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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * Licensed 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 com.mongodb.internal.connection;

import com.mongodb.MongoException;
import com.mongodb.ServerAddress;
import com.mongodb.connection.ClusterId;
import com.mongodb.connection.ClusterSettings;
import com.mongodb.connection.ClusterType;
import java.util.Collection;
import java.util.Collections;
import static com.mongodb.assertions.Assertions.notNull;

// @deprecated Usage of this API is not supported in AEM as a Cloud Service.
@Deprecated(since = "2021-05-27")
public final class DnsMultiServerCluster extends AbstractMultiServerCluster {

    private final DnsSrvRecordMonitor dnsSrvRecordMonitor;

    private volatile MongoException srvResolutionException;

    public DnsMultiServerCluster(final ClusterId clusterId, final ClusterSettings settings, final ClusterableServerFactory serverFactory, final DnsSrvRecordMonitorFactory dnsSrvRecordMonitorFactory) {
        super(clusterId, settings, serverFactory);
        notNull("srvHost", settings.getSrvHost());
        dnsSrvRecordMonitor = dnsSrvRecordMonitorFactory.create(settings.getSrvHost(), new DnsSrvRecordInitializer() {

            private volatile boolean initialized;

            @Override
            public void initialize(final Collection hosts) {
                srvResolutionException = null;
                if (!initialized) {
                    initialized = true;
                    DnsMultiServerCluster.this.initialize(hosts);
                } else {
                    DnsMultiServerCluster.this.onChange(hosts);
                }
            }

            @Override
            public void initialize(final MongoException initializationException) {
                if (!initialized) {
                    srvResolutionException = initializationException;
                    DnsMultiServerCluster.this.initialize(Collections.emptyList());
                }
            }

            @Override
            public ClusterType getClusterType() {
                return DnsMultiServerCluster.this.getClusterType();
            }
        });
        dnsSrvRecordMonitor.start();
    }

    @Override
    protected MongoException getSrvResolutionException() {
        return srvResolutionException;
    }

    @Override
    public void close() {
        if (dnsSrvRecordMonitor != null) {
            dnsSrvRecordMonitor.close();
        }
        super.close();
    }
}