https://github.com/kwon37xi/slf4j-lambda

slf4j with Java 8 lambda
https://github.com/kwon37xi/slf4j-lambda

java java8 lambda logging slf4j

Last synced: about 1 month ago
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slf4j with Java 8 lambda

• Host: GitHub
• URL: https://github.com/kwon37xi/slf4j-lambda
• Owner: kwon37xi
• License: apache-2.0
• Created: 2017-07-10T12:23:35.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2021-09-02T13:46:07.000Z (over 3 years ago)
• Last Synced: 2025-03-28T02:46:15.575Z (about 2 months ago)
• Topics: java, java8, lambda, logging, slf4j
• Language: Java
• Size: 110 KB
• Stars: 24
• Watchers: 2
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Slf4j-Lambda

[![Maven Central](https://maven-badges.herokuapp.com/maven-central/kr.pe.kwonnam.slf4j-lambda/slf4j-lambda-core/badge.svg)](https://maven-badges.herokuapp.com/maven-central/kr.pe.kwonnam.slf4j-lambda/slf4j-lambda-core)

[Slf4j](https://www.slf4j.org/) logging with Java 8 lambda expressions.

The lambda expressions are evaluated only when the log level is enabled. 

## Requirements

* Java 8

* Slf4j API

## Dependencies

```

dependencies {

    implementation 'kr.pe.kwonnam.slf4j-lambda:slf4j-lambda-core:0.1'

}

```

## Usages

* Use `LambdaLoggerFactory` instread of Slf4j's `LoggerFactory`

* Use `LambdaLogger` instead of Slf4j's `Logger`. `LambdaLogger` inherits `Logger`, so you can still use all `Logger`'s logging methods with lambda supporting logging methods.

```java

import kr.pe.kwonnam.slf4jlambda.LambdaLogger;

import kr.pe.kwonnam.slf4jlambda.LambdaLoggerFactory;

LambdaLogger log = LambdaLoggerFactory.getLogger(YourClass.class);

// lambda for message itself

log.debug(() -> createMessage("debug level"));

// lambda for message format's arguments

log.info("info lambda formatter number {}, string {}", () -> 123, () -> "Hello LambdaLogger");

// method reference

public String longRunnigMethod() {

    return "some long running method";

}

log.debug("Long running method logging {}", this::longRunnigMethod);

// exception logging

log.error(() -> "error lambda exception msg - " + ex.getMessage(), ex);

```