| 1 | /* |
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| 2 | SPDX-FileCopyrightText: 2010 Grégory Oestreicher <greg@kamago.net> |
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| 3 | |
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| 4 | SPDX-License-Identifier: LGPL-2.0-or-later |
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| 5 | */ |
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| 6 | |
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| 7 | #ifndef KDAV_ETAGCACHE_H |
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| 8 | #define KDAV_ETAGCACHE_H |
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| 9 | |
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| 10 | #include "kdav_export.h" |
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| 11 | |
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| 12 | #include <QObject> |
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| 13 | #include <QStringList> |
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| 14 | |
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| 15 | #include <memory> |
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| 16 | |
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| 17 | namespace KDAV |
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| 18 | { |
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| 19 | class EtagCachePrivate; |
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| 20 | |
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| 21 | /*! |
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| 22 | * \class KDAV::EtagCache |
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| 23 | * \inheaderfile KDAV/EtagCache |
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| 24 | * \inmodule KDAV |
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| 25 | * |
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| 26 | * \brief A helper class to cache ETags. |
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| 27 | * |
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| 28 | * The EtagCache caches the remote ids and ETags of all items |
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| 29 | * in a given collection. This cache is needed to find |
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| 30 | * out which items have been changed in the backend and have to |
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| 31 | * be refetched on the next call of Akonadi::ResourceBase::retrieveItems() |
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| 32 | */ |
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| 33 | class KDAV_EXPORT EtagCache : public QObject |
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| 34 | { |
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| 35 | Q_OBJECT |
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| 36 | |
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| 37 | public: |
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| 38 | /*! |
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| 39 | * Creates a new ETag cache. |
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| 40 | */ |
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| 41 | explicit EtagCache(QObject *parent = nullptr); |
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| 42 | ~EtagCache() override; |
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| 43 | |
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| 44 | /*! |
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| 45 | * Sets the ETag for the remote ID. If the remote ID is marked as |
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| 46 | * changed (is contained in the return of changedRemoteIds), remove |
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| 47 | * it from the changed list. |
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| 48 | */ |
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| 49 | void setEtag(const QString &remoteId, const QString &etag); |
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| 50 | |
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| 51 | /*! |
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| 52 | * Checks if the given item is in the cache |
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| 53 | */ |
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| 54 | Q_REQUIRED_RESULT bool contains(const QString &remoteId) const; |
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| 55 | |
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| 56 | /*! |
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| 57 | * Check if the known ETag for the remote ID is equal to \a refEtag. |
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| 58 | */ |
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| 59 | Q_REQUIRED_RESULT bool etagChanged(const QString &remoteId, const QString &refEtag) const; |
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| 60 | |
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| 61 | /*! |
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| 62 | * Mark an item as changed in the backend. |
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| 63 | */ |
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| 64 | void markAsChanged(const QString &remoteId); |
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| 65 | |
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| 66 | /*! |
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| 67 | * Returns true if the remote ID is marked as changed (is contained in the |
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| 68 | * return of changedRemoteIds) |
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| 69 | */ |
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| 70 | Q_REQUIRED_RESULT bool isOutOfDate(const QString &remoteId) const; |
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| 71 | |
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| 72 | /*! |
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| 73 | * Removes the entry for item with remote ID \a remoteId. |
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| 74 | */ |
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| 75 | void removeEtag(const QString &remoteId); |
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| 76 | |
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| 77 | /*! |
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| 78 | * Returns the list of all items URLs. |
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| 79 | */ |
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| 80 | Q_REQUIRED_RESULT QStringList urls() const; |
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| 81 | |
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| 82 | /*! |
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| 83 | * Returns the list of remote ids of items that have been changed |
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| 84 | * in the backend. |
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| 85 | */ |
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| 86 | Q_REQUIRED_RESULT QStringList changedRemoteIds() const; |
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| 87 | |
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| 88 | protected: |
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| 89 | /*! |
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| 90 | * Sets the ETag for the remote ID. |
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| 91 | */ |
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| 92 | void setEtagInternal(const QString &remoteId, const QString &etag); |
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| 93 | |
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| 94 | private: |
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| 95 | const std::unique_ptr<EtagCachePrivate> d; |
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| 96 | |
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| 97 | friend class DavItemsListJobPrivate; |
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| 98 | // @internal |
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| 99 | // Returns a map of remote Id and corresponding etag string key/value pairs. |
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| 100 | // Only used by DavItemsListJobPrivate |
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| 101 | Q_DECL_HIDDEN QMap<QString, QString> etagCacheMap() const; |
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| 102 | }; |
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| 103 | } |
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| 104 | |
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| 105 | #endif |
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| 106 | |
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