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The Collaboration receives the HL7 V2 message from the external using
receiveHL7message()

. If an exception occurs due to incomplete data, and the adapter fails to

read the data within the configured number of retries, the associated recourse action is taken. If
the exception is due to no response, the associated recourse action is taken.

Exception 

occurred?

Exception due 

to incomplete 

data

        receiveAndSend()

Gets the HL7 message from 

the external , validates it 

and sends ACK/NAK

validateHL7Message()

Validates HL7 message and 

determines if it should send 

HL7 ACK / NAK

Calls other helper 
methods to validate 
message and 
sequence 
number

       receiveHL7Message()

receives the HL7  message 

from the external

NO

NO

YES

YES

Continue

Continued

Handle Max Failed 

read retry.Take 
recourse action

Handle No 

reponse 

error.Take 

recourse action 

Here the eWay receives the HL7 message, 
persists the received message in a database, 
sends MLLPV2 commit ack if the persistence is 
successful or nak if not successful. If the 
received message is a duplicate message, 
the corresponding ack/nak is retrieved from 
the database and sent to external. The 
received message is returned as null so that 
the collab can skip processing the message

HL7 V2 Standard Inbound Message Mode Data Flow over MLLPV2 — Part 2

MLLP V2 and the Sample Projects

Sun Adapter for TCP/IP HL7 User's Guide • October 2009

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