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+/*
+ * SonarQube
+ * Copyright (C) 2009-2021 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+import * as React from 'react';
+import { Alert } from '../components/ui/Alert';
+import { IS_SSR } from '../helpers/init';
+import { translate } from '../helpers/l10n';
+import { requestTryAndRepeatUntil } from '../helpers/request';
+
+export function lazyLoadComponent<T extends React.ComponentType<any>>(
+ factory: () => Promise<{ default: T }>,
+ displayName?: string
+) {
+ const LazyComponent = React.lazy(() =>
+ requestTryAndRepeatUntil(factory, { max: 2, slowThreshold: 2 }, () => true)
+ );
+
+ function LazyComponentWrapper(props: React.ComponentProps<T>) {
+ if (IS_SSR) {
+ return null;
+ }
+ return (
+ <LazyErrorBoundary>
+ <React.Suspense fallback={null}>
+ <LazyComponent {...props} />
+ </React.Suspense>
+ </LazyErrorBoundary>
+ );
+ }
+
+ LazyComponentWrapper.displayName = displayName;
+ return LazyComponentWrapper;
+}
+
+interface ErrorBoundaryProps {
+ children: React.ReactNode;
+}
+
+interface ErrorBoundaryState {
+ hasError: boolean;
+}
+
+export class LazyErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoundaryState> {
+ state: ErrorBoundaryState = { hasError: false };
+
+ static getDerivedStateFromError() {
+ // Update state so the next render will show the fallback UI.
+ return { hasError: true };
+ }
+
+ render() {
+ if (this.state.hasError) {
+ return <Alert variant="error">{translate('default_error_message')}</Alert>;
+ }
+ return this.props.children;
+ }
+}