From 6c46fed10dd71b727808c3469f4403bd85d49ed9 Mon Sep 17 00:00:00 2001
From: Nathan Schwarz <nathan.schwarz97@gmail.com>
Date: Fri, 19 Feb 2021 00:07:07 +0100
Subject: [PATCH] [README]: added instructions about recurring task
 initialization

---
 README.md | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index e47406d..317a2de 100644
--- a/README.md
+++ b/README.md
@@ -195,14 +195,33 @@ in such case your overall system should be **slowed down** because some of the p
 ```
   import { add } from 'date-fns/date' // external library to handle date objects
 
-  function schedTask(job) {
+  function recurringTask(job) {
     // do something
     const dueDate = add(new Date(), { minutes: 10 })
-    TaskQueue.addTask({ taskType: 'schedTask', priority: 1, data: {}, dueDate })
+    TaskQueue.addTask({ taskType: 'recurringTask', priority: 1, data: {}, dueDate })
   }
 
   const taskMap = {
-    schedTask
+    recurringTask
+  }
+```
+
+Because the next recurring task is kept in the queue, if the server is restarted, it will start the recurring task again.
+Be sure to remove all recurring task *on the master* before starting others, or lock the insert :
+
+You can either do :
+
+`Meteor.startup(() => {
+  if (Cluster.isMaster()) {
+    TaskQueue.remove({ tasType: 'recurringTask' })
+  }  
+})`
+
+or at task *initialization* :
+```
+  const recurringTaskExists = TaskQueue.findOne({ taskType: 'recurringTask' }) !== undefined
+  if (!recurringTaskExists) {
+    TaskQueue.addtask({ taskType: 'recurringTask', priority: 1, data: {}, dueDate })
   }
 ```