java - SLF4J - how does it know which log type to use -

-

slf4j wrapper/facade class can use many different log types, such logback, log4j , etc. let's want use both logback , log4j , third java.util.logging. when write log this:

    public class helloworld {   public static void main(string[] args) {     logger logger = loggerfactory.getlogger(helloworld.class);     logger.info("hello world");   } }

how know logging framework using ? let's want use logback call, how know not using framework ?

as understood, slf4j interface , needs implementation. basically, slf4j call :

classloader.getsystemresources("org/slf4j/impl/staticloggerbinder.class");

it means classpath must contain such class qualified name.

every logging framework compatible slf4j defines such class.

  • if dig code of logback, find class named org.slf4j.impl.staticloggerbinder redirects logback's implementation
  • if dig code of log4j, there not such class there binding framework between log4j , slf4j called slf4j-log4j define class named org.slf4j.impl.staticloggerbinder redirects log4j's implementation.

so if want slf4j use particular framework, place accurate jar in classpath corresponding implementation of org.slf4j.impl.staticloggerbinder found.

here big picture (source : http://www.slf4j.org/manual.html) :

enter image description here


Comments

Post a Comment

Popular posts from this blog

Capture and play voice with Asterisk ARI -

-
there channel ari demo in wich can control channel state: ring, answer, play silence, play tone or audio-file ( https://github.com/asterisk/ari-examples/tree/master/channel-state , https://wiki.asterisk.org/wiki/display/ast/ari+and+channels%3a+manipulating+channel+state ) possible receive chunks (parts, buffers, etc.) of call voice (which created remote subscriber) or write chunks of voice, example array of bytes (not file) in audio format (alaw, ulow etc). you can use asterisk eagi interface voice data. other option use record or mixmonitor app record channel(channel have put stasis allow dialplan control ari) "write chunks of voice" can done application playback also can create own application using c/c++, compile asterisk , result want. no, can't redirect voice directly using ari.
Read more

c - Unrecognised emulation mode: elf_i386 on MinGW32 -

-
i'm trying make kernel, , cannot link c output assembly. ld . i'm getting error: unrecognized emulation mode: elf_i386 i'm using windows 10 professional mingw32 , msys. code using: link.ld /* * link.ld */ output_format(elf32-i386) entry(start) sections { . = 0x100000; .text : { *(.text) } .data : { *(.data) } .bss : { *(.bss) } } kernel.c /* * kernel.c */ void kmain(void) { const char *str = "my first kernel"; char *vidptr = (char*)0xb8000; //video mem begins here. unsigned int = 0; unsigned int j = 0; /* loops clears screen * there 25 lines each of 80 columns; each element takes 2 bytes */ while(j < 80 * 25 * 2) { /* blank character */ vidptr[j] = ' '; /* attribute-byte - light grey on black screen */ vidptr[j+1] = 0x07; j = j + 2; } j = 0; /* loop writes string video memory */ while(str[j] != '\0') { /...
Read more

magic numbers - Java's checkstyle, MagicNumberCheck -

-
i using checkstyle reportings source-code. question magicnumbercheck . i using date/(org.joda.)datetime in source code this: datetime datetime = new datetime(2013, 2, 27, 23, 0): datetime.plushours(57); is there way suppress magicnumbercheck notifications if magic number within date or datetime? you can use suppressioncommentfilter check this. configure properties values (in checkstyle configuration file) <module name="suppressioncommentfilter"> <property name="offcommentformat" value="check\:off\: ([\w\|]+)"/> <property name="oncommentformat" value="check\:on\: ([\w\|]+)"/> <property name="checkformat" value="$1"/> </module> now required lines, can like //check:off: magicnumber datetime datetime = new datetime(2013, 2, 27, 23, 0): datetime.plushours(57); //check:on: magicnumber this suppress magicnumber checks , rest checks work here. you can su...
Read more