opensourcelib · January 18, 2016 14:54 · Jan 18, 2016
diff --git a/Lockmagentoprocess.php b/Lockmagentoprocess.php
@@ -0,0 +1,66 @@
+<?php
+
+class Lockmagentoprocess
+{
+    /**
+     * Our process ID.
+     */
+    const PROCESS_ID = 'ProcessId';
+
+    /**
+     * Mage_Index_Model_Process will provide us a lock file API.
+     *
+     * @var Mage_Index_Model_Process $indexProcess
+     */
+    private $indexProcess;
+
+    /**
+     * Constructor.  Instantiate the Process model, and set our custom
+     * batch process ID.
+     */
+    public function __construct()
+    {
+        $this->indexProcess = new Mage_Index_Model_Process();
+
+        $this->indexProcess->setId(self::PROCESS_ID);
+    }
+
+    /**
+     * Process all the things!
+     */
+    public function changeEverything()
+    {
+        if ($this->indexProcess->isLocked())
+        {
+            $this->log(sprintf("Another %s process is running!  Abort", self::PROCESS_ID));
+            return false;
+        }
+
+        // Set an exclusive lock.
+        $this->indexProcess->lockAndBlock();
+
+        $this->log("Starting...hold on to your hats.");
+
+        for ($i = 1; $i < 1000; $i++)
+        {
+            // Do something complicated with $i.
+        }
+
+        $this->log("Finished!  Whew.");
+
+        // Remove the lock.
+        $this->indexProcess->unlock();
+
+        return true;
+    }
+
+    /**
+     * Log a message to stdout.
+     *
+     * @param $msg
+     */
+    public function log($msg)
+    {
+        echo $msg . PHP_EOL;
+    }
+}