src/quickstart/csharp/Exceptions.cs

/*
 * 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.
 */

/*
 * The Exceptions QuickStart Example.
 *
 * This example takes the following steps:
 *
 * 1. Create CacheFactory using the user specified settings or from the gfcpp.properties file by default.
 * 2. Create a Geode Cache.
 * 3. Get the example generic Regions from the Cache.
 * 4. Perform some operations which should cause exceptions.
 * 5. Close the Cache.
 * 6. Put an Entry into the Region when Cache is already closed.
 *
 */

// Use standard namespaces
using System;

// Use the Geode namespace
using Apache.Geode.Client;

namespace Apache.Geode.Client.QuickStart
{
  // The Exceptions QuickStart example.
  class Exceptions
  {
    static void Main(string[] args)
    {
      try
      {
        // Create CacheFactory using the user specified settings or from the gfcpp.properties file by default.
        Properties<string, string> prp = Properties<string, string>.Create<string, string>();
        prp.Insert("cache-xml-file", "XMLs/clientExceptions.xml");

        CacheFactory cacheFactory = CacheFactory.CreateCacheFactory(prp);

        Console.WriteLine("Created CacheFactory");

        // Create a Geode Cache with the "clientExceptions.xml" Cache XML file.
        Cache cache = cacheFactory.SetSubscriptionEnabled(true).Create();

        Console.WriteLine("Created the Geode Cache");
        
        // Get the example Regions from the Cache which are declared in the Cache XML file.
        IRegion<object, string> region = cache.GetRegion<object, string>("exampleRegion");
        IRegion<object, string> region2 = cache.GetRegion<object, string>("exampleRegion2");

        Console.WriteLine("Obtained the generic Region from the Cache");

        // Put an Entry (Key and Value pair) into the Region using the IDictionary interface.
        region["Key1"] = "Value1";

        Console.WriteLine("Put the first Entry into the Region");

        // Put an Entry into the Region by manually creating a Key and a Value pair.
        int key = 123;
        string value = "123";
        region[key] = value;

        Console.WriteLine("Put the second Entry into the Region");

        // Get Entries back out of the Region.
        string result1 = region["Key1"];

        Console.WriteLine("Obtained the first Entry from the Region");

        string result2 = region[key];

        Console.WriteLine("Obtained the second Entry from the Region");

        //Destroy exampleRegion2.
        object userData = null;
        region2.DestroyRegion(userData);
        
        try
        {
          // Try to Put an Entry into a destroyed Region.
          region2["Key1"] = "Value1";
  
          Console.WriteLine("UNEXPECTED: Put should not have succeeded");
        }
        catch (RegionDestroyedException gfex)
        {
          Console.WriteLine("Expected RegionDestroyedException: {0}", gfex.Message);
        }
        
        try
        {
          //Its not valid to create two instance of Cache with different settings.
          //If the settings are the same it returns the existing Cache instance.
          CacheFactory cacheFactory2 = CacheFactory.CreateCacheFactory(prp);
          Cache cache1 = cacheFactory2.SetSubscriptionEnabled(true).AddServer("localhost", 40405).Create();

          Console.WriteLine("UNEXPECTED: Cache create should not have succeeded");
        }
        catch (IllegalStateException gfex)
        {
          Console.WriteLine("Expected IllegalStateException: {0}", gfex.Message);
        }
        
        // Close the Geode Cache.
        cache.Close();

        Console.WriteLine("Closed the Geode Cache");

        try
        {
          // Put an Entry into the Region when Cache is already closed.
          region["Key1"] = "Value1";
  
          Console.WriteLine("UNEXPECTED: Put should not have succeeded");
        }
        catch (RegionDestroyedException gfex)
        {
          Console.WriteLine("Expected RegionDestroyedException: {0}", gfex.Message);
        }
      }
      // An exception should not occur
      catch (GeodeException gfex)
      {
        Console.WriteLine("Exceptions Geode Exception: {0}", gfex.Message);
      }
    }
  }
}