{"componentChunkName":"component---src-templates-post-template-jsx","path":"/history/posts/2020-11-14--002","result":{"data":{"site":{"siteMetadata":{"title":"Blog by Eunyoung","subtitle":"작업 기록 블로그","copyright":"© All rights reserved.","author":{"name":"EunYoung","twitter":"#"},"disqusShortname":"","url":"https://ssongey.github.io"}},"markdownRemark":{"id":"bda4e70f-6276-595d-b031-a0d494b3b672","html":"

스프링 없는 순수한 DI 컨테이너

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@Configuration\n  static class AppConfig {\n    @Bean\n    DataService dataService() {\n      return new DataServiceImpl();\n    }\n  }\n\n  @Test\n  @DisplayName(\"스프링 없는 순수한 DI 컨테이너\")\n  void pureContainer() {\n    AppConfig appConfig = new AppConfig();\n\n    // 호출시마다 객체를 생성\n    DataService dataService1 = appConfig.dataService();\n    DataService dataService2 = appConfig.dataService();\n\n    // 참조값이 다른 것을 확인\n    assertThat(dataService1).isNotSameAs(dataService2);\n  }
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싱글톤 컨테이너

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@Test\n  @DisplayName(\"스프링 컨테이너와 싱글톤\")\n  void springContainer() {\n    ApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);\n\n    DataService dataService1 = ac.getBean(\"dataService\", DataService.class);\n    DataService dataService2 = ac.getBean(\"dataService\", DataService.class);\n\n    // 참조값이 동일한 것을 확인\n    assertThat(dataService1).isSameAs(dataService2);\n  }
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싱글톤 방식의 주의점

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