/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.elasticsearch.discovery.ec2;

import org.elasticsearch.cloud.aws.AwsEc2Service;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.common.collect.ImmutableList;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.discovery.zen.ZenDiscovery;
import org.elasticsearch.discovery.zen.ping.ZenPing;
import org.elasticsearch.discovery.zen.ping.ZenPingService;
import org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

/**
 * @author kimchy (shay.banon)
 */
public class Ec2Discovery extends ZenDiscovery {

    @Inject public Ec2Discovery(Settings settings, ClusterName clusterName, ThreadPool threadPool, TransportService transportService,
                                ClusterService clusterService, ZenPingService pingService, AwsEc2Service ec2Service) {
        super(settings, clusterName, threadPool, transportService, clusterService, pingService);
        if (settings.getAsBoolean("cloud.enabled", true)) {
            ImmutableList<? extends ZenPing> zenPings = pingService.zenPings();
            UnicastZenPing unicastZenPing = null;
            for (ZenPing zenPing : zenPings) {
                if (zenPing instanceof UnicastZenPing) {
                    unicastZenPing = (UnicastZenPing) zenPing;
                    break;
                }
            }
            // update the unicast zen ping to add cloud hosts provider
            // and, while we are at it, use only it and not the multicast for example
            unicastZenPing.addHostsProvider(new AwsEc2UnicastHostsProvider(settings, ec2Service.client()));
            pingService.zenPings(ImmutableList.of(unicastZenPing));
        }
    }
}

@@ -2325,32 +2325,78 @@
 %7D%0A            %7D%0A
+            if (unicastZenPing != null) %7B%0A    
             // u
@@ -2462,16 +2462,20 @@
         
+ 
+   
 // and, 
@@ -2544,32 +2544,36 @@
 ple%0A            
+   
+ 
 unicastZenPing.a
@@ -2664,16 +2664,20 @@
         
+    
 pingServ
@@ -2720,24 +2720,152 @@
 tZenPing));%0A
+            %7D else %7B%0A                logger.warn(%22failed to apply ec2 unicast discovery, no unicast ping found%22);%0A            %7D%0A
         %7D%0A  

add a warn and don't apply ec2 unicast discovery if not found (will not really happen)