fix: Fixed high cpu usage by parallel svn processes (close JohnstonCode#463)

Author: edgardmessias

src/decorators.ts

@@ -104,3 +104,17 @@ export function debounce(delay: number): Function {
     };
   });
 }
+
+const _seqList: { [key: string]: any } = {};
+
+export function globalSequentialize(name: string): Function {
+  return decorate((fn, key) => {
+    return function(...args: any[]) {
+      const currentPromise =
+        (_seqList[name] as Promise<any>) || Promise.resolve(null);
+      const run = async () => fn.apply(this, args);
+      _seqList[name] = currentPromise.then(run, run);
+      return _seqList[name];
+    };
+  });
+}

src/repository.ts

@@ -25,7 +25,7 @@ import {
   Status,
   SvnUriAction
 } from "./common/types";
-import { debounce, memoize, throttle } from "./decorators";
+import { debounce, globalSequentialize, memoize, throttle } from "./decorators";
 import { configuration } from "./helpers/configuration";
 import OperationsImpl from "./operationsImpl";
 import { PathNormalizer } from "./pathNormalizer";
@@ -427,6 +427,7 @@ export class Repository implements IRemoteRepository {
   }
 
   @throttle
+  @globalSequentialize("updateModelState")
   public async updateModelState(checkRemoteChanges: boolean = false) {
     const changes: any[] = [];
     const unversioned: any[] = [];