Instance_state.java

package emil.stupiec;

import java.util.ArrayList;
import java.util.List;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.PropertiesCredentials;
import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.AmazonEC2Client;
import com.amazonaws.services.ec2.model.DescribeInstancesRequest;
import com.amazonaws.services.ec2.model.DescribeInstancesResult;

public class Instance_state{
	private static AmazonEC2 ec2;
	private static DescribeInstancesResult describe_instances_result;
	private static DescribeInstancesRequest describe_instances_request;
	private static void initialize_aws_variables(String instance_id) throws Exception {
		AWSCredentials credentials = new PropertiesCredentials(
				Instance_runner.class.getResourceAsStream("../../AwsCredentials.properties"));
        ec2 = new AmazonEC2Client(credentials);
        ec2.setEndpoint("ec2.eu-west-1.amazonaws.com");
        describe_instances_request=new DescribeInstancesRequest();
        List<String> instance_ids=new ArrayList<String>();
        instance_ids.add(instance_id);
        describe_instances_request.setInstanceIds(instance_ids);
	}
	public String return_state(String instance_id) throws Exception{
		initialize_aws_variables(instance_id);
		describe_instances_result=ec2.describeInstances(describe_instances_request);
		return describe_instances_result.getReservations().get(0).getInstances().get(0).getState().getName();
	}
}