com.caucho.log.ELFormatter Maven / Gradle / Ivy
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/*
* Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.log;
import com.caucho.config.ConfigELContext;
import com.caucho.config.ConfigException;
import com.caucho.config.scope.ThreadRequestFactory;
import com.caucho.config.types.RawString;
import com.caucho.el.AbstractVariableResolver;
import com.caucho.el.ELParser;
import com.caucho.el.Expr;
import com.caucho.util.FreeList;
import com.caucho.util.L10N;
import javax.annotation.PostConstruct;
import javax.el.ELContext;
import javax.el.ELException;
import javax.servlet.http.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.LogRecord;
/**
* A Formatter that accepts an EL format string, and.
*/
public class ELFormatter extends MessageFormatter {
private static final L10N L = new L10N(ELFormatter.class);
private static final ThreadLocal _threadLogRecord
= new ThreadLocal();
private final FreeList _freeContextList
= new FreeList(8);
private String _format;
private Expr _expr;
public ELFormatter()
{
}
public void setFormat(RawString format)
{
_format = format.getValue();
}
public String getFormat()
{
return _format;
}
@PostConstruct
public void init()
throws ConfigException
{
if (_format != null) {
try {
ELParser elParser = new ELParser(new ConfigELContext(), _format);
_expr = elParser.parse();
} catch (Exception ex) {
throw ConfigException.create(ex);
}
}
}
public String format(LogRecord logRecord)
{
if (_expr == null) {
return super.format(logRecord);
}
String ret;
if (_expr == null) {
ret = super.format(logRecord);
}
else {
LogRecord oldLogRecord = _threadLogRecord.get();
try {
_threadLogRecord.set(logRecord);
ELContext context = _freeContextList.allocate();
if (context == null) {
ELFormatterVariableResolver vr = new ELFormatterVariableResolver();
context = new ConfigELContext(vr);
}
ret = _expr.evalString(context);
_freeContextList.free(context);
}
catch (RuntimeException ex) {
throw ex;
}
catch (Exception ex) {
throw new RuntimeException(ex);
}
finally {
_threadLogRecord.set(oldLogRecord);
}
}
return ret;
}
class ELFormatterVariableResolver extends AbstractVariableResolver {
private ELFormatterLogRecord _logRecord
= new ELFormatterLogRecord();
@Override
public Object getValue(ELContext env, Object base, Object property)
throws ELException
{
if (base != null || ! (property instanceof String))
return null;
if ("cookie".equals(property)) {
env.setPropertyResolved(true);
HttpServletRequest req = ThreadRequestFactory.getCurrentHttpRequest();
if (req != null) {
Cookie []cookies = req.getCookies();
if (cookies != null)
return new CookieMap(cookies);
}
return null;
}
else if ("log".equals(property)) {
env.setPropertyResolved(true);
return _logRecord;
}
else if ("request".equals(property)) {
env.setPropertyResolved(true);
return ThreadRequestFactory.getCurrentHttpRequest();
}
else if ("session".equals(property)) {
env.setPropertyResolved(true);
HttpServletRequest req = ThreadRequestFactory.getCurrentHttpRequest();
if (req != null) {
HttpSession session = req.getSession(false);
return session;
}
return null;
}
else if ("thread".equals(property)) {
env.setPropertyResolved(true);
return Thread.currentThread().getName();
}
return null;
}
}
/**
* An api similar to java.util.logging.LogRecord that provides more complete
* information for logging purposes.
*/
public class ELFormatterLogRecord
{
/**
* The "formatted" log message, after localization, substitution of
* parameters, and the inclusion of an exception stack trace if applicable.
*
* During formatting, if the source logger has a localization
* ResourceBundle and if that ResourceBundle has an entry for
* this message string, then the message string is replaced
* with the localized value.
*
* If the message has parameters, java.text.MessageFormat is used to format
* the message with the parameters.
*
* If the log record has an associated exception, the stack trace is
* appended to the log message.
*
* @see java.text.MessageFormat
* @see java.lang.Throwable.printStackTrace()
*/
public String getMessage()
{
return formatMessage(getLogRecord());
}
/**
* The source Logger's name.
*
* @return source logger name, which may be null
*/
public String getName()
{
return getLogRecord().getLoggerName();
}
/**
* The source Logger's name.
*
* @return source logger name, which may be null
*/
public String getLoggerName()
{
return getLogRecord().getLoggerName();
}
/**
* The last component of the source Logger's name. The last component
* is everything that occurs after the last `.' character, usually
* it is the class name.
*
*
* @return short version of the source logger name, or null
*/
public String getShortName()
{
String name = getLogRecord().getLoggerName();
if (name != null) {
int index = name.lastIndexOf('.') + 1;
if (index > 0 && index < name.length()) {
name = name.substring(index);
}
}
return name;
}
/**
* The logging message level, for example Level.INFO.
*
* @see java.util.logging.Level
*/
public Level getLevel()
{
return getLogRecord().getLevel();
}
/**
* The time of the logging event, in milliseconds since 1970.
*/
public long getMillis()
{
return getLogRecord().getMillis();
}
/**
* An identifier for the thread where the message originated.
*/
public int getThreadID()
{
return getLogRecord().getThreadID();
}
/**
* The throwable associated with the log record, if one was associated.
*/
public Throwable getThrown()
{
return getLogRecord().getThrown();
}
/**
* The sequence number, normally assigned in the constructor of LogRecord.
*/
public long getSequenceNumber()
{
return getLogRecord().getSequenceNumber();
}
/**
* The name of the class that issued the logging request.
* This name may be unavailable, or not actually the name of the class that
* issued the logging message.
*/
public String getSourceClassName()
{
return getLogRecord().getSourceClassName();
}
/**
* The last component of the name (everthing after the last `.') of the
* class that issued the logging request.
* This name may be unavailable, or not actually the name of the class that
* issued the logging message.
*
* @return short version of the sourceClassName
*/
public String getShortSourceClassName()
{
String name = getLogRecord().getSourceClassName();
if (name != null) {
int index = name.lastIndexOf('.') + 1;
if (index > 0 && index < name.length()) {
name = name.substring(index);
}
}
return name;
}
/**
* The name of the method that issued the logging request. This name
* may be unavailable, or not actually the name of the class that issued
* the logging message.
*/
public String getSourceMethodName()
{
return getLogRecord().getSourceMethodName();
}
/**
* The "raw" log message, before localization or substitution
* of parameters.
*
* This returned message will be either the final text, text containing
* parameter substitution "format elements" (like `{0}') for use by
* java.text.MessageFormat, or a localization key.
*
* @see java.text.MessageFormat
*/
public String getRawMessage()
{
return getLogRecord().getMessage();
}
/**
* The resource bundle for localization.
*/
public ResourceBundle getResourceBundle()
{
return getLogRecord().getResourceBundle();
}
/**
* The name of resource bundle for localization.
*/
public String getResourceBundleName()
{
return getLogRecord().getResourceBundleName();
}
public Object[] getParameters()
{
return getLogRecord().getParameters();
}
private LogRecord getLogRecord()
{
return _threadLogRecord.get();
}
}
public static class CookieMap extends AbstractMap {
private Cookie []_cookies;
CookieMap(Cookie []cookies)
{
_cookies = cookies;
}
public Object get(Object key)
{
for (Cookie cookie : _cookies) {
if (cookie.getName().equals(key))
return cookie;
}
return null;
}
public int size()
{
return _cookies.length;
}
public Set entrySet()
{
return null;
}
}
}