サーバーレスアーキテクチャでの Java 関数の監視とロギング

import java.util.logging.Logger;

public class MyFunction {
    private static final Logger logger = Logger.getLogger(MyFunction.class.getName());

    public void handleRequest(Object input, OutputStream output) {
        logger.info("This is an info log.");
        logger.warning("This is a warning log.");
        logger.severe("This is an error log.");
    }
}

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import java.util.logging.Logger;

public class MonitoredFunction implements RequestHandler<Object, Object> {
    private static final Logger logger = Logger.getLogger(MonitoredFunction.class.getName());

    @Override
    public Object handleRequest(Object input, Context context) {
        // 获取 Lambda 上下文，它包含执行时间和内存使用等指标
        long executionTime = context.getRemainingTimeInMillis();
        long memoryUsage = context.getMemoryLimitInMB();

        // 记录指标到 CloudWatch Logs
        logger.info("Execution time: " + executionTime);
        logger.info("Memory usage: " + memoryUsage);

        // 返回响应
        return "Hello from my monitored function!";
    }
}