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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 | 4× 4× 4× 10× 10× 4× 4× 5× 6× 5× 6× 7× 14× 7× 7× 7× 8× 8× 20× 18× 9× 6× 9× 9× 9× 9× 29× 28× 28× 23× 28× 14× 14× 7× 2× 2× 1× 1× 1× 1× 5× 2× 2× 2× 1× 1× 1× 1× 1× 1× 1× 3× 1× 1× 2× 3× 7× 7× 2× 7× 8× 8× 5× 11× 7× 8× 6× 1× 5× 2× 6× 4× 1× 1× 4× | import { MessageDispatcher } from '../message/message.dispatcher'; /** * Class represents DataObserver */ class DataObserver { /** * creates new DataObserver instance */ constructor() { /** * all observables are listed here * @type {{}} * @private */ this._observables = {}; /** * all registered DataSignatures without being subscribed * @type {{}} * @private */ this._signatures = {}; /** * Map with active subscriptions * @type {Map} * @private */ this._subscriptions = new Map(); } /** * registers a signature * @param {DataSignature} signature * @returns {DataObserver} */ addSignature(signature) { this._signatures[signature.key] = Object.assign({}, signature, { busy: false }); return this; } /** * remove signature * @param {DataSignature} signature * @returns {DataObserver} */ removeSignature(signature) { delete this._signatures[signature.key]; return this; } /** * get signature by key * @param {string} key * @returns {DataSignature|null} */ getSignature(key) { return (typeof this._signatures[key] === 'object') ? this._signatures[key] : null; } /** * sets busy state to true for a given signature * while instanciating. Avoids multi instanciating * same DataPool * @param {string} key * @returns {DataObserver} */ setSignatureBusy(key) { if(typeof this._signatures[key] === 'object') { this._signatures[key].busy = true; } return this; } /** * checks if signature isBusy * @param key * @returns {boolean} */ isSignatureBusy(key) { return (typeof this._signatures[key] === 'object') ? this._signatures[key].busy : false; } /** * adds an observable to internalObservable storage * @param {string} key * @param {DataAbstract} observableModule * @returns {DataObserver} */ addObservable(key, observableModule) { if( !key || typeof key !== 'string' || !observableModule || !~['function', 'object'].indexOf(typeof observableModule) ) { return this; } this._observables[key] = { observable: observableModule.getObservable(), push: (typeof observableModule.push === 'function') ? observableModule.push.bind(observableModule) : null, }; return this; } /** * deletes an stored observable by key * @param {string} key * @returns {DataObserver} */ removeObservable(key) { delete this._observables[key]; return this; } /** * checks if observable is registered and instanciated by key * @param {string} key * @returns {boolean} * @private */ _observableExists(key) { return ( !!key && typeof key === 'string' && !!this._observables[key] && typeof this._observables[key] === 'object' && !!this._observables[key].observable && typeof this._observables[key].observable === 'object' && typeof this._observables[key].observable.subscribe === 'function' ); } /** * checks if signature exists by key * @param {string} key * @returns {boolean} * @private */ _signatureExists(key) { return (typeof this._signatures[key] === 'object'); } /** * adds a subscription to the internal * subscription storage * @param {ModuleAbstract} origin - unique instance of where this subscription is registered from * @param {string} key * @param {Subscription} subscription - RxJs subscription instance * @returns {DataObserver} * @private */ _addSubscription(origin, key, subscription) { if(!this._subscriptions.has(origin)) { this._subscriptions.set(origin, new Set()); } let currentSubscriptions = this._subscriptions.get(origin); currentSubscriptions.add({ key, subscription, }); this._subscriptions.set(origin, currentSubscriptions); return this; } /** * get a set of subscriptions by its origin * @param {ModuleAbstract} origin * @returns {Set} */ getSubscriptions(origin) { return this._subscriptions.get(origin); } /** * get single subscription by its origin and data key * @param {ModuleAbstract} origin * @param {string} key * @returns {Subscription|null} */ getSubscription(origin, key) { const subscriptions = (origin) ? this.getSubscriptions(origin) : null; const foundSubscription = (subscriptions && subscriptions instanceof Set) ? Array.from(subscriptions).filter((subscription) => { return subscription.key === key; }) : []; return (foundSubscription.length) ? foundSubscription[0].subscription : null; } /** * checks if a certain subscription exists for its origin * @param {ModuleAbstract} origin * @param {string} key * @returns {boolean} */ subscriptionExists(origin, key) { const subscription = this.getSubscription(origin, key); return !!subscription; } /** * adds a subscription to a registered Data pool by its key * @param {ModuleAbstract} origin - unique instance of the subscribers scope * @param {DataSignature.key} to - DataSignature.key * @param {function|object} next - callback function on next item or objects with action props * @param {function} error - callback function on error * @param {function} complete - callback function on complete queue * @param {function} filter - filter messages by * @returns {DataObserver} */ subscribe(origin, to, next, error, complete, filter = null) { // eslint-disable-line complexity if(this._observableExists(to)) { let nextMethod = (typeof next === 'function') ? next : ( (typeof next === 'object') ? new MessageDispatcher(next).filter(filter) : null ); if(!nextMethod) { throw new Error('No next method declared calling .subscribe()'); } else Iif(nextMethod instanceof MessageDispatcher) { nextMethod = nextMethod.onMessage.bind(nextMethod); } const subscription = this._observables[to].observable.subscribe( nextMethod, error, complete, ); this._addSubscription(origin, to, subscription); } else if( this._signatureExists(to) && !this.isSignatureBusy(to) ) { this.setSignatureBusy(to); const signature = this.getSignature(to); if( signature && typeof signature.importModule === 'function' ) { signature .importModule(this) .then((observableModule) => { try { this.addObservable(to, observableModule); this.removeSignature(to); Eif(this._observableExists(to)) { this.subscribe(origin, to, next, error, complete, filter); } else { throw new Error('Observable could not be instanciated. (' + to + ')'); } } catch (err) { this.removeSignature(to); throw new Error(err); } }) .catch((err) => { return this; }); } else { return this; } } else if( this._signatureExists(to) && this.isSignatureBusy(to) ) { // Retry window.setTimeout(() => { return this.subscribe(origin, to, next, error, complete, filter); }, 100); } else { return this; } return this; } /** * unsubscribe form a certain DataPool by origin and key * @param {ModuleAbstract} origin * @param {string} key * @returns {DataObserver} */ unsubscribeFrom(origin, key) { const subscription = this.getSubscription(origin, key); if( subscription && typeof subscription.unsubscribe === 'function' ) { subscription.unsubscribe(); } return this; } /** * unsubscribe all subscription of a given origin * @param {ModuleAbstract} origin * @returns {DataObserver} */ unsubscribeAll(origin) { const subscriptions = this.getSubscriptions(origin); if( subscriptions && subscriptions instanceof Set && subscriptions.size ) { subscriptions.forEach((subscription) => { if( subscription && typeof subscription === 'object' && typeof subscription.subscription === 'object' && subscription.subscription && typeof subscription.subscription.unsubscribe === 'function' ) { subscription.subscription.unsubscribe(); } }); } return this; } /** * unsubscribe from subscription by origin and optionally key * @param {ModuleAbstract} origin * @param {DataSignature.key} from - DataSignature.key * @returns {DataObserver} */ unsubscribe(origin, from = null) { if(from && this.subscriptionExists(origin, from)) { this.unsubscribeFrom(origin, from); } else if(!from) { this.unsubscribeAll(origin); } return this; } /** * Push data to a Data instance * @param {DataSignature.key} key - DataSignature.key * @param {Message} message */ pushTo(key, message) { if(this._observableExists(key)) { Eif(typeof this._observables[key].push === 'function') { this._observables[key].push(message); } else { throw new Error('Observable (' + key + ') does not provide a .push() method.'); } } return this; } } export { DataObserver, }; |