clean state cache in 30 seconds

readme.md

@@ -8,7 +8,7 @@ All you need to do is:
 - Find out the selectors for target data
 - Type scripts in the console of `extension backgroud page`, as introduced bellow.
 
- ![](images/console.png)
+ ![](template/assets/console.png)
 
 ## Qucik Start
 
@@ -52,10 +52,7 @@ function (itemsSelector:string, fieldSelectors:string[], urls:ExtractResult)
 
 ## Stop Tasks
 
-The only way to stop tasks before its finish, is `Closing the target tab`.
-
-> Tasks wait for their target elements' appearance, given some elements were loaded asynchronously.  
-> If you typed wrong selectors, the task waits forever for  elements which don't exists.
+Close the target tab, in which current tasks is running.
 
 ## Extract Attributes.
 
@@ -126,17 +123,17 @@ e.export(1)
 
 Sometimes, it's hard to finish them in an single execution, that why we need "Continuing of Tasks".
 
-You can always continue tasks (with following), even it stops in the middle of a task:
+You can always continue tasks by start it again, not matter in what phase it stops.
 
 ```js
 e.start()
 ```
 
-The `Extractor` kept the state of last execution, and starts from where it stopped.
+The `Extractor` kept the execution state, and starts from where it stopped.
 
 ### Restart Tasks
 
-What should I do, if I don't like to continue from last state, but restart from certain task?
+What if I don't like to continue from last state, but restart certain tasks?
 
 ```js
 // restart all tasks
@@ -166,12 +163,15 @@ e.save();
 
 Load the state:
 
-Open the popup window, upload the saved state file. Then, and in the backgoud console:
+Open the popup window, upload the saved state file. Then, and in the backgroud console:
 
 ```js
 e = new Extractor().load();
+e.start();
 ```
 
+> The uploaded state will be cleaned in 30 seconds, if you don't load it.
+
 ## Developpment
 
 Clone this project and execute:

src/background/caches.ts

@@ -11,5 +11,12 @@ export class Caches {
     setState(name: string, content: string) {
         this._state = content;
         logger.info(`State (${name}) recieved. To load it: some_var = new Extractor().load()`);
+        // clear cache in 30 seconds
+        setTimeout(() => {
+            if (this._state) {
+                logger.info(`Uploaded state is cleaned after 30 second.`);
+                this._state = "";
+            }
+        }, 30000);
     }
 }