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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;
import java.util.concurrent.CompletionStage;
import org.neo4j.driver.async.AsyncSession;
import org.neo4j.driver.exceptions.ClientException;
import org.neo4j.driver.reactive.RxSession;
import org.neo4j.driver.types.TypeSystem;
import org.neo4j.driver.util.Experimental;
/**
* Accessor for a specific Neo4j graph database.
*
* Driver implementations are typically thread-safe, act as a template
* for session creation and host a connection pool. All configuration
* and authentication settings are held immutably by the Driver. Should
* different settings be required, a new Driver instance should be created.
*
* A driver maintains a connection pool for each remote Neo4j server. Therefore
* the most efficient way to make use of a Driver is to use the same instance
* across the application.
*
* To construct a new Driver, use one of the
* {@link GraphDatabase#driver(String, AuthToken) GraphDatabase.driver} methods.
* The URI passed to
* this method determines the type of Driver created.
*
*
* Available schemes and drivers
*
* URI Scheme Driver
* boltDirect driver: connects directly to the host and port specified in the URI.
*
*
* neo4jRouting driver: can automatically discover members of a Causal Cluster and route {@link Session sessions} based on {@link AccessMode}.
*
*
*
*
* @since 1.0 (Modified and Added {@link AsyncSession} and {@link RxSession} since 2.0)
*/
public interface Driver extends AutoCloseable {
/**
* Return a flag to indicate whether or not encryption is used for this driver.
*
* @return true if the driver requires encryption, false otherwise
*/
boolean isEncrypted();
/**
* Create a new general purpose {@link Session} with default {@link SessionConfig session configuration}.
*
* Alias to {@link #session(SessionConfig)}}.
*
* @return a new {@link Session} object.
*/
Session session();
/**
* Create a new {@link Session} with a specified {@link SessionConfig session configuration}.
* Use {@link SessionConfig#forDatabase(String)} to obtain a general purpose session configuration for the specified database.
* @param sessionConfig specifies session configurations for this session.
* @return a new {@link Session} object.
* @see SessionConfig
*/
Session session(SessionConfig sessionConfig);
/**
* Create a new general purpose {@link RxSession} with default {@link SessionConfig session configuration}.
* The {@link RxSession} provides a reactive way to run queries and process results.
*
* Alias to {@link #rxSession(SessionConfig)}}.
*
* @return a new {@link RxSession} object.
*/
RxSession rxSession();
/**
* Create a new {@link RxSession} with a specified {@link SessionConfig session configuration}.
* Use {@link SessionConfig#forDatabase(String)} to obtain a general purpose session configuration for the specified database.
* The {@link RxSession} provides a reactive way to run queries and process results.
* @param sessionConfig used to customize the session.
* @return a new {@link RxSession} object.
*/
RxSession rxSession(SessionConfig sessionConfig);
/**
* Create a new general purpose {@link AsyncSession} with default {@link SessionConfig session configuration}.
* The {@link AsyncSession} provides an asynchronous way to run queries and process results.
*
* Alias to {@link #asyncSession(SessionConfig)}}.
*
* @return a new {@link AsyncSession} object.
*/
AsyncSession asyncSession();
/**
* Create a new {@link AsyncSession} with a specified {@link SessionConfig session configuration}.
* Use {@link SessionConfig#forDatabase(String)} to obtain a general purpose session configuration for the specified database.
* The {@link AsyncSession} provides an asynchronous way to run queries and process results.
*
* @param sessionConfig used to customize the session.
* @return a new {@link AsyncSession} object.
*/
AsyncSession asyncSession(SessionConfig sessionConfig);
/**
* Close all the resources assigned to this driver, including open connections and IO threads.
*
* This operation works the same way as {@link #closeAsync()} but blocks until all resources are closed.
*
* Please note that this method is intended for graceful shutdown only and expects that all driver interactions have
* either been finished or no longer awaited for. Pending driver API calls may not be completed after this method is
* invoked.
*/
@Override
void close();
/**
* Close all the resources assigned to this driver, including open connections and IO threads.
*
* This operation is asynchronous and returns a {@link CompletionStage}. This stage is completed with
* {@code null} when all resources are closed. It is completed exceptionally if termination fails.
*
* Please note that this method is intended for graceful shutdown only and expects that all driver interactions have
* either been finished or no longer awaited for. Pending driver API calls may not be completed after this method is
* invoked.
*
* @return a {@link CompletionStage completion stage} that represents the asynchronous close.
*/
CompletionStage closeAsync();
/**
* Returns the driver metrics if metrics reporting is enabled via {@link Config.ConfigBuilder#withDriverMetrics()}.
* Otherwise, a {@link ClientException} will be thrown.
* @return the driver metrics if enabled.
* @throws ClientException if the driver metrics reporting is not enabled.
*/
Metrics metrics();
/**
* Returns true if the driver metrics reporting is enabled via {@link Config.ConfigBuilder#withDriverMetrics()}, otherwise false.
*
* @return true if the metrics reporting is enabled.
*/
boolean isMetricsEnabled();
/**
* This will return the type system supported by the driver.
* The types supported on a particular server a session is connected against might not contain all of the types defined here.
*
* @return type system used by this query runner for classifying values
*/
@Experimental
TypeSystem defaultTypeSystem();
/**
* This verifies if the driver can connect to a remote server or a cluster
* by establishing a network connection with the remote and possibly exchanging a few data before closing the connection.
*
* It throws exception if fails to connect. Use the exception to further understand the cause of the connectivity problem.
* Note: Even if this method throws an exception, the driver still need to be closed via {@link #close()} to free up all resources.
*/
void verifyConnectivity();
/**
* This verifies if the driver can connect to a remote server or cluster
* by establishing a network connection with the remote and possibly exchanging a few data before closing the connection.
*
* This operation is asynchronous and returns a {@link CompletionStage}. This stage is completed with
* {@code null} when the driver connects to the remote server or cluster successfully.
* It is completed exceptionally if the driver failed to connect the remote server or cluster.
* This exception can be used to further understand the cause of the connectivity problem.
* Note: Even if this method complete exceptionally, the driver still need to be closed via {@link #closeAsync()} to free up all resources.
*
* @return a {@link CompletionStage completion stage} that represents the asynchronous verification.
*/
CompletionStage verifyConnectivityAsync();
/**
* Returns true if the server or cluster the driver connects to supports multi-databases, otherwise false.
* @return true if the server or cluster the driver connects to supports multi-databases, otherwise false.
*/
boolean supportsMultiDb();
/**
* Asynchronous check if the server or cluster the driver connects to supports multi-databases.
* @return a {@link CompletionStage completion stage} that returns true if the server or cluster
* the driver connects to supports multi-databases, otherwise false.
*/
CompletionStage supportsMultiDbAsync();
}