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Redux Middleware Wars
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Me • So$ware Engineer at M3, Inc. • ҩྍݱͰ͏γεςϜͷ։ൃ • AngularJS, Rails, Node.js, Babel, etc. • GitHub, Qiita: @shuhei • TwiGer: @shuheikagawa • ! Ϗʔϧݕఆ 2 ڃ
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Middleware ʹ͍ͭͯͦ͢ͷલʹɾɾɾ
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ͦͦ Redux ͱʁ • Predictable state container for JavaScript apps • ༧ଌՄೳͳঢ়ଶίϯςφʢ༁ʣ • ͱͱ Time traveling, hot reloading Λతͱͯ͠࡞ΒΕͨ Flux తͳԿ͔
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Redux ͷ 3 ݪଇ 1. ΞϓϦͷશঢ়ଶΛҰͭͷ Object (State) ͱͯ͠อ࣋ 2. Action ΛૹΔʢdispatchʣ͜ͱʹ ΑͬͯͷΈ State ΛมߋͰ͖Δʢͱ͍ ͏͔৽͍͠ State ͕࡞ΒΕΔʣ 3. Reducer ͱ͍͏ pure ͳؔʢಉ͡Ҿ ʹରͯ͠ৗʹಉ͡ฦΓΛฦ͢ʣʹ ΑͬͯͷΈঢ়ଶ͕มߋ͞ΕΔ reducer : (State, Action) -> State
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! Pure ͳؔͱʁ • ҾͷΈʹΑͬͯฦΓ͕ܾ·Δ • ؔͷ֎ͷঢ়ଶΛมߋ͠ͳ͍ʢ෭࡞༻͕ͳ͍ʣ
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! Pure ͡Όͳ͍ؔ • ࣌ʹΑͬͯฦ͕͢ҧ͏ • ฦΓ͕ͳ͍ • ҾΛมߋͯ͠͠·͏ • ޙͰίʔϧόοΫ͕ݺΕΔ • etc.
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Β͵ؒʹΞϓϦ ͷঢ়ଶ͕มΘΔ͜ ͱ͕ͳ͍
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No content
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ͱ͍͑ɺ෭࡞༻Ͳ͏͢Δͷʁ • AJAX • local storage • cookie • ϩά • etc.
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• Reducer ͷதʹॻ͘: ແཧ • View Component ͷதʹॻ͘: ͔ͤͬ͘ঢ়ଶΛ͍ग़ͨ͠ͷ ʹɾɾɾ • Ac4on Creator ͷதʹॻ͘: dispatch Λ͢ඞཁ͋Γ
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Middleware
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Redux Middleware ͱ • dispatch ͷલޙʹॲཧΛڬΉ • Action Λड͚ͯɺΰχϣΰχϣͰ͖ Δ • Action ΛͪΐͬͱΒͤͯૹΔ • ผͷ Action ʹஔ͖͑Δ • ඇಉظॲཧΛߦ͍ɺ݁ՌΛ Action ͱͯ͠ૹΔ • e.g. WSGI, Rack, Express, Koa, etc.
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ྫ: ͳʹ͠ͳ͍ ड͚औͬͨ Ac$on Λͦͷ··࣍ͷ middleware ʹ͛Δ const passthrough = store => next => action => { return next(action); };
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ྫ: ϩάΛग़ྗ ࣍ͷ middleware ʹ ac+on Λ͛ΔʢnextʣલޙͰϩάΛग़ྗ const logger = store => next => action => { console.log('prev state', store.getState()); console.log('action', action); const returnValue = next(action); console.log('next state', store.getState()); return returnValue; };
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ྫ: Promise ͷ݁ՌΛͭ const promise = store => next => action => { if (typeof action.then === 'function') { return action.then(store.dispatch); } else { return next(action); } }; function fetchPosts() { return fetch('/posts').then(res => res.json()) .then(posts => ({ type: 'POSTS_FETCHED', posts })); } dispatch(fetchPosts);
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ࠓճඇಉظॲཧΛߦ͏ Middleware ʹয
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΄͍͠ͷ • ! ςετͷ͢͠͞ʢϞοΫແ͠ͰςετͰ͖Δͱ࠷ߴʣ • " ۭ࣌Λ͑Δʢthro'ling, debouncingʣ • # ϩδοΫͷڽू • ✨ ։ൃͷ׆ൃ͞
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ඇಉظॲཧΛߦ͏ Middleware ಠஅͱภݟʹΑΓ... | ----------------- | ---- | --------- | ---- | ---- | ---- | ---- | | name | star | from | test | time | cohe | acti | | ----------------- | ---- | --------- | ---- | ---- | ---- | ---- | | redux-thunk | 2392 | '15/07/13 | C | C | B | A | | redux-promise | 864 | '15/07/02 | - | C | C | C | | redux-saga | 3172 | '15/11/30 | B | A | A | A | | redux-loop | 641 | '16/01/06 | A | C | B | C | | redux-observable | 634 | '16/02/16 | C | A | B | A | | ----------------- | ---- | --------- | ---- | ---- | ---- | ---- | ⭐ ͷ 2016/7/5 ௐ
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redux-thunk ⭐2392 Ac#on ͱͯؔ͠ʢthunkʣ͕དྷͨΒɺͦΕΛ࣮ߦ͢ΔʢҾʹ dispatch ͱ getStateʣ const fetchBeers = () => (dispatch, getState) => { return fetch('/beers') .then(res => res.json()) .then(items => dispatch('FETCH_BEERS_SUCCEEDED', items)) .catch(error => dispatch('FETCH_BEERS_FAILED', error)); }; dispatch(fetchBeers());
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redux-thunk ⭐2392 • ! ϞοΫ͠ͳ͍ͱςετ͕ॻ͚ͳ͍ • " Ac%on ΛҰ͔ͭͮͭ͠ड͚ΒΕͳ͍ͷͰɺdebounce ͳͲ͕ ͍͠ • # ΄Ͳ΄ͲʹෳࡶͳϩδοΫॻ͚Δ • ✨ ΄Ͳ΄Ͳʹϝϯς͞Ε͍ͯΔɻͦͦ 13 ߦ͔͠ͳ͍ • ࢀߟ: How to dispatch a Redux ac%on with a %meout?
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redux-promise ⭐864 FSA (Flux Standard Ac/on) ͷ payload ͷ promise Λղܾ͠ɺ Ac/on ͱͯ͠ૹΓͯ͘͠ΕΔ function fetchItems() { const promise = fetch('/items').then(res => res.json()); return { type: 'FETCH_ITEMS', payload: promise }; } dispatch(fetchItems());
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redux-promise ⭐864 • ! γϯϓϧͳͷͰɺͦ͜·Ͱςετ͠ͳͯ͘ྑͦ͞͏ • " debounce ͳͲͰ͖ͳ͍ • # ෳࡶͳϩδοΫॻ͚ͳ͍ • ✨ 4 ϲ݄ఔϝϯς͞Εͯͳ͍ɻ25 ߦ͚͕ͩͩɾɾɾ • Τϥʔॲཧͷൺֱతॏཁͦ͏ͳ MR ͕Ϛʔδ͞Ε͕ͨϦϦʔ ε͞Ε͍ͯͳ͍
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redux-saga ⭐3172 Saga ͱݺΕΔ generator (saga) Ͱ෭࡞༻Λ͏ॲཧΛهड़ function* fetchBeer(action) { try { const beers = yield call(fetchBeer, action.id); yield put({ type: 'FETCH_BEER_SUCCEEDED', payload: beers }); } catch (error) { yield put({ type: 'FETCH_BEER_FAILED', error }); } } function* watchFetchBeer() { yield* takeEvery('FETCH_BEER', fetchBeer); }
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redux-saga ⭐3172 • ! ςετ͕͍͢͠ʂʂʂ • ෭࡞༻ϦΫΤετΛ yield ͯ͠ɺmiddleware ʹ࣮ߦͯ͠ Β͍ɺ݁ՌΛड͚औΔ • ࣗ pure ͳ··ෳࡶͳඇಉظॲཧ͕ॻ͚Δ • ৄ͘͠ @kuy ͞Μͷ͓Ͱɾɾɾ
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redux-loop (store enhancer) ⭐641 Elm Λਅࣅͨ APIɻreducer ͕ state ͚ͩͰͳ͘ Effects ฦ͢ function beers(state = [], action) { switch (action.type) { case 'FETCH_BEERS': return loop(state, Effects.promise(fetchBeers)); case 'FETCH_BEERS_SUCCEEDED': return action.payload; default: return state; } }
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redux-loop (store enhancer) ⭐641 • ! ϞοΫͳ͠ͰςετͰ͖Δ • Effects ͨͩͷ Objectɻ࣮ߦ͢Δ·Ͱ෭࡞༻ى͖ͳ͍ • " debounce ͳͲͰ͖ͳͦ͞͏ • # Effects ΛΈ߹ΘͤΔ͜ͱ͕Ͱ͖Δ • ✨ 3 ϲ݄΄Ͳϝϯς͞Ε͍ͯͳ͍ɻ࡞ऀ͕ Elm ͔͠ॻ͔ͳ͘ ͳͬͯ͠·ͬͨʁ
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redux-observable ⭐ 634 reducer ͷޙͰ Action Λड͚ͯ Action Λग़ྗ͢Δ Observable Λฦ͢ function beerEpic(action$, store) { const beers$ = action$.ofType('FETCH_ITEMS') .mergeMap(() => Observable.fromPromise(fetchBeers())) .map(beers => ({ type: 'FETCH_BEERS_SUCCEEDED', payload: beers })); return Observable.merge( beers$, something$ ); }
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redux-observable ⭐ 634 • ! ϞοΫ͠ͳ͍ͱςετͰ͖ͳ͍ • " Rx ͷڧྗͳ operator Ͱ༰қʹۭ࣌Λ੍ͤΔ • # redux-saga తͳ background processor style ʹਐԽ • ෳࡶͳॲཧॻ͚Δ • ✨ ݱࡏ։ൃதɻͱͯγϯϓϧ • Rx ΩϚΔͱؾ͍͍࣋ͪʢݸਓͷײʣ
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τϨϯυʢʁʣ • σʔλͱͯ͠ͷ෭࡞༻ʢsaga, loop, Cycle.jsʣ • ෭࡞༻ϦΫΤετΛ middleware ͕ॲཧ͢Δ • ։ൃऀ͕ॻ͘ϩδοΫ͕៉ྷʹอͯΔ • Background processor ελΠϧʢsaga, observable, chooʣ • reducer ͷલͰͳ͘ޙͰ Action Λड͚Δ
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࠙ձͰ͍Ζ͍Ζڭ͑ͯԼ͍͞ʂ
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Thanks!
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Credits • Chart of Redux from h0p:/ /www.bebe0erdeveloper.com/coding/ ge=ng-started-react-redux.html