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ts/smartcache.classes.cachemanager.ts

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+import * as plugins from './smartcache.plugins';
+import { SmartError } from '@pushrocks/smarterror';
+
+export interface ICacheMap {
+  [key: string]: {
+    timer: plugins.smarttime.Timer;
+    cachedDeferred: plugins.smartpromise.Deferred<any>;
+    cachedObject: any;
+  };
+}
+
+export class CacheManager {
+  private _cacheMap: ICacheMap = {};
+
+  cacheExists(identifierArg): boolean {
+    if (this._cacheMap[identifierArg]) {
+      return true;
+    }
+    return false;
+  }
+
+  stillValid(identifierArg: string): boolean {
+    if (this.cacheExists(identifierArg) && this._cacheMap[identifierArg].timer.startedAt.isYoungerThanMilliSeconds(
+      this._cacheMap[identifierArg].timer.timeInMilliseconds
+    )) {
+      return true;
+    }
+    return false;
+  }
+
+  // announce the caching of something
+  announceCache(identifierArg: string, validForArg: number) {
+    this._cacheMap[identifierArg] = {
+      timer: new plugins.smarttime.Timer(validForArg),
+      cachedDeferred: new plugins.smartpromise.Deferred(),
+      cachedObject: null
+    };
+    this._cacheMap[identifierArg].timer.start();
+    this._cacheMap[identifierArg].timer.completed.then(() => {
+      this.deleteCache(identifierArg)
+    });
+  }
+
+  /**
+   * waits for the cache to be ready
+   */
+  async waitForCacheReady (identifierArg: string) {
+    await this._cacheMap[identifierArg].cachedDeferred.promise
+    return true;
+  }
+
+  setCache(identifierArg: string, cachedObjectArg: any, validForArg = 1000) {
+    if(!this.cacheExists(identifierArg)) {
+      console.log(new SmartError(`Cache for ${identifierArg} has not been announced or timed out!`));
+    }
+    this._cacheMap[identifierArg].cachedObject = cachedObjectArg;
+    this._cacheMap[identifierArg].cachedDeferred.resolve();
+  }
+
+  getCache(identifierArg: string) {
+    return this._cacheMap[identifierArg];
+  }
+
+  async deleteCache(identifierArg: string) {
+    delete this._cacheMap[identifierArg];
+  }
+}