{"componentChunkName":"component---node-modules-narative-gatsby-theme-novela-src-templates-article-template-tsx","path":"/garbage-collection-(-)","result":{"pageContext":{"article":{"id":"e9aa9c50-3431-5e71-b5f2-994b7f0a4074","slug":"/garbage-collection-(-)","secret":false,"title":"Garbage Collection (가비지 컬렉션)","author":"Reno Kim","date":"December 23rd, 2020","dateForSEO":"2020-12-23T00:00:00.000Z","timeToRead":2,"excerpt":"가비지 컬렉션에 대해 공부한 내용을 정리하였습니다.","canonical_url":null,"subscription":true,"body":"function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nfunction _objectWithoutProperties(source, excluded) { if (source == null) return {}; var target = _objectWithoutPropertiesLoose(source, excluded); var key, i; if (Object.getOwnPropertySymbols) { var sourceSymbolKeys = Object.getOwnPropertySymbols(source); for (i = 0; i < sourceSymbolKeys.length; i++) { key = sourceSymbolKeys[i]; if (excluded.indexOf(key) >= 0) continue; if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue; target[key] = source[key]; } } return target; }\n\nfunction _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys[i]; if (excluded.indexOf(key) >= 0) continue; target[key] = source[key]; } return target; }\n\n/* @jsxRuntime classic */\n\n/* @jsx mdx */\nvar _frontmatter = {\n  \"title\": \"Garbage Collection (가비지 컬렉션)\",\n  \"author\": \"Reno Kim\",\n  \"date\": \"2020-12-23T00:00:00.000Z\",\n  \"hero\": \"./images/hero.jpg\",\n  \"excerpt\": \"가비지 컬렉션에 대해 공부한 내용을 정리하였습니다.\"\n};\nvar layoutProps = {\n  _frontmatter: _frontmatter\n};\nvar MDXLayout = 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Type\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"Method Parameter \\uC218\\uC640 Type\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"Method modifier (public / private / protected / static / final / syncronized / native / abstract)Method \\uAD6C\\uD604 \\uBD80\\uBD84\\uC774 \\uC788\\uC744 \\uACBD\\uC6B0 ( abstract \\uB610\\uB294 native \\uAC00 \\uC544\\uB2D0 \\uACBD\\uC6B0 )\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"Method\\uC758 byteCode\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"Method\\uC758 Stack Frame\\uC758 Operand Stack \\uBC0F Local variable section\\uC758 \\uD06C\\uAE30\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"Exception Table\"))), mdx(\"li\", {\n    parentName: \"ol\"\n  }, mdx(\"strong\", {\n    parentName: \"li\"\n  }, \"Class Variable (static \\uD0A4\\uC6CC\\uB4DC\\uB85C \\uC120\\uC5B8\\uB41C \\uBCC0\\uC218)\"), mdx(\"ul\", {\n    parentName: \"li\"\n  }, mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"\\uBAA8\\uB4E0 \\uC778\\uC2A4\\uD134\\uC2A4\\uC5D0 \\uACF5\\uC720 \\uB418\\uBA70 \\uC778\\uC2A4\\uD134\\uC2A4\\uAC00 \\uC5C6\\uC5B4\\uB3C4 \\uC9C1\\uC811 \\uC811\\uADFC\\uC774 \\uAC00\\uB2A5\\uD558\\uB2E4.\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"\\uC774 \\uBCC0\\uC218\\uB294 \\uC778\\uC2A4\\uD134\\uC2A4\\uC758 \\uAC83\\uC774 \\uC544\\uB2C8\\uB77C \\uD074\\uB798\\uC2A4\\uC5D0 \\uC18D\\uD558\\uAC8C \\uB41C\\uB2E4.\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"\\uD074\\uB798\\uC2A4\\uB97C \\uC0AC\\uC6A9 \\uD558\\uAE30 \\uC774\\uC804\\uC5D0 \\uC774 \\uBCC0\\uC218\\uB4E4\\uC740 \\uBBF8\\uB9AC \\uBA54\\uBAA8\\uB9AC\\uB97C \\uD560\\uB2F9 \\uBC1B\\uC544 \\uC788\\uB294 \\uC0C1\\uD0DC\\uAC00 \\uB41C\\uB2E4.\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"final class \\uBCC0\\uC218\\uB294 \\uC0C1\\uC218\\uB85C \\uCE58\\uD658 \\uB418\\uC5B4 Runtime Constant Pool\\uC5D0 \\uAC12\\uC744 \\uBCF5\\uC0AC\\uD55C\\uB2E4.\"))))))), mdx(\"li\", {\n    parentName: \"ul\"\n  }, mdx(\"strong\", {\n    parentName: \"li\"\n  }, \"Heap Area:\"), \"\\xA0new \\uBA85\\uB839\\uC5B4\\uB85C \\uC0DD\\uC131\\uB41C \\uC778\\uC2A4\\uD134\\uC2A4\\uC640 \\uAC1D\\uCCB4\\uAC00 \\uC800\\uC7A5\\uB418\\uB294 \\uAD6C\\uC5ED(Garbage Collection \\uC774\\uC288\\uB294 \\uC774 \\uC601\\uC5ED\\uC5D0\\uC11C \\uC77C\\uC5B4\\uB098\\uBA70, \\uBAA8\\uB4E0 Thread\\uAC00 \\uACF5\\uC720)\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, mdx(\"strong\", {\n    parentName: \"li\"\n  }, \"Stack Area:\"), \"\\xA0Method \\uB0B4\\uC5D0\\uC11C \\uC0AC\\uC6A9\\uB418\\uB294 \\uAC12\\uB4E4(\\uB9E4\\uAC1C\\uBCC0\\uC218, \\uC9C0\\uC5ED\\uBCC0\\uC218, \\uB9AC\\uD134\\uAC12 \\uB4F1)\\uC774 \\uC800\\uC7A5\\uB418\\uB294 \\uAD6C\\uC5ED\\uC73C\\uB85C \\uBA54\\uC18C\\uB4DC\\uAC00 \\uD638\\uCD9C\\uB420\\uB54C LIFO\\uB85C \\uD558\\uB098\\uC529 \\uC0DD\\uC131\\uB418\\uACE0, \\uBA54\\uC18C\\uB4DC \\uC2E4\\uD589\\uC774 \\uC644\\uB8CC\\uB418\\uBA74 LIFO\\uB85C \\uD558\\uB098\\uC529 \\uC9C0\\uC6CC\\uC9C4\\uB2E4. (\\uAC01 Thread\\uBCC4\\uB85C \\uD558\\uB098\\uC529 \\uC0DD\\uC131)\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, mdx(\"strong\", {\n    parentName: \"li\"\n  }, \"PC Register:\"), \"\\xA0CPU\\uC758 Register\\uC640 \\uC5ED\\uD560\\uC774 \\uBE44\\uC2B7\\uD558\\uB2E4. \\uD604\\uC7AC \\uC218\\uD589 \\uC911\\uC778 JVM \\uBA85\\uB839\\uC758 \\uC8FC\\uC18C \\uAC12\\uC774 \\uC800\\uC7A5\\uB41C\\uB2E4. (\\uAC01 Thread\\uBCC4\\uB85C \\uD558\\uB098\\uC529 \\uC0DD\\uC131)\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, mdx(\"strong\", {\n    parentName: \"li\"\n  }, \"Native Method Stack:\"), \"\\xA0\\uB2E4\\uB978 \\uC5B8\\uC5B4(C/C++\\xA0\\uB4F1)\\uC758 \\uBA54\\uC18C\\uB4DC \\uD638\\uCD9C\\uC744 \\uC704\\uD574 \\uD560\\uB2F9\\uB418\\uB294 \\uAD6C\\uC5ED\\uC73C\\uB85C \\uC5B8\\uC5B4\\uC5D0 \\uB9DE\\uAC8C Stack\\uC774 \\uD615\\uC131\\uB418\\uB294 \\uAD6C\\uC5ED\\uC774\\uB2E4\")), mdx(\"p\", null, mdx(\"strong\", {\n    parentName: \"p\"\n  }, \"\\uD504\\uB85C\\uADF8\\uB7A8 \\uCE74\\uC6B4\\uD130(Program counter, PC)\"), \" \\uB294 \\uB9C8\\uC774\\uD06C\\uB85C\\uD504\\uB85C\\uC138\\uC11C(\\uC911\\uC559 \\uCC98\\uB9AC \\uC7A5\\uCE58) \\uB0B4\\uBD80\\uC5D0 \\uC788\\uB294 \\uB808\\uC9C0\\uC2A4\\uD130 \\uC911\\uC758 \\uD558\\uB098\\uB85C\\uC11C, \\uB2E4\\uC74C\\uC5D0 \\uC2E4\\uD589\\uB420 \\uBA85\\uB839\\uC5B4\\uC758 \\uC8FC\\uC18C\\uB97C \\uAC00\\uC9C0\\uACE0 \\uC788\\uC5B4 \\uC2E4\\uD589\\uD560 \\uAE30\\uACC4\\uC5B4 \\uCF54\\uB4DC\\uC758 \\uC704\\uCE58\\uB97C \\uC9C0\\uC815\\uD55C\\uB2E4. \\uB54C\\uBB38\\uC5D0 \\u201C\\uBA85\\uB839\\uC5B4 \\uD3EC\\uC778\\uD130\\u201D \\uB77C\\uACE0\\uB3C4 \\uD55C\\uB2E4.\"), mdx(\"h2\", {\n    \"id\": \"jvm-heap-structure\"\n  }, \"JVM Heap Structure\"), mdx(\"p\", null, mdx(\"img\", _extends({\n    parentName: \"p\"\n  }, {\n    \"src\": \"https://t1.daumcdn.net/cfile/tistory/99423C425BC7564C1D\",\n    \"alt\": \"image2\"\n  }))), mdx(\"hr\", null), mdx(\"h1\", {\n    \"id\": \"garbage-collection-hotspot-jvm\"\n  }, \"Garbage Collection (Hotspot JVM)\"), mdx(\"h2\", {\n    \"id\": \"정의\"\n  }, \"\\uC815\\uC758\"), mdx(\"blockquote\", null, mdx(\"p\", {\n    parentName: \"blockquote\"\n  }, \"The garbage collector (GC) automatically manages the application\\u2019s dynamic memory allocation requests.\")), mdx(\"h2\", {\n    \"id\": \"역할\"\n  }, mdx(\"strong\", {\n    parentName: \"h2\"\n  }, \"\\uC5ED\\uD560\")), mdx(\"ul\", null, mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"\\uD799(heap) \\uB0B4\\uC758 \\uAC1D\\uCCB4 \\uC911\\uC5D0\\uC11C \\uAC00\\uBE44\\uC9C0(garbage)\\uB97C \\uCC3E\\uC544\\uB0B8\\uB2E4\"), mdx(\"li\", {\n    parentName: \"ul\"\n  }, \"\\uCC3E\\uC544\\uB0B8 \\uAC00\\uBE44\\uC9C0\\uB97C \\uCC98\\uB9AC\\uD574\\uC11C \\uD799\\uC758 \\uBA54\\uBAA8\\uB9AC\\uB97C \\uD68C\\uC218\\uD55C\\uB2E4\")), mdx(\"h2\", {\n    \"id\": \"gc-알고리즘\"\n  }, \"GC \\uC54C\\uACE0\\uB9AC\\uC998\"), mdx(\"h3\", {\n    \"id\": \"gc-root\"\n  }, \"GC Root\"), mdx(\"blockquote\", null, mdx(\"p\", {\n    parentName: \"blockquote\"\n  }, \"GC\\uB97C \\uC704\\uD55C \\uD2B9\\uBCC4\\uD55C \\uAC1D\\uCCB4\\n\\uAC1D\\uCCB4\\uAC00 \\uC0B4\\uC544\\uC788\\uC74C\\uC744 \\uBCF4\\uC7A5\\uD55C\\uB2E4\")), mdx(\"p\", null, \"ex) Class, Thread, Stack Local, JNI Local, JNI Global, Monitor Used, Held by JVM\"), mdx(\"p\", null, mdx(\"img\", _extends({\n    parentName: \"p\"\n  }, {\n    \"src\": 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adjustmentList \\uB97C \\uC0AC\\uC6A9\\uD574\\uC57C \\uD55C\\uB2E4\\uBA74 ?? ==> Hell\\n    fun applyAdjustmentToEngine() {\\n        val brightness = getEngineValue(AdjustmentType.BRIGHTNESS)\\n        val contrast = getEngineValue(AdjustmentType.CONTRAST)\\n        val saturation = getEngineValue(AdjustmentType.SATURATION)\\n\\n        println(\\\"apply adjustment brightness: $brightness\\\")\\n        println(\\\"apply adjustment contrast: $contrast\\\")\\n        println(\\\"apply adjustment saturation: $saturation\\\")\\n    }\\n\\n    private fun getFactor(type: AdjustmentType): Float\\n            = adjustmentList.find { it.type == type }?.factor ?: 0f\\n\\n    private fun getEngineValue(type: AdjustmentType): Float\\n            = getFactor(type) * 255f\\n}\\n\\n//Before Refactoring\\nclass Adjustment(\\n    //factor range : 0f ~ 1.0f\\n    var factor: Float,\\n    val type: AdjustmentType\\n) {\\n\\n    companion object {\\n        fun newAdjustment(): List<Adjustment> = AdjustmentType.values().map { Adjustment(0.5f, it) }\\n    }\\n}\\n\\nenum class AdjustmentType {\\n    BRIGHTNESS,\\n    CONTRAST,\\n    SATURATION\\n}\\n\")), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-kotlin\"\n  }), \"// After\\n\\nclass ClipAfter {\\n    private val adjustments: Adjustments = Adjustments()\\n\\n    //\\uBE44\\uC988\\uB2C8\\uC2A4\\uC5D0 \\uC885\\uC18D\\uC801\\uC778 \\uB85C\\uC9C1\\n    fun applyAdjustmentToEngine() {\\n        val brightness = adjustments.getEngineValue(AdjustmentType.BRIGHTNESS)\\n        val contrast = adjustments.getEngineValue(AdjustmentType.CONTRAST)\\n        val saturation = adjustments.getEngineValue(AdjustmentType.SATURATION)\\n\\n        //apply Adjustments to Engine\\n        println(\\\"apply adjustment brightness: $brightness\\\")\\n        println(\\\"apply adjustment contrast: $contrast\\\")\\n        println(\\\"apply adjustment saturation: $saturation\\\")\\n    }\\n}\\n\\n//After Refactoring (First Class Collection)\\nclass Adjustments {\\n    private val adjustmentList: List<Adjustment> = Adjustment.newAdjustment()\\n\\n    private fun getFactor(type: AdjustmentType): Float\\n            = adjustmentList.find { it.type == type }?.factor ?: 0f\\n\\n    fun getEngineValue(type: AdjustmentType): Float\\n            = getFactor(type) * 255f\\n}\\n\\n\")), mdx(\"h2\", {\n    \"id\": \"결론\"\n  }, \"\\uACB0\\uB860\"), mdx(\"p\", null, \"\\uC774 \\uAE00\\uC744 \\uC77D\\uC73C\\uC2DC\\uB294 \\uB3C5\\uC790\\uBD84\\uB4E4\\uB3C4 \\uB370\\uC774\\uD130 \\uBAA8\\uB378\\uC774 \\uCEEC\\uB809\\uC158\\uC778 \\uACBD\\uC6B0\\uC5D0 \\uD55C \\uBC88\\uCBE4 \\uACE0\\uB824\\uD574\\uBCF4\\uBA74 \\uC88B\\uC744 \\uAC83 \\uAC19\\uB2E4 \\u314E\\u314E (\\uBD84\\uBA85 \\uD074\\uB9B0\\uD55C \\uCF54\\uB4DC\\uC5D0 \\uB3C4\\uC6C0\\uC774 \\uB420 \\uAC83\\uC774\\uB2E4)\"), mdx(\"h2\", {\n    \"id\": \"참고\"\n  }, \"\\uCC38\\uACE0\"), mdx(\"ul\", null, mdx(\"li\", {\n    parentName: 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