From 65cba1464ae1ca5a00ec3adab50847cdc53daee8 Mon Sep 17 00:00:00 2001
From: Jim Martens <github@2martens.de>
Date: Wed, 31 May 2017 15:12:14 +0200
Subject: [PATCH] Prevented two threads from persisting at the same time

Signed-off-by: Jim Martens <github@2martens.de>
---
 04/src/PersistenceManager.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/04/src/PersistenceManager.java b/04/src/PersistenceManager.java
index 3cf11bc..f3aaa27 100644
--- a/04/src/PersistenceManager.java
+++ b/04/src/PersistenceManager.java
@@ -197,7 +197,7 @@ public class PersistenceManager {
     /**
      * Checks for full buffer and persists data of committed transactions to storage if buffer is full.
      */
-    private void persist() {
+    private synchronized void persist() {
         if (_pageBuffer.size() <= 5) {
             return;
         }