Logging

As Javet is a fundamental SDK, it doesn't rely on any other libraries except JDK so that Javet users don't get dependency hell. That also means Javet has to use the JDK logging API, but Javet allows injecting 3rd party logging API.

Step 1: Implement IJavetLogger

IJavetLogger is the the only logging interface accepted by Javet. You may implement IJavetLogger with slf4j as following.

import com.caoccao.javet.interfaces.IJavetLogger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyJavetLogger implements IJavetLogger {
    protected Logger logger;

    public MyJavetLogger(String name) {
        logger = LoggerFactory.getLogger(name);
    }

    @Override
    public void debug(String message) {
        if (logger.isDebugEnabled()) {
            logger.debug(message);
        }
    }

    @Override
    public void error(String message) {
        if (logger.isDebugEnabled()) {
            logger.error(message);
        }
    }

    @Override
    public void error(String message, Throwable throwable) {
        if (logger.isDebugEnabled()) {
            logger.error(message, throwable);
        }
    }

    @Override
    public void info(String message) {
        if (logger.isInfoEnabled()) {
            logger.info(message);
        }
    }

    @Override
    public void warn(String message) {
        if (logger.isWarnEnabled()) {
            logger.warn(message);
        }
    }
}

Step 2: Inject the Logger

Injecting the logger is quite simple.

• Create an instance of the logger.

• Set the logger to a config.

• Set the config to a pool.

MyJavetLogger javetLogger = new MyJavetLogger("TestLogger");
JavetEngineConfig javetEngineConfig = new JavetEngineConfig();
javetEngineConfig.setJavetLogger(javetLogger);
JavetEnginePool javetEnginePool = new JavetEnginePool(javetEngineConfig);

Now, Javet is integrated into your logging system.