QRemoteObjectNode#

A node on a Qt Remote Objects network. More

Inherited by: QRemoteObjectHostBase, QRemoteObjectRegistryHost, QRemoteObjectHost

Synopsis#

Functions#

Virtual functions#

Signals#

Detailed Description#

The QRemoteObjectNode class provides an entry point to a QtRemoteObjects network. A network can be as simple as two nodes, or an arbitrarily complex set of processes and devices.

A QRemoteObjectNode does not have a url that other nodes can connect to, and thus is able to acquire replicas only. It is not able to share source objects (only QRemoteObjectHost and QRemoteObjectRegistryHost Nodes can share).

Nodes may connect to each other directly using connectToNode , or they can use the QRemoteObjectRegistry to simplify connections.

The QRemoteObjectRegistry is a special replica available to every node that connects to the Registry Url. It knows how to connect to every QRemoteObjectSource object on the network.

class PySide6.QtRemoteObjects.QRemoteObjectNode([parent=None])#

PySide6.QtRemoteObjects.QRemoteObjectNode(registryAddress[, parent=None])

Parameters

Default constructor for QRemoteObjectNode with the given parent. A Node constructed in this manner can not be connected to, and thus can not expose Source objects on the network. It also will not include a QRemoteObjectRegistry , unless set manually using setRegistryUrl .

QRemoteObjectNode connected to a { QRemoteObjectRegistry } {Registry}. A Node constructed in this manner can not be connected to, and thus can not expose Source objects on the network. Finding and connecting to other (Host) Nodes is handled by the QRemoteObjectRegistry specified by registryAddress.

PySide6.QtRemoteObjects.QRemoteObjectNode.ErrorCode#

This enum type specifies the various error codes associated with QRemoteObjectNode errors:

Constant

Description

QRemoteObjectNode.NoError

No error.

QRemoteObjectNode.RegistryNotAcquired

The registry could not be acquired.

QRemoteObjectNode.RegistryAlreadyHosted

The registry is already defined and hosting Sources.

QRemoteObjectNode.NodeIsNoServer

The given QRemoteObjectNode is not a host node.

QRemoteObjectNode.ServerAlreadyCreated

The host node has already been initialized.

QRemoteObjectNode.UnintendedRegistryHosting

An attempt was made to create a host QRemoteObjectNode and connect to itself as the registry.

QRemoteObjectNode.OperationNotValidOnClientNode

The attempted operation is not valid on a client QRemoteObjectNode .

QRemoteObjectNode.SourceNotRegistered

The given QRemoteObjectSource is not registered on this node.

QRemoteObjectNode.MissingObjectName

The given QObject does not have objectName() set.

QRemoteObjectNode.HostUrlInvalid

The given url has an invalid or unrecognized scheme.

QRemoteObjectNode.ProtocolMismatch

The client and the server have different protocol versions.

QRemoteObjectNode.ListenFailed

Can’t listen on the specified host port.

PySide6.QtRemoteObjects.QRemoteObjectNode.acquireDynamic(name)#
Parameters

name – str

Return type

PySide6.QtRemoteObjects.QRemoteObjectDynamicReplica

Returns a QRemoteObjectDynamicReplica of the Source name.

PySide6.QtRemoteObjects.QRemoteObjectNode.acquireModel(name)#
Parameters

name – str

Return type

PySide6.QtRemoteObjects.QAbstractItemModelReplica

PySide6.QtRemoteObjects.QRemoteObjectNode.addClientSideConnection(ioDevice)#
Parameters

ioDevicePySide6.QtCore.QIODevice

In order to acquire() Replica objects over External QIODevices , Qt Remote Objects needs access to the communications channel (a QIODevice ) between the respective nodes. It is the call that enables this, taking the ioDevice as input. Any acquire() call made without calling will still work, but the Node will not be able to initialize the Replica without being provided the connection to the Host node.

PySide6.QtRemoteObjects.QRemoteObjectNode.connectToNode(address)#
Parameters

addressPySide6.QtCore.QUrl

Return type

bool

Connects a client node to the host node at address.

Connections will remain valid until the host node is deleted or no longer accessible over a network.

Once a client is connected to a host, valid Replicas can then be acquired if the corresponding Source is being remoted.

Return true on success, false otherwise (usually an unrecognized url, or connecting to already connected address).

PySide6.QtRemoteObjects.QRemoteObjectNode.error(errorCode)#
Parameters

errorCodeErrorCode

PySide6.QtRemoteObjects.QRemoteObjectNode.heartbeatInterval()#
Return type

int

This property holds Heartbeat interval in ms..

The heartbeat (only helpful for socket connections) will periodically send a message to connected nodes to detect whether the connection was disrupted. Qt Remote Objects will try to reconnect automatically if it detects a dropped connection. This function can help with that detection since the client will only detect that the server is unavailable when it tries to send data.

A value of 0 (the default) will disable the heartbeat.

PySide6.QtRemoteObjects.QRemoteObjectNode.heartbeatIntervalChanged(heartbeatInterval)#
Parameters

heartbeatInterval – int

PySide6.QtRemoteObjects.QRemoteObjectNode.instances(typeName)#
Parameters

typeNameQStringView

Return type

list of strings

This function overloads instances() .

This convenience function provides the same result as the templated version, but takes the name of the Source class as a parameter (typeName) rather than deriving it from the class type.

PySide6.QtRemoteObjects.QRemoteObjectNode.lastError()#
Return type

ErrorCode

Returns the last error set.

PySide6.QtRemoteObjects.QRemoteObjectNode.persistedStore()#
Return type

PySide6.QtRemoteObjects.QRemoteObjectAbstractPersistedStore

This property holds Allows setting a QRemoteObjectAbstractPersistedStore instance for the node..

Allows replica PROP members with the PERSISTED trait to save their current value when the replica is deleted and restore a stored value the next time the replica is started.

Requires a QRemoteObjectAbstractPersistedStore class implementation to control where and how persistence is handled.

PySide6.QtRemoteObjects.QRemoteObjectNode.registry()#
Return type

PySide6.QtRemoteObjects.QRemoteObjectRegistry

Returns a pointer to the Node’s QRemoteObjectRegistry , if the Node is using the Registry feature; otherwise it returns None.

PySide6.QtRemoteObjects.QRemoteObjectNode.registryUrl()#
Return type

PySide6.QtCore.QUrl

This property holds The address of the Registry used by this node..

This is an empty QUrl if there is no registry in use.

PySide6.QtRemoteObjects.QRemoteObjectNode.remoteObjectAdded(arg__1)#
Parameters

arg__1

PySide6.QtRemoteObjects.QRemoteObjectNode.remoteObjectRemoved(arg__1)#
Parameters

arg__1

PySide6.QtRemoteObjects.QRemoteObjectNode.setHeartbeatInterval(interval)#
Parameters

interval – int

This property holds Heartbeat interval in ms..

The heartbeat (only helpful for socket connections) will periodically send a message to connected nodes to detect whether the connection was disrupted. Qt Remote Objects will try to reconnect automatically if it detects a dropped connection. This function can help with that detection since the client will only detect that the server is unavailable when it tries to send data.

A value of 0 (the default) will disable the heartbeat.

PySide6.QtRemoteObjects.QRemoteObjectNode.setName(name)#
Parameters

name – str

Sets name as the internal name for this Node. This is then output as part of the logging (if enabled). This is primarily useful if you merge log data from multiple nodes.

PySide6.QtRemoteObjects.QRemoteObjectNode.setPersistedStore(persistedStore)#
Parameters

persistedStorePySide6.QtRemoteObjects.QRemoteObjectAbstractPersistedStore

This property holds Allows setting a QRemoteObjectAbstractPersistedStore instance for the node..

Allows replica PROP members with the PERSISTED trait to save their current value when the replica is deleted and restore a stored value the next time the replica is started.

Requires a QRemoteObjectAbstractPersistedStore class implementation to control where and how persistence is handled.

PySide6.QtRemoteObjects.QRemoteObjectNode.setRegistryUrl(registryAddress)#
Parameters

registryAddressPySide6.QtCore.QUrl

Return type

bool

See also

registryUrl()

PySide6.QtRemoteObjects.QRemoteObjectNode.waitForRegistry([timeout=30000])#
Parameters

timeout – int

Return type

bool

Blocks until this Node’s Registry is initialized or timeout (in milliseconds) expires. Returns true if the Registry is successfully initialized upon return, or false otherwise.