minor improvements to elastic load balancer functionality

aws/core/src/main/java/org/jclouds/aws/ec2/compute/strategy/EC2LoadBalanceNodesStrategy.java

@@ -28,7 +28,7 @@ import javax.inject.Inject;
 import javax.inject.Named;
 import javax.inject.Singleton;
 
-import org.jclouds.aws.ec2.domain.AvailabilityZone;
+import org.jclouds.aws.ec2.util.EC2Utils;
 import org.jclouds.aws.ec2.util.EC2Utils.GetRegionFromLocation;
 import org.jclouds.aws.elb.ELBClient;
 import org.jclouds.compute.reference.ComputeServiceConstants;
@@ -61,15 +61,8 @@ public class EC2LoadBalanceNodesStrategy implements LoadBalanceNodesStrategy {
       String region = getRegionFromLocation.apply(location);
       String dnsName = new String();
       
-      // TODO: Fix temp hack
-      String availabilityZone = new String();
-      for (String az : AvailabilityZone.zones) {
-         if (az.startsWith(region))
-            availabilityZone = az;
-      }
-
       dnsName = elbClient.createLoadBalancerInRegion(region, name, protocol, loadBalancerPort,
-               instancePort, availabilityZone);
+               instancePort, EC2Utils.getAvailabilityZonesForRegion(region));
 
       List<String> instanceIdlist = new ArrayList<String>(instanceIds);
       String[] instanceIdArray = new String[instanceIdlist.size()];

aws/core/src/main/java/org/jclouds/aws/ec2/util/EC2Utils.java

@@ -22,7 +22,9 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.jclouds.http.HttpUtils.addFormParamTo;
 
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -55,6 +57,17 @@ public class EC2Utils {
       }
    }
    
+   public static String[] getAvailabilityZonesForRegion(String region)
+   {
+       Set<String> availabilityZones = new HashSet<String>();
+       for (String az : AvailabilityZone.zones) {
+          if (az.startsWith(region))
+              availabilityZones.add(az);
+       }
+       
+       return (String[])availabilityZones.toArray(new String[availabilityZones.size()]);
+   }
+
    public static void indexStringArrayToFormValuesWithPrefix(HttpRequest request, String prefix,
             Object input) {
       checkArgument(checkNotNull(input, "input") instanceof String[],

aws/core/src/main/java/org/jclouds/aws/elb/ELBAsyncClient.java

@@ -30,6 +30,7 @@ import javax.ws.rs.Path;
 
 import org.jclouds.aws.ec2.xml.CreateLoadBalancerResponseHandler;
 import org.jclouds.aws.ec2.xml.RegisterInstancesWithLoadBalancerResponseHandler;
+import org.jclouds.aws.elb.binders.BindAvailabilityZonesToIndexedFormParams;
 import org.jclouds.aws.elb.binders.BindELBInstanceIdsToIndexedFormParams;
 import org.jclouds.aws.elb.domain.LoadBalancer;
 import org.jclouds.aws.elb.xml.DescribeLoadBalancersResponseHandler;
@@ -69,7 +70,7 @@ public interface ELBAsyncClient {
             @FormParam("Listeners.member.1.Protocol") String protocol,
             @FormParam("Listeners.member.1.LoadBalancerPort") int loadBalancerPort,
             @FormParam("Listeners.member.1.InstancePort") int instancePort,
-            @FormParam("AvailabilityZones.member.1") String availabilityZone);
+            @BinderParam(BindAvailabilityZonesToIndexedFormParams.class) String... availabilityZones);
 
    /**
     * @see ELBClient#deleteLoadBalancerInRegion

aws/core/src/main/java/org/jclouds/aws/elb/ELBClient.java

@@ -44,11 +44,13 @@ public interface ELBClient {
     *           Port for the load balancer to listen on
     * @param instancePort
     *           Port to forward the request to
+    * @param availabilityZones
+    *           load balancer availability zones
     * @return dns the DNS name for the load balancer
     * @see <a href="http://docs.amazonwebservices.com/ElasticLoadBalancing/latest/DeveloperGuide/"
     */
    String createLoadBalancerInRegion(@Nullable String region, String name, String protocol,
-            int loadBalancerPort, int instancePort, String availabilityZone);
+            int loadBalancerPort, int instancePort, String... availabilityZones);
 
    /**
     * Delete load balancer