First attempt package preload strategy

projects/common/src/fm/services/package-preload-strategy.service.ts

@@ -0,0 +1,31 @@
+import { Injectable} from '@angular/core';
+import { PreloadingStrategy,Route } from '@angular/router'
+import { Observable, EMPTY } from 'rxjs';
+import { PackageService} from './package.service';
+
+@Injectable({
+    providedIn: 'root',
+  })
+export class PackagePreloadStartegy extends PreloadingStrategy {
+
+    loading = new Set<Route>();
+
+    constructor(private packageService$:PackageService) {
+        super();
+    }
+
+    preload(route: Route, load: Function): Observable<any> {
+        if (this.loading.has(route)) {
+            // Don't preload the same route twice
+            return EMPTY;
+        }
+        if(route.data && route.data.package) {
+            if(this.packageService$.hasPackage(route.data.package)) {
+                console.debug(`Load module for package ${route.data.package}`)
+                this.loading.add(route);
+                return load()
+            }
+        }
+        return EMPTY;
+    }
+}