內(nèi)容成果設(shè)計(jì)slf4j-in10slides

1、SLF4J projectCeki Glccekiqos.chJakarta Commons Logging (JCL)Same problem domainWell-established librarySo why do we re-invent the wheel?Because details of implementation matter.SLF4JSLF4J: Simple Logging Faade for JavaProblem definition:Abstract logging frameworksAutomatically/dynamically select und

2、erlying logging framework (in JCL)Manually/statically select underlying logging framework (in SLF4J)The API 1: import org.slf4j.Logger; 2: import org.slf4j.LoggerFactory; 3: 4: public class Wombat 5: 6: final Logger logger = LoggerFactory.getLogger(Wombat.class); 7: Integer t; 8: Integer oldT; 9:10:

3、 public void setTemperature(Integer temperature) 11: 12: oldT = t; 13: t = temperature;14:15: logger.debug(Temperature set to . Old temperature was ., t, oldT);16:17: if(Value() 50) 18: (Temperature has risen above 50 degrees.);19: 20: 21: Parameterized loggingold style: if(logger.isDebugEnabled() l

4、ogger.debug(Hello +name); new style: logger.debug(Hello , name);Other supported featuresMDC (for log4j, logback and j.u.l)Markers Bridging legacy systemsUsing SLF4J:Apache Archiva Apache Directory Apache FTPServer Apache Geronimo Apache Graffito Apache JetspeedApache Jackrabbit Apache Mina Apache Qp

5、id Apache Sling Apache Tapestry Apache WicketApertureApogee Artifactory Bitronix DbUnit Display tag GMaven GradleGreenMail GumTree H2 Database HA-JDBC Hibernate Igenko JabsorbJetty v6 jLynx JMesa JODConverterJTrac JWebUnit 2.x LIFERAY log4jdbc Magnolia MRCP4J Mindquarry Mugshot Mule Novocode NetCDF OpenRDF Penrose Proximity PZFileReader QuickFIX/J SMSJ Spring-OSGi StreamBase TimeFinder WTFIGO YASL Xooctory MigratorConclusionSimplicity is powerful. - Evan WilliamsRobustness, particularly in the context of logging, is a killer feature and simplicity implies