{"id":15008647,"url":"https://github.com/uehaj/dart-saga","last_synced_at":"2025-04-09T16:05:55.961Z","repository":{"id":56827764,"uuid":"129187273","full_name":"uehaj/dart-saga","owner":"uehaj","description":"[WIP] port of redux-saga to Dart","archived":false,"fork":false,"pushed_at":"2018-06-05T21:39:23.000Z","size":55,"stargazers_count":12,"open_issues_count":0,"forks_count":1,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-04-09T16:05:33.087Z","etag":null,"topics":["dart","isolate","redux-saga"],"latest_commit_sha":null,"homepage":null,"language":"Dart","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"bsd-3-clause","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/uehaj.png","metadata":{"files":{"readme":"README.ja.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2018-04-12T03:26:09.000Z","updated_at":"2023-04-25T14:50:26.000Z","dependencies_parsed_at":"2022-08-29T02:31:47.451Z","dependency_job_id":null,"html_url":"https://github.com/uehaj/dart-saga","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/uehaj%2Fdart-saga","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/uehaj%2Fdart-saga/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/uehaj%2Fdart-saga/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/uehaj%2Fdart-saga/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/uehaj","download_url":"https://codeload.github.com/uehaj/dart-saga/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":248065289,"owners_count":21041871,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["dart","isolate","redux-saga"],"created_at":"2024-09-24T19:19:52.252Z","updated_at":"2025-04-09T16:05:55.848Z","avatar_url":"https://github.com/uehaj.png","language":"Dart","funding_links":[],"categories":[],"sub_categories":[],"readme":"# [WIP] Port of redux-saga to Dart\n\n[英語](README.md)\n\nDart-Saga は Redux-saga の Dart への移植版です。\n\nこのライブラリは、チャンネルを通じた Dart のアイソレート間の協調をサポートします。\n\n単独で動作しますが、今後 dart-redux に組込まれる予定です\n\ndart-saga(及び redux-saga)の目的は、アプリケーションの副作用、たとえば非同期処理や非純粋操作などを容易かつ効率的に実行し、テストを完結にしたり、失敗をより良く扱うことです。\n\nredux-saga は ES6 ジェネレータを用いたコルーチンを並行処理の基盤としていますが、dart-saga では Dart のアイソレートとストリームを使用します。これは Dart の流儀に馴染み、自然であり実装を容易にしてもいます。とはいえ、dart-saga の API 上は、アイソレートやストリームを意識する必要はありません。\n\ndart-saga は、低レベルな Dart のアイソレートやストリームの操作を抽象化・隠蔽する、上位のライブラリ層だと言うこともできるでしょう。\n\n_注意_: このパッケージは開発中であり、多くの機能がまだ利用できません。[フィードバック](https://github.com/uehaj/dart-saga/issues)や[プルリクエスト](https://github.com/uehaj/dart-saga/pulls)を歓迎します。\n\n## サンプルコード\n\n```dart\nimport \"dart:async\";\nimport 'package:dart_saga/dart_saga.dart';\n\nrootSaga([msg, greeting]) async* {\n  print(\"rootSaga(${msg}) started greeting: ${greeting}\");\n  Completer\u003cint\u003e saga2handle = new Completer();\n  yield fork(saga2, [\"start saga2\"], saga2handle);\n\n  for (int i = 0; i \u003c 10; i++) {\n    yield delay(1000);\n    if (i == 5) {\n      yield cancel(await saga2handle.future);\n    }\n  }\n}\n\nsaga2([msg]) async* {\n  print(\"           saga2(${msg}) started\");\n  Completer\u003cint\u003e saga3handle;\n  yield fork(saga3, [\"start saga3\"], saga3handle);\n\n  for (int i = 0; true; i++) {\n    print(\"           saga2\");\n    yield delay(1000);\n    yield put(Action(\"HOGE\", \"From saga2\"));\n    if (i == 3) {\n      yield cancel(await saga3handle.future);\n    }\n  }\n}\n\nsaga3([msg]) async* {\n  print(\"                      saga3(${msg}) started\");\n  while (true) {\n    print(\"                      saga3\");\n    Completer takenAction = new Completer();\n    yield take(\"HOGE\", takenAction);\n    print(\"                      taken ${await takenAction.future}\");\n  }\n}\n\nmain() {\n  var effectManager = new EffectManager();\n  effectManager.run(rootSaga, [\"start rootSaga\", \"hello\"]);\n}\n```\n\n### Demo\n\n```\n% pub run example/simple_demo.dart\nstart _isolate context\nTask.start 0\nrootSaga(start rootSaga) started greeting: hello\nTask.start 1\n           saga2(start saga2) started\n           saga2\nTask.start 2\n                      saga3(start saga3) started\n                      saga3\n           saga2\n                      taken Action(HOGE, From saga2)\n                      saga3\n           saga2\n                      taken Action(HOGE, From saga2)\n                      saga3\n           saga2\n                      taken Action(HOGE, From saga2)\n                      saga3\nTask(taskId=2) terminated: null.\nTask(taskId=1) terminated: null.\nTask(taskId=0) terminated: null.\n```\n\n# Redux-Saga のエフェクト実装状況\n\n- [x] take\n- [ ] takeMaybe\n- [x] put\n- [ ] putResolve\n- [ ] all\n- [ ] race\n- [x] call\n- [ ] apply\n- [ ] cps\n- [x] fork\n- [ ] spawn\n- [ ] join\n- [x] cancel\n- [ ] select\n- [ ] actionChannel\n- [ ] cancelled\n- [ ] flush\n- [ ] getContext\n- [ ] setContext,\n- [ ] retry\n- [x] takeEvery\n- [x] takeLatest\n- [ ] takeLeading\n- [ ] throttle\n- [x] delay\n\n# 仕様上の制約\n\n## yield が値を返さない\n\nDart のジェネレータおよび非同期ジェネレータでは、Dart の言語仕様上 yield が[値を返すことはできません](https://github.com/dart-lang/sdk/issues/32831)(Python や ES2015 では可能)。このライブラリではエフェクトの yield で値を取得するために Completer を使用します。\n\nたとえば、\n\n```\n  int sagaHandle = yield fork(saga2, []);\n```\n\nのように書きたいときでも、本ライブラリでは以下のように記述する必要があります。\n\n```\n  Completer\u003cint\u003e sagaHandle = new Completer();\n  yield fork(saga2, [], sagaHandle);\n```\n\n## Isolate 間の保護\n\nIsolate 間ではメモリは共有できません。1 つの Isolate で Completeter から他の Isolate で待ち受ける Future\nを発火させることはできません。\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fuehaj%2Fdart-saga","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fuehaj%2Fdart-saga","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fuehaj%2Fdart-saga/lists"}