From ccc5d041f990161f0b95707133afab72548afb08 Mon Sep 17 00:00:00 2001
From: cn1010 <1062108372@qq.com>
Date: Tue, 10 Dec 2019 16:42:23 +0800
Subject: [PATCH] Dispose ApplicationEngine after using (#167)

---
 RpcNep5Tracker/RpcNep5Tracker.cs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/RpcNep5Tracker/RpcNep5Tracker.cs b/RpcNep5Tracker/RpcNep5Tracker.cs
index 231d0578a..ae22a79e0 100644
--- a/RpcNep5Tracker/RpcNep5Tracker.cs
+++ b/RpcNep5Tracker/RpcNep5Tracker.cs
@@ -191,10 +191,12 @@ public void OnPersist(Snapshot snapshot, IReadOnlyList<Blockchain.ApplicationExe
                     script = sb.ToArray();
                 }
 
-                ApplicationEngine engine = ApplicationEngine.Run(script, snapshot, extraGAS: new Fixed8(100000000));
-                if (engine.State.HasFlag(VMState.FAULT)) continue;
-                if (engine.ResultStack.Count <= 0) continue;
-                nep5BalancePair.Value.Balance = engine.ResultStack.Pop().GetBigInteger();
+                using (ApplicationEngine engine = ApplicationEngine.Run(script, snapshot, extraGAS: new Fixed8(100000000)))
+                {
+                    if (engine.State.HasFlag(VMState.FAULT)) continue;
+                    if (engine.ResultStack.Count <= 0) continue;
+                    nep5BalancePair.Value.Balance = engine.ResultStack.Pop().GetBigInteger();
+                }
                 nep5BalancePair.Value.LastUpdatedBlock = snapshot.Height;
                 if (nep5BalancePair.Value.Balance == 0)
                 {