add comments and sample code for usage with ServiceLifecycle

Author: sebsto

Examples/quoteapi/Sources/QuoteAPI/QuoteService.swift

@@ -16,6 +16,7 @@
 import Foundation
 import OpenAPIRuntime
 import OpenAPILambda
+// import ServiceLifecycle
 
 @main
 struct QuoteServiceImpl: APIProtocol, OpenAPILambdaHttpApi {
@@ -25,8 +26,28 @@ struct QuoteServiceImpl: APIProtocol, OpenAPILambdaHttpApi {
     }
 
     static func main() async throws {
-        let lambdaRuntime = try LambdaRuntime(body: Self.handler())
-        try await lambdaRuntime.run()
+        // when you just need to run the Lambda function, call run()
+        try await Self.run()
+
+        // when you need to have access to the runtime for advanced usage (dependency injection, Service LifeCycle, etc)
+        // create the LambdaRuntime and run it
+
+        // here is an example with Service Lifecycle
+        // Add the follwing in Package.swift
+        //    .package(url: "https://github.com/swift-server/swift-service-lifecycle.git", from: "2.6.0"),
+        // and
+        //    .product(name: "ServiceLifecycle", package: "swift-service-lifecycle"),
+        // Add `import ServiceLifecycle` at the top of this file`
+
+        // let lambdaRuntime = try LambdaRuntime(body: Self.handler())
+        // try await lambdaRuntime.run()
+        // let serviceGroup = ServiceGroup(
+        //     services: [lambdaRuntime],
+        //     gracefulShutdownSignals: [.sigterm],
+        //     cancellationSignals: [.sigint],
+        //     logger: Logger(label: "ServiceGroup")
+        // )
+        // try await serviceGroup.run()
     }
 
     func getQuote(_ input: Operations.getQuote.Input) async throws -> Operations.getQuote.Output {