modules/network/src/main/java/org/apache/ignite/network/StaticNodeFinder.java

/*
 * 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.ignite.network;

import java.util.Arrays;
import java.util.List;
import org.apache.ignite.configuration.schemas.network.NetworkView;

import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toUnmodifiableList;

/**
 * {@code NodeFinder} implementation that encapsulates a predefined list of network addresses.
 */
public class StaticNodeFinder implements NodeFinder {
    /** List of seed cluster members. */
    private final List<NetworkAddress> addresses;

    /**
     * Constructor.
     *
     * @param addresses Addresses of initial cluster members.
     */
    public StaticNodeFinder(List<NetworkAddress> addresses) {
        this.addresses = addresses;
    }

    /**
     * Creates a node finder extracting the initial cluster member addresses from the given configuration.
     *
     * @param networkConfiguration Network configuration.
     * @return Node Finder that returns addresses from the given configuration.
     */
    public static StaticNodeFinder fromConfiguration(NetworkView networkConfiguration) {
        return Arrays.stream(networkConfiguration.netClusterNodes())
            .map(NetworkAddress::from)
            .collect(collectingAndThen(toUnmodifiableList(), StaticNodeFinder::new));
    }

    /** {@inheritDoc} */
    @Override public List<NetworkAddress> findNodes() {
        return addresses;
    }
}