package org.superbiz.cdi.produces.field;

public class ConsoleHandler implements LogHandler {

    private String name;

    public ConsoleHandler(String name) {
        this.name = name;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public void writeLog(String s) {
        System.out.printf("##### Handler: %s, Writing to the console!\n", getName());
    }
}

package org.superbiz.cdi.produces.field;

public class DatabaseHandler implements LogHandler {

    private String name;

    public DatabaseHandler(String name) {
        this.name = name;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public void writeLog(String s) {
        System.out.printf("##### Handler: %s, Writing to the database!\n", getName());
        // Use connection to write log to database
    }
}

package org.superbiz.cdi.produces.field;

public class FileHandler implements LogHandler {

    private String name;

    public FileHandler(String name) {
        this.name = name;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public void writeLog(String s) {
        System.out.printf("##### Handler: %s, Writing to the file!\n", getName());
        // Write to log file
    }
}

package org.superbiz.cdi.produces.field;

public interface Logger {

    public void log(String s);

    public LogHandler getHandler();
}

package org.superbiz.cdi.produces.field;

import javax.inject.Inject;
import javax.inject.Named;

@Named("logger")
public class LoggerImpl implements Logger {

    @Inject
    private LogHandler handler;

    @Override
    public void log(String s) {
        getHandler().writeLog(s);
    }

    public LogHandler getHandler() {
        return handler;
    }
}

package org.superbiz.cdi.produces.field;

public interface LogHandler {

    public String getName();

    public void writeLog(String s);
}

<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                            http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">

</beans>

package org.superbiz.cdi.produces.field;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import javax.ejb.embeddable.EJBContainer;
import javax.inject.Inject;
import javax.naming.Context;

import static junit.framework.Assert.assertNotNull;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

public class LoggerTest {

    @Inject
    Logger logger;

    private Context ctxt;

    @Before
    public void setUp() {
        try {
            ctxt = EJBContainer.createEJBContainer().getContext();
            ctxt.bind("inject", this);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @After
    public void cleanUp() {
        try {
            ctxt.unbind("inject");
            ctxt.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Test
    public void testLogHandler() {
        assertNotNull(logger);
        assertFalse("Handler should not be a ConsoleHandler", logger.getHandler() instanceof ConsoleHandler);
        assertFalse("Handler should not be a FileHandler", logger.getHandler() instanceof FileHandler);
        assertTrue("Handler should be a DatabaseHandler", logger.getHandler() instanceof DatabaseHandler);
        logger.log("##### Testing write\n");
        logger = null;
    }

}