Qt Remote Objects 网络节点。 更多...
| 头： | #include <QRemoteObjectNode> |
| qmake: | QT += remoteobjects |
| 实例化： | Node |
| 继承： | QObject |
| 继承者： |
| enum | ErrorCode { NoError, RegistryNotAcquired, RegistryAlreadyHosted, NodeIsNoServer, ServerAlreadyCreated, …, ListenFailed } |
| typedef | RemoteObjectSchemaHandler |
| QRemoteObjectNode (const QUrl & registryAddress , QObject * parent = nullptr) | |
| QRemoteObjectNode (QObject * parent = nullptr) | |
| ObjectType * | acquire (const QString & name = QString()) |
| QRemoteObjectDynamicReplica * | acquireDynamic (const QString & name ) |
| QAbstractItemModelReplica * | acquireModel (const QString & name , QtRemoteObjects::InitialAction action = QtRemoteObjects::FetchRootSize, const QVector<int> & rolesHint = {}) |
| void | addClientSideConnection (QIODevice * ioDevice ) |
| bool | connectToNode (const QUrl & address ) |
| int | heartbeatInterval () const |
| QStringList | instances () const |
| QStringList | instances (const QString & typeName ) const |
| QRemoteObjectNode::ErrorCode | lastError () const |
| QRemoteObjectAbstractPersistedStore * | persistedStore () const |
| void | registerExternalSchema (const QString & schema , QRemoteObjectNode::RemoteObjectSchemaHandler handler ) |
| const QRemoteObjectRegistry * | registry () const |
| QUrl | registryUrl () const |
| void | setHeartbeatInterval (int interval ) |
| virtual void | setName (const QString & name ) |
| void | setPersistedStore (QRemoteObjectAbstractPersistedStore * persistedStore ) |
| virtual bool | setRegistryUrl (const QUrl & registryAddress ) |
| bool | waitForRegistry (int timeout = 30000) |
| void | heartbeatIntervalChanged (int heartbeatInterval ) |
| void | remoteObjectAdded (const QRemoteObjectSourceLocation & loc ) |
| void | remoteObjectRemoved (const QRemoteObjectSourceLocation & loc ) |
| virtual void | timerEvent ( QTimerEvent * ) override |
The QRemoteObjectNode class provides an entry point to a QtRemoteObjects 网络。网络可以简单到 2 节点，或任意复杂的一组进程和设备。
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 节点可以共享)。
节点可以相互直接连接使用 connectToNode ，或者它们可以使用 QRemoteObjectRegistry 以简化连接。
QRemoteObjectRegistry 是连接到注册 URL 的每个节点都可用的特殊复本。它知道如何连接到网络中的每个 QRemoteObjectSource 对象。
另请参阅 QRemoteObjectHost and QRemoteObjectRegistryHost .
此枚举类型指定各种错误代码所关联的 QRemoteObjectNode 错误：
| 常量 | 值 | 描述 |
|---|---|---|
QRemoteObjectNode::NoError
|
0
|
没有错误。 |
QRemoteObjectNode::RegistryNotAcquired
|
1
|
The registry could not be acquired. |
QRemoteObjectNode::RegistryAlreadyHosted
|
2
|
The registry is already defined and hosting Sources. |
QRemoteObjectNode::NodeIsNoServer
|
3
|
给定 QRemoteObjectNode is not a host node. |
QRemoteObjectNode::ServerAlreadyCreated
|
4
|
The host node has already been initialized. |
QRemoteObjectNode::UnintendedRegistryHosting
|
5
|
An attempt was made to create a host QRemoteObjectNode and connect to itself as the registry. |
QRemoteObjectNode::OperationNotValidOnClientNode
|
6
|
The attempted operation is not valid on a client QRemoteObjectNode . |
QRemoteObjectNode::SourceNotRegistered
|
7
|
The given QRemoteObjectSource is not registered on this node. |
QRemoteObjectNode::MissingObjectName
|
8
|
给定 QObject does not have objectName () set. |
QRemoteObjectNode::HostUrlInvalid
|
9
|
The given url has an invalid or unrecognized scheme. |
QRemoteObjectNode::ProtocolMismatch
|
10
|
The client and the server have different protocol versions. |
QRemoteObjectNode::ListenFailed
|
11
|
Can't listen on the specified host port. |
Typedef for a std::function method that can take a QUrl input and is responsible for creating the communications channel between this node and the node hosting the desired 源 . As some types of QIODevices (e.g., QSslSocket ) require additional steps before the device is ready for use, the method is responsible for calling addClientSideConnection once the connection is fully established.
This typedef was introduced in Qt 5.12.
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.
访问函数：
| int | heartbeatInterval () const |
| void | setHeartbeatInterval (int interval ) |
通知程序信号：
| void | heartbeatIntervalChanged (int heartbeatInterval ) |
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.
该特性在 Qt 5.11 引入。
访问函数：
| QRemoteObjectAbstractPersistedStore * | persistedStore () const |
| void | setPersistedStore (QRemoteObjectAbstractPersistedStore * persistedStore ) |
This property holds the address of the 注册 used by this node.
This is an empty QUrl 若没有在使用中的注册。
访问函数：
| QUrl | registryUrl () const |
| virtual bool | setRegistryUrl (const QUrl & registryAddress ) |
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 指定通过 registryAddress .
另请参阅 connectToNode , setRegistryUrl , QRemoteObjectHost ，和 QRemoteObjectRegistryHost .
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 .
另请参阅 connectToNode and setRegistryUrl .
[signal]
void
QRemoteObjectNode::
remoteObjectAdded
(const
QRemoteObjectSourceLocation
&
loc
)
This signal is emitted whenever a new 源 object is added to the Registry. The signal will not be emitted if there is no Registry set (i.e., Sources over connections made via connectToNode directly). The loc parameter contains the information about the added Source, including name, type and the QUrl of the hosting Node.
另请参阅 remoteObjectRemoved () 和 instances ().
[signal]
void
QRemoteObjectNode::
remoteObjectRemoved
(const
QRemoteObjectSourceLocation
&
loc
)
This signal is emitted whenever there is a known 源 object is removed from the Registry. The signal will not be emitted if there is no Registry set (i.e., Sources over connections made via connectToNode directly). The loc parameter contains the information about the removed Source, including name, type and the QUrl of the hosting Node.
另请参阅 remoteObjectAdded and instances .
Returns a pointer to a Replica of type ObjectType (which is a template parameter and must inherit from QRemoteObjectReplica ). That is, the template parameter must be a repc generated type. The name parameter can be used to specify the name given to the object during the QRemoteObjectHost::enableRemoting () 调用。
返回 QRemoteObjectDynamicReplica of the Source name .
Returns a pointer to a Replica which is specifically derived from QAbstractItemModel 。 name provided must match the name used with the matching enableRemoting that put the Model on the network. The returned model will be empty until it is initialized with the 源 .
In order to QRemoteObjectNode::acquire () Replica objects over 外部 QIODevices , Qt Remote Objects needs access to the communications channel (a QIODevice ) between the respective nodes. It is the addClientSideConnection() call that enables this, taking the ioDevice as input. Any acquire () call made without calling addClientSideConnection will still work, but the Node will not be able to initialize the Replica without being provided the connection to the Host node.
该函数在 Qt 5.12 引入。
另请参阅 QRemoteObjectHostBase::addHostSideConnection .
将客户端节点连接到主机节点按 address .
连接将仍然有效，直到主机节点被删除 (或通过网络不再可访问)。
客户端一旦连接到主机，然后就可以获得有效 Replicas (复本) 若正远程相应 Source (源)。
返回
true
当成功时，
false
否则 (通常是无法识别的 URL，或连接到已连接地址)。
注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .
This templated function (taking a repc generated type as the template parameter) will return the list of names of every instance of that type on the Remote Objects network. For example, if you have a Shape class defined in a .rep file, and Circle and Square classes inherit from the Source definition, they can be shared on the Remote Objects network using enableRemoting .
Square square; Circle circle; myHost.enableRemoting(&square, "Square"); myHost.enableRemoting(&circle, "Circle");
Then instance can be used to find the available instances of Shape.
QStringList instances = clientNode.instances<Shape>(); // will return a QStringList containing "Circle" and "Square" auto instance1 = clientNode.acquire<Shape>("Circle"); auto instance2 = clientNode.acquire<Shape>("Square"); ...
This function overloads instances().
This convenience function provides the same result as the templated version, but takes the name of the 源 class as a parameter ( typeName ) rather than deriving it from the class type.
Returns the last error set.
Provide a custom method to handle externally provided schemas
This method is tied to the 注册 and 外部模式 . By registering a std::function handler for an external schema, the registered method will be called when the registry is notified of a 源 you've acquired being available. Without this registration, QtRO would only be able to handle the "built-in" schemas.
The provided method, handler , will be called when the registry sees a 源 object on a new (not yet connected) Node with a {QUrl::schema()} of schema 。 handler , of type QRemoteObjectNode::RemoteObjectSchemaHandler will get the QUrl of the Node providing the 源 as an input parameter, and is responsible for establishing the communications channel (a QIODevice of some sort) and calling addClientSideConnection with it.
该函数在 Qt 5.12 引入。
另请参阅 RemoteObjectSchemaHandler .
Returns a pointer to the Node's QRemoteObjectRegistry , if the Node is using the Registry feature; otherwise it returns 0.
[virtual]
void
QRemoteObjectNode::
setName
(const
QString
&
name
)
设置 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.
[override virtual protected]
void
QRemoteObjectNode::
timerEvent
(
QTimerEvent *
)
重实现： QObject::timerEvent (QTimerEvent *event).
阻塞直到此节点的
注册
is initialized or
timeout
(in milliseconds) expires. Returns
true
若
注册
is successfully initialized upon return, or
false
否则。