CN114500625A - Structure for realizing RPC service by utilizing DDS network middleware in CP AutoSAR - Google Patents

Abstract

The invention relates to a structure for realizing RPC service by utilizing DDS network middleware in CP AutoSAR, belonging to the technical field of network architecture. The structure comprises a plurality of clients, a plurality of servers, a sending end and a receiving end, wherein each client is attached to the same sending end, and each server is attached to the same receiving end through a distributor; the sending end sends the label data to a receiving end; and determining the corresponding server to which the data should be dispatched according to the globally unique identifier carried in the label data sent from the client to the server. The invention solves the problem that the traditional DDS can not be deployed in the MCU hardware environment with limited resources, and the advantages of the DDS middleware can be fully exerted.

Description

Structure for realizing RPC service by utilizing DDS network middleware in CP AutoSAR

Technical Field

The invention relates to a structure for realizing RPC service by utilizing DDS network middleware in CP AutoSAR, belonging to the technical field of network architecture.

Background

In a typical usage scenario of CP AutoSAR, function calls are often presented in the form of Remote Procedure Calls (RPC), most RPC calls can be summarized into the following two forms,

an RR (Request/Response) form means that two nodes running the CP AutoSAR App are respectively defined as a Client and a Server, the Client sends a Request to the Server in an RPC form, the Server executes corresponding operation after receiving the Request, and then responds an execution result to a Client end in the RPC form;

the Event/Notify form means that two nodes running the CP AutoSAR App are respectively defined as a Client and a Server, and the Server can send an Event or a notification to the Client section through the RPC form.

The RPC calls in the forms have incomparable advantages in terms of transmission quality control, service discovery/subscription and the like compared with SomeIP, but the DDS network middleware has incomparable advantages in terms of transmission quality control, service discovery/subscription and the like compared with SomeIP, but as the DDS protocol is specified, a data path for bearing the RPC calls means that Topic must be attached to a DDS Writer or Reader entity, and a DDS Writer or DDS Reader needs to consume about 10k bytes of memory, and when a large number of RPC calls exist in the system, the memory actually needed to be occupied greatly exceeds the resource size which can be provided by typical deployment hardware of CP AutoSAR.

As mentioned above, although the DDS middleware has many advantages, due to the protocol limitation, there is a defect that the occupied memory is large naturally, which is fatal to the hardware of the microcontroller such as MCU, and this will directly result in the need to increase the number of MCUs in the whole vehicle, greatly increasing the cost and the difficulty of network design/implementation.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a method for judging consistency of incremental snapshot market data is provided.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a structure for realizing RPC service in CP AutoSAR utilizes DDS network middleware, the DDS network middleware is integrated in CP AutoSAR in the form of assembly, the RPC message of CP AutoSAR is communicated through the DDS network middleware, the structure comprises a plurality of clients, a plurality of servers, a transmitting end and a receiving end, each client is attached to the same transmitting end, and each server is attached to the same receiving end through a distributor; the sending end sends the label data to a receiving end;

the tag data determines the corresponding server to which the data should be dispatched according to the globally unique identifier carried in the tag data sent from the client to the server.

The invention has the beneficial effects that: the invention utilizes the multi-message transmission capability of the DDS, can smoothly bear a large amount of services on one piece of Topic, solves the problem that the traditional DDS cannot be deployed in the MCU hardware environment with limited resources, and makes full use of the advantages of the DDS middleware.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

Example one

In the structure of this embodiment, a CP AutoSAR utilizes a DDS network middleware to implement RPC service, as shown in fig. 1, includes a plurality of clients (Client 1 … … Client N), a plurality of servers (Server 1 … … Server N), a sending end (DDS writer), and a receiving end (DDS Reader), where each Client is attached to the same sending end, and each Server is attached to the same receiving end through a Dispatcher (Dispatcher); the receiving end sends the label data (Topic) to the receiving end; the tag data determines the corresponding server to which the data should be served according to a Globally Unique Identifier (GUID) carried in the tag data sent from the client to the server.

In this embodiment, a Globally Unique Identifier (GUID) for identifying the service is added to each RPC call packet, and a dispatcher capable of resolving the globally unique identifier is implemented in CP AutoSAR.

The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be made in the present invention in addition to the above embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.

Claims (1)

1. The utility model provides a structure in order to realize RPC service at CP AutoSAR utilizes DDS network middleware, includes a plurality of clients, a plurality of server, sending terminal and receiving terminal, its characterized in that: the DDS network middleware is integrated in the CP AutoSAR in a component mode, RPC messages of the CP AutoSAR are communicated through the DDS network middleware, all clients are attached to the same sending end, and all servers are attached to the same receiving end through dispatchers; the sending end sends the label data to a receiving end;

the tag data determines the corresponding server to which the data should be dispatched according to the globally unique identifier carried in the tag data sent from the client to the server.

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