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From "Aaron (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CB-9236) File plugin takes 500+ms on iOS, causing web thread to lock until done
Date Tue, 23 Jun 2015 16:28:01 GMT
Aaron created CB-9236:
-------------------------

             Summary: File plugin takes 500+ms on iOS, causing web thread to lock until done
                 Key: CB-9236
                 URL: https://issues.apache.org/jira/browse/CB-9236
             Project: Apache Cordova
          Issue Type: Improvement
          Components: iOS, Plugin File
    Affects Versions: 5.0.0
         Environment: iPad mini retina, iPad air 2. Both running iOS 8.3
            Reporter: Aaron


Hello,

I'm using the file API to store a gif created by the yahoo gifshot plugin. When the gifshot
callback fires, i see in the xcode logs:

2015-06-23 12:07:42.467 AppName[5446:2010157] THREAD WARNING: ['File'] took '12.512939' ms.
Plugin should use a background thread.
2015-06-23 12:07:43.094 AppName[5446:2010157] THREAD WARNING: ['File'] took '566.554932' ms.
Plugin should use a background thread

This tends to interrupt interactions in the webview, such as typing into a form, tapping buttons,
canvas animations, etc. I'm wondering if it's possible to get this running a separate thread.
Note that a couple apps ive seen this in have been for iOS only. I do not have the means to
run this on android & test, because it is using a custom plugin only built for iOS. So
i cannot make a test case there.

Here's the respected javascript code:
{code:javascript}
    window.requestFileSystem(window.LocalFileSystem.PERSISTENT, 0, function (fileSys) {
      var myFolderApp = 'AppFolder';
      fileSys.root.getDirectory(myFolderApp, { create: true, exclusive: false }, function
(directory) {
        fileSys.root.getFile(directory.fullPath + "/" + Date.now() + ".gif", { create: true,
exclusive: false }, function (entry) {
          entry.createWriter(function (writer) {
            writer.onwriteend = function () {
              _this.processingAGif = false;
              if (InteractionStore.getByUUID(interactionUUID)) {
                MediaStore.saveForUUID(interactionUUID, entry.fullPath);
                if (InteractionStore.getByUUID(interactionUUID).complete) {
                  InteractionStore.commitInteraction(interactionUUID);
                }
                else {
                  InteractionStore.setUUIDToProcessed(interactionUUID);
                }
              }
            };
            writer.write(_this.dataURItoBlob(_this.imagebase64));
          });
        });
      });
    });
{code}

The InteractionStore and MediaStore are just memory stores for small bits of data. Inconsequential
at this point. The commitInteraction writes the paths to the websql store.



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