add getter for identifier and allow disabling of auto lock break on d…

…estruct

src/EtcdLock.php

@@ -234,6 +234,13 @@ public static function setDelayPerUnavailableRetry(int $delayPerRetry)
      */
     protected $retries = 0;
 
+    /**
+     * Automatically try to break the lock on destruct if possible
+     *
+     * @var bool
+     */
+    protected $breakOnDestruct = true;
+
     /**
      * Create a lock
      *
@@ -295,6 +302,26 @@ public function isLocked()
         return false;
     }
 
+    /**
+     * Get the used identifier for this lock
+     *
+     * @return string
+     */
+    public function getIdentifier(): ?string
+    {
+        return $this->identifier;
+    }
+
+    /**
+     * Dis/enable automatic lock break on object destruct
+     *
+     * @param bool $breakOnDestruct
+     */
+    public function setBreakOnDestruct(bool $breakOnDestruct): void
+    {
+        $this->breakOnDestruct = $breakOnDestruct;
+    }
+
     /**
      * Refresh the lock
      *
@@ -559,7 +586,7 @@ protected function updateFromString($lockString)
      */
     public function __destruct()
     {
-        if ($this->isLocked()) {
+        if ($this->breakOnDestruct && $this->isLocked()) {
             $this->break();
         }
     }