Работа над WebWorker и DbCreator

server/core/WorkerState.js

@@ -0,0 +1,62 @@
+const utils = require('./utils');
+
+const cleanInterval = 3600; //sec
+const cleanAfterLastModified = cleanInterval - 60; //sec
+
+let instance = null;
+
+//singleton
+class WorkerState {
+    constructor() {
+        if (!instance) {
+            this.states = {};
+            this.cleanStates();
+            instance = this;
+        }
+
+        return instance;
+    }
+
+    generateWorkerId() {
+        return utils.randomHexString(20);
+    }
+
+    getControl(workerId) {
+        return {
+            set: state => this.setState(workerId, state),
+            finish: state => this.finishState(workerId, state),
+            get: () => this.getState(workerId),
+        };
+    }
+
+    setState(workerId, state) {
+        this.states[workerId] = Object.assign({}, this.states[workerId], state, {
+            workerId, 
+            lastModified: Date.now()
+        });
+    }
+
+    finishState(workerId, state) {
+        this.states[workerId] = Object.assign({}, this.states[workerId], state, {
+            workerId,
+            state: 'finish',
+            lastModified: Date.now()
+        });
+    }
+
+    getState(workerId) {
+        return this.states[workerId];
+    }
+
+    cleanStates() {
+        const now = Date.now();
+        for (let workerID in this.states) {
+            if ((now - this.states[workerID].lastModified) >= cleanAfterLastModified*1000) {
+                delete this.states[workerID];
+            }
+        }
+        setTimeout(this.cleanStates.bind(this), cleanInterval*1000);
+    }
+}
+
+module.exports = WorkerState;