queue emails right away if a user is not online, no point waiting.

app/models/user_email_observer.rb

@@ -36,7 +36,9 @@ class UserEmailObserver < ActiveRecord::Observer
 
     def enqueue(type)
       return unless notification.user.email_direct?
-      Jobs.enqueue_in(SiteSetting.email_time_window_mins.minutes,
+
+
+      Jobs.enqueue_in(delay,
                      :user_email,
                      type: type,
                      user_id: notification.user_id,
@@ -45,12 +47,22 @@ class UserEmailObserver < ActiveRecord::Observer
 
     def enqueue_private(type)
       return unless (notification.user.email_direct? && notification.user.email_private_messages?)
-      Jobs.enqueue_in(SiteSetting.email_time_window_mins.minutes,
+      Jobs.enqueue_in(delay,
                       :user_email,
                       type: type,
                       user_id: notification.user_id,
                       notification_id: notification.id)
     end
+
+    def delay
+      mins = SiteSetting.email_time_window_mins.minutes
+      if  notification.user &&
+          (!notification.user.last_seen_at || notification.user.last_seen_at < mins.ago)
+        0
+      else
+        mins
+      end
+    end
   end
 
   def after_commit(notification)
@@ -65,6 +77,7 @@ class UserEmailObserver < ActiveRecord::Observer
 
   private
 
+
   def extract_notification_type(notification)
     Notification.types[notification.notification_type]
   end

spec/models/user_email_observer_spec.rb

@@ -8,6 +8,12 @@ describe UserEmailObserver do
     let!(:notification) { Fabricate(:notification, user: user) }
 
     it "enqueues a job for the email" do
+      Jobs.expects(:enqueue_in).with(0, :user_email, type: :user_mentioned, user_id: notification.user_id, notification_id: notification.id)
+      UserEmailObserver.send(:new).after_commit(notification)
+    end
+
+    it "enqueue a delayed job for users that are online" do
+      user.last_seen_at = 1.minute.ago
       Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, type: :user_mentioned, user_id: notification.user_id, notification_id: notification.id)
       UserEmailObserver.send(:new).after_commit(notification)
     end
@@ -26,7 +32,7 @@ describe UserEmailObserver do
     let!(:notification) { Fabricate(:notification, user: user, notification_type: 9) }
 
     it "enqueues a job for the email" do
-      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, type: :user_posted, user_id: notification.user_id, notification_id: notification.id)
+      Jobs.expects(:enqueue_in).with(0, :user_email, type: :user_posted, user_id: notification.user_id, notification_id: notification.id)
       UserEmailObserver.send(:new).after_commit(notification)
     end
 
@@ -44,7 +50,7 @@ describe UserEmailObserver do
     let!(:notification) { Fabricate(:notification, user: user, notification_type: 2) }
 
     it "enqueues a job for the email" do
-      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, type: :user_replied, user_id: notification.user_id, notification_id: notification.id)
+      Jobs.expects(:enqueue_in).with(0, :user_email, type: :user_replied, user_id: notification.user_id, notification_id: notification.id)
       UserEmailObserver.send(:new).after_commit(notification)
     end
 
@@ -62,13 +68,13 @@ describe UserEmailObserver do
     let!(:notification) { Fabricate(:notification, user: user, notification_type: 3) }
 
     it "enqueues a job for the email" do
-      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, type: :user_quoted, user_id: notification.user_id, notification_id: notification.id)
+      Jobs.expects(:enqueue_in).with(0, :user_email, type: :user_quoted, user_id: notification.user_id, notification_id: notification.id)
       UserEmailObserver.send(:new).after_commit(notification)
     end
 
     it "doesn't enqueue an email if the user has mention emails disabled" do
       user.expects(:email_direct?).returns(false)
-      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, has_entry(type: :user_quoted)).never
+      Jobs.expects(:enqueue_in).with(0, :user_email, has_entry(type: :user_quoted)).never
       UserEmailObserver.send(:new).after_commit(notification)
     end
 
@@ -80,13 +86,13 @@ describe UserEmailObserver do
     let!(:notification) { Fabricate(:notification, user: user, notification_type: 7) }
 
     it "enqueues a job for the email" do
-      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, type: :user_invited_to_private_message, user_id: notification.user_id, notification_id: notification.id)
+      Jobs.expects(:enqueue_in).with(0, :user_email, type: :user_invited_to_private_message, user_id: notification.user_id, notification_id: notification.id)
       UserEmailObserver.send(:new).after_commit(notification)
     end
 
     it "doesn't enqueue an email if the user has mention emails disabled" do
       user.expects(:email_direct?).returns(false)
-      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, has_entry(type: :user_invited_to_private_message)).never
+      Jobs.expects(:enqueue_in).with(0, :user_email, has_entry(type: :user_invited_to_private_message)).never
       UserEmailObserver.send(:new).after_commit(notification)
     end