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Promise ã§æŽ’他制御を行ㆠ- Qiita
Promise ã§ã®éžåŒæœŸå‡¦ç†æ™‚ã€æŽ’ä»–åˆ¶å¾¡ã‚’æ€ ã£ãŸã°ã£ã‹ã‚Šã«ãƒã‚°ã‚’出ã—ã¦ã—ã¾ã£ãŸã€ãã‚“ãªçµŒé¨“ã‚ã‚Šã¾ã›ã‚“ã‹ã€‚ç§ã¯ã‚ã‚Šã¾ã™ã€‚ スレッドを使ã†å ´åˆã€Mutex ã‚„ synchronized ç‰ã€…ã€å¤§æŠµæŽ’他制御を行ã†ãƒ©ã‚¤ãƒ–ラリや構文ãªã©ãŒã‚»ãƒƒãƒˆã§ã¤ã„ã¦ãã‚‹ã®ã ã‘ã©ã€Promise/A+ ã«ã¯ç„¡ã„ã®ã§è‡ªå‰ã§åˆ¶å¾¡ã™ã‚‹å¿…è¦ãŒã‚る。 ãªã®ã§ã€Promise ã§æŽ’他制御ãŒå‡ºæ¥ã‚‹ãƒ©ã‚¤ãƒ–ラリを npm ã‹ã‚‰èª¿ã¹ã€ã‚ã¼ã—ã„物二ã¤ã‚’ピックアップã—ã¦ã¿ãŸã€‚ async-lock https://www.npmjs.com/package/async-lock 一番メジャーã£ã½ã„ライブラリ。ダウンãƒãƒ¼ãƒ‰æ•°ã‚‚多ã„。 ãƒãƒƒã‚¯å–得時ã€key を指定ã™ã‚‹ redis ã® key ã® set ã®ã‚ˆã†ã«ã€key ã”ã¨ã«æŽ’他制御ã—ãŸã„å ´åˆã«ä¾¿åˆ© タイムアウトã®ã‚µãƒãƒ¼ãƒˆ å¾…ã¡å—ã‘タスク数ã®ä¸Šé™ã®ã‚µãƒãƒ¼ãƒˆ インターフェイスãŒã€acqui
Promiseテンプレート - Qiita
Promiseã¨ã¯ Promiseã¯éžåŒæœŸå‡¦ç†ã‚’抽象化ã—ãŸã‚ªãƒ–ジェクトã¨ãれをæ“作ã™ã‚‹ä»•çµ„ã¿ã®äº‹ã‚’ã„ã„ã¾ã™ã€‚ å‚考：JavaScript Promiseã®æœ¬ ã“ã®ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã¯ï¼Ÿ Promiseã«ã¤ã„ã¦ã„ã‚ã„ã‚勉強ã—ãŸçµæžœã€ 自分ã®ãªã‹ã§ã“ã†ã„ã†æ›¸ãæ–¹ãŒã‚ã‹ã‚Šã‚„ã™ã„ã‹ãªãã¨ã¾ã¨ã‚ãŸå†…容ã§ã™ã€‚ 今後も使ã„ãã†ãªã®ã§ãƒ†ãƒ³ãƒ—レートã«ã—ã¦ãŠãã¾ã—ãŸã€‚ ソース Promise処ç†ã‚’é †ç•ªã«å‡¦ç†ã—ãŸã„å ´åˆ call_async_process.process_A(params) .then(function(value) { // æˆåŠŸæ™‚：何ã‹å‡¦ç† //　次ã®é–¢æ•°ã®å¼•æ•° return proaRes }) .then(call_async_process.process_B) .then(function(value) { // æˆåŠŸæ™‚：何ã‹å‡¦ç† //　次ã®é–¢æ•°ã®å¼•æ•° return probRes })
Promiseã¯ã©ã†å‹•ä½œã™ã‚‹ã®ã‹ – Promiseを実装ã—ã¦ã¿ã‚‹ | POSTD
目次 1. ã¯ã˜ã‚ã« 2. Promiseã®æ¦‚念をç†è§£ã™ã‚‹ 幕間：行列ãŒå«Œã„ãªå¥³ã®å 2.1 Promiseã¨ã¯ä½•ã‹ï¼Ÿ å¹•é–“ï¼šå®Ÿè¡Œé †åº 2.2 Promiseã¨ä¸¦è¡Œå‡¦ç† 幕間：å¼ã®æŠ½è±¡åŒ– 3. Promiseã®ã‹ã‚‰ãã‚Šã‚’ç†è§£ã™ã‚‹ 3.1. Promiseã§å¼ã‚’é †åºä»˜ã‘ã™ã‚‹ 3.2. 最å°é™ã®Promise実行 4.Promiseã¨ã‚¨ãƒ©ãƒ¼å‡¦ç† 幕間：計算失敗ã®å ´åˆ 4.1. エラーをPromiseã§å‡¦ç†ã™ã‚‹ 4.2. Promiseã®å¤±æ•—ã®ä¼æ’ 5. Promiseã®çµåˆ 5.1. Promiseを確定的ã«çµåˆã™ã‚‹ 5.2. Promiseã‚’éžç¢ºå®šçš„ã«çµåˆã™ã‚‹ 6. Promiseã®å®Ÿç”¨çš„ãªç†è§£ 6.1. ECMAScript Promiseã®å°Žå…¥ 6.2. .then ã®åˆ†æž 7. Promiseã¨ã¯ç›¸æ€§ãŒæ‚ªã„ケースã¨ã¯ï¼Ÿ 8. ã¾ã¨ã‚ å‚考文献 è¿½åŠ è³‡æ–™ 資料ã¨ãƒ©ã‚¤ãƒ–ラリ 1. ã¯ã˜ã‚ã«
Taming the asynchronous beast with ES7
One of the trickiest aspects of PouchDB is that its API is asynchronous. I see no shortage of confused questions on Stack Overflow, Github, and IRC, and most often they stem from a misunderstanding of callbacks and promises. We can't really help it. PouchDB is an abstraction over IndexedDB, WebSQL, LevelDB (in Node), and CouchDB (via Ajax). All of those APIs are asynchronous; hence PouchDB must be
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