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The AWS Lambda Java Runtime Interface Client implements the Lambda programming model for Java

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/* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. */

package com.amazonaws.services.lambda.runtime.api.client.logging;

import com.amazonaws.services.lambda.runtime.api.client.api.LambdaContext;
import com.amazonaws.services.lambda.runtime.logging.LogFormat;
import com.amazonaws.services.lambda.runtime.logging.LogLevel;

import static java.nio.charset.StandardCharsets.UTF_8;

public class LambdaContextLogger extends AbstractLambdaLogger {
    // If a null string is passed in, replace it with "null",
    // replicating the behavior of System.out.println(null);
    private static final byte[] NULL_BYTES_VALUE = "null".getBytes(UTF_8);

    private final transient LogSink sink;

    public LambdaContextLogger(LogSink sink, LogLevel logLevel, LogFormat logFormat) {
        super(logLevel, logFormat);
        this.sink = sink;
    }

    @Override
    protected void logMessage(byte[] message, LogLevel logLevel) {
        if (message == null) {
            message = NULL_BYTES_VALUE;
        }
        sink.log(logLevel, this.logFormat, message);
    }
}