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Licensed to jclouds, Inc. (jclouds) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. jclouds licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
 
 package org.jclouds.elb.loadbalancer.strategy;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Predicates.in;
 import static com.google.common.base.Predicates.not;
 import static com.google.common.collect.Iterables.transform;
 import static com.google.common.collect.Sets.filter;
 import static org.jclouds.aws.util.AWSUtils.getRegionFromLocationOrNull;
 
 import java.util.Set;
 
 
 

Author(s):
Adrian Cole
 
    @Resource
    protected Logger logger = .;
    protected final ELBApi api;
 
    @Inject
    protected ELBLoadBalanceNodesStrategy(ELBApi api,
             Function<LoadBalancerInRegionLoadBalancerMetadataconverter) {
       this. = checkNotNull(api"api");
       this. = checkNotNull(converter"converter");
    }
 
    @Override
    public LoadBalancerMetadata createLoadBalancerInLocation(Location locationString nameString protocol,
             int loadBalancerPortint instancePortIterable<? extends NodeMetadatanodes) {
       checkNotNull(location"location");
       String region = getRegionFromLocationOrNull(location);
 
       Set<StringzonesDesired = ImmutableSet.copyOf(transform(nodesnew Function<NodeMetadataString>() {
 
          @Override
          public String apply(NodeMetadata from) {
             return from.getLocation().getId();
          }
       }));
 
       .debug(">> creating loadBalancer(%s) in zones(%s)"namezonesDesired);
       try {
                   name,
                   ImmutableSet.of(Listener.builder().port(loadBalancerPort).instancePort(instancePort)
                            .protocol(Protocol.valueOf(protocol)).build()), zonesDesired);
          .debug("<< created loadBalancer(%s) dnsName(%s)"namednsName);
       } catch (IllegalStateException e) {
          .debug("<< converging zones(%s) in loadBalancer(%s)"zonesDesiredname);
          Set<StringcurrentZones = .getLoadBalancerApi().get(name).getAvailabilityZones();
          Set<StringzonesToAdd = Sets.difference(zonesDesiredcurrentZones);
          if (zonesToAdd.size() > 0)
             currentZones = .getAvailabilityZoneApi().addAvailabilityZonesToLoadBalancer(zonesToAddname);
          Set<StringzonesToRemove = Sets.difference(currentZoneszonesDesired);
          if (zonesToRemove.size() > 0)
             .getAvailabilityZoneApi().removeAvailabilityZonesFromLoadBalancer(zonesToRemovename);
       }
      Set<StringinstanceIds = ImmutableSet.copyOf(transform(nodesnew Function<NodeMetadataString>() {
         @Override
         public String apply(NodeMetadata from) {
            return from.getProviderId();
         }
      }));
      .debug(">> converging loadBalancer(%s) to instances(%s)"nameinstanceIds);
      Set<StringregisteredInstanceIds = .getInstanceApiForRegion(region).registerInstancesWithLoadBalancer(
               instanceIdsname);
      Set<StringinstancesToRemove = filter(registeredInstanceIdsnot(in(instanceIds)));
      if (instancesToRemove.size() > 0) {
         .debug(">> deregistering instances(%s) from loadBalancer(%s)"instancesToRemovename);
         .getInstanceApiForRegion(region).deregisterInstancesFromLoadBalancer(instancesToRemovename);
      }
      .debug("<< converged loadBalancer(%s) "name);
      return .apply(new LoadBalancerInRegion(.getLoadBalancerApiForRegion(region).get(name), region));
   }
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