feat: add RequestOfflineFloatingLicense method for offline license leasing

src/main/java/com/cryptlex/lexfloatclient/LexFloatClient.java

@@ -318,6 +318,21 @@ public static int GetFloatingClientMeterAttributeUses(String name) throws LexFlo
         throw new LexFloatClientException(status);
     }
 
+    /**
+     * Sends the request to lease the license from the LexFloatServer for offline usage.
+     * The maximum value of lease duration is configured in the config.yml of LexFloatServer.
+     *
+     * @param leaseDuration value of the lease duration.
+     * @throws LexFloatClientException
+     */
+    public static void RequestOfflineFloatingLicense(int leaseDuration) throws LexFloatClientException {
+        int status;
+        status = LexFloatClientNative.RequestOfflineFloatingLicense(leaseDuration);
+        if (LF_OK != status) {
+            throw new LexFloatClientException(status);
+        }
+    }
+
     /**
      * Sends the request to lease the license from the LexFloatServer
      *

src/main/java/com/cryptlex/lexfloatclient/LexFloatClientNative.java

@@ -65,6 +65,8 @@ public interface CallbackType extends Callback {
 
     public static native int GetFloatingClientMeterAttributeUses(WString name, IntByReference uses);
 
+    public static native int RequestOfflineFloatingLicense(int leaseDuration);
+
     public static native int RequestFloatingLicense();
 
     public static native int DropFloatingLicense();