Connection Store Refactor (#4632)

* various clean ups

* formatting

* remove linting

* formatting

* IConfigurationService is even better

* messing with connection config tests

* update tests

* formatting

* foramtting

* remove unused code

* add more tests

* working through tests

* formatting

* more factoring of connection store and increase code coverage

* formatting

* fix tests

src/sql/base/common/map.ts

@@ -15,3 +15,48 @@ export function toObject<V>(map: Map<string, V>): { [key: string]: V } {
 	}
 	return {};
 }
+
+export class ReverseLookUpMap<K, V> {
+	private forward = new Map<K, V>();
+	private reverse = new Map<V, K>();
+
+	public clear(): void {
+		this.forward.clear();
+		this.reverse.clear();
+	}
+
+	public delete(key: K): boolean {
+		let reverseKey = this.forward.get(key);
+		return this.forward.delete(key) && this.reverse.delete(reverseKey);
+	}
+
+    public forEach(callbackfn: (value: V, index: K, map: Map<K, V>) => void, thisArg?: any): void {
+		this.forward.forEach(callbackfn, thisArg);
+	}
+
+	public get(key: K): V {
+		return this.forward.get(key);
+	}
+
+	public reverseGet(key: V): K {
+		return this.reverse.get(key);
+	}
+
+	public has(key: K): boolean {
+		return this.forward.has(key);
+	}
+
+	public reverseHas(key: V): boolean {
+		return this.reverse.has(key);
+	}
+
+	public set(key: K, value: V): ReverseLookUpMap<K, V> {
+		this.forward.set(key, value);
+		this.reverse.set(value, key);
+		return this;
+	}
+
+	public get size(): number {
+		return this.forward.size;
+	}
+}