124 lines
3.1 KiB
C++
124 lines
3.1 KiB
C++
/* Copyright 2013-2021 MultiMC Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <QString>
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#include <QMap>
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#include <qtimer.h>
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#include <memory>
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class HttpMetaCache;
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class MetaEntry
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{
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friend class HttpMetaCache;
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protected:
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MetaEntry() {}
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public:
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bool isStale()
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{
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return stale;
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}
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void setStale(bool stale)
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{
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this->stale = stale;
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}
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QString getFullPath();
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QString getRemoteChangedTimestamp()
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{
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return remote_changed_timestamp;
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}
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void setRemoteChangedTimestamp(QString remote_changed_timestamp)
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{
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this->remote_changed_timestamp = remote_changed_timestamp;
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}
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void setLocalChangedTimestamp(qint64 timestamp)
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{
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local_changed_timestamp = timestamp;
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}
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QString getETag()
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{
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return etag;
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}
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void setETag(QString etag)
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{
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this->etag = etag;
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}
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QString getMD5Sum()
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{
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return md5sum;
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}
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void setMD5Sum(QString md5sum)
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{
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this->md5sum = md5sum;
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}
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protected:
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QString baseId;
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QString basePath;
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QString relativePath;
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QString md5sum;
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QString etag;
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qint64 local_changed_timestamp = 0;
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QString remote_changed_timestamp; // QString for now, RFC 2822 encoded time
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bool stale = true;
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};
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typedef std::shared_ptr<MetaEntry> MetaEntryPtr;
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class HttpMetaCache : public QObject
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{
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Q_OBJECT
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public:
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// supply path to the cache index file
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HttpMetaCache(QString path = QString());
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~HttpMetaCache();
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// get the entry solely from the cache
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// you probably don't want this, unless you have some specific caching needs.
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MetaEntryPtr getEntry(QString base, QString resource_path);
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// get the entry from cache and verify that it isn't stale (within reason)
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MetaEntryPtr resolveEntry(QString base, QString resource_path,
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QString expected_etag = QString());
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// add a previously resolved stale entry
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bool updateEntry(MetaEntryPtr stale_entry);
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// evict selected entry from cache
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bool evictEntry(MetaEntryPtr entry);
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void addBase(QString base, QString base_root);
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// (re)start a timer that calls SaveNow later.
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void SaveEventually();
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void Load();
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QString getBasePath(QString base);
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public
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slots:
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void SaveNow();
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private:
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// create a new stale entry, given the parameters
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MetaEntryPtr staleEntry(QString base, QString resource_path);
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struct EntryMap
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{
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QString base_path;
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QMap<QString, MetaEntryPtr> entry_list;
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};
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QMap<QString, EntryMap> m_entries;
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QString m_index_file;
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QTimer saveBatchingTimer;
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};
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