com.elastisys.scale.cloudpool.aws.commons.requests.autoscaling.GetAutoScalingGroup Maven / Gradle / Ivy

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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.AutoScalingGroup;
import com.amazonaws.services.autoscaling.model.DescribeAutoScalingGroupsRequest;
import com.amazonaws.services.autoscaling.model.DescribeAutoScalingGroupsResult;

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

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

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

	@Override
	public AutoScalingGroup call() {
		DescribeAutoScalingGroupsRequest request = new DescribeAutoScalingGroupsRequest()
				.withAutoScalingGroupNames(this.groupName);
		DescribeAutoScalingGroupsResult result = getClient().getApi()
				.describeAutoScalingGroups(request);
		List autoScalingGroups = result
				.getAutoScalingGroups();
		if (autoScalingGroups.isEmpty()) {
			throw new IllegalArgumentException(
					format("Auto Scaling Group '%s' doesn't exist in region '%s'.",
							this.groupName, getClient().getRegion()));
		}
		return getOnlyElement(autoScalingGroups);
	}

}