Files.app; Serializes event handler calls for particular URLs.

chrome/browser/resources/file_manager/background/js/drive_sync_handler.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 /**
  * Handler of the background page for the drive sync events.
  * @param {ProgressCenter} progressCenter Progress center to submit the
  *     progressing items.
  * @constructor
  */
 function DriveSyncHandler(progressCenter) {
   /**
    * Progress center to submit the progressng item.
    * @type {ProgressCenter}
    * @private
    */
   this.progressCenter_ = progressCenter;
 
   /**
    * Counter for progress ID.
    * @type {number}
    * @private
    */
   this.idCounter_ = 0;
 
   /**
-   * Progressing file names.
-   * @type {Object.<string, ProgressCenterItem>} Map a file URL and a progress
-   *     center item.
+   * Map of file urls and progress center items.
+   * @type {Object.<string, ProgressCenterItem>}
    * @private
    */
   this.items_ = {};
 
+  /**
+   * Async queue.
+   * @type {AsyncUtil.Queue}
+   * @private
+   */
+  this.queue_ = new AsyncUtil.Queue();
+
   // Register events.
   chrome.fileBrowserPrivate.onFileTransfersUpdated.addListener(
       this.onFileTransfersUpdated_.bind(this));
   chrome.fileBrowserPrivate.onDriveSyncError.addListener(
       this.onDriveSyncError_.bind(this));
 }
 
 /**
  * Completed event name.
  * @type {string}
@@ skipping 49 matching lines @@
     }
   }
 };
 
 /**
  * Updates the item involved with the given status.
  * @param {FileTransferStatus} status Transfer status.
  * @private
  */
 DriveSyncHandler.prototype.updateItem_ = function(status) {
-  webkitResolveLocalFileSystemURL(status.fileUrl, function(entry) {
-    var item;
+  this.queue_.run(function(callback) {
     if (!this.items_[status.fileUrl]) {
-      item = new ProgressCenterItem();
-      item.id = DriveSyncHandler.PROGRESS_ITEM_ID_PREFIX + (this.idCounter_++);
-      item.type = ProgressItemType.SYNC;
-      item.quiet = true;
-      item.message = strf('SYNC_FILE_NAME', entry.name);
-      item.cancelCallback = this.requestCancel_.bind(this, entry);
-      this.items_[status.fileUrl] = item;
-    } else {
-      item = this.items_[status.fileUrl];
+      webkitResolveLocalFileSystemURL(status.fileUrl, function(entry) {
+        var item = new ProgressCenterItem();
+        item.id =
+            DriveSyncHandler.PROGRESS_ITEM_ID_PREFIX + (this.idCounter_++);
+        item.type = ProgressItemType.SYNC;
+        item.quiet = true;
+        item.message = strf('SYNC_FILE_NAME', entry.name);
+        item.cancelCallback = this.requestCancel_.bind(this, entry);
+        this.items_[status.fileUrl] = item;
+        callback();
+      }.bind(this), function(error) {
+        console.warn('Resolving URL ' + status.fileUrl + ' is failed: ', error);
+        callback();
+      });
+    }
+  }.bind(this));
+  this.queue_.run(function(callback) {
+    var item = this.items_[status.fileUrl];
+    if (!item) {
+      callback();
+      return;
     }
     item.progressValue = status.processed || 0;
     item.progressMax = status.total || 1;
     this.progressCenter_.updateItem(item);
-  }.bind(this), function() {
-    console.error('Cannot resolve the URL: ' + status.fileUrl);
-  });
+    callback();
+  }.bind(this));
 };
 
 /**
  * Removes the item involved with the given status.
  * @param {FileTransferStatus} status Transfer status.
  * @private
  */
 DriveSyncHandler.prototype.removeItem_ = function(status) {
-  var item = this.items_[status.fileUrl];
-  delete this.items_[status.fileUrl];
-  if (item) {
+  this.queue_.run(function(callback) {
+    var item = this.items_[status.fileUrl];
+    if (!item) {
+      callback();
+      return;
+    }
     item.state = status.transferState === 'completed' ?
         ProgressItemState.COMPLETED : ProgressItemState.CANCELED;
     this.progressCenter_.updateItem(item);
-  }
+    delete this.items_[status.fileUrl];
+    callback();
+  }.bind(this));
 };
 
 /**
  * Requests to cancel for the given files' drive sync.
  * @param {Entry} entry Entry to be canceled.
  * @private
  */
 DriveSyncHandler.prototype.requestCancel_ = function(entry) {
   chrome.fileBrowserPrivate.cancelFileTransfers([entry.toURL()], function() {});
 };
@@ skipping 19 matching lines @@
       case 'service_unavailable':
         item.message = str('SYNC_SERVICE_UNAVAILABLE_ERROR');
         break;
       case 'misc':
         item.message = strf('SYNC_MISC_ERROR', entry.name);
         break;
     }
     this.progressCenter_.updateItem(item);
   }.bind(this));
 };