IGNITE-4118 .NET: Optimistic transaction example This closes #1200
Project: http://git-wip-us.apache.org/repos/asf/ignite/repo Commit: http://git-wip-us.apache.org/repos/asf/ignite/commit/df670c7d Tree: http://git-wip-us.apache.org/repos/asf/ignite/tree/df670c7d Diff: http://git-wip-us.apache.org/repos/asf/ignite/diff/df670c7d Branch: refs/heads/ignite-2693 Commit: df670c7d64046d282c053f296c47a4743c58c8b1 Parents: ead1519 Author: Pavel Tupitsyn <[email protected]> Authored: Mon Nov 7 12:40:00 2016 +0300 Committer: Pavel Tupitsyn <[email protected]> Committed: Mon Nov 7 12:40:00 2016 +0300 ---------------------------------------------------------------------- .../Apache.Ignite.Examples.csproj | 1 + .../Datagrid/OptimisticTransactionExample.cs | 110 +++++++++++++++++++ 2 files changed, 111 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/ignite/blob/df670c7d/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Apache.Ignite.Examples.csproj ---------------------------------------------------------------------- diff --git a/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Apache.Ignite.Examples.csproj b/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Apache.Ignite.Examples.csproj index 9b1d323..2ee91da 100644 --- a/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Apache.Ignite.Examples.csproj +++ b/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Apache.Ignite.Examples.csproj @@ -52,6 +52,7 @@ <Compile Include="Compute\TaskExample.cs" /> <Compile Include="Datagrid\ContinuousQueryExample.cs" /> <Compile Include="Datagrid\DataStreamerExample.cs" /> + <Compile Include="Datagrid\OptimisticTransactionExample.cs" /> <Compile Include="Datagrid\PutGetExample.cs" /> <Compile Include="Datagrid\LinqExample.cs" /> <Compile Include="Datagrid\BinaryModeExample.cs" /> http://git-wip-us.apache.org/repos/asf/ignite/blob/df670c7d/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Datagrid/OptimisticTransactionExample.cs ---------------------------------------------------------------------- diff --git a/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Datagrid/OptimisticTransactionExample.cs b/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Datagrid/OptimisticTransactionExample.cs new file mode 100644 index 0000000..2f9d164 --- /dev/null +++ b/modules/platforms/dotnet/examples/Apache.Ignite.Examples/Datagrid/OptimisticTransactionExample.cs @@ -0,0 +1,110 @@ +/* + * 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. + */ + +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; + +namespace Apache.Ignite.Examples.Datagrid +{ + /// <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); + } + } + } +} \ No newline at end of file
