icinga2/lib/icinga/hostgroup.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
* *
* 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. *
******************************************************************************/
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#include "icinga/hostgroup.h"
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#include "base/dynamictype.h"
#include "base/logger_fwd.h"
#include "base/objectlock.h"
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#include "base/utility.h"
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#include "base/timer.h"
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#include <boost/smart_ptr/make_shared.hpp>
#include <boost/foreach.hpp>
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using namespace icinga;
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static boost::mutex l_Mutex;
static std::map<String, std::vector<Host::WeakPtr> > l_MembersCache;
static bool l_MembersCacheNeedsUpdate = false;
static Timer::Ptr l_MembersCacheTimer;
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REGISTER_TYPE(HostGroup);
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HostGroup::HostGroup(const Dictionary::Ptr& serializedUpdate)
: DynamicObject(serializedUpdate)
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{
RegisterAttribute("display_name", Attribute_Config, &m_DisplayName);
}
HostGroup::~HostGroup(void)
{
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InvalidateMembersCache();
}
void HostGroup::OnRegistrationCompleted(void)
{
ASSERT(!OwnsLock());
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InvalidateMembersCache();
}
String HostGroup::GetDisplayName(void) const
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{
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if (!m_DisplayName.IsEmpty())
return m_DisplayName;
else
return GetName();
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}
HostGroup::Ptr HostGroup::GetByName(const String& name)
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{
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DynamicObject::Ptr configObject = DynamicObject::GetObject("HostGroup", name);
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if (!configObject)
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BOOST_THROW_EXCEPTION(std::invalid_argument("HostGroup '" + name + "' does not exist."));
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return dynamic_pointer_cast<HostGroup>(configObject);
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}
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std::set<Host::Ptr> HostGroup::GetMembers(void) const
{
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std::set<Host::Ptr> hosts;
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{
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boost::mutex::scoped_lock lock(l_Mutex);
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BOOST_FOREACH(const Host::WeakPtr& whost, l_MembersCache[GetName()]) {
Host::Ptr host = whost.lock();
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if (!host)
continue;
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hosts.insert(host);
}
}
return hosts;
}
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void HostGroup::InvalidateMembersCache(void)
{
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boost::mutex::scoped_lock lock(l_Mutex);
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if (l_MembersCacheNeedsUpdate)
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return; /* Someone else has already requested a refresh. */
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if (!l_MembersCacheTimer) {
l_MembersCacheTimer = boost::make_shared<Timer>();
l_MembersCacheTimer->SetInterval(0.5);
l_MembersCacheTimer->OnTimerExpired.connect(boost::bind(&HostGroup::RefreshMembersCache));
l_MembersCacheTimer->Start();
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}
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l_MembersCacheNeedsUpdate = true;
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}
void HostGroup::RefreshMembersCache(void)
{
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{
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boost::mutex::scoped_lock lock(l_Mutex);
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if (!l_MembersCacheNeedsUpdate)
return;
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l_MembersCacheNeedsUpdate = false;
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}
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Log(LogDebug, "icinga", "Updating HostGroup members cache.");
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std::map<String, std::vector<Host::WeakPtr> > newMembersCache;
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BOOST_FOREACH(const DynamicObject::Ptr& object, DynamicType::GetObjects("Host")) {
const Host::Ptr& host = static_pointer_cast<Host>(object);
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Array::Ptr groups;
groups = host->GetGroups();
if (groups) {
ObjectLock mlock(groups);
BOOST_FOREACH(const Value& group, groups) {
newMembersCache[group].push_back(host);
}
}
}
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boost::mutex::scoped_lock lock(l_Mutex);
l_MembersCache.swap(newMembersCache);
}