Java tutorial
/** * This file is part of ElasticDroid. * * ElasticDroid is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * ElasticDroid is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License * along with ElasticDroid. If not, see <http://www.gnu.org/licenses/>. * * Authored by Siddhu Warrier on 14 Nov 2010 */ package org.elasticdroid.model; import java.util.HashMap; import org.elasticdroid.model.tpl.GenericModel; import org.elasticdroid.tpl.GenericListActivity; import org.elasticdroid.utils.AWSConstants; import org.elasticdroid.utils.AWSConstants.InstanceStateConstants; import android.util.Log; import com.amazonaws.AmazonClientException; import com.amazonaws.AmazonServiceException; import com.amazonaws.auth.BasicAWSCredentials; import com.amazonaws.services.ec2.AmazonEC2Client; import com.amazonaws.services.ec2.model.DescribeInstancesResult; import com.amazonaws.services.ec2.model.Instance; import com.amazonaws.services.ec2.model.Reservation; /** * @author Siddhu Warrier * * 14 Nov 2010 */ public class EC2DashboardModel extends GenericModel<HashMap<?, ?>, Void, Object> { /** * * @param genericActivity */ public EC2DashboardModel(GenericListActivity genericActivity) { super(genericActivity); } /** * Gets the data to populate the EC2 Dashboard with in the background thread, and loads it into * a Hashtable<String, Integer>. * * @param This method accepts *ONE* Hashtable<String, String> of LoginDetails arguments. The * required keys are as follows (anything else is ignored): * <ul> * <li> accessKey: The accesskey for the AWS/AWS IAM account used.</li> * <li> secretAccessKey: The secretAccessKey for the AWS/AWS IAM account used.</li> * <li> endpoint: AWS Endpoint for the selected region (@see {@link AWSConstants.EndPoints}</li> * </ul> * If you're missing any of these keys, AmazonServiceExceptions will be thrown. This shouldn't * be visible to the end-user as this is a programmer fault!!! :P * * @return This method can return: * <ul> * <li>{@link IllegalArgumentException}: If there are too many/few arguments, or the keys are * incorrect. Only one Hashtable<String, String> accepted.</li> * <li>{@link Hashtable<String, Integer}: data to populate dashboard with. * <ul> * <li><i>runningInstances:</i> The number of running instances for the user in the current * region</li> * <li><i>stoppedInstances:</i> The number of stopped instances for the user in the current * region</li> * <li><i>elasticIp:</i> The number of elastic IPs owned by the user (in the current region) * </li> * <li><i>securityGroups:</i> The number of security groups avail 2 the user (in the current * region)</li> * <li><i>keyPairs:</i> The number of keypairs avail 2 the user (in the current * region)</li> * </ul> * </li> * </ul> */ @SuppressWarnings("unchecked") @Override protected Object doInBackground(HashMap<?, ?>... params) { HashMap<String, String> connectionData; HashMap<String, Integer> dashboardData; //we accept only one param, but AsyncTask forces us to potentially accept //a whole bloody lot of them. :P if (params.length != 1) { return new IllegalArgumentException( "Only one Hashtable<String,String> parameter " + "should be passed."); } connectionData = (HashMap<String, String>) params[0]; //convenience variable, so that //i dont have to keep typing params[0] everywhere in this method.;) Log.v(this.getClass().getName(), "Getting EC2 dashboard data..."); //prepare to get the dashboard data! //create credentials using the BasicAWSCredentials class BasicAWSCredentials credentials = new BasicAWSCredentials(connectionData.get("accessKey"), connectionData.get("secretAccessKey")); //create Amazon EC2 Client object, and set tye end point to the region. params[3] //contains endpoint AmazonEC2Client amazonEC2Client = new AmazonEC2Client(credentials); amazonEC2Client.setEndpoint(connectionData.get("endpoint")); //initialise result holder variable dashboardData = new HashMap<String, Integer>(); try { //get the number of running and stopped instances DescribeInstancesResult instances = amazonEC2Client.describeInstances(); int numOfRunningInstances = 0; int numOfStoppedInstances = 0; //get the list of reservations in the results for (Reservation reservation : instances.getReservations()) { //for each reservation, get the list of instances associated for (Instance instance : reservation.getInstances()) { if (instance.getState().getCode().byteValue() == InstanceStateConstants.RUNNING) { numOfRunningInstances++; } else if (instance.getState().getCode().byteValue() == InstanceStateConstants.STOPPED) { numOfStoppedInstances++; } } } dashboardData.put("runningInstances", numOfRunningInstances); dashboardData.put("stoppedInstances", numOfStoppedInstances); //get the list of elastic Ips. dashboardData.put("elasticIp", amazonEC2Client.describeAddresses().getAddresses().size()); //get the list of security groups dashboardData.put("securityGroups", amazonEC2Client.describeSecurityGroups().getSecurityGroups().size()); //get the list of keypairs dashboardData.put("keyPairs", amazonEC2Client.describeKeyPairs().getKeyPairs().size()); } catch (AmazonServiceException amazonServiceException) { return amazonServiceException; } catch (AmazonClientException amazonClientException) { return amazonClientException; } return dashboardData; } }