QRemoteObjectAbstractPersistedStore Class | Qt Remote Objects 5.12.9

- Qt 5.12
- Qt Remote Objects
- C++ Classes
- QRemoteObjectAbstractPersistedStore
- Qt 5.12.9 Reference Documentation

# QRemoteObjectAbstractPersistedStore Class

A class which provides the methods for setting PROP values of a replica to value they had the last time the replica was used. More...

Header: | #include <QRemoteObjectAbstractPersistedStore>
qmake: | QT += remoteobjects
Inherits: | QObject

- List of all members, including inherited members
- Obsolete members

## Public Functions

| QRemoteObjectAbstractPersistedStore(QObject *parent = nullptr)
virtual | ~QRemoteObjectAbstractPersistedStore()
virtual QVariantList | restoreProperties(const QString &repName, const QByteArray &repSig) = 0
virtual void | saveProperties(const QString &repName, const QByteArray &repSig, const QVariantList &values) = 0

- 31 public functions inherited from QObject

## Static Public Members

const QMetaObject | staticMetaObject

- 9 static public members inherited from QObject

## Protected Functions

| QRemoteObjectAbstractPersistedStore(QRemoteObjectAbstractPersistedStorePrivate &, QObject *parent)

- 9 protected functions inherited from QObject

### Additional Inherited Members

- 1 property inherited from QObject
- 1 public slot inherited from QObject
- 2 signals inherited from QObject

## Detailed Description

A class which provides the methods for setting PROP values of a replica to value they had the last time the replica was used.

This can be used to provide a "reasonable" value to be displayed until the connection to the source is established and current values are available.

This class must be overridden to provide an implementation for saving (QRemoteObjectAbstractPersistedStore::saveProperties) and restoring (QRemoteObjectAbstractPersistedStore::restoreProperties) PROP values. The derived type can then be set for a node, and any replica acquired from that node will then automatically store PERSISTED properties when the replica destructor is called, and retrieve the values when the replica is instantiated.

## Member Function Documentation

### QRemoteObjectAbstractPersistedStore::QRemoteObjectAbstractPersistedStore(QObject *parent = nullptr)

Constructs a QRemoteObjectAbstractPersistedStore with the given parent. The default value of parent is `nullptr`.

### `[protected]` QRemoteObjectAbstractPersistedStore::QRemoteObjectAbstractPersistedStore(QRemoteObjectAbstractPersistedStorePrivate &, QObject *parent)

Default constructs an instance of QRemoteObjectAbstractPersistedStore.

### `[virtual]` QRemoteObjectAbstractPersistedStore::~QRemoteObjectAbstractPersistedStore()

Destroys the instance of QRemoteObjectAbstractPersistedStore. The destructor is virtual.

### `[pure virtual]` QVariantList QRemoteObjectAbstractPersistedStore::restoreProperties(const QString &repName, const QByteArray &repSig)

This method will be provided the replica class's repName and repSig when the replica is being initialized. It is the responsibility of the inheriting class to get the last values persisted by QRemoteObjectAbstractPersistedStore::saveProperties and return them. An empty QVariantList should be returned if no values are available.

See also QRemoteObjectAbstractPersistedStore::saveProperties.

### `[pure virtual]` void QRemoteObjectAbstractPersistedStore::saveProperties(const QString &repName, const QByteArray &repSig, const QVariantList &values)

This method will be provided the replica class's repName, repSig and the list of values that PERSISTED properties have when the replica destructor was called. It is the responsibility of the inheriting class to store the information in a manner consistent for QRemoteObjectAbstractPersistedStore::restoreProperties to retrieve.

See also QRemoteObjectAbstractPersistedStore::restoreProperties.