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DocumentMemoryCacheStartOptions Class

Summary

Options to use with DocumentMemoryCache.

Syntax
C#
C++/CLI
Python
public class DocumentMemoryCacheStartOptions 
public: 
   ref class DocumentMemoryCacheStartOptions 
class DocumentMemoryCacheStartOptions: 
Remarks

DocumentMemoryCacheStartOptions is used as the parameter for DocumentMemoryCache.Start and contains the following members:

Member Description
MinimumLoadDuration Minimum amount of time the initial loading of a document takes to be considered for memory optimization
MaximumItems Maximum number of items to keep in the cache
SlidingExpiration Amount of time a cache entry can remain in the cache without being touched before being deleted
TimerInterval Interval the timer uses to check for and remove expired items

Refer to DocumentMemoryCache for more information.

Example
C#
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Document.Writer; 
 
using Leadtools.Document; 
using Leadtools.Caching; 
using Leadtools.Annotations.Engine; 
using Leadtools.Ocr; 
using Leadtools.Barcode; 
using Leadtools.Document.Converter; 
 
public void DocumentMemoryCacheExample() 
{ 
   // The cache we are using 
   FileCache cache = new FileCache(); 
   cache.PolicySerializationMode = CacheSerializationMode.Json; 
   cache.DataSerializationMode = CacheSerializationMode.Json; 
   cache.CacheDirectory = @"c:\cache-dir"; 
 
   // The document files we are using 
   string[] documentFiles = 
   { 
      // PDF files are very fast to load and will not use memory cache 
      @"C:\LEADTOOLS22\Resources\Images\leadtools.pdf", 
      // Large Excel files are complex and loading may take some time, they could use memory cache 
      @"C:\LEADTOOLS22\Resources\Images\complex.xlsx", 
   }; 
 
   // First process without memory cache and obtain some times 
   LoadAndProcessDocument(documentFiles, cache); 
 
   // Then process with memory cache 
 
   // Document memory cache options to use 
   var documentMemoryCacheStartOptions = new DocumentMemoryCacheStartOptions 
   { 
      // Use for documents that take more than 2 seconds to load initially 
      MinimumLoadDuration = TimeSpan.FromSeconds(2), 
      // No maximum limit on the number of cache items to keep in memory 
      MaximumItems = 0, 
      // Purse items from the cache if not touched for 60 seconds 
      SlidingExpiration = TimeSpan.FromSeconds(60), 
      // Check for expired items every 60 seconds 
      TimerInterval = TimeSpan.FromSeconds(60) 
   }; 
 
   // Use it 
   DocumentFactory.DocumentMemoryCache.Start(documentMemoryCacheStartOptions); 
 
   // Run again 
   // For the first document, times should be very close to the since this is a PDF document and is very fast (less than MinimumLoadDuration) 
   // For the second document, initial times should be the same, but loading all pages should be much faster 
   LoadAndProcessDocument(documentFiles, cache); 
 
   // Clean up 
   DocumentFactory.DocumentMemoryCache.Stop(); 
} 
 
private static void LoadAndProcessDocument(string[] documentFiles, ObjectCache cache) 
{ 
   Console.WriteLine($"Using memory cache is {DocumentFactory.DocumentMemoryCache.IsStarted}"); 
   string[] documentIds = new string[documentFiles.Length]; 
 
   var stopwatch = new Stopwatch(); 
   TimeSpan elapsed; 
 
   for (var i = 0; i < documentFiles.Length; i++) 
   { 
      string documentFile = documentFiles[i]; 
      int pageCount; 
 
      // First try without memory cache and obtain some times 
      stopwatch.Restart(); 
      using (LEADDocument document = DocumentFactory.LoadFromFile( 
         documentFile, 
         new LoadDocumentOptions 
         { 
            Cache = cache 
         })) 
      { 
         document.Images.MaximumImagePixelSize = 2048; 
         document.AutoSaveToCache = false; 
         document.AutoDeleteFromCache = false; 
         document.SaveToCache(); 
         documentIds[i] = document.DocumentId; 
         pageCount = document.Pages.Count; 
      } 
      elapsed = stopwatch.Elapsed; 
      Console.WriteLine($"Initial load from {Path.GetFileName(documentFile)} took ~{(int)elapsed.TotalSeconds} seconds"); 
      // Check if it's in the cache 
      Console.WriteLine($"Is using memory cache is {DocumentFactory.DocumentMemoryCache.HasDocument(documentIds[i], false)}"); 
 
      // Next call LoadFromCache and process a page in multiple threads 
      stopwatch.Restart(); 
      LoadAllPagesInThreads(documentIds[i], pageCount, cache); 
      elapsed = stopwatch.Elapsed; 
      Console.WriteLine($"Multi-threaded load of all pages took ~{(int)elapsed.TotalSeconds} seconds"); 
   } 
 
   // Clean up 
   DeleteDocumentsFromCache(documentIds, cache); 
} 
 
private static void LoadAllPagesInThreads(string documentId, int pageCount, ObjectCache cache) 
{ 
   System.Threading.Tasks.Parallel.For( 
      1, 
      pageCount + 1, 
      new System.Threading.Tasks.ParallelOptions { MaxDegreeOfParallelism = 4 }, 
      (int pageNumber) => 
      { 
         // Load the document from the cache 
         using (LEADDocument document = DocumentFactory.LoadFromCache( 
            new LoadFromCacheOptions 
            { 
               Cache = cache, 
               DocumentId = documentId 
            })) 
         { 
            // Simulates processing of the page 
            DocumentPage documentPage = document.Pages[pageNumber - 1]; 
            using (RasterImage image = documentPage.GetImage()) 
            { 
 
            } 
         } 
      }); 
} 
 
private static void DeleteDocumentsFromCache(string[] documentIds, ObjectCache cache) 
{ 
   foreach (string documentId in documentIds) 
   { 
      DocumentFactory.DeleteFromCache(new LoadFromCacheOptions 
      { 
         Cache = cache, 
         DocumentId = documentId, 
      }); 
   } 
} 
Requirements

Target Platforms

Help Version 22.0.2023.4.21
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Document Assembly

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.