Spring Framework - Dynamically registering beans Examples

package com.logicbig.example;

import java.util.Date;

public class MyBean {
    private Date date;

    public void doSomething() {
        System.out.println("from my bean, date: " + date);
    }

    public void setDate(Date date) {
        this.date = date;
    }
}

package com.logicbig.example;

import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.GenericBeanDefinition;

import java.util.Date;

public class GenericBeanDefinitionExample {

    public static void main(String[] args) {
        DefaultListableBeanFactory context =
                new DefaultListableBeanFactory();

        GenericBeanDefinition gbd = new GenericBeanDefinition();
        gbd.setBeanClass(MyBean.class);

        MutablePropertyValues mpv = new MutablePropertyValues();
        mpv.add("date", new Date());

        //alternatively we can use:
        // gbd.getPropertyValues().addPropertyValue("date", new Date());
        gbd.setPropertyValues(mpv);

        context.registerBeanDefinition("myBeanName", gbd);

        MyBean bean = context.getBean(MyBean.class);
        bean.doSomething();
    }
}

package com.logicbig.example;

public class MyBean {
    private String str;

    public void setStr(String str) {
        this.str = str;
    }

    public void doSomething() {
        System.out.println("from MyBean " + str);
    }
}

package com.logicbig.example;

import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;

public class BeanDefinitionBuilderExample {

    public static void main(String[] args) {
        DefaultListableBeanFactory beanFactory =
                new DefaultListableBeanFactory();

        BeanDefinitionBuilder b =
                BeanDefinitionBuilder.rootBeanDefinition(MyBean.class)
                        .addPropertyValue("str", "myStringValue");

        beanFactory.registerBeanDefinition("myBean", b.getBeanDefinition());

        MyBean bean = beanFactory.getBean(MyBean.class);
        bean.doSomething();
    }
}

package com.logicbig.example;

public class MyBean {
    private MyOtherBean otherBean;

    public void setOtherBean(MyOtherBean otherBean) {
        this.otherBean = otherBean;
    }

    public void doSomething() {
        otherBean.doSomething();
    }
}

package com.logicbig.example;

public class MyOtherBean {

    public void doSomething() {
        System.out.println("from other bean ");
    }
}

package com.logicbig.example;

import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.GenericBeanDefinition;

public class InjectingOtherBeans {

    public static void main(String[] args) {
        DefaultListableBeanFactory context =
                new DefaultListableBeanFactory();

        //define and register MyOtherBean
        GenericBeanDefinition beanOtherDef = new GenericBeanDefinition();
        beanOtherDef.setBeanClass(MyOtherBean.class);
        context.registerBeanDefinition("other", beanOtherDef);

        //define and register myBean
        GenericBeanDefinition beanDef = new GenericBeanDefinition();
        beanDef.setBeanClass(MyBean.class);
        MutablePropertyValues mpv = new MutablePropertyValues();
        mpv.addPropertyValue("otherBean", context.getBean("other"));
        beanDef.setPropertyValues(mpv);
        context.registerBeanDefinition("myBean", beanDef);

        //using MyBean instance
        MyBean bean = context.getBean(MyBean.class);
        bean.doSomething();
    }
}

package com.logicbig.example;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.beans.factory.support.GenericBeanDefinition;

public class MyBeanDefinitionRegistryPostProcessor
        implements BeanDefinitionRegistryPostProcessor {

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry)
            throws BeansException {

        GenericBeanDefinition bd = new GenericBeanDefinition();
        bd.setBeanClass(MyBean.class);
        bd.getPropertyValues().add("strProp", "my string property");
        registry.registerBeanDefinition("myBeanName", bd);
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
            throws BeansException {
        //no op
    }
}

package com.logicbig.example;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyConfig {
    @Bean
    public MyBeanDefinitionRegistryPostProcessor myConfigBean() {
        return new MyBeanDefinitionRegistryPostProcessor();
    }
}

package com.logicbig.example;

public class MyBean {
    private String strProp;

    public void setStrProp(String strProp) {
        this.strProp = strProp;
    }

    public void doSomething() {
        System.out.println("from MyBean:  " + strProp);
    }
}

package com.logicbig.example;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class BeanDefinitionRegistryPostProcessorExample {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(MyConfig.class);

        MyBean bean = (MyBean) context.getBean("myBeanName");
        bean.doSomething();
    }
}

package com.logicbig.example;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.GenericBeanDefinition;

public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    @Override
    public void postProcessBeanFactory(
            ConfigurableListableBeanFactory beanFactory)
            throws BeansException {

        GenericBeanDefinition bd = new GenericBeanDefinition();
        bd.setBeanClass(MyBean.class);
        bd.getPropertyValues().add("strProp", "my string property");

        ((DefaultListableBeanFactory) beanFactory)
                .registerBeanDefinition("myBeanName", bd);
    }
}

package com.logicbig.example;

public class MyBean {
    private String strProp;

    public void setStrProp(String strProp) {
        this.strProp = strProp;
    }

    public void doSomething() {
        System.out.println("from MyBean:  " + strProp);
    }
}

package com.logicbig.example;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyConfig {
    @Bean
   public static MyBeanFactoryPostProcessor myConfigBean() {
        return new MyBeanFactoryPostProcessor();
    }
}

package com.logicbig.example;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class BeanFactoryPostProcessorExample {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(MyConfig.class);
        MyBean bean = context.getBean(MyBean.class);
        bean.doSomething();
    }

}