fix batch timer and use it for authors

frontend/ts/batch-timer.ts

@@ -12,7 +12,7 @@ export class BatchTimer {
   public queue(id: string, timeout: number){
     this._timer = new Date().getTime() + timeout;
     this._batch.push(id);
-    setTimeout(this.checkBatch, timeout);
+    setTimeout(this.checkBatch.bind(this), timeout);
   }
   
   private checkBatch() {

frontend/ts/thread-summary-element.ts

@@ -1,6 +1,7 @@
 import util from "./util"
 import { Message, Author } from "./message"
 import { AdapterState } from "./adapter"
+import { BatchTimer } from "./batch-timer"
 
 export class ThreadSummaryElement extends HTMLElement {
   static observedAttributes = [ "data-msg", "data-len", "data-author", "data-created", "data-latest", "data-new" ];
@@ -13,6 +14,8 @@ export class ThreadSummaryElement extends HTMLElement {
   private _latest: number = 0;
   private _new: boolean = false;
   
+  private _authorTimer: BatchTimer; 
+  
   constructor() {
     super();
         this.innerHTML = "<div class='thread_summary'><div class='thread_author'></div><div class='thread_text'></div><div class='thread_metadata'></div></div>"
@@ -20,6 +23,13 @@ export class ThreadSummaryElement extends HTMLElement {
     // adapter shouldn't change, just set it here
     this._adapter = this.getAttribute("data-adapter") ?? "";
     this.addEventListener("click", this.viewThread(this), false);
+    this._authorTimer = new BatchTimer((ids: string[])=>{
+    let url = `/api/adapters/${this._adapter}/fetch?entity_type=author`;
+    for (let id of ids) {
+      url += `&entity_id=${id}`;
+    }
+    util.authorizedFetch("GET", url, null)
+  });
   }
   
   connectedCallback() {
@@ -54,10 +64,7 @@ export class ThreadSummaryElement extends HTMLElement {
         if (next) {
           let authorData= datastore.profileCache.get(next);
           if (!authorData) {
-            util.authorizedFetch(
-              "GET", 
-              `/api/adapters/${this._adapter}/fetch?entity_type=author&entity_id=${next}`, 
-              null);
+            this._authorTimer.queue(next, 2000);
             this._author = <Author>{id: next};
             const threadAuthor = this.querySelector(".thread_author");
             if (threadAuthor) {