[ https://jira.qos.ch/browse/SLF4J-371?page=com.atlassian.jira.plugin.system.i... ] Federico Fissore commented on SLF4J-371: ---------------------------------------- An initial effort to support lambdas in slf4j 2.0 has been discussed in the mailing list and resulted in this PR [https://github.com/qos-ch/slf4j/pull/203] If you wish to use the same api with the _current_ version of slf4j, you want to take a look at https://github.com/ffissore/slf4j-fluent

Support the lambda expression in the Logger -------------------------------------------

Key: SLF4J-371 URL: https://jira.qos.ch/browse/SLF4J-371 Project: SLF4J Issue Type: Improvement Components: Core API Affects Versions: 1.7.22 Reporter: MiNG Assignee: SLF4J developers list

In some cases, we don't want to calculate the expression for logging eagerly cause the performance reason. Then, we would write the code like the following: {code:java} if (LOGGER.isWarnEnabled()) {  LOGGER.warn("some message: {}", Json.serialize(obj)); }{code} Before JDK8, there is no way to encapsulate the above code, because the expression is always calculated before passed as an argument. So, many "if"s appear in the code and smell badly. Now, the lambda expression is supported by JDK8, the above could be simplified like following: {code:java} LOGGER.warn(formatter -> formatter.format("some message: {}", Json.serialize(obj)));{code} With the default method definition in the org.slf4j.Logger: {code:java} public interface Logger {  default void warn(Function<MessageFormatter, String> messageSupplier)  {   if (this.isWarnEnabled())   {    /* Calculate the expression only if the WARN level logging is enabled. */    this.warn(messageSupplier.apply(this.getFormatter()));   }  } }{code}

-- This message was sent by Atlassian JIRA (v7.3.1#73012)