JPH04182739A - Message communication system between objects - Google Patents

Abstract

PURPOSE:To communicate a message to an object that is dynamically generated and its existence can not be confirmed by confirming the presence or absence of the object on the other side to the control object controlling the existence of all the objects including newly generated objects. CONSTITUTION:When an object is dynamically generated, the information of the novel object is stored in an object information control part 5 as a control object part 2 by up dating the information in an object information storage part 1 and giving an instruction to an object control part 4. A message transmission is transmitted to the control object part 2 with an index indicating the object of a transmission destination. The control object part 2 confirms whether the object of the transmission destination exists in the object control information storage part 1 or not. In the case of its presence, the control object part 2 transmits the message to the object of the transmission destination. In the case of its absence, the control object part 2 transmits a transmission rejection message to the the object of the originating transmitter. Thus, the transmitting the message to the object that is dynamically generated by other object and its existence can not be confirmed can be made.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for communicating messages between objects in an object-oriented computational model in which processing is performed by a group of objects that independently proceed with processing by receiving messages. Regarding communication methods.

(Prior Art) One of the forms of information processing is an object-oriented calculation model. This is a computational model that considers objects as independent computational entities and advances processing by exchanging information between objects through messages.

By the way, in such a computational model, it would be ideal for objects to be generated dynamically, and the resources corresponding to the dynamically generated objects would also be dynamically combined and used. be.

However, in conventional execution formats, it is not possible to check the existence of dynamically generated objects, so the objects that the sender of a message can use as destinations are objects whose existence has already been defined before execution. However, there was a problem in that the sender was limited to objects that he or she had dynamically created themselves.

(Problem to be solved by the invention) In this way, in the object-oriented computational model,
Ideally, resources corresponding to dynamically generated objects should be dynamically combined and used, or in conventional execution forms, it is not possible to confirm the existence of such objects. There was a problem in which the objects that a sender could use as a destination were either objects whose existence was already defined before execution, or objects that were dynamically created by the sender or itself. .

The present invention was made to solve such problems, and provides a message communication method between objects that can send messages even to objects whose existence cannot be confirmed because they are dynamically created by other objects. It is intended to.

[Configuration of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides a plurality of objects that proceed with processing independently and dynamically generate new objects by receiving messages. In an object-oriented computational model that advances processing by communicating messages between these objects, there is a management object that manages the existence of all objects, including the newly created object, and Message communication is performed after confirming the presence or absence of the other party's object using the managed object.

(Function) In the present invention, when message communication is performed between objects, the presence or absence of the other object is checked against the management object that manages the existence of all objects including newly created objects. Messages can be sent even to objects whose existence cannot be confirmed because they are dynamically created by other objects.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an object-oriented calculation model according to an embodiment of the present invention.

As shown in the figure, this model includes an object management information storage section 1, a managed object section 2, a processing execution section 3, an object control section 4, and an object information storage section 5.

The object management information storage unit 1 stores information regarding the existence of all objects on the system during the execution process.

Information regarding normal objects is stored in the object information storage section 5, and processing inside the object is executed in the processing execution section 3 under the control of the object control section 4.

When an object is dynamically generated in the processing execution process, the managed object unit 2 updates the information in the object information storage unit 1 and issues an instruction to the object control unit 4 to update the object information of the new object. Storage in the pre-loading section 5 is performed.

The message transmission is sent to the managed object 2 along with an indicator indicating the destination object. The managed object 2 checks whether the destination object exists in the object management information storage section 1, and if it exists, sends a message to the destination object; if it does not exist,
Sends a rejection message to the sending object.

Next, an execution model when generating an object according to this embodiment will be explained using FIG. 2.

In the figure, circles (and ellipses) indicate objects, and arrows indicate the direction of messages.

In this example, object A10 generates object Bll as shown by the thick line. However, in the actual message flow, as shown by the thin line, the object AIO sends a message to the managed object 12 requesting the generation of the object B11, and the managed object 12 generates the object B11.

Next, an execution model for message transmission between objects according to this embodiment will be explained with reference to FIG.

In this example, a message is transmitted from object A20 to object B21, as shown by the thick line. However, as shown by the thin line, the actual flow of the message is that the message is sent from the object A20 to the managed object 22 along with the destination object name, and the managed object 22 confirms the existence of the destination object, and then sends the message to the destination object B20. Send a message.

Next, an execution model for message transmission when no object exists will be explained using FIG. 4.

In order to send a message to object X, object A 30 internally sends a message to managed object 31 along with the destination object name. The managed object 31 confirms the existence of object X, which is the destination, but since object X does not exist, it sends back a message to object A 30, which is the source, refusing to send the message.

In this way, in this embodiment, when transmitting a message, it is checked whether the destination object exists in the object management information storage section l, and if it exists, the message is sent to the destination object, and if the destination object does not exist, it is checked. In case,
Since a transmission refusal message is sent to the sender object, it is possible to send a message even to an object that is dynamically created by another object and whose existence cannot be confirmed.

[Effects of the Invention] As detailed above, according to the message communication method between objects of the present invention, when message communication is performed between objects, the existence of all objects including newly created objects can be managed. Since we are checking the existence or nonexistence of the other side object for the managed object to be used,
Messages can be sent even to objects whose existence cannot be confirmed because they are dynamically created by other objects.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of an object-oriented calculation model according to an embodiment of the present invention, Fig. 2 is an execution model diagram when dynamically generating objects, and Fig. 3 is a diagram when a destination object exists. FIG. 4 is an execution model diagram of message transmission when the destination object does not exist. 1... Object management information storage unit, 2... Management object unit, 3... Process execution unit, 4... Object control unit, 5... Object information storage unit. Applicant Toshiba Corporation Patent Attorney Sasa Suyama - Figure 1 Figure 2

Claims (1)

[Claims] (1) In an object-oriented computing model that has multiple objects that proceed with processing independently by receiving messages and dynamically generate new objects, and in which processing proceeds by communicating messages between these objects, has a managed object that manages the existence of all objects including objects generated in A message communication method between objects characterized by: