org.elasticsearch.transport.ConnectionManager Maven / Gradle / Ivy

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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
 * under the License.
 */

package org.elasticsearch.transport;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.cluster.node.DiscoveryNode;

import java.io.Closeable;
import java.util.concurrent.CopyOnWriteArrayList;

public interface ConnectionManager extends Closeable {

    void addListener(TransportConnectionListener listener);

    void removeListener(TransportConnectionListener listener);

    void openConnection(DiscoveryNode node, ConnectionProfile connectionProfile, ActionListener listener);

    void connectToNode(DiscoveryNode node, ConnectionProfile connectionProfile,
                       ConnectionValidator connectionValidator,
                       ActionListener listener) throws ConnectTransportException;

    Transport.Connection getConnection(DiscoveryNode node);

    boolean nodeConnected(DiscoveryNode node);

    void disconnectFromNode(DiscoveryNode node);

    int size();

    @Override
    void close();

    void closeNoBlock();

    ConnectionProfile getConnectionProfile();

    @FunctionalInterface
    interface ConnectionValidator {
        void validate(Transport.Connection connection, ConnectionProfile profile, ActionListener listener);
    }

    final class DelegatingNodeConnectionListener implements TransportConnectionListener {

        private final CopyOnWriteArrayList listeners = new CopyOnWriteArrayList<>();

        @Override
        public void onNodeDisconnected(DiscoveryNode key, Transport.Connection connection) {
            for (TransportConnectionListener listener : listeners) {
                listener.onNodeDisconnected(key, connection);
            }
        }

        @Override
        public void onNodeConnected(DiscoveryNode node, Transport.Connection connection) {
            for (TransportConnectionListener listener : listeners) {
                listener.onNodeConnected(node, connection);
            }
        }

        @Override
        public void onConnectionOpened(Transport.Connection connection) {
            for (TransportConnectionListener listener : listeners) {
                listener.onConnectionOpened(connection);
            }
        }

        @Override
        public void onConnectionClosed(Transport.Connection connection) {
            for (TransportConnectionListener listener : listeners) {
                listener.onConnectionClosed(connection);
            }
        }

        public void addListener(TransportConnectionListener listener) {
            listeners.addIfAbsent(listener);
        }

        public void removeListener(TransportConnectionListener listener) {
            listeners.remove(listener);
        }
    }
}