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Slf4j MDC详松



????MDC ???? Mapped Diagnostic Contexts????SLF4J????????????????????????????????????????????????????в?????????????????л???????????????????????MDC???Щ????????????????????????????

??????????????????????????????????Щ????????????????????????????????MDC?У?????????????????????????????д?????????????磺??????????е???????????? traceID ????????ε?????????rpcID??

?????????logback?й???MDC???????

????Most real-world distributed systems need to deal with multiple clients simultaneously. In a typical multithreaded implementation of such a system, different threads will handle different clients. A possible but slightly discouraged approach to differentiate the logging output of one client from another consists of instantiating a new and separate logger for each client. This technique promotes the proliferation of loggers and may increase their management overhead.

?????????????????????????????????ж?????????????????Ч?????????????????????弴?????????????????????????????????????????????????????????????ò?????????????????????????????????????????

????A lighter technique consists of uniquely stamping each log request servicing a given client. Neil Harrison described this method in the book Patterns for Logging Diagnostic Messages in Pattern Languages of Program Design 3, edited by R. Martin, D. Riehle, and F. Buschmann (Addison-Wesley, 1997). Logback leverages a variant of this technique included in the SLF4J API: Mapped Diagnostic Contexts (MDC).

?????????????????????????????????????????????????????????????Logback?????SLF4J API?а????????????Mapped Diagnostic Contexts (MDC)??

?????????MDC?????????

????If the underlying logging system offers MDC functionality, then SLF4J's MDC, i.e. this class, will delegate to the underlying system's MDC. Note that at this time, only two logging systems, namely log4j and logback, offer MDC functionality. For java.util.logging which does not support MDC, {@link BasicMDCAdapter} will be used. For other systems, i.e slf4j-simple and slf4j-nop, {@link NOPMDCAdapter} will be used.

《Slf4j MDC详松》

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