net.snowflake.client.log.SFLoggerFactory Maven / Gradle / Ivy
/*
* Copyright (c) 2012-2017 Snowflake Computing Inc. All rights reserved.
*/
package net.snowflake.client.log;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
/**
* Used to create SFLogger instance
*
* Created by hyu on 11/17/16.
*/
public class SFLoggerFactory
{
public static LoggerImpl loggerImplementation;
enum LoggerImpl
{
SLF4JLOGGER("net.snowflake.client.log.SLF4JLogger"),
JDK14LOGGER("net.snowflake.client.log.JDK14Logger");
private String loggerImplClassName;
LoggerImpl(String loggerClass)
{
this.loggerImplClassName = loggerClass;
}
public String getLoggerImplClassName()
{
return this.loggerImplClassName;
}
public static LoggerImpl fromString(String loggerImplClassName)
{
if (loggerImplClassName != null)
{
for (LoggerImpl imp : LoggerImpl.values())
{
if (loggerImplClassName.equalsIgnoreCase(
imp.getLoggerImplClassName()))
{
return imp;
}
}
}
return null;
}
}
public static SFLogger getLogger(Class clazz)
{
// only need to determine the logger implementation only once
if (loggerImplementation == null)
{
String logger = System.getProperty("net.snowflake.jdbc.loggerImpl");
loggerImplementation = LoggerImpl.fromString(logger);
if (loggerImplementation == null) {
// try to load slf4j implementation class first
loggerImplementation = slf4jImplExist() ? LoggerImpl.SLF4JLOGGER
: LoggerImpl.JDK14LOGGER;
}
}
switch (loggerImplementation)
{
case SLF4JLOGGER:
return new SLF4JLogger(clazz);
case JDK14LOGGER:
default:
return new JDK14Logger(clazz.getName());
}
}
private static final String STATIC_LOGGER_BINDER_PATH="org/slf4j/impl/StaticLoggerBinder.class";
/**
* Methods used to determine if the slf4j implementation exist
* or not.
*
* The way to determine is to figure out if org.slf4j.StaticLoggerBinder
* is in the classpath or not. If not, then there is no implementation,
* switch to JDKLogger by default;
* @return
*/
private static boolean slf4jImplExist()
{
try
{
ClassLoader loggerFactoryClassLoader = SFLoggerFactory.class.getClassLoader();
Enumeration paths;
if (loggerFactoryClassLoader == null)
{
paths = ClassLoader.getSystemResources(STATIC_LOGGER_BINDER_PATH);
}
else
{
paths = loggerFactoryClassLoader.getResources(STATIC_LOGGER_BINDER_PATH);
}
return paths.hasMoreElements();
}
catch (IOException e)
{
System.err.println(e);
}
return false;
}
}