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refs #623 Fixed CDataPageQueue performance.

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This commit is contained in:
Mathew Sutcliffe
2016-03-19 19:41:33 +00:00
parent 6f3faa5d7e
commit 6b1b599275
2 changed files with 14 additions and 17 deletions
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27
src/blackmisc/datacache.cpp
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@@ -161,31 +161,28 @@ namespace BlackMisc
auto *queue = new CDataPageQueue(page); auto *queue = new CDataPageQueue(page);
connect(page, &CValuePage::valuesWantToCache, this, &CDataCache::changeValues); connect(page, &CValuePage::valuesWantToCache, this, &CDataCache::changeValues);
connect(this, &CDataCache::valuesChanged, queue, &CDataPageQueue::queueValuesFromCache, Qt::DirectConnection); connect(this, &CDataCache::valuesChanged, queue, &CDataPageQueue::queueValuesFromCache, Qt::DirectConnection);
auto *timer = new QTimer(page);
connect(timer, &QTimer::timeout, queue, &CDataPageQueue::trySetQueuedValuesFromCache);
timer->start(0);
} }
void CDataPageQueue::queueValuesFromCache(const CValueCachePacket &values, QObject *changedBy) void CDataPageQueue::queueValuesFromCache(const CValueCachePacket &values, QObject *changedBy)
{ {
QMutexLocker lock(&m_mutex); QMutexLocker lock(&m_mutex);
if (m_queue.isEmpty())
{
QTimer::singleShot(0, this, &CDataPageQueue::setQueuedValuesFromCache);
}
m_queue.push_back(std::make_pair(values, changedBy)); m_queue.push_back(std::make_pair(values, changedBy));
} }
void CDataPageQueue::trySetQueuedValuesFromCache() void CDataPageQueue::setQueuedValuesFromCache()
{ {
bool locked = m_mutex.tryLock(0); QMutexLocker lock(&m_mutex);
if (locked) decltype(m_queue) queue;
{ qSwap(m_queue, queue);
decltype(m_queue) queue; lock.unlock();
qSwap(m_queue, queue);
m_mutex.unlock();
for (const auto &pair : queue) for (const auto &pair : queue)
{ {
m_page->setValuesFromCache(pair.first, pair.second); m_page->setValuesFromCache(pair.first, pair.second);
}
} }
} }

4
src/blackmisc/datacache.h
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@@ -40,8 +40,8 @@ namespace BlackMisc
//! \threadsafe //! \threadsafe
void queueValuesFromCache(const BlackMisc::CValueCachePacket &values, QObject *changedBy); void queueValuesFromCache(const BlackMisc::CValueCachePacket &values, QObject *changedBy);
//! Synchronize with changes queued by queueValuesFromCache, if the mutex is not currently locked. //! Synchronize with changes queued by queueValuesFromCache.
void trySetQueuedValuesFromCache(); void setQueuedValuesFromCache();
//! Synchronize with one specific change in the queue, leave the rest for later. //! Synchronize with one specific change in the queue, leave the rest for later.
void setQueuedValueFromCache(const QString &key); void setQueuedValueFromCache(const QString &key);