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January 12, 2020 05:46
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| let _activeIndexingId = ""; | |
| let _activeQueryId = ""; | |
| const indexingMachine = Machine({ | |
| id: 'indexer', | |
| initial: "QUERYING", | |
| states: { | |
| IDLE: { | |
| on: { | |
| INVALIDATE: 'STALE', | |
| UPDATE_FILTERS: 'QUERYING' | |
| } | |
| }, | |
| STALE: { | |
| on: { | |
| START: 'INDEXING' | |
| }, | |
| after: { | |
| 750: 'INDEXING' | |
| }, | |
| }, | |
| INDEXING: { | |
| on: { | |
| INVALIDATE: 'STALE', | |
| }, | |
| invoke: { | |
| id: "reindex", | |
| src: () => reIndex(_activeIndexingId = Date.now()), | |
| onDone: { | |
| target: 'QUERYING' | |
| }, | |
| onError: { | |
| target: 'FAILED' | |
| } | |
| } | |
| }, | |
| QUERYING: { | |
| on: { | |
| INVALIDATE: "STALE", | |
| UPDATE_FILTERS: "QUERYING", | |
| }, | |
| invoke: { | |
| id: "query", | |
| src: () => query(_activeQueryId = Date.now()), | |
| onDone: { | |
| target: "IDLE" | |
| }, | |
| onError: { | |
| target: "FAILED" | |
| } | |
| } | |
| }, | |
| FAILED: { | |
| on: { | |
| INVALIDATE: 'STALE', | |
| RETRY: 'INDEXING' | |
| } | |
| } | |
| } | |
| }); | |
| const query = (queryId) => { | |
| console.log("STARTING QUERY", queryId, _activeQueryId); | |
| return new Promise((resolve) => { | |
| setTimeout(() => { | |
| if (queryId !== _activeQueryId) { | |
| console.log("CANCELED QUERY") | |
| } else { | |
| console.log("SAVING QUERY RESULT", queryId, _activeQueryId, Date.now()) | |
| } | |
| resolve(); | |
| }, 4000) | |
| }) | |
| } | |
| const reIndex = (indexingId) => { | |
| console.log("STARTING INDEX", indexingId, _activeIndexingId); | |
| return new Promise((resolve) => { | |
| setTimeout(() => { | |
| console.log("COMPLETED INDEX", indexingId, _activeIndexingId); | |
| if (indexingId !== _activeIndexingId) { | |
| console.log("CANCELING TRANSACTION"); | |
| } else { | |
| console.log("SAVING TRANSACTION"); | |
| } | |
| resolve(); | |
| }, 700); | |
| }) | |
| }; |
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