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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
#include <Ice/Ice.h>
#include <IceGrid/ReapThread.h>
using namespace std;
using namespace IceGrid;
ReapThread::ReapThread() :
_closeCallback([this](const auto& con) { connectionClosed(con); }),
_heartbeatCallback([this](const auto& con) { connectionHeartbeat(con); }),
_terminated(false),
_thread([this] { run(); })
{
}
void
ReapThread::run()
{
vector<ReapableItem> reap;
while(true)
{
{
unique_lock lock(_mutex);
if(_terminated)
{
break;
}
calcWakeInterval();
//
// If the wake interval is zero then we wait forever.
//
if(_wakeInterval == 0s)
{
_condVar.wait(lock);
}
else
{
_condVar.wait_for(lock, _wakeInterval);
}
if(_terminated)
{
break;
}
auto p = _sessions.begin();
while(p != _sessions.end())
{
try
{
if(p->timeout == 0s)
{
p->item->timestamp(); // This should throw if the reapable is destroyed.
++p;
continue;
}
else if((chrono::steady_clock::now() - p->item->timestamp()) > p->timeout)
{
reap.push_back(*p);
}
else
{
++p;
continue;
}
}
catch(const Ice::ObjectNotExistException&)
{
}
//
// Remove the reapable
//
if(p->connection)
{
auto q = _connections.find(p->connection);
if(q != _connections.end())
{
q->second.erase(p->item);
if(q->second.empty())
{
p->connection->setCloseCallback(nullptr);
p->connection->setHeartbeatCallback(nullptr);
_connections.erase(q);
}
}
}
p = _sessions.erase(p);
}
}
for(const auto& r : reap)
{
r.item->destroy(false);
}
reap.clear();
}
}
void
ReapThread::terminate()
{
list<ReapableItem> reap;
{
lock_guard lock(_mutex);
if(_terminated)
{
assert(_sessions.empty());
return;
}
_terminated = true;
_condVar.notify_one();
reap.swap(_sessions);
for(const auto& conn : _connections)
{
conn.first->setCloseCallback(nullptr);
conn.first->setHeartbeatCallback(nullptr);
}
_connections.clear();
_closeCallback = nullptr;
_heartbeatCallback = nullptr;
}
for(const auto& r : reap)
{
r.item->destroy(true);
}
}
void
ReapThread::join()
{
_thread.join();
}
void
ReapThread::add(const shared_ptr<Reapable>& reapable, chrono::seconds timeout,
const shared_ptr<Ice::Connection>& connection)
{
lock_guard lock(_mutex);
if(_terminated)
{
return;
}
//
// NOTE: registering a reapable with a null timeout is allowed. The reapable is reaped
// only when the reaper thread is shutdown.
//
//
// 10 seconds is the minimum permissable timeout.
//
if(timeout > 0s && timeout < 10s)
{
timeout = 10s;
}
_sessions.push_back({ reapable, connection, timeout });
if(connection)
{
auto p = _connections.find(connection);
if(p == _connections.end())
{
p = _connections.insert({connection, {} }).first;
connection->setCloseCallback(_closeCallback);
connection->setHeartbeatCallback(_heartbeatCallback);
}
p->second.insert(reapable);
}
if(timeout > 0s)
{
//
// If there is a new minimum wake interval then wake the reaping
// thread.
//
if(calcWakeInterval())
{
_condVar.notify_one();
}
//
// Since we just added a new session with a non null timeout there
// must be a non-zero wakeInterval.
//
assert(_wakeInterval != 0s);
}
}
void
ReapThread::connectionHeartbeat(const shared_ptr<Ice::Connection>& con)
{
lock_guard lock(_mutex);
auto p = _connections.find(con);
if(p == _connections.end())
{
con->setCloseCallback(nullptr);
con->setHeartbeatCallback(nullptr);
return;
}
for(const auto& reapable : p->second)
{
reapable->heartbeat();
}
}
void
ReapThread::connectionClosed(const shared_ptr<Ice::Connection>& con)
{
lock_guard lock(_mutex);
auto p = _connections.find(con);
if(p == _connections.end())
{
con->setCloseCallback(nullptr);
con->setHeartbeatCallback(nullptr);
return;
}
for(const auto& reapable : p->second)
{
reapable->destroy(false);
}
_connections.erase(p);
}
//
// Returns true if the calculated wake interval is less than the current wake
// interval (or if the original wake interval was "forever").
//
bool
ReapThread::calcWakeInterval()
{
// Re-calculate minimum timeout
auto oldWakeInterval = _wakeInterval;
chrono::milliseconds minimum = 0s;
bool first = true;
for(const auto& session : _sessions)
{
if(session.timeout != 0s && (first || session.timeout < minimum))
{
minimum = session.timeout;
first = false;
}
}
_wakeInterval = minimum;
return oldWakeInterval == 0s || minimum < oldWakeInterval;
}
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