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_exception

QMF_DATA

Agent

reply-to

This general-purpose message can be sent by an agent in response to any request (query, subscription, method) if the request could not be completed for any reason. The QMF_DATA in the message body contains details of why the failure occurred.

_agent_locate_request

QMF_QUERY_PREDICATE

Console

QMF Topic

A console may send an agent-locate-request in order to reach all available agents. The predicate may be used to limit the set of agents that will respond to the request.

_agent_locate_response

QMF_DATA

Agent

reply-to

This is a response to an agent-locate-request. An agent will send an agent-locate-response if it received an agent-locate-request with a predicate that matches its characteristics.

_agent_heartbeat_indication

QMF_DATA

Agent

Topic

Each agent periodically sends a heartbeat message to a topic to indicate that it is alive and connected. The content of the heartbeat message is the list of the agent's characteristics.

_query_request

defined by qmf.content (either QMF_QUERY or QMF_V1_QUERY)

Console

Agent

A console sends a query to an agent to request that the agent send data to the requester.

_query_response

List of <qmf.content>

Agent

reply-to

The response to a query sent by a console.

_subscribe_request

QMF_SUBSCRIBE

Console

Agent

A console sends a subscribe-request to an agent to receive data matched by a query. A subscription differs from a query request in that it continues to send updated information to the console when the data changes.

_subscribe_response

QMF_SUBSCRIPTION

Agent

reply-to

When an agent receives a subscribe-request, it sends a subscribe-response granting (or refusing) the subscription.  Should the subscription succeed, the response will contain an identifier for the subscription assigned by the Agent. Thereafter, it will send data-indication messages on the same correlation-id with updates when they happen or periodically.  The first data-indication message sent by the agent will contain all matching data, subsequent data-indications will contain only those matching data that has changed since the last update.

_subscribe_cancel_indication

QMF_SUBSCRIPTION_ID

Console

Agent

A console can request that a subscription it created be immediately cancelled. This message must have the same correlation-id as the original request, and contain the subscription identifier as assigned by the Agent.

_subscribe_refresh_indication

QMF_SUBSCRIPTION_ID

Console

Agent

A console can keep a subscription alive by periodically refreshing it by sending a subscribe-refresh-indication. This message must have the same correlation-id as the original request, and contain the subscription identifier as assigned by the Agent.

_data_indication

List of <qmf.content>

Agent

reply-to or topic

A data indication is sent by an Agent when 1) subscription data has changed and needs to be published, 2) an event has occurred and event data is being published, and 3) any other time an agent wants to send unsolicited data.

_method_request

QMF_METHOD_CALL

Console

Agent

A console may invoke a method on an object managed by an agent. It may also invoke a method directly on the agent if appropriate. This message contains the method call including the input arguments.

_method_response

QMF_METHOD_RESULT

Agent

reply-to

A method call always results in a single method result. This message carries either the output arguments from a successful method call or it holds an exception to describe a failure.

_schema_package

STRING

Schema package name

_schema_id

SCHEMA_ID

Schema class identifier

_schema_class

SCHEMA_CLASS

Schema class definition

_object_id

OBJECT_ID

Managed object identifier

_data

QMF_DATA

Data, managed and/or described or free-form

_event

QMF_EVENT

Event

_query

QMF_QUERY

QMFv2 Query

_query_v1

QMF_V1_QUERY

Query map from the QMFv1 Specification