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CacheInfo Interface

Summary

Information and properties of a document in the cache.

Syntax

TypeScript

interface lt.Document.CacheInfo()

Remarks

CacheInfo is returned by DocumentFactory.checkCacheInfo to quickly obtain information on a document in the cache without loading it. This includes whether the document is in the cache, its name and mime type, the number of pages, and if it was loaded by the user.

CacheInfo contains the following members:

Member	Description
isVirtual	Indicates whether the document is virtual.
isLoaded	Indicates whether the document was loaded at least once.
hasAnnotations	Indicates whether the document has any annotations.
name	Document name
mimeType	MIME type of the document
isMimeTypeAccepted	Status of checking the document MIME type.
pageCount	Number of pages in this document.

Example

CheckCacheInfo.ts

DocumentHelper.ts

CheckCacheInfo.js

DocumentHelper.js

CheckCacheInfo.html

import { DocumentHelper } from "../../utilities/DocumentHelper"; 
 
export class DocumentFactory_CheckCacheInfoExample { 
   public constructor() { 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
      DocumentHelper.initFactory(); 
   } 
 
   public run = (buttonID: string) => { 
      const exampleButton = document.getElementById(buttonID); 
      exampleButton.onclick = this.checkCache; 
   } 
 
   checkCache = () => { 
      // Load a new document 
      const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf"; 
      const loadDocumentOptions = new lt.Document.LoadDocumentOptions(); 
 
      lt.Document.DocumentFactory.loadFromUri(url, loadDocumentOptions) 
         .done((document: lt.Document.LEADDocument) => { 
            DocumentHelper.log("Document loaded with " + document.pages.count + " pages", document); 
            // Check its cache info 
            lt.Document.DocumentFactory.checkCacheInfo(document.documentId) 
               .done((cacheInfo) => { 
                  if (cacheInfo) { 
                     // Found, show it 
                     DocumentHelper.log("Document was found in the cache"); 
                     DocumentHelper.log("IsVirtual is " + cacheInfo.isVirtual); 
                     DocumentHelper.log("IsLoaded is " + cacheInfo.isLoaded); 
                     DocumentHelper.log("HasAnnotations is " + cacheInfo.hasAnnotations); 
                     DocumentHelper.log("Name is " + cacheInfo.name); 
                     DocumentHelper.log("MIMEType is " + cacheInfo.mimeType); 
                     DocumentHelper.log("MIMEType accepted " + cacheInfo.isMimeTypeAccepted); 
                     DocumentHelper.log("Number of Pages is " + cacheInfo.pageCount); 
                  } else { 
                     DocumentHelper.log("Document was not found in the cache"); 
                  } 
               }) 
               .fail(DocumentHelper.showServiceError); 
         }) 
         .fail(DocumentHelper.showServiceError); 
   } 
}

export class DocumentHelper { 
   static showServiceError = (jqXHR, statusText, errorThrown) => { 
      alert("Error returned from service. See the console for details."); 
      const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown); 
      console.error(serviceError); 
   } 
 
   static log = (message: string, data?: any) => { 
      const outputElement = document.getElementById("output"); 
      if (outputElement) { 
         const time = (new Date()).toLocaleTimeString(); 
         const textElement = document.createElement("p"); 
         textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message; 
         outputElement.insertBefore(textElement, outputElement.firstChild); 
      } 
 
      if (!data) 
         console.log(message); 
      else 
         console.log(message, data); 
   } 
 
   static initFactory = () => { 
      // To communicate with the DocumentsService, it must be running! 
      // Change these parameters to match the path to the service. 
      lt.Document.DocumentFactory.serviceHost = "http://localhost:40000"; 
      lt.Document.DocumentFactory.servicePath = ""; 
      lt.Document.DocumentFactory.serviceApiPath = "api"; 
   } 
}

import { DocumentHelper } from "../../utilities/DocumentHelper"; 
 
export class DocumentFactory_CheckCacheInfoExample { 
   constructor() { 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
      DocumentHelper.initFactory(); 
   } 
 
   run = (buttonID) => { 
      const exampleButton = document.getElementById(buttonID); 
      exampleButton.onclick = this.checkCache; 
   } 
 
   checkCache = () => { 
      // Load a new document 
      const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf"; 
      const loadDocumentOptions = new lt.Document.LoadDocumentOptions(); 
 
      lt.Document.DocumentFactory.loadFromUri(url, loadDocumentOptions) 
         .done((document) => { 
            DocumentHelper.log("Document loaded with " + document.pages.count + " pages", document); 
            // Check its cache info 
            lt.Document.DocumentFactory.checkCacheInfo(document.documentId) 
               .done((cacheInfo) => { 
                  if (cacheInfo) { 
                     // Found, show it 
                     DocumentHelper.log("Document was found in the cache"); 
                     DocumentHelper.log("IsVirtual is " + cacheInfo.isVirtual); 
                     DocumentHelper.log("IsLoaded is " + cacheInfo.isLoaded); 
                     DocumentHelper.log("HasAnnotations is " + cacheInfo.hasAnnotations); 
                     DocumentHelper.log("Name is " + cacheInfo.name); 
                     DocumentHelper.log("MIMEType is " + cacheInfo.mimeType); 
                     DocumentHelper.log("MIMEType accepted " + cacheInfo.isMimeTypeAccepted); 
                     DocumentHelper.log("Number of Pages is " + cacheInfo.pageCount); 
                  } else { 
                     DocumentHelper.log("Document was not found in the cache"); 
                  } 
               }) 
               .fail(DocumentHelper.showServiceError); 
         }) 
         .fail(DocumentHelper.showServiceError); 
   } 
}

export class DocumentHelper { 
   static showServiceError = (jqXHR, statusText, errorThrown) => { 
      alert("Error returned from service. See the console for details."); 
      const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown); 
      console.error(serviceError); 
   } 
 
   static log = (message, data) => { 
      const outputElement = document.getElementById("output"); 
      if (outputElement) { 
         const time = (new Date()).toLocaleTimeString(); 
         const textElement = document.createElement("p"); 
         textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message; 
         outputElement.insertBefore(textElement, outputElement.firstChild); 
      } 
 
      if (!data) 
         console.log(message); 
      else 
         console.log(message, data); 
   } 
 
   static initFactory = () => { 
      // To communicate with the DocumentsService, it must be running! 
      // Change these parameters to match the path to the service. 
      lt.Document.DocumentFactory.serviceHost = "http://localhost:40000"; 
      lt.Document.DocumentFactory.servicePath = ""; 
      lt.Document.DocumentFactory.serviceApiPath = "api"; 
   } 
}

<!doctype html> 
<html lang="en"> 
<title>Document Example | CheckCacheInfo</title> 
 
<head> 
   <script src="https://code.jquery.com/jquery-2.2.4.min.js" 
      integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script> 
 
   <script src="../../LT/Leadtools.js"></script> 
   <script src="../../LT/Leadtools.Controls.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Engine.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Designers.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Rendering.Javascript.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Automation.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Main.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Color.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Core.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Effects.js"></script> 
   <script src="../../LT/Leadtools.Document.js"></script> 
   <script src="../../LT/Leadtools.Document.Viewer.js"></script> 
   <link rel="stylesheet" type="text/css" href="../../css/examples.css"> 
 
   <!-- All demo files are bundled and appended to the window --> 
   <script src="../../bundle.js" type="text/javascript"></script> 
</head> 
 
<body> 
   <div> 
      <button type="button" id="exampleButton">Run Example</button> 
   </div> 
   <div id="output"></div> 
   <div> 
      <img id="img" /> 
   </div> 
</body> 
 
<script> 
   window.onload = () => { 
      const example = new window.examples.DocumentFactory.CheckCacheInfo(); 
      example.run("exampleButton"); 
   }; 
</script> 
</html>