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10 // active state.

for (SpotInstanceRequest requestResponse : requestResponses) {

System.out.println("Created Spot Request: "+requestResponse.getSpotIn

stanceRequestId());

spotInstanceRequestIds.add(requestResponse.getSpotInstanceRequestId());

}

To monitor your request ID, call the describeSpotInstanceRequests method to determine the state

of the request.Then loop until the request is not in the "open" state. Note that we monitor for a state of

not "open", rather a state of, say, "active", because the request can go straight to "closed" if there is a

problem with your request arguments.The following code example provides the details of how to

accomplish this task.

1 // Create a variable that will track whether there are any

// requests still in the open state.

boolean anyOpen;

5 do {

// Create the describeRequest object with all of the request ids

// to monitor (e.g. that we started).

DescribeSpotInstanceRequestsRequest describeRequest = new DescribeSpot

InstanceRequestsRequest();

describeRequest.setSpotInstanceRequestIds(spotInstanceRequestIds);

// Initialize the anyOpen variable to false - which assumes there

// are no requests open unless we find one that is still open.

anyOpen=false;

15 try {

// Retrieve all of the requests we want to monitor.

DescribeSpotInstanceRequestsResult describeResult = ec2.describeS

potInstanceRequests(describeRequest);

List<SpotInstanceRequest> describeResponses = describeResult.get

SpotInstanceRequests();

20 // Look through each request and determine if they are all in

// the active state.

for (SpotInstanceRequest describeResponse : describeResponses) {

// If the state is open, it hasn't changed since we attempted

// to request it. There is the potential for it to transition

25 // almost immediately to closed or cancelled so we compare

// against open instead of active.

if (describeResponse.getState().equals("open")) {

anyOpen = true;

break;

30 }

}

} catch (AmazonServiceException e) {

// If we have an exception, ensure we don't break out of

// the loop. This prevents the scenario where there was

35 // blip on the wire.

anyOpen = true;

}

try {

40 // Sleep for 60 seconds.

Thread.sleep(60*1000);

Version v1.0.0

AWS SDK for Java Developer Guide

Tutorial: Amazon EC2 Spot Instances

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Amazon AWS SDK Guide de l'utilisateur Page 45

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