ObjectCache Class

using Leadtools.Caching; 
 
 
public void FileCacheConfigurationExample() 
{ 
   // XML file to save the cache configuration 
   string cacheConfigFile = Path.Combine(LEAD_VARS.ImagesDir, "filecache.xml"); 
 
   string cacheDir = Path.Combine(LEAD_VARS.ImagesDir, "cache"); 
   // This is optional and can be null if not needed 
   string cacheVirtualDir = "http://localhost/cache"; 
 
   // Create the LEADTOOLS FileCache object and set it up 
 
   var cache1 = new FileCache(); 
   cache1.CacheDirectory = cacheDir; 
   if (cacheVirtualDir != null) 
      cache1.CacheVirtualDirectory = new Uri(cacheVirtualDir); 
   cache1.PolicySerializationMode = CacheSerializationMode.Json; 
   cache1.DataSerializationMode = CacheSerializationMode.Json; 
   cache1.DefaultRegion = "defaultRegion"; 
   cache1.AccessTimeout = TimeSpan.FromSeconds(5); 
 
   Console.WriteLine("cache1 ready"); 
 
   // Set the policy, expires in 1 day 
 
   var defaultPolicy = new CacheItemPolicy(); 
   var absoluteExpiration = DateTime.Now; 
   absoluteExpiration = absoluteExpiration.AddDays(1); 
   defaultPolicy.AbsoluteExpiration = absoluteExpiration; 
   cache1.DefaultPolicy = defaultPolicy; 
 
   // Cache is ready, save its configuration to the file 
   using (var stream = File.Create(cacheConfigFile)) 
      cache1.SaveConfiguration(stream, true); 
 
   // Add an item 
   CacheItem<string> cacheItem = new CacheItem<string>("key1", "value1", "region1"); 
   Console.WriteLine("Adding {0}.{1} with value:{2} to cache1", cacheItem.RegionName, cacheItem.Key, cacheItem.Value); 
   cache1.Add(cacheItem, new CacheItemPolicy()); 
   // Check it 
   CacheItem<string> result = cache1.GetCacheItem<string>("key1", "region1"); 
   Assert.AreEqual(cacheItem.Value, result.Value); 
 
   // Now, call a separate function with just the configuration file to load and setup the cache and read the item back 
   InitFromConfigurationAndCheckCache(cacheConfigFile, cacheItem); 
} 
 
private static void InitFromConfigurationAndCheckCache(string cacheConfigFile, CacheItem<string> originalItem) 
{ 
   // Create the cache from the configuration file 
   // Note that we can use the base ObjectCache object here, we do not need to know the exact type 
   ObjectCache cache2 = null; 
 
   using (var stream = File.OpenRead(cacheConfigFile)) 
      cache2 = ObjectCache.CreateFromConfigurations(stream, null); 
 
   Console.WriteLine("cache2 loaded from {0}", cacheConfigFile); 
 
   // Read the item we previously saved and check its value 
   CacheItem<string> result = cache2.GetCacheItem<string>(originalItem.Key, originalItem.RegionName); 
   Console.WriteLine("Reading {0}.{1} with value:{2} to cache1", result.RegionName, result.Key, result.Value); 
   Assert.AreEqual(originalItem.Value, result.Value); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}