64 lines
2.0 KiB
C#
64 lines
2.0 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Threading.Tasks;
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using Neo4j.Driver;
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public class ParallelEdgeImport {
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public static async Task Main(string[] args) {
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var nodeCount = 100;
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using (var driver = GraphDatabase.Driver(
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"bolt://localhost:7687", AuthTokens.None,
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(builder) => builder.WithEncryptionLevel(EncryptionLevel.None)
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.WithMaxTransactionRetryTime(TimeSpan.FromSeconds(15)))) {
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ClearDatabase(driver);
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// Create root
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using (var session = driver.Session()) {
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session.ExecuteWrite(tx => {
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var result = tx.Run("MERGE (root:Root) RETURN ID(root);");
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return result.Single()[0].As<int>();
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});
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}
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Trace.Assert(CountNodes(driver) == 1, "Node count after root creation is not correct!.");
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// Importing edges asynchronously
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var tasks = new List<Task>();
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for (int i = 0; i < nodeCount - 1; i++) {
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tasks.Add(ImportEdgeAsync(driver));
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}
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await Task.WhenAll(tasks);
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Trace.Assert(CountNodes(driver) == nodeCount);
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}
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Console.WriteLine("All ok!");
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}
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private static void ClearDatabase(IDriver driver) {
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using (var session = driver.Session()) session.Run("MATCH (n) DETACH DELETE n").Consume();
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}
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private static async Task ImportEdgeAsync(IDriver driver) {
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using (var session = driver.AsyncSession()) {
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await session.WriteTransactionAsync(async tx => {
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var reader = await tx.RunAsync(
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"MATCH (root:Root) CREATE (n:Node) CREATE (n)-[:TROUBLING_EDGE]->(root) RETURN ID(root)");
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await reader.FetchAsync();
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Console.WriteLine("Transaction got through!");
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return reader.Current[0];
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});
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}
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}
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private static int CountNodes(IDriver driver) {
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using (var session = driver.Session()) {
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var result = session.Run("MATCH (n) RETURN COUNT(*) AS cnt");
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return Convert.ToInt32(result.First()["cnt"]);
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}
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}
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}
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