1 files changed, 226 insertions, 0 deletions
diff --git a/server/src/connectionpool.h b/server/src/connectionpool.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set et sw=2 ts=2: */
+/***************************************************************************
+ *            connectionpool.h
+ *
+ *  Wed Dec 16 12:20:44 CET 2009
+ *  Copyright 2009 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of Pracro.
+ *
+ *  Pracro is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Pracro 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 Pracro; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#ifndef __PRACRO_CONNECTIONPOOL_H__
+#define __PRACRO_CONNECTIONPOOL_H__
+
+#include <list>
+
+#include "mutex.h"
+#include "semaphore.h"
+
+template <class T>
+class ConnectionPool {
+public:
+  void add(T t);
+  void remove(T t);
+
+  bool testFree(T t);
+  int numFree();
+
+  T borrow();
+  void giveBack(T t);
+
+  std::list<T> clear(bool force = true);
+
+private:
+  bool contains(std::list<T> &list, T t);
+
+  Semaphore semaphore;
+  Mutex mutex;
+  std::list<T> active;
+  std::list<T> passive;
+};
+
+template <class T>
+class AutoBorrower {
+public:
+  AutoBorrower(ConnectionPool<T> &pool);
+  ~AutoBorrower();
+
+  T get();
+
+private:
+  ConnectionPool<T> &pool;
+  T t;
+};
+
+
+//
+// Implementation is below
+//
+
+template <class T>
+void ConnectionPool<T>::add(T t)
+{
+  MutexAutolock lock(mutex);
+
+  passive.push_back(t);
+  semaphore.post();
+
+}
+
+template <class T>
+bool ConnectionPool<T>::contains(std::list<T> &list, T t)
+{
+  typename std::list<T>::iterator i = list.begin();
+  while(i != list.end()) {
+    if(*i == t) return true;
+    i++;
+  }
+
+  return false;
+}
+
+template <class T>
+void ConnectionPool<T>::remove(T t)
+{
+  MutexAutolock lock(mutex); 
+
+  if(contains(passive, t)) {
+    semaphore.post();
+    passive.remove(t);
+  }
+
+}
+
+template <class T>
+bool ConnectionPool<T>::testFree(T t)
+{
+  bool testfree = false;
+
+  MutexAutolock lock(mutex);
+  testfree = contains(passive, t);
+
+  return testfree;
+}
+
+template <class T>
+int ConnectionPool<T>::numFree()
+{
+  int num;
+
+  MutexAutolock lock(mutex);
+  num = passive.size();
+
+  return num;
+}
+
+template <class T>
+T ConnectionPool<T>::borrow()
+{
+  T t = NULL;
+
+  semaphore.wait();
+
+  {
+    MutexAutolock lock(mutex);
+
+    t = passive.front();
+    passive.remove(t);
+    active.push_back(t);
+  }
+
+  return t;
+}
+
+template <class T>
+void ConnectionPool<T>::giveBack(T t)
+{
+  MutexAutolock lock(mutex);
+
+  if(contains(active, t)) {
+    active.remove(t);
+    passive.push_back(t);
+    semaphore.post();
+  }
+}
+
+template <class T>
+std::list<T> ConnectionPool<T>::clear(bool force)
+{
+  typename std::list<T> lst;
+
+  if(force == false) {
+    size_t num = 0;
+    {
+      MutexAutolock lock(mutex);
+      num = active.size() + passive.size();
+    }
+
+    while(num) {
+      borrow();
+      num--;
+    }
+  }
+
+  {
+    MutexAutolock lock(mutex);
+
+    typename std::list<T>::iterator i;
+
+    i = active.begin();
+    while(i != active.end()) {
+      lst.push_back(*i);
+      //      i = active.erase(i);
+      semaphore.post();
+      i++;
+    }
+    active.clear();
+
+    i = passive.begin();
+    while(i != passive.end()) {
+      lst.push_back(*i);
+      //      i = passive.erase(i);
+      i++;
+    }
+    passive.clear();
+  }
+
+  return lst;
+}
+
+template <class T>
+AutoBorrower<T>::AutoBorrower(ConnectionPool<T> &p)
+  : pool(p)
+{
+  t = pool.borrow();
+}
+
+template <class T>
+AutoBorrower<T>::~AutoBorrower()
+{
+  pool.giveBack(t);
+}
+
+template <class T>
+T AutoBorrower<T>::get()
+{
+  return t;
+}
+
+#endif/*__PRACRO_CONNECTIONPOOL_H__*/