pynetdicom.dimse.DIMSEServiceProvider

class pynetdicom.dimse.DIMSEServiceProvider(assoc)

The DIMSE service provider.

Changed in version 1.2: Added msg_queue attribute

Messages

Primitive	Type	Message Class
C-CANCEL	Request/indication	C_CANCEL_RQ
C-ECHO	Request/indication	C_ECHO_RQ
	Response/confirmation	C_ECHO_RSP
C-FIND	Request/indication	C_FIND_RQ
	Response/confirmation	C_FIND_RSP
C-GET	Request/indication	C_GET_RQ
	Response/confirmation	C_GET_RSP
C-MOVE	Request/indication	C_MOVE_RQ
	Response/confirmation	C_MOVE_RSP
C-STORE	Request/indication	C_STORE_RQ
	Response/confirmation	C_STORE_RSP
N-ACTION	Request/indication	N_ACTION_RQ
	Response/confirmation	N_ACTION_RSP
N-CREATE	Request/indication	N_CREATE_RQ
	Response/confirmation	N_CREATE_RSP
N-DELETE	Request/indication	N_DELETE_RQ
	Response/confirmation	N_DELETE_RSP
N-EVENT-REPORT	Request/indication	N_EVENT_REPORT_RQ
	Response/confirmation	N_EVENT_REPORT_RSP
N-GET	Request/indication	N_GET_RQ
	Response/confirmation	N_GET_RSP
N-SET	Request/indication	N_SET_RQ
	Response/confirmation	N_SET_RSP

cancel_rq

A dict of {MessageIDBeingRespondedTo : C_CANCEL} messages received. The dict is cleared out at the start and end of Service Class operations and is limited to a maximum of 10 messages.

Type

dict

message

The DIMSE message currently being received.

Type

dimse_messages.DIMSEMessage or None

msg_queue

A queue holding decoded DIMSE Message primitives received from the peer, except for C-CANCEL requests.

Type

queue.queue of dimse_messages.DIMSEMessage

References

• DICOM Standard, Part 7

__init__(assoc)

Initialise the DIMSE service provider.

Changed in version 1.3: Class initialisation now only takes assoc parameter.

Parameters

assoc (association.Association) – The association to provide DIMSE services for.

Methods

__init__(assoc)	Initialise the DIMSE service provider.
get_msg([block])	Get the next available DIMSE message.
peek_msg()	Return the first message in the message queue or None.
receive_primitive(primitive)	Process a P-DATA primitive received from the remote.
send_msg(primitive, context_id)	Encode and send a DIMSE-C or DIMSE-N message to the peer AE.

Attributes

assoc	Return the parent Association.
dimse_timeout	Return the DIMSE timeout as numeric or None.
dul	Return the DULServiceProvider.
maximum_pdu_size	Return the peer’s maximum PDU length as int.

property assoc

Return the parent Association.

New in version 1.3.

property dimse_timeout

Return the DIMSE timeout as numeric or None.

property dul

Return the DULServiceProvider.

get_msg(block=False)

Get the next available DIMSE message.

New in version 1.2.

Changed in version 1.5: Changed to also return (None, None) if the peer aborts the association or the connection is closed.

Parameters

block (bool) – If True then the function will block until either a message is available or dimse_timeout expires, otherwise non-blocking.

Returns

The next available (Context ID, DIMSE Message), which is taken off the queue, or (None, None) if the peer has aborted the association, the connection is closed or if no messages are available within the dimse_timeout period.

Return type

(int, dimse_messages.DIMSEMessage) or (None, None)

property maximum_pdu_size

Return the peer’s maximum PDU length as int.

peek_msg()

Return the first message in the message queue or None.

New in version 1.2.

Returns

The first (Context ID, Message) in the queue if one is available, otherwise (None, None). No messages are taken out of the queue.

Return type

(int, dimse_messages.DIMSEMessage) or (None, None)

receive_primitive(primitive)

Process a P-DATA primitive received from the remote.

New in version 1.2.

A DIMSE message is split into one or more P-DATA primitives, which must be sent in sequential order. While waiting for all the P-DATA primitives associated with a message the encoded data is stored in message, which is decoded only when complete and converted into a DIMSE Message primitive which is added to the msg_queue.

This makes it possible to process incoming P-DATA primitives into DIMSE messages while a service class implementation is running.

Parameters

primitive (pdu_primitives.P_DATA) – A P-DATA primitive received from the peer to be processed.

send_msg(primitive, context_id)

Encode and send a DIMSE-C or DIMSE-N message to the peer AE.

Parameters

• primitive (dimse_primitives DIMSE Primitive class) – The DIMSE message primitive to send to the peer.

• context_id (int) – The ID of the presentation context that the message is to be sent under.