1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | 1x 1x 1x 144x 72x 72x 72x 72x 72x 72x 288x 72x 72x 72x 72x 72x 72x 65x 65x 65x 65x 61x 65x 65x 65x 65x 65x 65x 65x 65x 65x 65x 65x 65x 77x 77x 12x 12x 12x 12x 12x 12x 12x 12x 12x 77x 77x 77x 77x 77x 257x 77x 45x 77x 18x 12x 6x 4x 18x 59x 12x 47x 47x 47x 47x 67x 67x 67x 67x 1x 1x 1x 1x 1x 154x 77x 257x 45x 32x | import EventEmitter from 'component-emitter'; import makeDebug from 'debug'; const debug = makeDebug('base-engine'); export default class BaseEngine { constructor (service, options = {}) { debug('constructor entered'); this._service = service; this._publication = options.publication; this._subscriber = options.subscriber || (() => {}); this._sorter = options.sort; this._eventEmitter = new EventEmitter(); this._listener = eventName => remoteRecord => this._mutateStore( eventName, remoteRecord, 0 ); this._eventListeners = { created: this._listener('created'), updated: this._listener('updated'), patched: this._listener('patched'), removed: this._listener('removed') }; this.useUuid = options.uuid; this.emit = this._eventEmitter.emit; this.on = this._eventEmitter.on; this.listening = false; this.store = { last: { eventName: '', action: '', record: {} }, records: [] }; } snapshot (records) { debug('snapshot entered'); this.store.last = { action: 'snapshot' }; this.store.records = records; if (this._sorter) { records.sort(this._sorter); } this.emit('events', this.store.records, this.store.last); this._subscriber(this.store.records, this.store.last); } addListeners () { debug('addListeners entered'); const service = this._service; const eventListeners = this._eventListeners; service.on('created', eventListeners.created); service.on('updated', eventListeners.updated); service.on('patched', eventListeners.patched); service.on('removed', eventListeners.removed); this.listening = true; this.emit('events', this.store.records, { action: 'add-listeners' }); this._subscriber(this.store.records, { action: 'add-listeners' }); } removeListeners () { debug('removeListeners entered'); if (this.listening) { const service = this._service; const eventListeners = this._eventListeners; service.removeListener('created', eventListeners.created); service.removeListener('updated', eventListeners.updated); service.removeListener('patched', eventListeners.patched); service.removeListener('removed', eventListeners.removed); this.listening = false; this.emit('events', this.store.records, { action: 'remove-listeners' }); this._subscriber(this.store.records, { action: 'remove-listeners' }); } } _mutateStore (eventName, remoteRecord, source) { debug(`_mutateStore started: ${eventName}`); const that = this; const idName = this._useUuid ? 'uuid' : ('id' in remoteRecord ? 'id' : '_id'); const store = this.store; const records = store.records; const index = this._findIndex(records, record => record[idName] === remoteRecord[idName]); if (index >= 0) { records.splice(index, 1); } if (eventName === 'removed') { if (index >= 0) { broadcast('remove'); } else if (source === 0 && (!this._publication || this._publication(remoteRecord))) { // Emit service event if it corresponds to a previous optimistic remove broadcast('remove'); } return; // index >= 0 ? broadcast('remove') : undefined; } if (this._publication && !this._publication(remoteRecord)) { return index >= 0 ? broadcast('left-pub') : undefined; } records[records.length] = remoteRecord; Eif (this._sorter) { records.sort(this._sorter); } return broadcast('mutated'); function broadcast (action) { debug(`emitted ${index} ${eventName} ${action}`); store.last = { source, action, eventName, record: remoteRecord }; that.emit('events', records, store.last); that._subscriber(records, store.last); } } changeSort (sort) { this._sorter = sort; Eif (this._sorter) { this.store.records.sort(this._sorter); } this.emit('events', this.store.records, { action: 'change-sort' }); this._subscriber(this.store.records, { action: 'change-sort' }); } _findIndex (array, predicate = () => true, fromIndex = 0) { for (let i = fromIndex, len = array.length; i < len; i++) { if (predicate(array[i])) { return i; } } return -1; } } |