Is there any example code for Java

#1

Hi need to write lambda function for Gamelift StartMatchMaking,

Is there any example code for gamlift, how to init and call functions?

https://docs.aws.amazon.com/gamelift/latest/apireference/API_StartMatchmaking.html

#2

Hi @VinK, Thanks for reaching out. Here’s the AWS document for the Java API:

https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/gamelift/AmazonGameLift.html#startMatchmaking-com.amazonaws.services.gamelift.model.StartMatchmakingRequest-

#3

Hi Junbo,

I meant by example code… something like below,

https://docs.aws.amazon.com/sdk-for-java/v2/developer-guide/advanced-topics.html

In my SAML app, I got maven dependency added

com.amazonaws aws-java-sdk-gamelift 1.11.831

But not sure where to go from there.

#4

@VinK - theres a simple example here in .Net that should walk you through whats required and should be simple to convert to Java: https://aws.amazon.com/blogs/gametech/creating-a-battle-royale-game-using-unity-and-amazon-gamelift/

And this has python examples: https://github.com/aws-samples/aws-gamelift-sample

I’m not sure there is an existing up-to-date Java lambda example out there.

From memory (and I’m free typing this, so apologies for code mistakes), startMatchmaking is just a matter of packing up the request object (as with any other AWS call) ie:

public StartMatchmakingResult startMatchmaking( ... pass in what you need) {

        final String ticketId = randomUUID().toString();
   
        // Need to fill this with what you need
        Map<String,AttributeValue> attributes = Collections.emptyMap()

        try {
            return getClient(configuration).startMatchmaking(
                    new StartMatchmakingRequest()
                            .withConfigurationName(configurationName)
                            .withTicketId(ticketId)
                            .withPlayers(
                                    playerIds.stream()
                                            .map((id) -> new Player()
                                                    .withPlayerId(id)
                                                    .withPlayerAttributes(convertedAttributes)
...
                                            )
                                            .collect(toList())
                            )
            );
       // handle errors
        } catch (final NotFoundException  e) {
        } 
        } catch (final InvalidRequestException e) {
        }
    }

I would work out how to write/deploy the simplest Java lambda and build on its complexity from there ie start with describe-matchmaking or list-fleets for example.

Hope thats helpful