예제 4-11 DisposableBean 인터페이스 구현([[disposable-bean]] DestructiveBeanWithInterface.java)

package com.apress.prospring5.ch4;

import java.io.File;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.support.GenericXmlApplicationContext;

public class DestructiveBeanWithInterface implements InitializingBean, DisposableBean {
    private File file;
    private String filePath;
    
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("빈을 초기화합니다.");

        if (filePath == null) {
            throw new IllegalArgumentException(
                DestructiveBeanWithInterface.class
                + "에 filePath 프로퍼티를 지정해야 합니다.");
        }

        this.file = new File(filePath);
        this.file.createNewFile();

        System.out.println("파일 존재 여부: " + file.exists());
    }

    @Override
    public void destroy() {
        System.out.println("빈을 소멸합니다.");

        if(!file.delete()) {
            System.err.println("에러: 파일 삭제에 실패했습니다.");
        }

        System.out.println("파일 존재 여부: " + file.exists());
    }

    public void setFilePath(String filePath) {
        this.filePath = filePath;
    }

    public static void main(String... args) throws Exception {
        GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
        ctx.load("classpath:spring/app-context-xml.xml");
        ctx.refresh(); 

        DestructiveBeanWithInterface bean = 
            (DestructiveBeanWithInterface) ctx.getBean("destructiveBean");

        System.out.println("destroy() 호출 시작");
        ctx.destroy();
        System.out.println("destroy() 호출 종료");
    }
}