| /* |
| * 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.Datagrid |
| { |
| using System; |
| using System.Threading; |
| using System.Threading.Tasks; |
| using Apache.Ignite.Core; |
| using Apache.Ignite.Core.Cache; |
| using Apache.Ignite.Core.Cache.Configuration; |
| using Apache.Ignite.Core.Transactions; |
| |
| /// <summary> |
| /// This example demonstrates optimistic transaction concurrency control. |
| /// <para /> |
| /// 1) Build the project Apache.Ignite.ExamplesDll (select it -> right-click -> Build). |
| /// Apache.Ignite.ExamplesDll.dll must appear in %IGNITE_HOME%/platforms/dotnet/examples/Apache.Ignite.ExamplesDll/bin/${Platform]/${Configuration} folder. |
| /// 2) Set this class as startup object (Apache.Ignite.Examples project -> right-click -> Properties -> |
| /// Application -> Startup object); |
| /// 3) Start example (F5 or Ctrl+F5). |
| /// <para /> |
| /// This example can be run with standalone Apache Ignite.NET node: |
| /// 1) Run %IGNITE_HOME%/platforms/dotnet/bin/Apache.Ignite.exe: |
| /// Apache.Ignite.exe -configFileName=platforms\dotnet\examples\apache.ignite.examples\app.config -assembly=[path_to_Apache.Ignite.ExamplesDll.dll] |
| /// 2) Start example. |
| /// </summary> |
| public class OptimisticTransactionExample |
| { |
| /// <summary>Cache name.</summary> |
| private const string CacheName = "dotnet_optimistic_tx_example"; |
| |
| [STAThread] |
| public static void Main() |
| { |
| using (var ignite = Ignition.StartFromApplicationConfiguration()) |
| { |
| Console.WriteLine(); |
| Console.WriteLine(">>> Optimistic transaction example started."); |
| |
| // Create Transactional cache. |
| var cacheCfg = new CacheConfiguration(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 task1 = Task.Factory.StartNew(() => IncrementCacheValue(cache, 1)); |
| var task2 = Task.Factory.StartNew(() => IncrementCacheValue(cache, 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> |
| /// <param name="cache">The cache.</param> |
| /// <param name="threadId">The thread identifier.</param> |
| private static void IncrementCacheValue(ICache<int, int> cache, int threadId) |
| { |
| try |
| { |
| var transactions = cache.Ignite.GetTransactions(); |
| |
| 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 (TransactionOptimisticException ex) |
| { |
| Console.WriteLine("\n>>> Thread {0} failed to increment cached value. " + |
| "Caught an expected optimistic exception: {1}", threadId, ex.Message); |
| } |
| } |
| } |
| } |