Fixes issue #42 - scheduler class with simple CRON scheduling methods

src/classes/Scheduler.cls

@@ -0,0 +1,28 @@
+/*************************************************************************************************
+* This file is part of the Nebula Framework project, released under the MIT License.             *
+* See LICENSE file or go to https://github.com/jongpie/NebulaFramework for full license details. *
+*************************************************************************************************/
+public class Scheduler {
+    //CRON order - Seconds, Minutes, Hours, Day_of_month, Month, Day_of_week, Optional_year
+    public final static String DAILY_CRON = '0 {0} {1} * * ?';
+    public final static String HOURLY_CRON = '0 {0} * * * ?';
+    private final Schedulable scheduledClass;
+
+    public Scheduler (Schedulable scheduledClass)  {
+        this.scheduledClass = scheduledClass;
+    }
+
+    public String scheduleHourly(String jobName, String startingMinuteInHour) {
+        String hourlyCRON = String.format(HOURLY_CRON, new List<String>{startingMinuteInHour});
+        return this.schedule(jobName, hourlyCRON);
+    }
+
+    public String scheduleDaily(String jobName, List<String> startingHourAndMinute) {
+        String dailyCRON = String.format(DAILY_CRON, startingHourAndMinute);
+        return this.schedule(jobName, dailyCRON);
+    }
+
+    public String schedule(String jobName, String cronExpression) {
+        return System.schedule(jobName, cronExpression, this.scheduledClass);
+    }
+}

src/classes/Scheduler.cls-meta.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>39.0</apiVersion>
+    <status>Active</status>
+</ApexClass>