User guide

}

} while (anyOpen);

Using the instance IDs, stored in the ArrayList, terminate any running instances using the following

code snippet.

1 try {

// Terminate instances.

TerminateInstancesRequest terminateRequest = new TerminateInstances

Request(instanceIds);

ec2.terminateInstances(terminateRequest);

5 } catch (AmazonServiceException e) {

// Write out any exceptions that may have occurred.

System.out.println("Error terminating instances");

System.out.println("Caught Exception: " + e.getMessage());

System.out.println("Reponse Status Code: " + e.getStatusCode());

10 System.out.println("Error Code: " + e.getErrorCode());

System.out.println("Request ID: " + e.getRequestId());

}

Bringing It All Together

To bring this all together, we provide a more object-oriented approach that combines the preceding steps

we showed: initializing the EC2 Client, submitting the Spot Request, determining when the Spot Requests

are no longer in the open state, and cleaning up any lingering Spot request and associated instances.

We create a class called Requests that performs these actions.

We also create a GettingStartedApp class, which has a main method where we perform the high level

function calls. Specifically, we initialize the Requests object described previously. We submit the Spot

Instance request. Then we wait for the Spot request to reach the "Active" state. Finally, we clean up the

requests and instances.

The complete source code is available for download at GitHub.

Congratulations! You have just completed the getting started tutorial for developing Spot Instance software

with the AWS SDK for Java.

Next Steps

We recommend that you take the Java Developers: Tutorial: Advanced Amazon EC2 Spot Request

Management (p. 45).

Tutorial: Advanced Amazon EC2 Spot Request

Management

Overview

Spot Instances allow you to bid on unused Amazon Elastic Compute Cloud (Amazon EC2) capacity and

run those instances for as long as your bid exceeds the current Spot Price. Amazon EC2 changes the

Spot Price periodically based on supply and demand. Customers whose bids meet or exceed the Spot

Price gain access to the available Spot Instances. Like On-Demand Instances and Reserved Instances,

Spot Instances provide you an additional option for obtaining more compute capacity.

Version v1.0.0

AWS SDK for Java Developer Guide

Tutorial: Advanced Amazon EC2 Spot Request

Management