {
LogManager.getLogManager().getLogger("").addHandler(
- new SLF4JBridgeHandler());
+ new SLF4JBridgeHandler());
+ }
+
+ private static java.util.logging.Logger getRootLogger() {
+ return LogManager.getLogManager().getLogger("");
}
/**
* Removes previously installed SLF4JBridgeHandler instances. See also
* {@link #install()}.
- *
- * @throws SecurityException
- * A <code>SecurityException</code> is thrown, if a security manager
- * exists and if the caller does not have
- * LoggingPermission("control").
+ *
+ * @throws SecurityException A <code>SecurityException</code> is thrown, if a security manager
+ * exists and if the caller does not have
+ * LoggingPermission("control").
*/
public static void uninstall() throws SecurityException {
- java.util.logging.Logger rootLogger = LogManager.getLogManager().getLogger(
- "");
+ java.util.logging.Logger rootLogger = getRootLogger();
Handler[] handlers = rootLogger.getHandlers();
for (int i = 0; i < handlers.length; i++) {
if (handlers[i] instanceof SLF4JBridgeHandler) {
@@ -133,27 +143,38 @@ public class SLF4JBridgeHandler extends Handler {
}
}
- /**
- * Returns true if SLF4JBridgeHandler has been previously installed, returns false otherwise.
- * @return
- * @throws SecurityException
- */
- public static boolean isInstalled() throws SecurityException {
- java.util.logging.Logger rootLogger = LogManager.getLogManager().getLogger(
- "");
- Handler[] handlers = rootLogger.getHandlers();
- for (int i = 0; i < handlers.length; i++) {
- if (handlers[i] instanceof SLF4JBridgeHandler) {
- return true;
- }
- }
- return false;
+ /**
+ * Returns true if SLF4JBridgeHandler has been previously installed, returns false otherwise.
+ *
+ * @return
+ * @throws SecurityException
+ */
+ public static boolean isInstalled() throws SecurityException {
+ java.util.logging.Logger rootLogger = getRootLogger();
+ Handler[] handlers = rootLogger.getHandlers();
+ for (int i = 0; i < handlers.length; i++) {
+ if (handlers[i] instanceof SLF4JBridgeHandler) {
+ return true;
}
+ }
+ return false;
+ }
+
+ /**
+ * Invoking this method removes/unregisters/detaches all handlers currently attached to the root logger
+ * @since 1.6.5
+ */
+ public static void removeHandlersForRootLogger() {
+ java.util.logging.Logger rootLogger = getRootLogger();
+ java.util.logging.Handler[] handlers = rootLogger.getHandlers();
+ for (int i = 0; i < handlers.length; i++) {
+ rootLogger.removeHandler(handlers[i]);
+ }
+ }
/**
* Initialize this handler.
- *
*/
public SLF4JBridgeHandler() {
}
@@ -184,7 +205,7 @@ public class SLF4JBridgeHandler extends Handler {
}
protected void callLocationAwareLogger(LocationAwareLogger lal,
- LogRecord record) {
+ LogRecord record) {
int julLevelValue = record.getLevel().intValue();
int slf4jLevel;
@@ -219,9 +240,10 @@ public class SLF4JBridgeHandler extends Handler {
}
}
+
/**
* Get the record's message, possibly via a resource bundle.
- *
+ *
* @param record
* @return
*/
@@ -248,16 +270,15 @@ public class SLF4JBridgeHandler extends Handler {
/**
* Publish a LogRecord.
- * <p>
+ * <p/>
* The logging request was made initially to a Logger object, which
* initialized the LogRecord and forwarded it here.
- * <p>
+ * <p/>
* This handler ignores the Level attached to the LogRecord, as SLF4J cares
* about discarding log statements.
- *
- * @param record
- * Description of the log event. A null record is silently ignored
- * and is not published.
+ *
+ * @param record Description of the log event. A null record is silently ignored
+ * and is not published.
*/
public void publish(LogRecord record) {
// Silently ignore null records.
-----------------------------------------------------------------------
Summary of changes:
.../java/org/slf4j/bridge/SLF4JBridgeHandler.java | 155 +++++++++++---------
1 files changed, 88 insertions(+), 67 deletions(-)
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