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Java SDK for ConfigCat, a feature flag, feature toggle, and configuration management service. That lets you launch new features and change your software configuration remotely without actually (re)deploying code. ConfigCat even helps you do controlled roll-outs like canary releases and blue-green deployments.

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package com.configcat;

/**
 * The Log Filter Functional Interface provides a custom filter option for the ConfigCat Logger.
 */
@FunctionalInterface
public interface LogFilterFunction {

    /**
     * Apply the custom filter option to the ConfigCatLogger.
     *
     * @param logLevel  Event severity level.
     * @param eventId  Event identifier.
     * @param message Message object. The formatted message String can be obtained by calling {@code toString}. (It is guaranteed that the message string is built only once even if {@code toString} called multiple times.)
     * @param exception The exception object related to the message (if any).
     * @return True to log the event, false will leave out the log.
     */
     boolean apply(LogLevel logLevel, int eventId, Object message, Throwable exception);
}