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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.flink.runtime.rpc.akka;

import akka.actor.AbstractExtensionId;
import akka.actor.Address;
import akka.actor.ExtendedActorSystem;
import akka.actor.Extension;

/**
 * {@link akka.actor.ActorSystem} {@link Extension} used to obtain the {@link Address} on which the
 * given ActorSystem is listening.
 */
public class RemoteAddressExtension
        extends AbstractExtensionId {

    public static final RemoteAddressExtension INSTANCE = new RemoteAddressExtension();

    private RemoteAddressExtension() {}

    @Override
    public RemoteAddressExtensionImpl createExtension(ExtendedActorSystem system) {
        return new RemoteAddressExtensionImpl(system);
    }

    /** Actual {@link Extension} implementation. */
    public static class RemoteAddressExtensionImpl implements Extension {

        private final Address address;

        public RemoteAddressExtensionImpl(ExtendedActorSystem system) {
            address = system.provider().getDefaultAddress();
        }

        public Address getAddress() {
            return address;
        }
    }
}