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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.classic;
import static ch.qos.logback.core.CoreConstants.EVALUATOR_MAP;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledFuture;
import org.slf4j.ILoggerFactory;
import org.slf4j.Marker;
import ch.qos.logback.classic.spi.LoggerComparator;
import ch.qos.logback.classic.spi.LoggerContextListener;
import ch.qos.logback.classic.spi.LoggerContextVO;
import ch.qos.logback.classic.spi.TurboFilterList;
import ch.qos.logback.classic.turbo.TurboFilter;
import ch.qos.logback.classic.util.LoggerNameUtil;
import ch.qos.logback.core.ContextBase;
import ch.qos.logback.core.boolex.EventEvaluator;
import ch.qos.logback.core.spi.FilterReply;
import ch.qos.logback.core.spi.LifeCycle;
import ch.qos.logback.core.status.StatusListener;
import ch.qos.logback.core.status.StatusManager;
import ch.qos.logback.core.status.WarnStatus;
/**
* LoggerContext glues many of the logback-classic components together. In
* principle, every logback-classic component instance is attached either
* directly or indirectly to a LoggerContext instance. Just as importantly
* LoggerContext implements the {@link ILoggerFactory} acting as the
* manufacturing source of {@link Logger} instances.
*
* @author Ceki Gulcu
*/
public class LoggerContext extends ContextBase implements ILoggerFactory, LifeCycle {
/** Default setting of packaging data in stack traces */
public static final boolean DEFAULT_PACKAGING_DATA = false;
final Logger root;
private int size;
private int noAppenderWarning = 0;
final private List loggerContextListenerList = new ArrayList();
private Map loggerCache;
private LoggerContextVO loggerContextRemoteView;
private final TurboFilterList turboFilterList = new TurboFilterList();
private boolean packagingDataEnabled = DEFAULT_PACKAGING_DATA;
private int maxCallerDataDepth = ClassicConstants.DEFAULT_MAX_CALLEDER_DATA_DEPTH;
int resetCount = 0;
private List frameworkPackages;
public LoggerContext() {
super();
this.loggerCache = new ConcurrentHashMap();
this.loggerContextRemoteView = new LoggerContextVO(this);
this.root = new Logger(Logger.ROOT_LOGGER_NAME, null, this);
this.root.setLevel(Level.DEBUG);
loggerCache.put(Logger.ROOT_LOGGER_NAME, root);
initEvaluatorMap();
size = 1;
this.frameworkPackages = new ArrayList();
}
void initEvaluatorMap() {
putObject(EVALUATOR_MAP, new HashMap>());
}
/**
* A new instance of LoggerContextRemoteView needs to be created each time the
* name or propertyMap (including keys or values) changes.
*/
private void updateLoggerContextVO() {
loggerContextRemoteView = new LoggerContextVO(this);
}
@Override
public void putProperty(String key, String val) {
super.putProperty(key, val);
updateLoggerContextVO();
}
@Override
public void setName(String name) {
super.setName(name);
updateLoggerContextVO();
}
public final Logger getLogger(final Class clazz) {
return getLogger(clazz.getName());
}
@Override
public final Logger getLogger(final String name) {
if (name == null) {
throw new IllegalArgumentException("name argument cannot be null");
}
// if we are asking for the root logger, then let us return it without
// wasting time
if (Logger.ROOT_LOGGER_NAME.equalsIgnoreCase(name)) {
return root;
}
int i = 0;
Logger logger = root;
// check if the desired logger exists, if it does, return it
// without further ado.
Logger childLogger = (Logger) loggerCache.get(name);
// if we have the child, then let us return it without wasting time
if (childLogger != null) {
return childLogger;
}
// if the desired logger does not exist, them create all the loggers
// in between as well (if they don't already exist)
String childName;
while (true) {
int h = LoggerNameUtil.getSeparatorIndexOf(name, i);
if (h == -1) {
childName = name;
} else {
childName = name.substring(0, h);
}
// move i left of the last point
i = h + 1;
synchronized (logger) {
childLogger = logger.getChildByName(childName);
if (childLogger == null) {
childLogger = logger.createChildByName(childName);
loggerCache.put(childName, childLogger);
incSize();
}
}
logger = childLogger;
if (h == -1) {
return childLogger;
}
}
}
private void incSize() {
size++;
}
int size() {
return size;
}
/**
* Check if the named logger exists in the hierarchy. If so return its
* reference, otherwise returns null.
*
* @param name the name of the logger to search for.
*/
public Logger exists(String name) {
return (Logger) loggerCache.get(name);
}
final void noAppenderDefinedWarning(final Logger logger) {
if (noAppenderWarning++ == 0) {
getStatusManager().add(new WarnStatus("No appenders present in context [" + getName() + "] for logger [" + logger.getName() + "].", logger));
}
}
public List getLoggerList() {
Collection collection = loggerCache.values();
List loggerList = new ArrayList(collection);
Collections.sort(loggerList, new LoggerComparator());
return loggerList;
}
public LoggerContextVO getLoggerContextRemoteView() {
return loggerContextRemoteView;
}
public void setPackagingDataEnabled(boolean packagingDataEnabled) {
this.packagingDataEnabled = packagingDataEnabled;
}
public boolean isPackagingDataEnabled() {
return packagingDataEnabled;
}
/**
* This method clears all internal properties, except internal status messages,
* closes all appenders, removes any turboFilters, fires an OnReset event,
* removes all status listeners, removes all context listeners
* (except those which are reset resistant).
*
* As mentioned above, internal status messages survive resets.
*/
@Override
public void reset() {
resetCount++;
super.reset();
initEvaluatorMap();
initCollisionMaps();
root.recursiveReset();
resetTurboFilterList();
cancelScheduledTasks();
fireOnReset();
resetListenersExceptResetResistant();
resetStatusListeners();
}
private void cancelScheduledTasks() {
for(ScheduledFuture sf: scheduledFutures) {
sf.cancel(false);
}
scheduledFutures.clear();
}
private void resetStatusListeners() {
StatusManager sm = getStatusManager();
for (StatusListener sl : sm.getCopyOfStatusListenerList()) {
sm.remove(sl);
}
}
public TurboFilterList getTurboFilterList() {
return turboFilterList;
}
public void addTurboFilter(TurboFilter newFilter) {
turboFilterList.add(newFilter);
}
/**
* First processPriorToRemoval all registered turbo filters and then clear the registration
* list.
*/
public void resetTurboFilterList() {
for (TurboFilter tf : turboFilterList) {
tf.stop();
}
turboFilterList.clear();
}
final FilterReply getTurboFilterChainDecision_0_3OrMore(final Marker marker, final Logger logger, final Level level, final String format,
final Object[] params, final Throwable t) {
if (turboFilterList.size() == 0) {
return FilterReply.NEUTRAL;
}
return turboFilterList.getTurboFilterChainDecision(marker, logger, level, format, params, t);
}
final FilterReply getTurboFilterChainDecision_1(final Marker marker, final Logger logger, final Level level, final String format, final Object param,
final Throwable t) {
if (turboFilterList.size() == 0) {
return FilterReply.NEUTRAL;
}
return turboFilterList.getTurboFilterChainDecision(marker, logger, level, format, new Object[] { param }, t);
}
final FilterReply getTurboFilterChainDecision_2(final Marker marker, final Logger logger, final Level level, final String format, final Object param1,
final Object param2, final Throwable t) {
if (turboFilterList.size() == 0) {
return FilterReply.NEUTRAL;
}
return turboFilterList.getTurboFilterChainDecision(marker, logger, level, format, new Object[] { param1, param2 }, t);
}
// === start listeners ==============================================
public void addListener(LoggerContextListener listener) {
loggerContextListenerList.add(listener);
}
public void removeListener(LoggerContextListener listener) {
loggerContextListenerList.remove(listener);
}
private void resetListenersExceptResetResistant() {
List toRetain = new ArrayList();
for (LoggerContextListener lcl : loggerContextListenerList) {
if (lcl.isResetResistant()) {
toRetain.add(lcl);
}
}
loggerContextListenerList.retainAll(toRetain);
}
private void resetAllListeners() {
loggerContextListenerList.clear();
}
public List getCopyOfListenerList() {
return new ArrayList(loggerContextListenerList);
}
void fireOnLevelChange(Logger logger, Level level) {
for (LoggerContextListener listener : loggerContextListenerList) {
listener.onLevelChange(logger, level);
}
}
private void fireOnReset() {
for (LoggerContextListener listener : loggerContextListenerList) {
listener.onReset(this);
}
}
private void fireOnStart() {
for (LoggerContextListener listener : loggerContextListenerList) {
listener.onStart(this);
}
}
private void fireOnStop() {
for (LoggerContextListener listener : loggerContextListenerList) {
listener.onStop(this);
}
}
// === end listeners ==============================================
public void start() {
super.start();
fireOnStart();
}
public void stop() {
reset();
fireOnStop();
resetAllListeners();
super.stop();
}
@Override
public String toString() {
return this.getClass().getName() + "[" + getName() + "]";
}
public int getMaxCallerDataDepth() {
return maxCallerDataDepth;
}
public void setMaxCallerDataDepth(int maxCallerDataDepth) {
this.maxCallerDataDepth = maxCallerDataDepth;
}
/**
* List of packages considered part of the logging framework such that they are never considered
* as callers of the logging framework. This list used to compute the caller for logging events.
*
* To designate package "com.foo" as well as all its subpackages as being part of the logging framework, simply add
* "com.foo" to this list.
*
* @return list of framework packages
*/
public List getFrameworkPackages() {
return frameworkPackages;
}
}