{"id":343,"date":"2015-08-17T03:09:53","date_gmt":"2015-08-17T03:09:53","guid":{"rendered":"http:\/\/ta.onionmixer.net\/wordpress\/?p=343"},"modified":"2015-08-20T08:09:48","modified_gmt":"2015-08-20T08:09:48","slug":"design-pattern-for-smalltalk-observer","status":"publish","type":"post","link":"http:\/\/ta.onionmixer.net\/wordpress\/?p=343","title":{"rendered":"Design Pattern for Smalltalk &#8211; Observer"},"content":{"rendered":"<p><a href=\"http:\/\/ta.onionmixer.net\/wordpress\/?attachment_id=344\" rel=\"attachment wp-att-344\"><img loading=\"lazy\" decoding=\"async\" class=\" size-full wp-image-344 aligncenter\" src=\"http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Observer_01.jpg\" alt=\"t_Dpsc_chapter05_Observer_01\" width=\"800\" height=\"322\" srcset=\"http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Observer_01.jpg 800w, http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Observer_01-480x193.jpg 480w, http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Observer_01-300x121.jpg 300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p>\ubaa8\ub4e0\uac83\uc774 \uac1d\uccb4(\ud074\ub798\uc2a4)\ub85c \uc774\ub8e8\uc5b4\uc838\uc788\ub294 Smalltalk \uac19\uc740 \uc2dc\uc2a4\ud15c\uc774\ub098 \uac1d\uccb4\uc9c0\ud5a5 \uc5b8\uc5b4\ub85c \ub9cc\ub4e4\uc5b4\uc9c4 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158\uc740, \uadf8 \ub0b4\ubd80\uc5d0 \uc218\ub9ce\uc740 \uac1d\uccb4\ub97c \uac00\uc9c0\uace0 \uc788\uac8c \ub41c\ub2e4. \ub2f9\uc5f0\ud788 \ubb3c\ub9ac\uc801\uc73c\ub85c \ubcf4\uc790\uba74 \ubc14\uc774\ub108\ub9ac(\uc774\uc9c4) \ub370\uc774\ud130\uc758 \ub098\uc5f4\uc5d0 \uc9c0\ub098\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0 \ube44-\uac1d\uccb4\uc9c0\ud5a5 \uc5b8\uc5b4\ub85c \ub9cc\ub4e4\uc5b4\uc9c4 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158\uacfc \ubcf8\uc9c8\uc801\uc778 \ucc28\uc774\ub294 \uc5c6\uc9c0\ub9cc, \uc5ec\uae30\uc11c\ub294 \ub17c\ub9ac\uc801\uc778 \uad6c\uc870\ub97c \ub2e4\ub8e8\uace0 \uc788\uc73c\ub2c8 \uadf8 \uc810\uc740 \ub118\uc5b4\uac00\ub3c4\ub85d \ud558\uc790. \uc5ec\ud2bc \uc774\ub807\uac8c \uc218\ub9ce\uc740 \uac1d\uccb4\uc0ac\uc774\uc5d0 \ud2b9\uc815 \uac1d\uccb4\ub97c \ubc14\ub77c\ubcf4\ub294 \uac1d\uccb4\ub97c B\ub77c\uace0 \ud558\uace0 \ud2b9\uc815 \uac1d\uccb4\ub97c A\ub77c\uace0 \uac00\uc815\ud558\uc790. A\uc758 \ub0b4\ubd80\uc5d0\uc11c \ubcc0\uc218\uc758 \ub0b4\uc6a9\uc774 \uac31\uc2e0\ub418\uc5c8\uc744 \ub54c \uc774 \ub0b4\uc6a9\uc744 B\uc5d0\uac8c \uc54c\ub824\uc918\uc57c \ud558\ub294 \uacbd\uc6b0\uac00 \ub418\uc5c8\ub2e4\uba74 \uc5b4\ub5bb\uac8c \ud574\uc57c\ud560\uae4c? \uadf8\ub9ac\uace0 \uc774 B\uac00 \ud55c\uac1c\uac00 \uc544\ub2c8\ub77c \ubcf5\uc218\ub85c \uc874\uc7ac\ud55c\ub2e4\uba74 A\ub294 \uc5b4\ub5bb\uac8c \ud574\uc57c\ud560\uae4c? observer\ud328\ud134\uc740 \uc774\ub7f0 \uacbd\uc6b0\ub97c \ud480\uc5b4\ub0b4\uae30 \uc704\ud574 \uace0\uc548\ub41c \ubc29\ubc95\uc774\ub2e4.<\/p>\n<p>\uac1d\uccb4\uc9c0\ud5a5\uc740 \uc0ac\ub78c\uc758 \uc0dd\uac01\uc744 \uae30\ubcf8 \ubaa8\ub378\ub85c \ud574\uc11c, \uc0dd\uac01\uc5d0\uc11c \uc774\ub8e8\uc5b4\uc9c0\ub294 \uad00\uacc4\ub97c \uccb4\uacc4\uc801\uc774\uace0 \ud6a8\uc728\uc801\uc73c\ub85c \uc815\ub9ac\ud574\uc11c \uad6c\ud604 \ubc0f \uc801\uc6a9\ud55c \ubc29\ubc95\uc774\ub2e4. \uadf8\ub807\uae30 \ub54c\ubb38\uc5d0 \uc774 \ud328\ud134 \uc5ed\uc2dc \uc0ac\ub78c\uacfc\uc758 \uad00\uacc4\uc5d0 \ube44\ucd94\uc5b4\uc11c \uc0dd\uac01 \ud574 \ubcf4\uba74 \uc870\uae08 \uc774\ud574\ud558\uae30 \uc26c\uc6b8\uac83\uc774\ub2e4. \ub098\ub294 \ubb34\uc5b8\uac00\ub97c \uac00\uc9c0\uace0 \uad00\ub9ac\ud558\ub294 \uc0ac\ub78c\uc774\uace0, \uc774\ub7f0 \ub098\uc640 \uad00\ub828\ub41c \uc5c5\ubb34\ub97c \ud558\ub294 \ub2e4\ub978\uc0ac\ub78c\uc774 \uc5ec\ub7ff \uc788\ub2e4\uace0 \uac00\uc815\ud558\uc790. \uc774 \ub54c \ub2e4\ub978 \uc0ac\ub78c\ub4e4\uc740 \ub0b4 \ubb34\uc5b8\uac00\uc758 \uc0c1\ud0dc\uac00 \ubcc0\ud654\ub420 \ub54c \uc601\ud5a5\uc744 \ubc1b\ub294 \uc5c5\ubb34\ub77c\uace0 \ud560 \ub54c \uc5b4\ub5bb\uac8c \ud574\uc57c \ud6a8\uc728\uc801\uc77c\uae4c.<\/p>\n<p>\ub2f9\uc5f0\ud788 \ub098\ub294 \ubb34\uc5b8\uac00\uc758 \uc0c1\ud0dc\ub97c \uad00\ub9ac\ud558\uba70 \ub2e4\ub978 \uc0ac\ub78c\uc5d0\uac8c \uc0c1\ud0dc\uc758 \ubcc0\ud654\ub97c \ud1b5\uc9c0\ud574\uc8fc\ub294\uac8c \uac00\uc7a5 \ud6a8\uc728\uc801\uc778 \ubc29\ubc95\uc774 \ub420 \uac83\uc774\ub2e4. \uc774 \ub54c\uc758 \ub098\ub97c subject\ub77c\uace0 \ud558\uace0 \ub2e4\ub978 \uc0ac\ub78c\uc744 observer\ub77c\uace0 \uc774\ud574\ud558\uba74 \ub41c\ub2e4.<\/p>\n<p>observer\ud328\ud134\uc758 \uc9c4\ud589\uc744 \uac04\ub2e8\ud558\uac8c \ubcf4\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n<p>1. data \uac1d\uccb4\uac00 \uc790\uc2e0\uc744 \ucc3d\uc870\ud558\ub294 \uac1d\uccb4\ub4e4\uc5d0\uac8c notification\uc744 \ubcf4\ub0b4\uc11c \uc790\uc2e0\uc758 \uc0c1\ud0dc\ubcc0\uacbd\uc744 \uc54c\ub9b0\ub2e4.<br \/>\n2. notification\uc744 \ubc1b\uc740 \uac1d\uccb4\ub294 data \uac1d\uccb4\ub0b4\uc5d0\uc11c \uac31\uc2e0\ub41c \uc790\ub8cc\ub97c \uac00\uc838\uc628\ub2e4.<\/p>\n<p>\uc774 \ub54c data\uac1d\uccb4\uac00 \uc790\uc2e0\uc744 \ucc38\uc870\ud558\ub294 \uac1d\uccb4\uc758 \ubaa9\ub85d\uc744 \uad00\ub9ac\ud55c\ub2e4\ub294 \uc810\uc5d0\uc11c\ub294 proxy \ud328\ud134\uc758 reference counter\uc640 \ud1b5\ud558\ub294 \ubd80\ubd84\ub3c4 \uc788\ub2e4.<\/p>\n<p><a href=\"http:\/\/ta.onionmixer.net\/wordpress\/?attachment_id=368\" rel=\"attachment wp-att-368\"><img loading=\"lazy\" decoding=\"async\" class=\" size-full wp-image-368 aligncenter\" src=\"http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_unnamed0.jpg\" alt=\"t_unnamed0\" width=\"480\" height=\"128\" srcset=\"http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_unnamed0.jpg 480w, http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_unnamed0-300x80.jpg 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/a><\/p>\n<p>data\uac1d\uccb4\ub97c \ucc38\uc870\ud558\ub294 \ucc38\uc870\uac1d\uccb4\uc758 \uc218\uac00 1 \uc774\uc0c1\uc77c \ub54c data \uac1d\uccb4\uc5d0 \ucd5c\ucd08\uc758 \ub370\uc774\ud130 \uc694\uccad\uc774 \uc624\uba74 data\uac1d\uccb4 \ub0b4\uc5d0\uc11c \ub370\uc774\ud130\ub97c \uce90\uc2f1\ud574\uc11c \uad00\ub9ac\ud558\uace0, \ucc38\uc870\uac1d\uccb4\uc758 \uc218\uac00 0\uc774\uba74 data\uc640 DB\uc758 \uc5f0\uacb0\uc744 \ub04a\uc5b4\uc11c \ub9ac\uc18c\uc2a4\uc758 \ub0ad\ube44\ub97c \uc904\uc77c \uc218\ub3c4 \uc788\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ubaa8\ub4e0\uac83\uc774 \uac1d\uccb4(\ud074\ub798\uc2a4)\ub85c \uc774\ub8e8\uc5b4\uc838\uc788\ub294 Smalltalk \uac19\uc740 \uc2dc\uc2a4\ud15c\uc774\ub098 \uac1d\uccb4\uc9c0\ud5a5 \uc5b8\uc5b4\ub85c \ub9cc\ub4e4\uc5b4\uc9c4 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158\uc740, \uadf8 \ub0b4\ubd80\uc5d0 \uc218\ub9ce\uc740 \uac1d\uccb4\ub97c \uac00\uc9c0\uace0 \uc788\uac8c \ub41c\ub2e4. \ub2f9\uc5f0\ud788 \ubb3c\ub9ac\uc801\uc73c\ub85c \ubcf4\uc790\uba74 \ubc14\uc774\ub108\ub9ac(\uc774\uc9c4) \ub370\uc774\ud130\uc758 \ub098\uc5f4\uc5d0 \uc9c0\ub098\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0 \ube44-\uac1d\uccb4\uc9c0\ud5a5 \uc5b8\uc5b4\ub85c \ub9cc\ub4e4\uc5b4\uc9c4 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158\uacfc \ubcf8\uc9c8\uc801\uc778 \ucc28\uc774\ub294 \uc5c6\uc9c0\ub9cc, \uc5ec\uae30\uc11c\ub294 \ub17c\ub9ac\uc801\uc778 \uad6c\uc870\ub97c \ub2e4\ub8e8\uace0 \uc788\uc73c\ub2c8 \uadf8 \uc810\uc740 \ub118\uc5b4\uac00\ub3c4\ub85d \ud558\uc790. \uc5ec\ud2bc \uc774\ub807\uac8c \uc218\ub9ce\uc740 \uac1d\uccb4\uc0ac\uc774\uc5d0 \ud2b9\uc815 \uac1d\uccb4\ub97c \ubc14\ub77c\ubcf4\ub294 \uac1d\uccb4\ub97c B\ub77c\uace0 \ud558\uace0 \ud2b9\uc815 \uac1d\uccb4\ub97c A\ub77c\uace0 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[74],"tags":[],"_links":{"self":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/343"}],"collection":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=343"}],"version-history":[{"count":3,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/343\/revisions"}],"predecessor-version":[{"id":370,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/343\/revisions\/370"}],"wp:attachment":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=343"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}