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Common utility classes for building Amazon AWS-based cloud pools.

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package com.elastisys.scale.cloudpool.aws.commons.requests.ec2;

import java.util.concurrent.Callable;

import com.amazonaws.AmazonClientException;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.services.ec2.model.DescribeSpotInstanceRequestsRequest;
import com.amazonaws.services.ec2.model.DescribeSpotInstanceRequestsResult;
import com.amazonaws.services.ec2.model.SpotInstanceRequest;

/**
 * A {@link Callable} task that, when executed, requests meta data for a
 * particular AWS EC2 {@link SpotInstanceRequest} in a region.
 */
public class GetSpotInstanceRequest extends AmazonEc2Request {

    /** The identifier of the requested {@link SpotInstanceRequest}. */
    private final String spotInstanceRequestId;

    /**
     * Constructs a new {@link GetSpotInstanceRequest} task that will fetch a
     * particular {@link SpotInstanceRequest} in the region that match any of
     * the specified filters.
     *
     * @param awsCredentials
     *            The AWS security credentials to the account.
     * @param region
     *            The AWS region of interest.
     * @param clientConfig
     *            Client configuration options such as connection timeout, etc.
     * @param spotInstanceRequestId
     *            The identifier of the requested {@link SpotInstanceRequest}.
     */
    public GetSpotInstanceRequest(AWSCredentials awsCredentials, String region, ClientConfiguration clientConfig,
            String spotInstanceRequestId) {
        super(awsCredentials, region, clientConfig);
        this.spotInstanceRequestId = spotInstanceRequestId;
    }

    @Override
    public SpotInstanceRequest call() throws AmazonClientException {
        DescribeSpotInstanceRequestsRequest request = new DescribeSpotInstanceRequestsRequest();
        request.withSpotInstanceRequestIds(this.spotInstanceRequestId);
        DescribeSpotInstanceRequestsResult result = getClient().getApi().describeSpotInstanceRequests(request);
        return result.getSpotInstanceRequests().get(0);
    }
}