| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| namespace Apache.Ignite.Examples.Thin.Cache.OptimisticTransactionThin |
| { |
| using System; |
| using System.Threading; |
| using System.Threading.Tasks; |
| using Apache.Ignite.Core; |
| using Apache.Ignite.Core.Cache.Configuration; |
| using Apache.Ignite.Core.Client; |
| using Apache.Ignite.Core.Client.Cache; |
| using Apache.Ignite.Core.Client.Transactions; |
| using Apache.Ignite.Core.Transactions; |
| using Apache.Ignite.Examples.Shared; |
| |
| /// <summary> |
| /// This example demonstrates optimistic transaction concurrency control. |
| /// <para /> |
| /// This example requires an Ignite server node. You can start the node in any of the following ways: |
| /// * docker run -p 10800:10800 apacheignite/ignite |
| /// * dotnet run -p ServerNode.csproj |
| /// * ignite.sh/ignite.bat from the distribution |
| /// </summary> |
| public static class Program |
| { |
| private const string CacheName = "dotnet_optimistic_tx_example"; |
| |
| public static void Main() |
| { |
| using (IIgniteClient ignite = Ignition.StartClient(Utils.GetThinClientConfiguration())) |
| { |
| Console.WriteLine(); |
| Console.WriteLine(">>> Optimistic transaction example started."); |
| |
| // Create Transactional cache. |
| var cacheCfg = new CacheClientConfiguration(CacheName) |
| { |
| AtomicityMode = CacheAtomicityMode.Transactional |
| }; |
| |
| var cache = ignite.GetOrCreateCache<int, int>(cacheCfg); |
| |
| // Put a value. |
| cache[1] = 0; |
| |
| // Increment a value in parallel within a transaction. |
| var transactions = ignite.GetTransactions(); |
| var task1 = Task.Factory.StartNew(() => IncrementCacheValue(cache, transactions, 1)); |
| var task2 = Task.Factory.StartNew(() => IncrementCacheValue(cache, transactions, 2)); |
| |
| Task.WaitAll(task1, task2); |
| |
| Console.WriteLine(); |
| Console.WriteLine(">>> Resulting value in cache: " + cache[1]); |
| |
| Console.WriteLine(); |
| Console.WriteLine(">>> Example finished, press any key to exit ..."); |
| Console.ReadKey(); |
| } |
| } |
| |
| /// <summary> |
| /// Increments the cache value within a transaction. |
| /// </summary> |
| private static void IncrementCacheValue( |
| ICacheClient<int, int> cache, |
| ITransactionsClient transactions, |
| int threadId) |
| { |
| try |
| { |
| using (var tx = transactions.TxStart(TransactionConcurrency.Optimistic, |
| TransactionIsolation.Serializable)) |
| { |
| // Increment cache value. |
| cache[1]++; |
| |
| // Introduce a delay to ensure lock conflict. |
| Thread.Sleep(TimeSpan.FromSeconds(2.5)); |
| |
| tx.Commit(); |
| } |
| |
| Console.WriteLine("\n>>> Thread {0} successfully incremented cached value.", threadId); |
| } |
| catch (IgniteClientException ex) |
| { |
| Console.WriteLine("\n>>> Thread {0} failed to increment cached value. " + |
| "Caught an expected optimistic exception: {1}", threadId, ex.Message); |
| } |
| } |
| } |
| } |