Distributed Algorithms in NoSQL Databases
Scalability is one of the main drivers of the NoSQL movement. As such, it encompasses distributed system coordination, failover, resource management and many other capabilities. It sounds like a big umbrella, and it is. Although it can hardly be said that NoSQL movement brought fundamentally new techniques into distributed data processing, it triggered an avalanche of practical studies and real-li
Curiously recurring template pattern - Wikipedia
The curiously recurring template pattern (CRTP) is an idiom, originally in C++, in which a class X derives from a class template instantiation using X itself as a template argument.[1] More generally it is known as F-bound polymorphism, and it is a form of F-bounded quantification. The technique was formalized in 1989 as "F-bounded quantification."[2] The name "CRTP" was independently coined by Ji
Patterns in Functional Programming
Exploiting the relationship between data structure and program structure My friend Alan Jeffrey passed away earlier this year. I described his professional life at a Celebration in Oxford on 2nd November 2024. This post is a slightly revised version of what I said. Edinburgh, 1983–1987 I’ve known Alan for over 40 years—my longest-standing friend. We met at the University of Edinburgh in 1983, offi
Scalable System Design Patterns
Looking back after 2.5 years since my previous post on scalable system design techniques, I've observed an emergence of a set of commonly used design patterns. Here is my attempt to capture and share them. Load Balancer In this model, there is a dispatcher that determines which worker instance will handle the request based on different policies. The application should best be "stateless" so any wo
Scalability, Availability & Stability Patterns
This document provides an overview of patterns for scalability, availability, and stability in distributed systems. It discusses general recommendations like immutability and referential transparency. It covers scalability trade-offs around performance vs scalability, latency vs throughput, and availability vs consistency. It then describes various patterns for scalability including managing state
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GoFパターンã§ã¯ã€æŠ½è±¡çš„ã‹ã¤æ±Žç”¨çš„ãªãƒ‘ターンãŒå¤šã扱ã‚ã‚Œã¦ã„ã¾ã™ãŒã€‚ ã“ã“ã§ã¯ã€æŠ½è±¡ã«ä¾ã‚‰ãªã„パターンやã€ã‚ã¾ã‚Šæ±Žç”¨çš„ã¨ã¯è¨€ãˆãªã„パターンも扱ã„ã¾ã™ã€‚ ↑ Uncopyable(Noncopyable)パターン †役立ã¡åº¦ï¼šâ˜…★☆ C++ã«ãŠã‘ã‚‹ã€ã‚¯ãƒ©ã‚¹ã®ã‚³ãƒ”ー抑æ¢ã®ãŸã‚ã®ãƒ‘ターン。 ã“ã®ãƒ‘ターンを用ã„ã‚‹ã¨ã€ã‚³ãƒ¼ãƒ‰ä¸ã«ã‚³ãƒ”ーを行ã†è¨˜è¿°ãŒã‚ã‚‹éš›ã«ã€ コンパイラãŒã‚³ãƒ”ーコンストラクタを生æˆã—よã†ã¨ã—ã¦ã€ã‚³ãƒ³ãƒ‘イルエラーã¨ãªã‚Šã¾ã™ã€‚ private 継承をã™ã‚‹ã“ã¨ã§ã€ã‚³ãƒ”ー抑æ¢ã®ãƒã‚¸ãƒƒã‚¯ã«ã¤ã„ã¦ã‚µãƒ–クラスå´ã«æ„è˜ã•ã›ãšã«æ¸ˆã‚“ã§ã„ã¾ã™ã€‚ /// コピー抑æ¢æ©Ÿèƒ½ã‚’æŒã¤ã‚¯ãƒ©ã‚¹ class Uncopyable { private: /// コピーコンストラクタ Uncopyable(const Uncopyable&); /// 代入演算å Uncopyable& operator=(con
artima - Scala's Stackable Trait Pattern
This article describes a Scala design pattern in which traits provide stackable modifications to underlying core classes or traits. One way to use Scala's traits is as stackable modifications. In this pattern, a trait (or class) can play one of three roles: the base, a core, or a stackable. The base trait (or abstract class) defines an abstract interface that all the cores and stackables extend, a
Pimp My Lock: A case study in Scala API design
Josh Cough had an amusing article on pimping vs fixing libraries. He ran into an intolerable method in the Java standard libraries and decided to fix it with the Pimp My Library pattern. Today I want to pimp a different Java library: Lock. Scala has higher-level ways of dealing with concurrency than Locks, but every now and then you need to get down with the nitty-gritty and do some manual locking
満足ã›ã‚‹è±šã€‚çœ ãŸã’ãªãƒãƒã€‚:The Universal Design Pattern ãŒãŠã‚‚ã—ã‚ãã†ãªä»¶
ã¾ã èªã‚“ã§ãªã„ã‘ã©ã€ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ç•Œã®æˆ¦ç•¥ã‚µãƒ•ã‚¡ãƒªã‹ã¨æ€ã„ãã‚„ã€æ–°ã—ã„視点ã®æ案ãªã®ã‹ãªï¼Ÿ Stevey's Blog Rants: The Universal Design Pattern With this context in mind, I claim that the Properties Pattern is yet another kind of domain modeling, with its own unique strengths and tradeoffs, distinct from all the other modeling schools I've mentioned. At a high level, every implementation of the Properties Pattern has the same core API. It's the
Common Subsequence 解説
å•é¡Œå：Common Subsequence (PKU) 出典：Southeastern Europe 2003 難易度：☆☆☆ å•é¡Œã®ç¨®é¡žï¼šDP 解法：LCS (Longest Common Subsequence) 解ç”ソースコード： 1458-deq.cpp アルゴリズムã®æ¦‚ç•¥ DPã®å››å¤©çŽ‹ï¼ˆï¼Ÿï¼‰ï¼ŒLCS (Longest Common Subsequence) ãã®ã¾ã¾ã®å•é¡Œã§ã™ã€‚ アジア地区予é¸ãªã©ï¼Œé€šå¸¸ã¯ã“れをã²ãã£ãŸå•é¡ŒãŒå‡ºã¦ãã¾ã™ã€‚ LCSã¨ã¯ï¼ŒäºŒã¤ã®å€¤ã®åˆ—（ã“ã®å•é¡Œã§ã¯æ–‡å—列）ãŒä¸Žãˆã‚‰ã‚Œã¦ï¼Œæœ€é•·ã®å…±é€šéƒ¨åˆ†åˆ—を見ã¤ã‘ã‚‹å•é¡Œã§ã™ã€‚ 部分列ã¯é€£ç¶šã—ã¦ã„ã‚‹å¿…è¦ã¯ã‚ã‚Šã¾ã›ã‚“ãŒï¼Œé †åºã¯å¤‰æ›´ã—ã¦ã¯ã„ã‘ã¾ã›ã‚“。 例ãˆã° X = "abcfbc", Y = "abfcab" ã§ã‚ã‚Œã°LCS㯠"abfc" ã‚„ "abcb" ã«ãªã‚Šã¾ã™ã€‚ LCSã¯ä¸€èˆ¬çš„ã«è¤‡æ•°ã‚ã‚Šãˆã¾ã™ãŒï¼Œã“ã®å•é¡Œã§ã¯ãã®é•·
Bill de hÓra: Patterns of Web Architecture
Eric Newcomer: "This afternoon I finally caught up up on Steve Vinoski's recent article and blog entries about the "evils" of RPC. If you aren't already among those who have read them thoroughly, I'd encourage you to. Including the comments, it's one of the best discussions of the merits and demerits of RPC and REST that I've ever seen. The core of his argument is that the RPC abstraction is n
Computer Science - Vrije Universiteit Amsterdam
Exchange programme VU Graduate Winter School Honours programme VU-NT2 Semester in Amsterdam
Emacs Lisp ã®ãƒ‘ターン - ã‚ã©ã‘ãªã„話
デザイン(è¨è¨ˆ)パターンã¨ã„ã†ç¨‹ã®ã“ã¨ã¯ãªã„ã€Emacs Lisp ã®ãƒ‘ターンをæ€ã„ã¤ãã¾ã¾ã«æ›¸ãã¾ã™ã€‚心ã¯ã€ 高階関数を書ã“ㆠマクãƒã‚’書ã“ㆠã§ã™ã€‚ mapcar mapcar ã¯ã€å¼•æ•°ã«é–¢æ•°ã‚’ã¨ã‚‹é«˜éšŽé–¢æ•°ã®ã‚ˆã„例ã§ã™ã€‚リストをå–ã‚Šã€ãã‚Œãžã‚Œã®å€¤ã‚’åŠ å·¥ã—ã¦ã€æ–°ã—ã„リストを返ã™ãƒ‘ターンã®ã¨ãã¯ã€mapcar を使ã„ã¾ã—ょã†ã€‚ (mapcar '1+ '(1 2 3 4)) ;; => (2 3 4 5) mapcar ã«ã¯ã€è‡ªåˆ†ã®ã•ã›ãŸã„仕事を実装ã—ãŸé–¢æ•°ã‚’渡ã—ã¾ã—ょã†ã€‚ (defun f(x) (1+ (* x 2))) (mapcar 'f '(1 2 3 4)) ;; => (3 5 7 9) mapcar を連çµã—ã¾ã—ょã†ã€‚(オブジェクト指å‘ã§ã®ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã®é€£çµã«ä¼¼ã¦ã„ã¾ã™ã。) (mapcar '1+ (mapcar (lambda(x) (* x 2)) '(1 2 3 4)
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Graph Twiddling in a MapReduce World
Asynchronous Iteration Patterns (in Node.js) | Hacker News
Extension Object Design Pattern 07 January 2008 Sreenivas Munnangi Sun Proprietary/Confidential: Internal Use Only 2 Agenda • What is Extension Object Design Pattern • How is it useful ? • Implementation Details • Q & A Sun Proprietary/Confidenti
comp647-lec9-EclipseEnvironment
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