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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package elf4j.provider; | ||
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| import elf4j.Logger; | ||
| import elf4j.engine.service.LogServiceManager; | ||
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| import java.util.function.Supplier; | ||
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| public class Main { | ||
| static Logger logger = Logger.instance(); | ||
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| public static void main(String[] args) { | ||
| logger.atInfo().log("Hello, world!"); | ||
| Exception issue = new Exception("Test ex message"); | ||
| logger.atWarn().log(issue, "Testing issue '{}' in {}", issue, Main.class); | ||
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| logger.log( | ||
| "Logger instance is thread-safe so it can be declared and used as a local, instance, or static variable"); | ||
| logger.log("Default severity level is decided by the logging provider implementation"); | ||
| Logger trace = logger.atTrace(); | ||
| trace.log("Explicit severity level is specified by user i.e. TRACE"); | ||
| Logger.instance().atTrace().log("Same explicit level TRACE"); | ||
| logger.atDebug().log("Severity level is DEBUG"); | ||
| logger.atInfo().log("Severity level is INFO"); | ||
| trace.atWarn().log("Severity level is WARN, not TRACE"); | ||
| logger.atError().log("Severity level is ERROR"); | ||
| Logger.instance() | ||
| .atDebug() | ||
| .atError() | ||
| .atTrace() | ||
| .atWarn() | ||
| .atInfo() | ||
| .log("Not a practical example but the severity level is INFO"); | ||
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| Logger info = logger.atInfo(); | ||
| info.log("Message can have any number of arguments of {} type", Object.class.getTypeName()); | ||
| info.log( | ||
| "Lazy arguments, of {} type, whose values may be {} can be mixed with eager arguments of non-Supplier types", | ||
| Supplier.class.getTypeName(), | ||
| (Supplier) () -> "expensive to compute"); | ||
| info.atWarn() | ||
| .log("The Supplier downcast is mandatory per lambda syntax because arguments are declared as generic Object rather than functional interface"); | ||
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| Exception exception = new Exception("Exception message"); | ||
| logger.atError().log(exception); | ||
| logger.atError().log(exception, "Optional log message"); | ||
| logger.atInfo() | ||
| .log(exception, | ||
| "Exception is always the first argument to a logging method. The {} log message and following arguments work the same way {}.", | ||
| "optional", | ||
| (Supplier) () -> "as usual"); | ||
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| LogServiceManager.shutdown(); | ||
| } | ||
| } |
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