icinga2/lib/base/registry.hpp

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/******************************************************************************
* Icinga 2 *
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* Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/) *
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* *
* This program 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. *
* *
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#ifndef REGISTRY_H
#define REGISTRY_H
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#include "base/i2-base.hpp"
#include "base/string.hpp"
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#include <map>
#include <boost/thread/mutex.hpp>
#include <boost/signals2.hpp>
#include <boost/foreach.hpp>
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namespace icinga
{
/**
* A registry.
*
* @ingroup base
*/
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template<typename U, typename T>
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class Registry
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{
public:
typedef std::map<String, T> ItemMap;
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void RegisterIfNew(const String& name, const T& item)
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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if (m_Items.find(name) != m_Items.end())
return;
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RegisterInternal(name, item, lock);
}
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void Register(const String& name, const T& item)
{
boost::mutex::scoped_lock lock(m_Mutex);
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RegisterInternal(name, item, lock);
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}
void Unregister(const String& name)
{
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size_t erased;
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{
boost::mutex::scoped_lock lock(m_Mutex);
erased = m_Items.erase(name);
}
if (erased > 0)
OnUnregistered(name);
}
void Clear(void)
{
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typename Registry<U, T>::ItemMap items;
{
boost::mutex::scoped_lock lock(m_Mutex);
items = m_Items;
}
typedef typename std::pair<String, T> ItemMapPair;
BOOST_FOREACH(const ItemMapPair& kv, items) {
OnUnregistered(kv.first);
}
{
boost::mutex::scoped_lock lock(m_Mutex);
m_Items.clear();
}
}
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T GetItem(const String& name) const
{
boost::mutex::scoped_lock lock(m_Mutex);
typename ItemMap::const_iterator it;
it = m_Items.find(name);
if (it == m_Items.end())
return T();
return it->second;
}
ItemMap GetItems(void) const
{
boost::mutex::scoped_lock lock(m_Mutex);
return m_Items; /* Makes a copy of the map. */
}
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boost::signals2::signal<void (const String&, const T&)> OnRegistered;
boost::signals2::signal<void (const String&)> OnUnregistered;
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private:
mutable boost::mutex m_Mutex;
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typename Registry<U, T>::ItemMap m_Items;
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void RegisterInternal(const String& name, const T& item, boost::mutex::scoped_lock& lock)
{
bool old_item = false;
if (m_Items.erase(name) > 0)
old_item = true;
m_Items[name] = item;
lock.unlock();
if (old_item)
OnUnregistered(name);
OnRegistered(name, item);
}
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};
}
#endif /* REGISTRY_H */