move db to eventSyncer

src/eventSyncer.js

@@ -1,13 +1,47 @@
 const { Observable, fromEvent, interval, Subject, ReplaySubject } = require('rxjs');
 const { throttle, throttleTime, map, distinctUntilChanged, filter, average, reduce, count, scan } = require('rxjs/operators');
+const loki = require('lokijs')
+//const db = new loki('loki.json', {autosave: true, autoload: true})
 
 class EventSyncer {
 
-  constructor(db, events) {
-    this.db = db;
+  constructor(events) {
     this.events = events;
   }
 
+  init(cb) {
+    this.db = new loki('phoenix.db', {
+      autoload: true,
+      autoloadCallback: () => {
+        this.databaseInitialize(cb)
+      },
+      autosave: true,
+      autosaveInterval: 2000 // save every four seconds for our example
+    })
+  }
+
+  databaseInitialize(cb) {
+    let children = this.db.getCollection('children')
+    if (!children) {
+      children = this.db.addCollection('children')
+      this.db.saveDatabase()
+    }
+    let tracked = this.db.getCollection('tracked')
+    if (!tracked) {
+      tracked = this.db.addCollection('tracked')
+      this.db.saveDatabase()
+    }
+
+    let dbChanges = fromEvent(this.events, "updateDB")
+
+    dbChanges.pipe(throttle(val => interval(400))).subscribe(() => {
+      console.dir("saving database...")
+      this.db.saveDatabase()
+    })
+
+    cb();
+  }
+
   trackEvent(eventName, filterConditions) {
     let eventKey = eventName + "-from0x123";
 
@@ -51,4 +85,8 @@ class EventSyncer {
 
 }
 
+// process.on('exit', function () {
+//   db.close()
+// });
+
 module.exports = EventSyncer;

src/index.js

@@ -6,51 +6,12 @@ const { throttle, throttleTime, map, distinctUntilChanged, filter, average, redu
 const Simulator = require('./simulator.js')
 const EventSyncer = require('./eventSyncer.js')
 
-
-var loki = require('lokijs')
-//var db = new loki('loki.json', {autosave: true, autoload: true})
-
-var db = new loki('phoenix.db', {
-  autoload: true,
-  autoloadCallback: databaseInitialize,
-  autosave: true,
-  autosaveInterval: 2000 // save every four seconds for our example
-})
-//db.loadDatabase()
-
 const events = new Events()
-const simulator = new Simulator(events);
-const eventSyncer = new EventSyncer(db, events);
+const eventSyncer = new EventSyncer(events);
 
-function databaseInitialize() {
-  let children = db.getCollection('children')
-  if (!children) {
-    children = db.addCollection('children')
-    db.saveDatabase()
-  }
-  let tracked = db.getCollection('tracked')
-  if (!tracked) {
-    tracked = db.addCollection('tracked')
-    db.saveDatabase()
-  }
-  run()
-}
+eventSyncer.init(run);
 
 function run() {
-  let children = db.getCollection('children')
-  let tracked = db.getCollection('tracked')
-
-  process.on('exit', function () {
-    db.close()
-  });
-
-  let dbChanges = fromEvent(events, "updateDB")
-
-  dbChanges.pipe(throttle(val => interval(400))).subscribe(() => {
-    console.dir("saving database...")
-    db.saveDatabase()
-  })
-
   let myscan = scan((acc, curr) => {
     acc.push(curr);
     if (acc.length > 4) {
@@ -65,5 +26,6 @@ function run() {
     console.dir("current value is " + v)
   })
 
+  const simulator = new Simulator(events);
   simulator.emitEvents()
 }