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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.spi;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.Collections;
import java.util.Map;
import org.slf4j.MDC;
import org.slf4j.Marker;
import org.slf4j.helpers.MessageFormatter;
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.util.LogbackMDCAdapter;
import org.slf4j.spi.MDCAdapter;
/**
* The internal representation of logging events. When an affirmative decision
* is made to log then a LoggingEvent instance is created. This
* instance is passed around to the different logback-classic components.
*
*
* Writers of logback-classic components such as appenders should be aware of
* that some of the LoggingEvent fields are initialized lazily. Therefore, an
* appender wishing to output data to be later correctly read by a receiver,
* must initialize "lazy" fields prior to writing them out. See the
* {@link #prepareForDeferredProcessing()} method for the exact list.
*
*
* @author Ceki Gülcü
* @author Sébastien Pennec
*/
public class LoggingEvent implements ILoggingEvent {
/**
* Fully qualified name of the calling Logger class. This field does not
* survive serialization.
*
*
* Note that the getCallerInformation() method relies on this fact.
*/
transient String fqnOfLoggerClass;
/**
* The name of thread in which this logging event was generated.
*/
private String threadName;
private String loggerName;
private LoggerContext loggerContext;
private LoggerContextVO loggerContextVO;
/**
* Level of logging event.
*
*
* This field should not be accessed directly. You should use the
* {@link #getLevel} method instead.
*
*/
private transient Level level;
private String message;
// we gain significant space at serialization time by marking
// formattedMessage as transient and constructing it lazily in
// getFormattedMessage()
transient String formattedMessage;
private transient Object[] argumentArray;
private ThrowableProxy throwableProxy;
private StackTraceElement[] callerDataArray;
private Marker marker;
private Map mdcPropertyMap;
/**
* The number of milliseconds elapsed from 1/1/1970 until logging event was
* created.
*/
private long timeStamp;
public LoggingEvent() {
}
public LoggingEvent(String fqcn, Logger logger, Level level, String message, Throwable throwable, Object[] argArray) {
this.fqnOfLoggerClass = fqcn;
this.loggerName = logger.getName();
this.loggerContext = logger.getLoggerContext();
this.loggerContextVO = loggerContext.getLoggerContextRemoteView();
this.level = level;
this.message = message;
this.argumentArray = argArray;
if (throwable == null) {
throwable = extractThrowableAnRearrangeArguments(argArray);
}
if (throwable != null) {
this.throwableProxy = new ThrowableProxy(throwable);
LoggerContext lc = logger.getLoggerContext();
if (lc.isPackagingDataEnabled()) {
this.throwableProxy.calculatePackagingData();
}
}
timeStamp = System.currentTimeMillis();
}
private Throwable extractThrowableAnRearrangeArguments(Object[] argArray) {
Throwable extractedThrowable = EventArgUtil.extractThrowable(argArray);
if (EventArgUtil.successfulExtraction(extractedThrowable)) {
this.argumentArray = EventArgUtil.trimmedCopy(argArray);
}
return extractedThrowable;
}
public void setArgumentArray(Object[] argArray) {
if (this.argumentArray != null) {
throw new IllegalStateException("argArray has been already set");
}
this.argumentArray = argArray;
}
public Object[] getArgumentArray() {
return this.argumentArray;
}
public Level getLevel() {
return level;
}
public String getLoggerName() {
return loggerName;
}
public void setLoggerName(String loggerName) {
this.loggerName = loggerName;
}
public String getThreadName() {
if (threadName == null) {
threadName = (Thread.currentThread()).getName();
}
return threadName;
}
/**
* @param threadName The threadName to set.
* @throws IllegalStateException If threadName has been already set.
*/
public void setThreadName(String threadName) throws IllegalStateException {
if (this.threadName != null) {
throw new IllegalStateException("threadName has been already set");
}
this.threadName = threadName;
}
/**
* Returns the throwable information contained within this event. May be
* null if there is no such information.
*/
public IThrowableProxy getThrowableProxy() {
return throwableProxy;
}
/**
* Set this event's throwable information.
*/
public void setThrowableProxy(ThrowableProxy tp) {
if (throwableProxy != null) {
throw new IllegalStateException("ThrowableProxy has been already set.");
} else {
throwableProxy = tp;
}
}
/**
* This method should be called prior to serializing an event. It should also
* be called when using asynchronous or deferred logging.
*
*
* Note that due to performance concerns, this method does NOT extract caller
* data. It is the responsibility of the caller to extract caller information.
*/
public void prepareForDeferredProcessing() {
this.getFormattedMessage();
this.getThreadName();
// fixes http://jira.qos.ch/browse/LBCLASSIC-104
this.getMDCPropertyMap();
}
public LoggerContextVO getLoggerContextVO() {
return loggerContextVO;
}
public void setLoggerContextRemoteView(LoggerContextVO loggerContextVO) {
this.loggerContextVO = loggerContextVO;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
if (this.message != null) {
throw new IllegalStateException("The message for this event has been set already.");
}
this.message = message;
}
public long getTimeStamp() {
return timeStamp;
}
public void setTimeStamp(long timeStamp) {
this.timeStamp = timeStamp;
}
public void setLevel(Level level) {
if (this.level != null) {
throw new IllegalStateException("The level has been already set for this event.");
}
this.level = level;
}
/**
* Get the caller information for this logging event. If caller information is
* null at the time of its invocation, this method extracts location
* information. The collected information is cached for future use.
*
*
* Note that after serialization it is impossible to correctly extract caller
* information.
*
*/
public StackTraceElement[] getCallerData() {
if (callerDataArray == null) {
callerDataArray = CallerData
.extract(new Throwable(), fqnOfLoggerClass, loggerContext.getMaxCallerDataDepth(), loggerContext.getFrameworkPackages());
}
return callerDataArray;
}
public boolean hasCallerData() {
return (callerDataArray != null);
}
public void setCallerData(StackTraceElement[] callerDataArray) {
this.callerDataArray = callerDataArray;
}
public Marker getMarker() {
return marker;
}
public void setMarker(Marker marker) {
if (this.marker != null) {
throw new IllegalStateException("The marker has been already set for this event.");
}
this.marker = marker;
}
public long getContextBirthTime() {
return loggerContextVO.getBirthTime();
}
// lazy computation as suggested in LOGBACK-495
public String getFormattedMessage() {
if (formattedMessage != null) {
return formattedMessage;
}
if (argumentArray != null) {
formattedMessage = MessageFormatter.arrayFormat(message, argumentArray).getMessage();
} else {
formattedMessage = message;
}
return formattedMessage;
}
public Map getMDCPropertyMap() {
// populate mdcPropertyMap if null
if (mdcPropertyMap == null) {
MDCAdapter mdc = MDC.getMDCAdapter();
if (mdc instanceof LogbackMDCAdapter)
mdcPropertyMap = ((LogbackMDCAdapter) mdc).getPropertyMap();
else
mdcPropertyMap = mdc.getCopyOfContextMap();
}
// mdcPropertyMap still null, use emptyMap()
if (mdcPropertyMap == null)
mdcPropertyMap = Collections.emptyMap();
return mdcPropertyMap;
}
/**
* Set the MDC map for this event.
*
* @param map
* @since 1.0.8
*/
public void setMDCPropertyMap(Map map) {
if (mdcPropertyMap != null) {
throw new IllegalStateException("The MDCPropertyMap has been already set for this event.");
}
this.mdcPropertyMap = map;
}
/**
* Synonym for [@link #getMDCPropertyMap}.
*
* @deprecated Replaced by [@link #getMDCPropertyMap}
*/
public Map getMdc() {
return getMDCPropertyMap();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append('[');
sb.append(level).append("] ");
sb.append(getFormattedMessage());
return sb.toString();
}
/**
* LoggerEventVO instances should be used for serialization. Use
* {@link LoggingEventVO#build(ILoggingEvent) build} method to create the LoggerEventVO instance.
*
* @since 1.0.11
*/
private void writeObject(ObjectOutputStream out) throws IOException {
throw new UnsupportedOperationException(this.getClass() + " does not support serialization. "
+ "Use LoggerEventVO instance instead. See also LoggerEventVO.build method.");
}
}