책 읽는 개발자

Behavioral Pattern인 Template Method Pattern에 대해 정리합니다. Definition Template Method 패턴은 상위 클래스에서 처리의 뼈대를 결정하고, 하위 클래스에서 그 구체적인 내용을 결정하는 디자인 패턴입니다. ※ OOP의 기본인 Abstraction 의 활용 예를 보여주는 대표적인 패턴입니다. Class Diagram AbstractClass는 탬플릿 메소드를 구현. ConcreteClass는 AbstractClass 역할에서 정의되어 있는 추상 메소드를 구체적으로 구현. Sample Case 다음은 Template Method 패턴을 적용한 시나리오입니다. Scenario 사람을 나타내는 AbstractHuman 추상 클래스가 있고, 이 때 speak(..

내가 코로나 백신을 접종하게 될 줄이야.. 나이상으로도 그렇고(나는 막 40), 시기상으로도 그렇고 백신 접종은 나중의 일이겠거니 생각하였는데, 뜬금 약 1주일 전에 30대이상 예비군/민방위를 대상으로 코로나 백신 예방접종이 가능했다. 하지만 백신은 얀센? 음...? 백신은 화이자, 모더나가 아닌 미국에서는 낮은 예방률(66.9%)과 혈전의 부작용 때문에 일부 접종 포기의사를 보인 얀센 백신이라는 말에 살짝 고개를 갸웃하기도 했지만, 이것도 없어서 못 맞는 사람들도 많고, 맞을 수 있을때 맞자? 는 심경이었다. ※ 참고로 얀센은 예방률은 타백신대비 낮은 편이지만, 중증 예방효과는 85%정도로 높은 편이고, 변이 바이러스에 강하다는 점은 참고할 만하다. 얼른 예약을 하였고 6/10일 목요일에 아침일찍 병원..

Behavioral Pattern의 첫 번째인 Interpreter Pattern에 대해 정리합니다. 외부에서 만들어놓은 미니 프로그램을 해석하여 실행하는 Interpreter 를 만들어봅시다. Definition Interpreter 패턴에서는 프로그램이 해결하려는 문제를 간단한 '미니 언어'로 표현합니다. Class Diagram Singleton class의 constructor가 private으로 되어 있습니다. ※ 그래서 외부에서 객체를 별도로 생성할 수 없습니다.(중요) member field인 singleton 역시 private으로 되어 있고 class가 memory에 로딩될 때 자신의 객체가 생성됩니다. 생성된 singleton 객체는 오직 getInstance()를 통해서만 참조 가능합..

Last night, I slept around 11:50PM. It was earlier than usual, but I still need to sleep earlier. Anyway I am feeling better than usual, because I got sleep more than usual. I took the shuttle bus going to the company. Today, the weather is cloudy. It seems that it will rain. And the temperature is higher than last week. Maybe summer is ccoming. I like summer, because I can do some activities th..

I got up late in the morning, but I took the shuttle bus that goes to the company. I need to sleep early. These days I have some concerns regarding my job and future. So I think I can't get sleep early and sleep well. I need to throw away my concers quickly. Anyhow I am having a meal at the restaurant in the company while writing a miracle morning log [SAVERS] silience - thinking nothing while t..

I got up early in the morning. I think it is too difficult to wake up early in the morning. These days I am feeling bad because of the inflammation on my nose and hands. So It is more difficult to wake up than usual. Anyhow, I could get to the company by the shuttle bus. So, I am having a meal while writing a log at the blog. Last night, I did free talking in English with my teacher. It is very ..

I woke up early in the morning. But I had to hurry for going out, because I had to take the shuttle bus. I need to get sleep early. Fortunatelly, I took the shuttle bus and went to the comapny. But I am a little bit sleepy. Yesterday I watched some scenamatic movie of Mortal Kombat game. It has a long history since I wan in an elementary school. It was so interesting, I had watched until late ti..

New week has begun. I got a rest during the weekend. Even though I need more rest, but I am feeling better. I got up late in the morning. So I went to the company by the subway. It was crowded with many people. But the weather was fine. I felt so good. When I got to the company, I had a small bread only, becaues soon I have a lunch time. Anyway I am writing a log at the blog, and I should cheer ..

I woke up early in the morning, It seems I got up around 6:40 AM. So I could take the shuttle bus and went to the company early. These days, I am not feeling well. I need to take care of myself well. Last night, I studied speaking English, but It is still hard to make a sentence. Especially, when I am tired, it seems my brain is not working. Anyhow, I am writing a log at the blog while having a ..

These days, I got up early in the morning and go to the company by the shuttle bus. I think this routine become my habit now. Yesterday, I wasn't feeling well. Because my inflammation on my hand mad me tired. After I took an antibiotic, I feel better now. I should take care of myself, even though there are a lot of things to do. Anyhow, I am writing a miracle morning log at the restaurant in the..