org.neo4j.driver.internal.cluster.RouteMessageRoutingProcedureRunner Maven / Gradle / Ivy

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Access to the Neo4j graph database through Java
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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.cluster;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.function.Supplier;
import java.util.stream.Collectors;

import org.neo4j.driver.AccessMode;
import org.neo4j.driver.Bookmark;
import org.neo4j.driver.Query;
import org.neo4j.driver.Record;
import org.neo4j.driver.Value;
import org.neo4j.driver.Values;
import org.neo4j.driver.internal.DatabaseName;
import org.neo4j.driver.internal.InternalRecord;
import org.neo4j.driver.internal.async.connection.DirectConnection;
import org.neo4j.driver.internal.handlers.RouteMessageResponseHandler;
import org.neo4j.driver.internal.messaging.request.RouteMessage;
import org.neo4j.driver.internal.spi.Connection;

import static java.util.Collections.singletonList;

/**
 * This implementation of the {@link RoutingProcedureRunner} access the routing procedure
 * through the bolt's ROUTE message.
 */
public class RouteMessageRoutingProcedureRunner implements RoutingProcedureRunner
{
    private final Map routingContext;
    private final Supplier>> createCompletableFuture;

    public RouteMessageRoutingProcedureRunner( RoutingContext routingContext )
    {
        this( routingContext, CompletableFuture::new );
    }

    protected RouteMessageRoutingProcedureRunner( RoutingContext routingContext, Supplier>> createCompletableFuture )
    {
        this.routingContext = routingContext
                .toMap()
                .entrySet()
                .stream()
                .collect( Collectors.toMap( Map.Entry::getKey, entry -> Values.value( entry.getValue() ) ) );
        this.createCompletableFuture = createCompletableFuture;
    }

    @Override
    public CompletionStage run( Connection connection, DatabaseName databaseName, Bookmark bookmark, String impersonatedUser )
    {
        CompletableFuture> completableFuture = createCompletableFuture.get();

        DirectConnection directConnection = toDirectConnection( connection, databaseName, impersonatedUser );
        directConnection.writeAndFlush( new RouteMessage( routingContext, bookmark, databaseName.databaseName().orElse( null ), impersonatedUser ),
                                        new RouteMessageResponseHandler( completableFuture ) );
        return completableFuture
                .thenApply( routingTable -> new RoutingProcedureResponse( getQuery( databaseName ), singletonList( toRecord( routingTable ) ) ) )
                .exceptionally( throwable -> new RoutingProcedureResponse( getQuery( databaseName ), throwable.getCause() ) )
                .thenCompose( routingProcedureResponse -> directConnection.release().thenApply( ignore -> routingProcedureResponse ) );
    }

    private Record toRecord( Map routingTable )
    {
        return new InternalRecord( new ArrayList<>( routingTable.keySet() ), routingTable.values().toArray( new Value[0] ) );
    }

    private DirectConnection toDirectConnection( Connection connection, DatabaseName databaseName, String impersonatedUser )
    {
        return new DirectConnection( connection, databaseName, AccessMode.READ, impersonatedUser );
    }

    private Query getQuery( DatabaseName databaseName )
    {
        Map params = new HashMap<>();
        params.put( "routingContext", routingContext );
        params.put( "databaseName", databaseName.databaseName().orElse( null ) );
        return new Query( "ROUTE $routingContext $databaseName", params );
    }
}