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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.autoscaling;

import static com.google.common.collect.Iterables.getOnlyElement;
import static java.lang.String.format;

import java.util.List;
import java.util.concurrent.Callable;

import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.services.autoscaling.model.DescribeLaunchConfigurationsRequest;
import com.amazonaws.services.autoscaling.model.DescribeLaunchConfigurationsResult;
import com.amazonaws.services.autoscaling.model.LaunchConfiguration;

/**
 * A {@link Callable} task that, when executed, requests details about a
 * particular AWS Auto Scaling Launch Configuration in a region.
 */
public class GetLaunchConfiguration
		extends AmazonAutoScalingRequest {

	/** The name of the {@link LaunchConfiguration} of interest. */
	private final String launchConfigurationName;

	/**
	 * Constructs a new {@link GetLaunchConfiguration} task.
	 *
	 * @param awsCredentials
	 * @param region
	 * @param clientConfig
	 *            Client configuration options such as connection timeout, etc.
	 * @param launchConfigurationName
	 */
	public GetLaunchConfiguration(AWSCredentials awsCredentials, String region,
			ClientConfiguration clientConfig, String launchConfigurationName) {
		super(awsCredentials, region, clientConfig);
		this.launchConfigurationName = launchConfigurationName;
	}

	@Override
	public LaunchConfiguration call() {
		DescribeLaunchConfigurationsRequest request = new DescribeLaunchConfigurationsRequest()
				.withLaunchConfigurationNames(this.launchConfigurationName);
		DescribeLaunchConfigurationsResult result = getClient().getApi()
				.describeLaunchConfigurations(request);
		List launchConfigurations = result
				.getLaunchConfigurations();
		if (launchConfigurations.isEmpty()) {
			throw new IllegalArgumentException(format(
					"Launch Configuration '%s' doesn't exist in region '%s'.",
					this.launchConfigurationName, getClient().getRegion()));
		}
		return getOnlyElement(launchConfigurations);
	}

}