org.neo4j.driver.internal.ResolvedBoltServerAddress Maven / Gradle / Ivy

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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 org.neo4j.driver.internal;

import java.net.InetAddress;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Stream;

import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.joining;

/**
 * An explicitly resolved version of {@link BoltServerAddress} that always contains one or more resolved IP addresses.
 */
public class ResolvedBoltServerAddress extends BoltServerAddress
{
    private static final String HOST_ADDRESSES_FORMAT = "%s%s:%d";
    private static final int MAX_HOST_ADDRESSES_IN_STRING_VALUE = 5;
    private static final String HOST_ADDRESS_DELIMITER = ",";
    private static final String HOST_ADDRESSES_PREFIX = "(";
    private static final String HOST_ADDRESSES_SUFFIX = ")";
    private static final String TRIMMED_HOST_ADDRESSES_SUFFIX = ",..." + HOST_ADDRESSES_SUFFIX;

    private final Set resolvedAddresses;
    private final String stringValue;

    public ResolvedBoltServerAddress( String host, int port, InetAddress[] resolvedAddressesArr )
    {
        super( host, port );
        requireNonNull( resolvedAddressesArr, "resolvedAddressesArr" );
        if ( resolvedAddressesArr.length == 0 )
        {
            throw new IllegalArgumentException(
                    "The resolvedAddressesArr must not be empty, check your DomainNameResolver is compliant with the interface contract" );
        }
        resolvedAddresses = Collections.unmodifiableSet( new LinkedHashSet<>( Arrays.asList( resolvedAddressesArr ) ) );
        stringValue = createStringRepresentation();
    }

    /**
     * Create a stream of unicast addresses.
     * 
     * The stream is created from the list of resolved IP addresses. Each unicast address is given a unique IP address as the connectionHost value.
     *
     * @return stream of unicast addresses.
     */
    @Override
    public Stream unicastStream()
    {
        return resolvedAddresses.stream().map( address -> new BoltServerAddress( host, address.getHostAddress(), port ) );
    }

    @Override
    public boolean equals( Object o )
    {
        if ( this == o )
        {
            return true;
        }
        if ( o == null || getClass() != o.getClass() )
        {
            return false;
        }
        if ( !super.equals( o ) )
        {
            return false;
        }
        ResolvedBoltServerAddress that = (ResolvedBoltServerAddress) o;
        return resolvedAddresses.equals( that.resolvedAddresses );
    }

    @Override
    public int hashCode()
    {
        return Objects.hash( super.hashCode(), resolvedAddresses );
    }

    @Override
    public String toString()
    {
        return stringValue;
    }

    private String createStringRepresentation()
    {
        String hostAddresses = resolvedAddresses.stream()
                                                .limit( MAX_HOST_ADDRESSES_IN_STRING_VALUE )
                                                .map( InetAddress::getHostAddress )
                                                .collect( joining( HOST_ADDRESS_DELIMITER, HOST_ADDRESSES_PREFIX,
                                                                   resolvedAddresses.size() > MAX_HOST_ADDRESSES_IN_STRING_VALUE
                                                                   ? TRIMMED_HOST_ADDRESSES_SUFFIX
                                                                   : HOST_ADDRESSES_SUFFIX ) );
        return String.format( HOST_ADDRESSES_FORMAT, host, hostAddresses, port );
    }
}