Message subscription and delivery design modes in C #

From: http://blog.csdn.net/truexf/archive/2008/05/04/2378590.aspx

Application of the message subscription and delivery design model in the "platform-plug-in" Software Architecture Design

 

Define two interfaces

/* Message Receiver */

Interface imsgreceiver

{

Void processmessage (INT message, object OBJ); // Message Processing

Imsgsender getsender; // gets the message sender.

}

 

/* Message sender */

Interface imsgsender

{

Void bookmessage (imsgreceiver receiver, int message); // message subscription

Void dispatchmessage (INT message );

}

 

/* Message subscription record */

Struct msgreceiverinfo

{

Imsgreceiver extends er;

Int message;

}

 

/* Implement imsgsender in the system form framework */

Class baseform: form, imsgsender

{

Msgreceiverinfo array [] fmsgreceivers;/* used to save the message subscriber */

Public void bookmessage (imsgreceiver receiver, int message)

{

/* Add the consumer er to the fmsgreceivers list */

}

Public void dispatchmessage (INT message)

{

/* Iterate fmsgreceivers and call processmessage of the processmesser. */

}

 

// Call dispatchmessage in a specific event of the following framework

Protected void onformshow {...}

Protected void onformclose {...}

Protected void onformstatechange (State state ){...}

}

 

// Business control that implements the Message Receiver imsgreceiver

Class mycomponent: component, imsgreceiver

{

Void processmessage (INT message, object OBJ)

{

/* Handle a specific message */

}

Imsgsender getsender {

/* Return the framework of the control instance */

}

 

 

Void mycomponent {

 

/* Subscribe to messages in the constructor or other initialization areas */

 

Getsender. bookmessage (this, XXX );

 

}

 

 

}