From 86a5cb27b77d370540a31f54d4f02def254d77d5 Mon Sep 17 00:00:00 2001
From: Charles Gagnon <chgagnon@microsoft.com>
Date: Tue, 2 Feb 2021 16:15:31 -0800
Subject: [PATCH] Add debounce to pg parameters search filter (#14140)

* Add debounce to pg parameters search filter

* Update tsconfig
---
 extensions/arc/src/common/utils.ts            | 32 +++++++++++++++++++
 .../postgres/postgresParametersPage.ts        | 18 +++++++----
 extensions/arc/tsconfig.json                  |  1 +
 3 files changed, 45 insertions(+), 6 deletions(-)

diff --git a/extensions/arc/src/common/utils.ts b/extensions/arc/src/common/utils.ts
index 95644b940e..43f97f903d 100644
--- a/extensions/arc/src/common/utils.ts
+++ b/extensions/arc/src/common/utils.ts
@@ -295,3 +295,35 @@ export async function tryExecuteAction<T>(action: () => T | PromiseLike<T>): Pro
 	}
 	return { result, error };
 }
+
+function decorate(decorator: (fn: Function, key: string) => Function): Function {
+	return (_target: any, key: string, descriptor: any) => {
+		let fnKey: string | null = null;
+		let fn: Function | null = null;
+
+		if (typeof descriptor.value === 'function') {
+			fnKey = 'value';
+			fn = descriptor.value;
+		} else if (typeof descriptor.get === 'function') {
+			fnKey = 'get';
+			fn = descriptor.get;
+		}
+
+		if (!fn || !fnKey) {
+			throw new Error('not supported');
+		}
+
+		descriptor[fnKey] = decorator(fn, key);
+	};
+}
+
+export function debounce(delay: number): Function {
+	return decorate((fn, key) => {
+		const timerKey = `$debounce$${key}`;
+
+		return function (this: any, ...args: any[]) {
+			clearTimeout(this[timerKey]);
+			this[timerKey] = setTimeout(() => fn.apply(this, args), delay);
+		};
+	});
+}
diff --git a/extensions/arc/src/ui/dashboards/postgres/postgresParametersPage.ts b/extensions/arc/src/ui/dashboards/postgres/postgresParametersPage.ts
index 7c9c227ea5..1ed853dab9 100644
--- a/extensions/arc/src/ui/dashboards/postgres/postgresParametersPage.ts
+++ b/extensions/arc/src/ui/dashboards/postgres/postgresParametersPage.ts
@@ -11,6 +11,7 @@ import { UserCancelledError } from '../../../common/api';
 import { IconPathHelper, cssStyles } from '../../../constants';
 import { DashboardPage } from '../../components/dashboardPage';
 import { EngineSettingsModel, PostgresModel } from '../../../models/postgresModel';
+import { debounce } from '../../../common/utils';
 
 export type ParametersModel = {
 	parameterName: string,
@@ -358,15 +359,20 @@ export class PostgresParametersPage extends DashboardPage {
 
 		this.disposables.push(
 			this.searchBox.onTextChanged(() => {
-				if (!this.searchBox!.value) {
-					this.parametersTable.data = this._parameters.map(p => [p.parameterName, p.valueContainer, p.description, p.resetButton]);
-				} else {
-					this.filterParameters(this.searchBox!.value);
-				}
+				this.onSearchFilter();
 			})
 		);
 	}
 
+	@debounce(500)
+	private onSearchFilter(): void {
+		if (!this.searchBox!.value) {
+			this.parametersTable.data = this._parameters.map(p => [p.parameterName, p.valueContainer, p.description, p.resetButton]);
+		} else {
+			this.filterParameters(this.searchBox!.value);
+		}
+	}
+
 	private filterParameters(search: string): void {
 		this.parametersTable.data = this._parameters
 			.filter(p => p.parameterName?.search(search) !== -1 || p.description?.search(search) !== -1)
@@ -375,7 +381,7 @@ export class PostgresParametersPage extends DashboardPage {
 
 	private handleOnTextChanged(component: azdata.InputBoxComponent, currentValue: string | undefined): boolean {
 		if (!component.valid) {
-			// If invalid value retun false and enable discard button
+			// If invalid value return false and enable discard button
 			this.discardButton!.enabled = true;
 			return false;
 		} else if (component.value === currentValue) {
diff --git a/extensions/arc/tsconfig.json b/extensions/arc/tsconfig.json
index 2c6d7abf5b..bd69e58723 100644
--- a/extensions/arc/tsconfig.json
+++ b/extensions/arc/tsconfig.json
@@ -2,6 +2,7 @@
 	"extends": "../shared.tsconfig.json",
 	"compileOnSave": true,
 	"compilerOptions": {
+		"experimentalDecorators": true,
 		"outDir": "./out",
 		"lib": [
 			"es6",