1 files changed, 66 insertions, 0 deletions
diff --git a/connection-management.hh b/connection-management.hh
new file mode 100644
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--- /dev/null
+++ b/connection-management.hh
@@ -0,0 +1,66 @@
+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#pragma once
+
+#include "lock.hh"
+
+class ConcurrentConnectionManager
+{
+public:
+  ConcurrentConnectionManager(size_t max)
+  {
+    setMaxConcurrentConnections(max);
+  }
+
+  void setMaxConcurrentConnections(size_t max)
+  {
+    d_data.lock()->d_maxConcurrentConnections = max;
+  }
+
+  size_t getMaxConcurrentConnections()
+  {
+    return d_data.lock()->d_maxConcurrentConnections;
+  }
+
+  bool registerConnection()
+  {
+    auto data = d_data.lock();
+    if (data->d_maxConcurrentConnections == 0 || data->d_currentConnectionsCount < data->d_maxConcurrentConnections) {
+      ++data->d_currentConnectionsCount;
+      return true;
+    }
+    return false;
+  }
+
+  void releaseConnection()
+  {
+    --(d_data.lock()->d_currentConnectionsCount);
+  }
+
+private:
+  struct Data {
+    size_t d_maxConcurrentConnections{0};
+    size_t d_currentConnectionsCount{0};
+  };
+
+  LockGuarded<Data> d_data;
+};