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Use HttpMetaCache to minimize network use.

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This commit is contained in:
Petr Mrázek 2013-09-08 02:15:20 +02:00
parent 6892c11e9f
commit 6bea4ec988
17 changed files with 698 additions and 274 deletions
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33
logic/net/HttpMetaCache.h
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@ -2,6 +2,7 @@
#include <QString>
#include <QSharedPointer>
#include <QMap>
#include <qtimer.h>
struct MetaEntry
{
@ -9,23 +10,42 @@ struct MetaEntry
QString path;
QString md5sum;
QString etag;
quint64 last_changed_timestamp = 0;
qint64 last_changed_timestamp = 0;
bool stale = true;
QString getFullPath();
};
typedef QSharedPointer<MetaEntry> MetaEntryPtr;
class HttpMetaCache
class HttpMetaCache : public QObject
{
Q_OBJECT
public:
// supply path to the cache index file
HttpMetaCache(QString path);
~HttpMetaCache();
MetaEntryPtr getEntryForResource(QString base, QString resource_path);
void addEntry(QString base, QString resource_path, QString etag);
// get the entry solely from the cache
// you probably don't want this, unless you have some specific caching needs.
MetaEntryPtr getEntry(QString base, QString resource_path);
// get the entry from cache and verify that it isn't stale (within reason)
MetaEntryPtr resolveEntry(QString base, QString resource_path, QString expected_etag = QString());
// add a previously resolved stale entry
bool updateEntry(MetaEntryPtr stale_entry);
void addBase(QString base, QString base_root);
private:
void Save();
// (re)start a timer that calls SaveNow later.
void SaveEventually();
void Load();
QString getBasePath ( QString base );
public slots:
void SaveNow();
private:
// create a new stale entry, given the parameters
MetaEntryPtr staleEntry(QString base, QString resource_path);
struct EntryMap
{
QString base_path;
@ -33,4 +53,5 @@ private:
};
QMap<QString, EntryMap> m_entries;
QString m_index_file;
QTimer saveBatchingTimer;
};