CODEWITHSUNDEEP
javaspring
Kuldeep Yadav
Kuldeep Yadav

Reputation: 1816

Beans for third party library in spring-config.xml

I have a class looking like below 

@Component
public class BillDAO {

    private DynamoDBMapper dynamoDBMapper;

    public void create(BillDO billDO) {
        AmazonDynamoDBClientBuilder builder = AmazonDynamoDBClientBuilder.standard().withRegion(Regions.AP_SOUTH_1);
        DynamoDBMapper dynamoDBMapper = new DynamoDBMapper(builder.build());
        dynamoDBMapper.save(billDO);
    }
}

Basically, I don't want to construct dynamoDBMapper and builder instance every time I call the method create. Rather like to inject these as beans. What can be done?

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="com.tarkshala" />
</beans>

I did find few example which use constructor-arg for beans and factory-methods. Not sure how to use that here.

Upvotes: 0

Views: 1424

Answers (1)

Naveen Kumar
Naveen Kumar

Reputation: 973

You should be able to make use of @Configuration annotation to do this. Here is the code example of @Configuration implementation to create both AmazonDynamoDBClientBuilder & DynamoDBMapper as Spring beans.

package com.tarkshala;

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

@Configuration
public class ConfigurationAnnotationExample {

    @Bean
    public AmazonDynamoDBClientBuilder getAmazonDynamoDBClientBuilder() {
        return AmazonDynamoDBClientBuilder.standard().withRegion(Regions.AP_SOUTH_1);
    }

    @Bean
    public DynamoDBMapper getDynamoDBMapper(final AmazonDynamoDBClientBuilder builder) {
        return new DynamoDBMapper(builder.build());
    }
}

Here is your modified BillDAO to make use of injected DynamoDBMapper.

package com.tarkshala;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class BillDAO {

    private DynamoDBMapper dynamoDBMapper;

    @Autowired
    public BillDAO(final DynamoDBMapper dynamoDBMapper) {
        this.dynamoDBMapper = dynamoDBMapper;
    }

    public void create(BillDO billDO) {
        dynamoDBMapper.save(billDO);
    }
}

Since you already added the <context:component-scan base-package="com.tarkshala"/> in your application context xml, nothing more is required to create beans from ConfigurationAnnotationExample class.

Upvotes: 3

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