EMA C++ RDM Usage Guide : 9 Market Maker Domain : 9.2 Usage : 9.2.3 Market Maker Update Message
 
9.2.3 Market Maker Update Message
A Market Maker update message is encoded using UpdateMsg and sent by Open Message Model interactive provider and non-interactive provider applications. Updates will not be received before images, and a true snapshot is supported.
The provider can send an update message to add, update, or remove market maker information.
 
NOTE: The provider should send the Name and ServiceName only in the first Refresh response message. However if MsgKeyInUpdates is set to true, then the Name and ServiceName must be provided for every Update response message.
 
Table 63: Market Maker Update Message  
COMPONENT
DESCRIPTION / VALUE
DomainType
Required. MMT_MARKET_MAKER = 9
UpdateTypeNum
Required. Indicates the general content of the update. Typically sent as one of the following:
INSTRUMENT_UPDATE_UNSPECIFIED = 0
INSTRUMENT_UPDATE_QUOTE = 1
Indications
Optional:
DoNotCache: true, specifies that the update message should not be cached.
DoNotConflate: true, specifies that the update message should not be conflated.
PartNum
Not used.
QoS
Optional. Specifies the QoS at which the stream is provided.
SeqNum
Optional. A user-specified, item-level sequence number which can be used by the application for sequencing messages within this stream.
ConflatedCount
Optional. If a provider sends a conflated update, ConflatedCount specifies how many updates are in the conflation.
The consumer indicates interest in this information by setting ReqMsg.ConflatedInUpdates to true in the request.
ConflatedTime
Optional. If a provider sends a conflated update, ConflatedTime specifies the time interval (in milliseconds) over which data is conflated.
The consumer indicates interest in this information by setting ReqMsg.ConflatedInUpdates to true in the request.
PermissionData
Optional. Specifies permissioning information associated only with the contents of this update.
extendedHeader
Not used.
ServiceName
Conditional. ServiceName is required if MsgKeyInUpdates was set to true. ServiceName specifies the name of the service that provides the data.
NOTE: The provider application should set either the ServiceName or ServiceId of the service, but not both.
ServiceId
Conditional. ServiceId is required if MsgKeyInUpdates was set to true. ServiceId specifies the ID of the service that provides the item.
NOTE: The provider application should set either the ServiceName or ServiceId of the service, but not both.
NameType
Conditional. NameType is required if MsgKeyInUpdates was set to true. NameType must match the name type in the item’s request message (typically INSTRUMENT_NAME_RIC = 1). If absent, NameType defaults to INSTRUMENT_NAME_RIC = 1.
Name
Conditional. Name is required if MsgKeyInUpdates was set to true. Name specifies the name of the item being provided.
Filter
Not used.
Identifier
Not used.
Attrib
Not used.
Payload
Required. A Market Maker is represented by a Map, where each entry (MapEntry) contains a FieldList which in turn contains information about a market maker.