feat(gamelift): add GameSessionQueue L2 Construct for GameLift

packages/@aws-cdk/aws-gamelift/README.md

@@ -449,6 +449,33 @@ new cloudwatch.Alarm(this, 'Alarm', {
 See: [Monitoring Using CloudWatch Metrics](https://docs.aws.amazon.com/gamelift/latest/developerguide/monitoring-cloudwatch.html)
 in the *Amazon GameLift Developer Guide*.
 
+## Game session queue
+
+The game session queue is the primary mechanism for processing new game session
+requests and locating available game servers to host them. Although it is
+possible to request a new game session be hosted on specific fleet or location.
+
+The `GameSessionQueue` resource creates a placement queue that processes requests for
+new game sessions. A queue uses FleetIQ algorithms to determine the best placement
+locations and find an available game server, then prompts the game server to start a
+new game session. Queues can have destinations (GameLift fleets or aliases), which
+determine where the queue can place new game sessions. A queue can have destinations
+with varied fleet type (Spot and On-Demand), instance type, and AWS Region.
+
+```ts
+declare const fleet: gamelift.BuildFleet;
+declare const alias: gamelift.Alias;
+
+const queue = new gamelift.GameSessionQueue(this, 'GameSessionQueue', {
+  gameSessionQueueName: 'my-queue-name',
+  destinations: [fleet]
+});
+queue.addDestination(alias);
+```
+
+See [Setting up GameLift queues for game session placement](https://docs.aws.amazon.com/gamelift/latest/developerguide/realtime-script-uploading.html)
+in the *Amazon GameLift Developer Guide*.
+
 ## GameLift FleetIQ
 
 The GameLift FleetIQ solution is a game hosting layer that supplements the full

packages/@aws-cdk/aws-gamelift/lib/alias.ts

@@ -1,12 +1,13 @@
 import * as cdk from '@aws-cdk/core';
 import { Construct } from 'constructs';
 import { IFleet } from './fleet-base';
+import { IGameSessionQueueDestination } from './game-session-queue';
 import { CfnAlias } from './gamelift.generated';
 
 /**
  * Represents a Gamelift Alias for a Gamelift fleet destination.
  */
-export interface IAlias extends cdk.IResource {
+export interface IAlias extends cdk.IResource, IGameSessionQueueDestination {
 
   /**
      * The Identifier of the alias.
@@ -106,6 +107,12 @@ export abstract class AliasBase extends cdk.Resource implements IAlias {
    * The ARN of the alias
    */
   public abstract readonly aliasArn: string;
+  /**
+   * The ARN to put into the destination field of a game session queue
+   */
+  public get resourceArnForDestination() {
+    return this.aliasArn;
+  }
 }
 
 /**

packages/@aws-cdk/aws-gamelift/lib/fleet-base.ts

@@ -4,6 +4,7 @@ import * as iam from '@aws-cdk/aws-iam';
 import * as cdk from '@aws-cdk/core';
 import { Construct } from 'constructs';
 import { Alias, AliasOptions } from './alias';
+import { IGameSessionQueueDestination } from './game-session-queue';
 import { GameLiftMetrics } from './gamelift-canned-metrics.generated';
 import { CfnFleet } from './gamelift.generated';
 
@@ -140,7 +141,7 @@ export interface ResourceCreationLimitPolicy {
 /**
  * Represents a Gamelift fleet
  */
-export interface IFleet extends cdk.IResource, iam.IGrantable {
+export interface IFleet extends cdk.IResource, iam.IGrantable, IGameSessionQueueDestination {
   /**
    * The Identifier of the fleet.
    *
@@ -535,6 +536,13 @@ export abstract class FleetBase extends cdk.Resource implements IFleet {
     }).attachTo(this);
   }
 
+  /**
+   * The ARN to put into the destination field of a game session queue
+   */
+  public get resourceArnForDestination() {
+    return this.fleetArn;
+  }
+
   /**
    * Adds a remote locations to deploy additional instances to and manage as part of the fleet.
    *