1 files changed, 15 insertions, 0 deletions
diff --git a/src/main/java/com/keuin/kbackupfabric/autobackup/PlayerActivityTracker.java b/src/main/java/com/keuin/kbackupfabric/autobackup/PlayerActivityTracker.java
new file mode 100644
index 0000000..ef2b85e
--- /dev/null
+++ b/src/main/java/com/keuin/kbackupfabric/autobackup/PlayerActivityTracker.java
@@ -0,0 +1,15 @@
+package com.keuin.kbackupfabric.autobackup;
+
+public interface PlayerActivityTracker {
+    /**
+     * Update the checkpoint, return accumulated result.
+     *
+     * @return if there is at least one player logged in since last checkpoint.
+     */
+    boolean getCheckpoint();
+
+    /**
+     * Mark dirty. In the next checkpoint, the backup will be performed.
+     */
+    void setCheckpoint();
+}