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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.messaging;

import io.netty.channel.Channel;
import io.netty.channel.ChannelPromise;

import java.util.concurrent.CompletionStage;

import org.neo4j.driver.AuthToken;
import org.neo4j.driver.Bookmark;
import org.neo4j.driver.Query;
import org.neo4j.driver.Session;
import org.neo4j.driver.Transaction;
import org.neo4j.driver.TransactionConfig;
import org.neo4j.driver.exceptions.ClientException;
import org.neo4j.driver.internal.BookmarkHolder;
import org.neo4j.driver.internal.InternalBookmark;
import org.neo4j.driver.internal.async.UnmanagedTransaction;
import org.neo4j.driver.internal.cluster.RoutingContext;
import org.neo4j.driver.internal.cursor.ResultCursorFactory;
import org.neo4j.driver.internal.messaging.v3.BoltProtocolV3;
import org.neo4j.driver.internal.messaging.v4.BoltProtocolV4;
import org.neo4j.driver.internal.messaging.v41.BoltProtocolV41;
import org.neo4j.driver.internal.messaging.v42.BoltProtocolV42;
import org.neo4j.driver.internal.messaging.v43.BoltProtocolV43;
import org.neo4j.driver.internal.messaging.v44.BoltProtocolV44;
import org.neo4j.driver.internal.spi.Connection;

import static org.neo4j.driver.internal.async.connection.ChannelAttributes.protocolVersion;

public interface BoltProtocol
{
    /**
     * Instantiate {@link MessageFormat} used by this Bolt protocol verison.
     *
     * @return new message format.
     */
    MessageFormat createMessageFormat();

    /**
     * Initialize channel after it is connected and handshake selected this protocol version.
     *
     * @param userAgent the user agent string.
     * @param authToken the authentication token.
     * @param routingContext the configured routing context
     * @param channelInitializedPromise the promise to be notified when initialization is completed.
     */
    void initializeChannel( String userAgent, AuthToken authToken, RoutingContext routingContext, ChannelPromise channelInitializedPromise );

    /**
     * Prepare to close channel before it is closed.
     * @param channel the channel to close.
     */
    void prepareToCloseChannel( Channel channel );

    /**
     * Begin an unmanaged transaction.
     *
     * @param connection the connection to use.
     * @param bookmark the bookmarks. Never null, should be {@link InternalBookmark#empty()} when absent.
     * @param config the transaction configuration. Never null, should be {@link TransactionConfig#empty()} when absent.
     * @return a completion stage completed when transaction is started or completed exceptionally when there was a failure.
     */
    CompletionStage beginTransaction( Connection connection, Bookmark bookmark, TransactionConfig config );

    /**
     * Commit the unmanaged transaction.
     *
     * @param connection the connection to use.
     * @return a completion stage completed with a bookmark when transaction is committed or completed exceptionally when there was a failure.
     */
    CompletionStage commitTransaction( Connection connection );

    /**
     * Rollback the unmanaged transaction.
     *
     * @param connection the connection to use.
     * @return a completion stage completed when transaction is rolled back or completed exceptionally when there was a failure.
     */
    CompletionStage rollbackTransaction( Connection connection );

    /**
     * Execute the given query in an auto-commit transaction, i.e. {@link Session#run(Query)}.
     *
     * @param connection     the network connection to use.
     * @param query          the cypher to execute.
     * @param bookmarkHolder the bookmarksHolder that keeps track of the current bookmark and can be updated with a new bookmark.
     * @param config         the transaction config for the implicitly started auto-commit transaction.
     * @param fetchSize      the record fetch size for PULL message.
     * @return stage with cursor.
     */
    ResultCursorFactory runInAutoCommitTransaction( Connection connection, Query query, BookmarkHolder bookmarkHolder, TransactionConfig config,
                                                    long fetchSize );

    /**
     * Execute the given query in a running unmanaged transaction, i.e. {@link Transaction#run(Query)}.
     *
     * @param connection the network connection to use.
     * @param query      the cypher to execute.
     * @param tx         the transaction which executes the query.
     * @param fetchSize  the record fetch size for PULL message.
     * @return stage with cursor.
     */
    ResultCursorFactory runInUnmanagedTransaction( Connection connection, Query query, UnmanagedTransaction tx, long fetchSize );

    /**
     * Returns the protocol version. It can be used for version specific error messages.
     * @return the protocol version.
     */
    BoltProtocolVersion version();

    /**
     * Obtain an instance of the protocol for the given channel.
     *
     * @param channel the channel to get protocol for.
     * @return the protocol.
     * @throws ClientException when unable to find protocol version for the given channel.
     */
    static BoltProtocol forChannel( Channel channel )
    {
        return forVersion( protocolVersion( channel ) );
    }

    /**
     * Obtain an instance of the protocol for the given channel.
     *
     * @param version the version of the protocol.
     * @return the protocol.
     * @throws ClientException when unable to find protocol with the given version.
     */
    static BoltProtocol forVersion( BoltProtocolVersion version )
    {
        if ( BoltProtocolV3.VERSION.equals( version ) )
        {
            return BoltProtocolV3.INSTANCE;
        }
        else if ( BoltProtocolV4.VERSION.equals( version ) )
        {
            return BoltProtocolV4.INSTANCE;
        }
        else if ( BoltProtocolV41.VERSION.equals( version ) )
        {
            return BoltProtocolV41.INSTANCE;
        }
        else if ( BoltProtocolV42.VERSION.equals( version ) )
        {
            return BoltProtocolV42.INSTANCE;
        }
        else if ( BoltProtocolV43.VERSION.equals( version ) )
        {
            return BoltProtocolV43.INSTANCE;
        }
        else if ( BoltProtocolV44.VERSION.equals( version ) )
        {
            return BoltProtocolV44.INSTANCE;
        }
        throw new ClientException( "Unknown protocol version: " + version );
    }
}