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The Azure Cloud plugin allows to use Azure API for the unicast discovery mechanism and add Azure storage repositories.
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 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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
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 */

package org.elasticsearch.plugin.cloud.azure;

import org.elasticsearch.cloud.azure.AzureModule;
import org.elasticsearch.common.inject.Module;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.discovery.DiscoveryModule;
import org.elasticsearch.discovery.azure.AzureDiscovery;
import org.elasticsearch.discovery.azure.AzureUnicastHostsProvider;
import org.elasticsearch.index.snapshots.blobstore.BlobStoreIndexShardRepository;
import org.elasticsearch.index.store.IndexStoreModule;
import org.elasticsearch.index.store.smbmmapfs.SmbMmapFsIndexStore;
import org.elasticsearch.index.store.smbsimplefs.SmbSimpleFsIndexStore;
import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.repositories.RepositoriesModule;
import org.elasticsearch.repositories.azure.AzureRepository;

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

import static org.elasticsearch.cloud.azure.AzureModule.isSnapshotReady;

/**
 *
 */
public class CloudAzurePlugin extends Plugin {

    private final Settings settings;
    protected final ESLogger logger = Loggers.getLogger(CloudAzurePlugin.class);

    public CloudAzurePlugin(Settings settings) {
        this.settings = settings;
        logger.trace("starting azure plugin...");
    }

    @Override
    public String name() {
        return "cloud-azure";
    }

    @Override
    public String description() {
        return "Cloud Azure Plugin";
    }

    @Override
    public Collection nodeModules() {
        List modules = new ArrayList<>();
        if (AzureModule.isCloudReady(settings)) {
            modules.add(new AzureModule(settings));
        }
        return modules;
    }

    public void onModule(RepositoriesModule module) {
        if (isSnapshotReady(settings, logger)) {
            module.registerRepository(AzureRepository.TYPE, AzureRepository.class, BlobStoreIndexShardRepository.class);
        }
    }

    public void onModule(DiscoveryModule discoveryModule) {
        if (AzureModule.isDiscoveryReady(settings, logger)) {
            discoveryModule.addDiscoveryType("azure", AzureDiscovery.class);
            discoveryModule.addUnicastHostProvider(AzureUnicastHostsProvider.class);
        }
    }

    public void onModule(IndexStoreModule storeModule) {
        storeModule.addIndexStore("smb_mmap_fs", SmbMmapFsIndexStore.class);
        storeModule.addIndexStore("smb_simple_fs", SmbSimpleFsIndexStore.class);
    }
}