class QRemoteObjectReplica

A class interacting with (but not implementing) a Qt API on the Remote Object network. More…

Inheritance diagram of PySide6.QtRemoteObjects.QRemoteObjectReplica

Inherited by: QRemoteObjectRegistry, QRemoteObjectDynamicReplica

Synopsis

Properties

  • nodeᅟ - A pointer to the node this object was acquired from

  • stateᅟ - Returns the replica state

Methods

Virtual methods

Signals

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description

A Remote Object Replica is a QObject proxy for another QObject (called the Source object). Once initialized, a replica can be considered a “latent copy” of the Source object. That is, every change to a Q_PROPERTY on the Source , or signal emitted by the Source will be updated/emitted by all Replica objects. Latency is introduced by process scheduling by any OSes involved and network communication latency. As long as the replica has been initialized and the communication is not disrupted, receipt and order of changes is guaranteed.

The isInitialized and state properties (and corresponding initialized() / stateChanged() signals) allow the state of a Replica to be determined.

While Qt Remote Objects (QtRO) handles the initialization and synchronization of Replica objects, there are numerous steps happening behind the scenes which can fail and that aren’t encountered in single process Qt applications. See Troubleshooting for advice on how to handle such issues when using a remote objects network.

class State

This enum type specifies the various state codes associated with QRemoteObjectReplica states:

Constant

Description

QRemoteObjectReplica.Uninitialized

Initial value of DynamicReplica, where nothing is known about the replica before connection to source.

QRemoteObjectReplica.Default

Initial value of static replica, where any defaults set in the .rep file are available so it can be used if necessary.

QRemoteObjectReplica.Valid

Indicates the replica is connected, has good property values and can be interacted with.

QRemoteObjectReplica.Suspect

Error state that occurs if the connection to the source is lost after it is initialized.

QRemoteObjectReplica.SignatureMismatch

Error state that occurs if a connection to the source is made, but the source and replica are not derived from the same .rep (only possible for static Replicas).

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property nodeᅟ: QRemoteObjectNode

This property holds A pointer to the node this object was acquired from..

Access functions:
property stateᅟ: QRemoteObjectReplica.State

This property holds Returns the replica state..

This property holds the replica State .

Access functions:
__init__()
initialize()
initializeNode(node[, name=""])
Parameters:
initialized()

This signal is emitted once the replica is initialized. An intialized replica has all property values set, but has not yet emitted any property change notifications.

isInitialized()
Return type:

bool

Returns true if this replica has been initialized with data from the Source object. Returns false otherwise.

See also

state()

isReplicaValid()
Return type:

bool

Returns true if this replica has been initialized and has a valid connection with the node hosting the Source . Returns false otherwise.

See also

isInitialized()

node()
Return type:

QRemoteObjectNode

See also

setNode()

Getter of property nodeᅟ .

notified()

This signal is emitted once the replica is initialized and all property change notifications have been emitted.

It is sometimes useful to respond to property changes as events. For example, you might want to display a user notification when a certain property change occurs. However, this user notification would then also be triggered when a replica first became QRemoteObjectReplica::Valid, as all property change signals are emitted at that time. This isn’t always desirable, and notified allows the developer to distinguish between these two cases.

persistProperties(repName, repSig, props)
Parameters:

  • repName – str

  • repSig – QByteArray

  • props – .list of QVariant

propAsVariant(i)
Parameters:

i – int

Return type:

object

retrieveProperties(repName, repSig)
Parameters:
Return type:

.list of QVariant

send(call, index, args)
Parameters:

  • call – Call

  • index – int

  • args – .list of QVariant

sendWithReply(call, index, args)
Parameters:

  • call – Call

  • index – int

  • args – .list of QVariant

Return type:

QRemoteObjectPendingCall

setChild(i, arg__2)
Parameters:

  • i – int

  • arg__2 – object

setNode(node)
Parameters:

node – QRemoteObjectNode

See also

node()

Setter of property nodeᅟ .

state()
Return type:

State

Returns the current state of the replica.

See also

isInitialized

Getter of property stateᅟ .

stateChanged(state, oldState)
Parameters:

This signal is emitted whenever a replica’s state toggles between State .

The change in state is represented with state and oldState.

Notification signal of property stateᅟ .

waitForSource([timeout=30000])
Parameters:

timeout – int

Return type:

bool

Blocking call that waits for the replica to become initialized or until the timeout (in ms) expires. Returns true if the replica is initialized when the call completes, false otherwise.

If timeout is -1, this function will not time out.