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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2010 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WT_DBO_FIXED_SQL_CONNECTION_POOL_H_
#define WT_DBO_FIXED_SQL_CONNECTION_POOL_H_

#include <Wt/Dbo/SqlConnectionPool>

#include <vector>

namespace Wt {
  namespace Dbo {
    namespace Impl {
      struct FixedSqlConnectionPoolImpl;
    }

/*! \class FixedSqlConnectionPool Wt/Dbo/FixedSqlConnectionPool Wt/Dbo/FixedSqlConnectionPool
 *  \brief A connection pool of fixed size.
 *
 * This provides a connection pool of fixed size: its size is determined at
 * startup time, and the pool will not grow as more connections are needed.
 *
 * This is adequate when the number of threads (which need different
 * connections to work with) is also bounded, like when using a fixed
 * size thread pool. This is for example the case when used in
 * conjunction with %Wt. Note that you do not need as many connections
 * as sessions, since Session will only use a connection while
 * processing a transaction.
 *
 * \ingroup dbo
 */
class WTDBO_API FixedSqlConnectionPool : public SqlConnectionPool
{
public:
  /*! \brief Creates a fixed connection pool.
   *
   * The pool is initialized with the provided \p connection, which is
   * cloned (\p size - 1) times.
   *
   * The pool thus takes ownership of the given connection.
   */
  FixedSqlConnectionPool(SqlConnection *connection, int size);

  virtual ~FixedSqlConnectionPool();
  virtual SqlConnection *getConnection();
  virtual void returnConnection(SqlConnection *);

private:
  Impl::FixedSqlConnectionPoolImpl *impl_;
};

  }
}

#endif // WT_DBO_SQL_CONNECTION_POOL_H_