mirror of
https://github.com/swift-project/pilotclient.git
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601 lines
21 KiB
C++
601 lines
21 KiB
C++
/* Copyright (C) 2015
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* swift project Community / Contributors
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*
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* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
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* directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
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* including this file, may be copied, modified, propagated, or distributed except according to the terms
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* contained in the LICENSE file.
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*/
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//! \cond PRIVATE
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#include "blackmisc/valuecache.h"
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#include "blackmisc/identifier.h"
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#include "blackmisc/logmessage.h"
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#include "blackmisc/algorithm.h"
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#include "blackmisc/lockfree.h"
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#include "blackmisc/atomicfile.h"
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#include <QThread>
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#include <QJsonDocument>
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#include <QDir>
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namespace BlackMisc
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{
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using Private::CValuePage;
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//! Used in asserts to protect against signed integer overflow.
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template <typename T>
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bool isSafeToIncrement(const T &value) { return value < std::numeric_limits<T>::max(); }
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////////////////////////////////
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// CValueCachePacket
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////////////////////////////////
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CValueCachePacket::CValueCachePacket(const CVariantMap &values, qint64 timestamp, bool saved) :
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m_saved(saved)
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{
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for (auto it = values.cbegin(); it != values.cend(); ++it)
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{
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implementationOf(*this).insert(CDictionary::cend(), it.key(), std::make_pair(it.value(), timestamp));
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}
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}
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void CValueCachePacket::insert(const QString &key, const CVariant &value, qint64 timestamp)
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{
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CDictionary::insert(key, std::make_pair(value, timestamp));
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}
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void CValueCachePacket::insert(const CVariantMap &values, qint64 timestamp)
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{
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for (auto it = values.cbegin(); it != values.cend(); ++it)
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{
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CDictionary::insert(it.key(), std::make_pair(it.value(), timestamp));
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}
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}
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CVariantMap CValueCachePacket::toVariantMap() const
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{
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CVariantMap result;
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for (auto it = cbegin(); it != cend(); ++it)
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{
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implementationOf(result).insert(result.cend(), it.key(), it.value());
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}
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return result;
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}
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QMap<QString, qint64> CValueCachePacket::toTimestampMap() const
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{
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QMap<QString, qint64> result;
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for (auto it = cbegin(); it != cend(); ++it)
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{
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implementationOf(result).insert(result.cend(), it.key(), it.timestamp());
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}
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return result;
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}
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CValueCachePacket CValueCachePacket::takeByKey(const QString &key)
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{
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auto copy = *this;
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remove(key);
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copy.removeByKeyIf([ = ](const QString &key2) { return key2 != key; });
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return copy;
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}
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void CValueCachePacket::registerMetadata()
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{
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MetaType::registerMetadata();
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qDBusRegisterMetaType<value_type>();
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}
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////////////////////////////////
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// CValueCache
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////////////////////////////////
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const CLogCategoryList &CValueCache::getLogCategories()
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{
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static const CLogCategoryList cats({ CLogCategory("swift.valuecache") , CLogCategory::services()} );
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return cats;
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}
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CValueCache::CValueCache(CValueCache::DistributionMode mode, QObject *parent) :
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QObject(parent)
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{
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if (mode == LocalOnly)
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{
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// loopback signal to own slot for local operation
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connect(this, &CValueCache::valuesChangedByLocal, this, [ = ](const CValueCachePacket & values)
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{
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changeValuesFromRemote(values, CIdentifier());
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});
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}
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}
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struct CValueCache::Element
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{
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Element(const QString &key) : m_key(key) {}
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const QString m_key;
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CVariant m_value;
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int m_pendingChanges = 0;
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bool m_saved = false;
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std::atomic<qint64> m_timestamp { 0 };
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};
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CValueCache::Element &CValueCache::getElement(const QString &key)
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{
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QMutexLocker lock(&m_mutex);
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return getElement(key, m_elements.lowerBound(key));
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}
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CValueCache::Element &CValueCache::getElement(const QString &key, QMap<QString, ElementPtr>::const_iterator pos)
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{
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QMutexLocker lock(&m_mutex);
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if (pos != m_elements.end() && pos.key() == key) { return **pos; }
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Q_ASSERT(pos == m_elements.lowerBound(key));
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return **m_elements.insert(pos, key, ElementPtr(new Element(key)));
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}
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std::tuple<CVariant, qint64, bool> CValueCache::getValue(const QString &key)
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{
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QMutexLocker lock(&m_mutex);
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const auto &element = getElement(key);
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return std::make_tuple(element.m_value, element.m_timestamp.load(), element.m_saved);
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}
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CVariantMap CValueCache::getAllValues(const QString &keyPrefix) const
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{
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QMutexLocker lock(&m_mutex);
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CVariantMap map;
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for (const auto &element : elementsStartingWith(keyPrefix))
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{
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implementationOf(map).insert(map.cend(), element->m_key, element->m_value);
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}
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return map;
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}
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CValueCachePacket CValueCache::getAllValuesWithTimestamps(const QString &keyPrefix) const
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{
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QMutexLocker lock(&m_mutex);
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CValueCachePacket map;
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for (const auto &element : elementsStartingWith(keyPrefix))
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{
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map.insert(element->m_key, element->m_value, element->m_timestamp);
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}
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return map;
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}
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void CValueCache::insertValues(const CValueCachePacket &values)
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{
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QMutexLocker lock(&m_mutex);
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changeValues(values);
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}
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void CValueCache::changeValues(const CValueCachePacket &values)
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{
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QMutexLocker lock(&m_mutex);
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if (values.empty()) { return; }
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auto out = m_elements.lowerBound(values.cbegin().key());
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auto end = m_elements.upperBound((values.cend() - 1).key());
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for (auto in = values.cbegin(); in != values.cend(); ++in)
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{
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while (out != end && out.key() < in.key()) { ++out; }
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auto &element = getElement(in.key(), out);
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Q_ASSERT(isSafeToIncrement(element.m_pendingChanges));
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element.m_pendingChanges++;
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element.m_value = in.value();
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element.m_timestamp = in.timestamp();
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element.m_saved = values.isSaved();
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}
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emit valuesChanged(values, sender());
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emit valuesChangedByLocal(values);
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}
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void CValueCache::changeValuesFromRemote(const CValueCachePacket &values, const CIdentifier &originator)
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{
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QMutexLocker lock(&m_mutex);
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if (values.empty()) { return; }
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CValueCachePacket ratifiedChanges(values.isSaved());
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auto out = m_elements.lowerBound(values.cbegin().key());
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auto end = m_elements.upperBound((values.cend() - 1).key());
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for (auto in = values.cbegin(); in != values.cend(); ++in)
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{
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while (out != end && out.key() < in.key()) { ++out; }
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auto &element = getElement(in.key(), out);
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if (originator.isFromSameProcess()) // round trip
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{
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element.m_pendingChanges--;
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Q_ASSERT(element.m_pendingChanges >= 0);
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}
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else if (element.m_pendingChanges == 0) // ratify a change only if own change is not pending, to ensure consistency
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{
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element.m_value = in.value();
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element.m_timestamp = in.timestamp();
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element.m_saved = values.isSaved();
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ratifiedChanges.insert(in.key(), in.value(), in.timestamp());
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}
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}
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if (! ratifiedChanges.empty())
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{
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if (ratifiedChanges.isSaved()) { emit valuesSaveRequested(ratifiedChanges); }
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emit valuesChanged(ratifiedChanges, nullptr);
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}
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}
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QJsonObject CValueCache::saveToJson(const QString &keyPrefix) const
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{
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return getAllValues(keyPrefix).toJson();
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}
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void CValueCache::loadFromJson(const QJsonObject &json)
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{
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CVariantMap map;
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map.convertFromJson(json);
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insertValues({ map, QDateTime::currentMSecsSinceEpoch() });
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}
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CStatusMessage CValueCache::saveToFiles(const QString &dir, const QString &keyPrefix)
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{
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QMutexLocker lock(&m_mutex);
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auto values = getAllValues(keyPrefix);
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auto status = saveToFiles(dir, values);
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if (status.isSuccess()) { markAllAsSaved(keyPrefix); }
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return status;
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}
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CStatusMessage CValueCache::saveToFiles(const QString &dir, const CVariantMap &values) const
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{
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QMap<QString, CVariantMap> namespaces;
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for (auto it = values.cbegin(); it != values.cend(); ++it)
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{
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namespaces[it.key().section('/', 0, 0)].insert(it.key(), it.value());
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}
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if (! QDir::root().mkpath(dir))
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{
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return CStatusMessage(this, CStatusMessage::SeverityError, "Failed to create directory " + dir);
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}
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for (auto it = namespaces.cbegin(); it != namespaces.cend(); ++it)
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{
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CAtomicFile file(dir + "/" + it.key() + ".json");
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if (! file.open(QFile::ReadWrite | QFile::Text))
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{
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return CStatusMessage(this, CStatusMessage::SeverityError, QString("Failed to open %1: %2").arg(file.fileName()).arg(file.errorString()));
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}
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auto json = QJsonDocument::fromJson(file.readAll());
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if (json.isArray() || (json.isNull() && ! json.isEmpty()))
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{
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return CStatusMessage(this, CStatusMessage::SeverityError, "Invalid JSON format in " + file.fileName());
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}
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CVariantMap storedValues;
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storedValues.convertFromJson(json.object());
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storedValues.insert(*it);
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json.setObject(storedValues.toJson());
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if (!(file.seek(0) && file.resize(0) && file.write(json.toJson()) > 0 && file.checkedClose()))
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{
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return CStatusMessage(this, CStatusMessage::SeverityError,
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QString("Failed to write to %1: %2").arg(file.fileName()).arg(file.errorString()));
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}
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}
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return CStatusMessage(this, CStatusMessage::SeverityInfo,
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QString("Written %1 files for value cache in %2").arg(namespaces.size()).arg(dir));
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}
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CStatusMessage CValueCache::loadFromFiles(const QString &dir)
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{
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QMutexLocker lock(&m_mutex);
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CValueCachePacket values;
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auto status = loadFromFiles(dir, {}, getAllValues(), values);
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values.setSaved();
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insertValues(values);
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return status;
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}
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CStatusMessage CValueCache::loadFromFiles(const QString &dir, const QSet<QString> &keys, const CVariantMap ¤tValues, CValueCachePacket &o_values) const
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{
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if (! QDir(dir).isReadable())
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{
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return CStatusMessage(this, CStatusMessage::SeverityError, "Failed to create directory " + dir);
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}
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const QStringList entries(QDir(dir).entryList({ "*.json" }, QDir::Files));
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for (const auto &filename : entries)
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{
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QFile file(dir + "/" + filename);
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if (! file.open(QFile::ReadOnly | QFile::Text))
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{
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return CStatusMessage(this, CStatusMessage::SeverityError, QString("Failed to open %1: %2").arg(file.fileName()).arg(file.errorString()));
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}
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auto json = QJsonDocument::fromJson(file.readAll());
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if (json.isArray() || (json.isNull() && ! json.isEmpty()))
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{
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return CStatusMessage(this, CStatusMessage::SeverityError, "Invalid JSON format in " + file.fileName());
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}
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CVariantMap temp;
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temp.convertFromJson(json.object());
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if (! keys.isEmpty())
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{
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temp.removeByKeyIf([&keys](const QString & key) { return ! keys.contains(key); }); // TODO optimize by skipping files
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}
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temp.removeDuplicates(currentValues);
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o_values.insert(temp, QFileInfo(file).lastModified().toMSecsSinceEpoch());
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}
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return CStatusMessage(this, CStatusMessage::SeverityInfo,
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QString("Loaded value cache from %1 files in %2").arg(entries.size()).arg(dir));
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}
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void CValueCache::markAllAsSaved(const QString &keyPrefix)
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{
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QMutexLocker lock(&m_mutex);
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for (const auto &element : elementsStartingWith(keyPrefix))
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{
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element->m_saved = true;
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}
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}
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QString CValueCache::filenameForKey(const QString &key)
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{
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return key.section('/', 0, 0) + ".json";
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}
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QStringList CValueCache::enumerateFiles(const QString &dir) const
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{
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auto values = getAllValues();
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QSet<QString> files;
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for (auto it = values.begin(); it != values.end(); ++it) { files.insert(dir + "/" + filenameForKey(it.key())); }
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return files.toList();
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}
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void CValueCache::clearAllValues(const QString &keyPrefix)
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{
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QMutexLocker lock(&m_mutex);
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auto values = getAllValues(keyPrefix);
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for (auto it = values.begin(); it != values.end(); ++it) { it.value() = CVariant(); }
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changeValues({ values, 0 });
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}
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CValueCache::BatchGuard CValueCache::batchChanges(QObject *owner)
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{
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Q_ASSERT(QThread::currentThread() == owner->thread());
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auto &page = CValuePage::getPageFor(owner, this);
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page.beginBatch();
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return page;
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}
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CValueCache::BatchGuard::~BatchGuard() Q_DECL_NOEXCEPT
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{
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if (m_page)
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{
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if (std::uncaught_exception()) { m_page->abandonBatch(); }
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else { m_page->endBatch(); }
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}
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}
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void CValueCache::connectPage(CValuePage *page)
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{
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connect(page, &CValuePage::valuesWantToCache, this, &CValueCache::changeValues);
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connect(this, &CValueCache::valuesChanged, page, &CValuePage::setValuesFromCache);
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}
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////////////////////////////////
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// Private :: CValuePage
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////////////////////////////////
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CValuePage::CValuePage(QObject *parent, CValueCache *cache) :
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QObject(parent),
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m_cache(cache)
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{
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m_cache->connectPage(this);
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}
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CValuePage &CValuePage::getPageFor(QObject *parent, CValueCache *cache)
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{
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auto pages = parent->findChildren<CValuePage *>("", Qt::FindDirectChildrenOnly);
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auto it = std::find_if(pages.cbegin(), pages.cend(), [cache](CValuePage * page) { return page->m_cache == cache; });
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if (it == pages.cend()) { return *new CValuePage(parent, cache); }
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else { return **it; }
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}
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struct CValuePage::Element
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{
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Element(const QString &key, int metaType, Validator validator, const CVariant &defaultValue, NotifySlot slot) :
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m_key(key), m_metaType(metaType), m_validator(validator), m_default(defaultValue), m_notifySlot(slot)
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{}
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const QString m_key;
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LockFree<CVariant> m_value;
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std::atomic<qint64> m_timestamp { 0 };
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const int m_metaType = QMetaType::UnknownType;
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const Validator m_validator;
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const CVariant m_default;
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const NotifySlot m_notifySlot = nullptr;
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int m_pendingChanges = 0;
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bool m_saved = false;
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};
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CValuePage::Element &CValuePage::createElement(const QString &key, int metaType, Validator validator, const CVariant &defaultValue, NotifySlot slot)
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{
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Q_ASSERT_X(! m_elements.contains(key), "CValuePage", "Can't have two CCached in the same object referring to the same value");
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Q_ASSERT_X(defaultValue.isValid() ? defaultValue.userType() == metaType : true, "CValuePage", "Metatype mismatch for default value");
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Q_ASSERT_X(defaultValue.isValid() && validator ? validator(defaultValue) : true, "CValuePage", "Validator rejects default value");
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auto &element = *(m_elements[key] = ElementPtr(new Element(key, metaType, validator, defaultValue, slot)));
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std::forward_as_tuple(element.m_value.uniqueWrite(), element.m_timestamp, element.m_saved) = m_cache->getValue(key);
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auto status = validate(element, element.m_value.read(), CStatusMessage::SeverityDebug);
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if (!status.isEmpty()) // intentionally kept !empty here, debug message supposed to write default value
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{
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element.m_value.uniqueWrite() = defaultValue;
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CLogMessage::preformatted(status);
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}
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return element;
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}
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bool CValuePage::isValid(const Element &element, int typeId) const
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{
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auto reader = element.m_value.read();
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return reader->isValid() && reader->userType() == typeId;
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}
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const CVariant &CValuePage::getValue(const Element &element) const
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{
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Q_ASSERT(QThread::currentThread() == thread());
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return element.m_value.read();
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}
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CVariant CValuePage::getValueCopy(const Element &element) const
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{
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return element.m_value.read();
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}
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CStatusMessage CValuePage::setValue(Element &element, const CVariant &value, qint64 timestamp, bool save)
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{
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Q_ASSERT(QThread::currentThread() == thread());
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if (timestamp == 0) { timestamp = QDateTime::currentMSecsSinceEpoch(); }
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if (element.m_value.read() == value && element.m_timestamp == timestamp) { return {}; }
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auto status = validate(element, value, CStatusMessage::SeverityError);
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if (status.isSuccess())
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{
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if (m_batchMode > 0)
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{
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m_batchedValues[element.m_key] = value;
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}
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else
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{
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Q_ASSERT(isSafeToIncrement(element.m_pendingChanges));
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element.m_pendingChanges++;
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element.m_saved = save;
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element.m_value.uniqueWrite() = value;
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emit valuesWantToCache({ { { element.m_key, value } }, timestamp, save });
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}
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}
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return status;
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}
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const QString &CValuePage::getKey(const Element &element) const
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{
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return element.m_key;
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}
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qint64 CValuePage::getTimestamp(const Element &element) const
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{
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return element.m_timestamp;
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}
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bool CValuePage::isSaved(const Element &element) const
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{
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return element.m_saved && ! element.m_pendingChanges;
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}
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|
|
bool CValuePage::isSaving(const Element &element) const
|
|
{
|
|
return element.m_saved && element.m_pendingChanges;
|
|
}
|
|
|
|
void CValuePage::setValuesFromCache(const CValueCachePacket &values, QObject *changedBy)
|
|
{
|
|
Q_ASSERT(QThread::currentThread() == thread());
|
|
|
|
QList<NotifySlot> notifySlots;
|
|
|
|
forEachIntersection(m_elements, values, [changedBy, this, ¬ifySlots, &values](const QString &, const ElementPtr & element, CValueCachePacket::const_iterator it)
|
|
{
|
|
if (changedBy == this) // round trip
|
|
{
|
|
element->m_pendingChanges--;
|
|
Q_ASSERT(element->m_pendingChanges >= 0);
|
|
}
|
|
else if (element->m_pendingChanges == 0) // ratify a change only if own change is not pending, to ensure consistency
|
|
{
|
|
auto error = validate(*element, it.value(), CStatusMessage::SeverityError);
|
|
if (error.isSuccess())
|
|
{
|
|
element->m_value.uniqueWrite() = it.value();
|
|
element->m_timestamp = it.timestamp();
|
|
element->m_saved = values.isSaved();
|
|
if (element->m_notifySlot && ! notifySlots.contains(element->m_notifySlot))
|
|
{
|
|
notifySlots.push_back(element->m_notifySlot);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
CLogMessage::preformatted(error);
|
|
}
|
|
}
|
|
});
|
|
|
|
for (auto slot : notifySlots) { (parent()->*slot)(); }
|
|
}
|
|
|
|
void CValuePage::beginBatch()
|
|
{
|
|
Q_ASSERT(QThread::currentThread() == thread());
|
|
|
|
Q_ASSERT(isSafeToIncrement(m_batchMode));
|
|
if (m_batchMode <= 0) { m_batchedValues.clear(); }
|
|
m_batchMode++;
|
|
}
|
|
|
|
void CValuePage::abandonBatch()
|
|
{
|
|
Q_ASSERT(QThread::currentThread() == thread());
|
|
|
|
Q_ASSERT(m_batchMode >= 0);
|
|
m_batchMode--;
|
|
}
|
|
|
|
void CValuePage::endBatch()
|
|
{
|
|
Q_ASSERT(QThread::currentThread() == thread());
|
|
|
|
Q_ASSERT(m_batchMode >= 0);
|
|
m_batchMode--;
|
|
|
|
if (m_batchMode <= 0 && ! m_batchedValues.empty())
|
|
{
|
|
qint64 timestamp = QDateTime::currentMSecsSinceEpoch();
|
|
forEachIntersection(m_elements, m_batchedValues, [timestamp](const QString &, const ElementPtr & element, CVariantMap::const_iterator it)
|
|
{
|
|
Q_ASSERT(isSafeToIncrement(element->m_pendingChanges));
|
|
element->m_pendingChanges++;
|
|
element->m_value.uniqueWrite() = it.value();
|
|
element->m_timestamp = timestamp;
|
|
element->m_saved = false;
|
|
});
|
|
emit valuesWantToCache({ m_batchedValues, timestamp });
|
|
}
|
|
}
|
|
|
|
CStatusMessage CValuePage::validate(const Element &element, const CVariant &value, CStatusMessage::StatusSeverity invalidSeverity) const
|
|
{
|
|
if (! value.isValid())
|
|
{
|
|
return CStatusMessage(this, invalidSeverity, "Uninitialized value for " + element.m_key);
|
|
}
|
|
else if (value.userType() != element.m_metaType)
|
|
{
|
|
return CStatusMessage(this, CStatusMessage::SeverityError, QString("Expected ") + QMetaType::typeName(element.m_metaType) + " but got " + value.typeName() + " for " + element.m_key);
|
|
}
|
|
else if (element.m_validator && ! element.m_validator(value))
|
|
{
|
|
return CStatusMessage(this, CStatusMessage::SeverityError, value.toQString() + " is not valid for " + element.m_key);
|
|
}
|
|
else
|
|
{
|
|
return {};
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
//! \endcond
|