kMsgInfo Class Reference

Description

Represents message source information and an attached message.

kMsgInfo is a top-level container for a FireSync data message. Message content can be accessed via the Message property.

Each kMsgInfo instance also contains a small amount of metadata related to message routing. The Source property describes the origin of a message (node id, block id, port id). The Tag property is provided for use within data processing envionments, for implementation-specific purposes; this property should typically be ignored in application code.

The following example illustrates how to log various information related to a standard FireSync video message.

kStatus PrintVideoMessage(kMsgInfo msgInfo)
{
    kMsgSet message = kMsgInfo_Message(msgInfo); 
    kMsgSource source = kMsgInfo_Source(msgInfo); 

    kLogf("Received %s from Node-%u, Block-%u, Port-%u", kType_Name(kObject_Type(message)), 
        source.nodeId, source.blockId, source.portId); 

    //verify that the message is of type kMsg (the most common message type; used for video messages)
    if (kObject_Is(message, kTypeOf(kMsg)))
    {
        const kStamp* stamp = kMsg_Stamp(message); 
        kObject content = kMsg_Data(message); 

        kLogf("  Time: %llu", stamp->time); 
        kLogf("  Encoder: %lld", stamp->encoder); 
        kLogf("  Content Type: %s", kType_Name(kObject_Type(content))); 

        if (kObject_Is(content, kTypeOf(kImage)))
        {
            kLogf("  Pixel Type: %s", kType_Name(kImage_PixelType(content))); 
            kLogf("  Width: %u", kImage_Width(content)); 
            kLogf("  Height: %u", kImage_Height(content)); 
        }
    }

    return kOK; 
}

Inheritance diagram for kMsgInfo:

Public Member Functions
kStatus	kMsgInfo_Construct (kMsgInfo *info, kMsgSource source, kSize tag, kMsgSet message, kAlloc allocator)
	Constructs a kMsgInfo object. More...
kMsgSet	kMsgInfo_Message (kMsgInfo info)
	Gets the message object. More...
kStatus	kMsgInfo_SetMessage (kMsgInfo info, kMsgSet message)
	Sets the message object. More...
kStatus	kMsgInfo_SetSource (kMsgInfo info, kMsgSource source)
	Sets the message source. More...
kStatus	kMsgInfo_SetTag (kMsgInfo info, kSize tag)
	Sets the message tag. More...
kMsgSource	kMsgInfo_Source (kMsgInfo info)
	Gets the message source. More...
kSize	kMsgInfo_Tag (kMsgInfo info)
	Gets the message tag. More...

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The documentation for this class was generated from the following file:

• Data/kMsgInfo.h