From b7b98fbd4130597175d3da49d5be06142dbdc4cd Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Sun, 12 Nov 2023 00:21:04 +0300
Subject: Key-based locking in signature verification

---
 src/main/java/com/juick/util/ReentrantLockMap.java | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/main/java/com/juick/util/ReentrantLockMap.java

(limited to 'src/main/java/com/juick/util/ReentrantLockMap.java')

diff --git a/src/main/java/com/juick/util/ReentrantLockMap.java b/src/main/java/com/juick/util/ReentrantLockMap.java
new file mode 100644
index 00000000..36aee218
--- /dev/null
+++ b/src/main/java/com/juick/util/ReentrantLockMap.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2008-2023, Juick
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.juick.util;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class ReentrantLockMap {
+
+    ConcurrentHashMap<String, ReentrantLock> mapStringLock;
+
+    public ReentrantLockMap() {
+        mapStringLock = new ConcurrentHashMap<>();
+    }
+
+    public ReentrantLock getLock(String key) {
+        ReentrantLock initValue = createIntanceLock();
+        ReentrantLock lock = mapStringLock.putIfAbsent(key, initValue);
+        if (lock == null) {
+            lock = initValue;
+        }
+        return lock;
+    }
+
+    public void retainLock(String key) {
+        mapStringLock.remove(key);
+    }
+
+    protected ReentrantLock createIntanceLock() {
+        return new ReentrantLock();
+    }
+}
-- 
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