				EADELIA
				(B) (C)

Section for use

onError / onMessage

Syntax

In an onMessage section

BRK_GET_MSG <result variable> encoding

encoding	→	Null \| *ENCODING(EncodingValue)
EncodingValue	→	<AlphaConstant> \| <AlphaVarId>

BRK_GET_MSG AlphaPropertyName <result variable>

In an onError section

BRK_GET_MSG ErrorInfoType <result variable>

ErrorInfoType

→

*ERROR_CODE | *IMMED_STOP | * ERROR_MSG

Description

In an onMessage section

This instruction retrieves information contained in the received message.

Retrieving a message's payload.

BRK_GET_MSG <result variable> <encoding>

When this instruction is called, the result variable receives the payload contained in the message. The variable type depends on the type of payload supported by the message broker.

Message broker	Native payload type	Compatible Adelia types
Kafka	Avro / Double / Integer / Long / Short / String / Byte array	ALPHA / IMAGE / REF_CLASS / NUM_E / NUM_P / NUM_BIN_2 / NUM_BIN_4 / NUM_BIN_8
Nats Jetstream	Byte array	ALPHA / IMAGE / REF_CLASS
MQTT v3	Byte array	ALPHA / IMAGE / REF_CLASS
MQTT v5	Byte array	ALPHA / IMAGE / REF_CLASS
RabbitMQ AMQP	Byte array	ALPHA / IMAGE / REF_CLASS
Redis Pub/Sub	Byte array/Alphanumeric	ALPHA / IMAGE / REF_CLASS

REF_CLASS result variable:

If the result variable is REF_CLASS, we assume that the payload is JSON data (alphanumeric or byte array) encoded in UTF-8. JSON deserialization is applied to this data to populate the REF_CLASS variable.

Deserialization is based on the third-party Jackson converter: the converter's default properties can be modified by entering the customObjectMapper property of the Adelia subscriber.

ALPHA result variable and encoding:

If the result variable is ALPHA and the payload is a byte array, character encoding to be used when converting the byte array to an alphanumeric string can be specified. This encoding value must be included in the character set registry defined by the IANA. It must also be included in the character sets supported by the JVM.

When encoding is specified, the conversion is carried out according to the encoding value.

When no encoding is specified, the conversion rules vary according to the target broker and the properties of the message to process.

Message broker	Conversion rule.
Kafka	The encoding used is the default encoding of the JVM executing the AMBSS.
Nats Jetstream	The encoding used is the default encoding of the JVM executing the AMBSS.
MQTT v3	The encoding used is the default encoding of the JVM executing the AMBSS.
MQTT v5	If the message's properties/payloadFormat property is true, UTF-8 encoding is used. If not, the encoding used is the default encoding of the JVM executing the AMBSS.
RabbitMQ AMQP	If the message has the basicProperties/contentEncoding property and it defines valid character encoding, this encoding is used. If not, the encoding used is the default encoding of the JVM executing the AMBSS.
Redis Pub/Sub	The encoding used is the default encoding of the JVM executing the AMBSS.

Retrieving a property from a message

BRK_GET_MSG AlphaPropertyName <result variable>

This instruction is used to retrieve information about the message (apart from payload). Each item of information is defined by a key (AlphaPropertyName parameter) and has an associated typed value (result variable parameter).

The key can be defined either by an alphanumeric variable or by an alphanumeric literal. Its value represents an XPath expression and designates a native property of the message, so dependent upon the message broker associated with the Adelia subscriber.

Key value	Property description	Property type
Message from Kafka
offset	Position of the message in the associated Kafka partition.	NUM_BIN_8
topic	Name of the topic the message is from.	ALPHA(n)
partition	Partition the message is received from.	ALPHA(n)
key	Key associated with the message (this key may not exist if the issuer has not associated a key with the message).	ALPHA / IMAGE / REF_CLASS / NUM_E / NUM_P / NUM_BIN_2 / NUM_BIN_4 / NUM_BIN_8
timestamp	Message timestamp.	NUM_BIN_8 / TIMESTAMP
firstPolled	When the ackMode property is "MANUAL" or "MANUAL_IMMEDIATE" and the typeMsgHandling property is "BATCH", this key indicates if the message is the first message in the batch to handle.	BOOL
lastPolled	When the ackMode property is "MANUAL" or "MANUAL_IMMEDIATE" and the typeMsgHandling property is "BATCH", this key indicates if the message is the last message in the batch to handle.	BOOL
headers/keys	List of <key, value> pair keys included in the message header.	ALPHA(n) array
headers/values	List of <key, value> pair keys included in the message header. The native value type is a byte array.	ALPHA / IMAGE / REF_CLASS

Key value	Property description	Property type
Message from MQTT v3
topic	Name of the topic the message is from.	ALPHA(n)
id	Message ID.	NUM_BIN_4
duplicate	Specifies whether or not this message can be a duplicate of a message already received.	BOOL
retained	Returns whether or not this message has been retained by the broker. Specifies whether or not the message came from a running issuer or if it was "retained" by the broker as the last message published on the topic.	BOOL
qos	Returns the quality of service associated with the message (value 0, 1 or 2).	NUM_BIN_4

Key value	Property description	Property type
Message from MQTT v5
topic	Name of the topic the message is from.	ALPHA(n)
id	Message ID.	NUM_BIN_4
duplicate	Specifies whether or not this message can be a duplicate of a message already received.	BOOL
retained	Returns whether or not this message has been retained by the broker. Specifies whether or not the message came from a running issuer or if it was "retained" by the broker as the last message published on the topic.	BOOL
qos	Returns the quality of service associated with the message (value 0, 1 or 2).	NUM_BIN_4
properties
properties	Message properties.	N / A
properties/validProperties	List of the numbers of message properties defined for this message (see MqttProperties Java class).	NUM_BIN_2 array
properties/assignedClientIdentifier	Assigned client identifier (property number 18).	ALPHA(n)
properties/contentType	Message content type (property number 3).	ALPHA(n)
properties/correlationData	Correlation data (property number 9).	IMAGE
properties/payloadFormat	Message payload format (property number 1). If the value is true, the payload represents a character string encoded in UTF-8. If the value is false, the payload is raw data without a format (byte array).	BOOL
properties/messageExpiryInterval	Message expiry interval (property number 2). This value corresponds to the message lifespan in seconds. If the message expiry interval has passed and the broker has not managed to start delivery to a corresponding subscriber, it must delete the copy of the message for this subscriber.	NUM_BIN_8
properties/responseTopic	Name of topic for a response message (property number 8).	ALPHA(n)
properties/subscriptionIdentifier	Subscriber identifier (property number 11).	NUM_BIN_4
properties/topicAlias	Message topic alias (property number 35).	NUM_BIN_4
properties/userProperties	User properties (property number 38). List of <key, value> alphanumeric pairs. These properties can be used to provide additional information to the broker or client, including diagnostic information.	N / A
adelUtils:collectionSize(properties/userProperties)	Size of user properties list.	NUM_BIN_4
properties/userProperties[<index starting at 1>]/key	<index> index pair key field value in the user properties list.	ALPHA(n)
properties/userProperties[<index starting at 1>]/value	<index> index pair value field value in the user properties list.	ALPHA(n)

Key value	Property description	Property type
Message from Nats Jetstream
jetStream	Check if the message is from Jetstream or if it is a standard message (returns yes if the message is from Jetstream).	BOOL
sid	ID associated with the subscription, used by the connection when handling an incoming message from the broker.	ALPHA(n)
utf8mode	Specifies if the message subject is encoded in UTF-8.	BOOL
hasHeaders	Checks if the message contains header properties (returns true if the message contains them).	BOOL
subject	Subject to which the message was sent.	ALPHA(n)
replyTo	Subject to which the application is supposed to send a reply message.	ALPHA(n)
headers
headers	Key/values cross-reference table associated with the message. A key is alphanumeric type and the value is an alphanumeric list.	N / A
headers/size	Size of the key/values cross-reference table associated with the message (corresponds to the number of table entries).	NUM_BIN_4
headers/empty	Specifies if the key/values cross-reference table associated with the message is empty (size 0).	BOOL
headers/keySet	Returns the list of keys (corresponding to the entries in the key/values cross-reference table associated with the message).	ALPHA(n) array
headers/keySet[<index starting at 1>]	Returns the <index> index key value in the key list.	ALPHA(n)
headers/entrySet	Returns the list of <key, value> pairs included in the key/values cross-reference table associated with the message.	N / A
headers/entrySet[<index starting at 1]/key	Returns the value of the key associated with the <index> index pair in the list of <key, value> pairs.	ALPHA(n)
headers/entrySet[<index starting at 1]/value	Returns the value of the value field associated with the <index> index pair in the list of <key, value> pairs.	ALPHA(n) array

Key value	Property description	Property type
Message from RabbitMQ AMQP
envelope
envelope	Message envelope.	N / A
envelope/exchange	Name of exchange associated with the message.	ALPHA(n)
envelope/redeliver	Specifies if the message is redelivered.	BOOL
envelope/routingKey	Routing key associated with the message.	ALPHA(n)
basicProperties
basicProperties	Message properties.	N / A
basicProperties/contentType	Message payload content type.	ALPHA(n)
basicProperties/contentEncoding	Message payload content encoding.	ALPHA(n)
basicProperties/deliveryMode	Message delivery mode (persistent message or not). Value 1 indicates that this message is only stored in memory; value 2 indicates that it is stored on a disk.	NUM_BIN_4
basicProperties/priority	Message priority in the associated queue.	NUM_BIN_4
basicProperties/correlationId	Message correlation ID.	ALPHA(n)
basicProperties/replyTo	Name of the queue to use to reply to the message.	ALPHA(n)
basicProperties/expiration	Message lifespan in milliseconds.	ALPHA(n)
basicProperties/messageId	Message application ID.	ALPHA(n)
basicProperties/timestamp	Message application timestamp.	TIMESTAMP / TIME / DATE
basicProperties/type	Message application type.	ALPHA(n)
basicProperties/userId	ID of user who published the message.	ALPHA(n)
basicProperties/appId	ID of application that published the message.	ALPHA(n)

Key value	Property description	Property type
Message from Redis Pub/Sub
channel	Name of the channel the message is from	ALPHA(n)/IMAGE according to the value of the config/brokerConfig/subscribeTopic/redisCodec property.
pattern	Name of pattern the channel is deduced from.	ALPHA(n)/IMAGE according to the value of the config/brokerConfig/subscribeTopic/redisCodec property.

In an onError section

This instruction retrieves information relating to the error during processing.

ErrorInfoType	Property description	Property type
*ERROR_CODE	Error number	NUM_BIN_4
*IMMED_STOP	Specifies if the error will stop the subscriber (and trigger the execution of the onStop section).	BOOL
*ERROR_MSG	Error message	ALPHA(n)

The error depends on the execution context and therefore the broker (and the associated factory).

Error number	Error message	Immediate stop
Specific Kafka errors
-401	Error when creating the topic pattern.	Yes
-403	Error when handling the ON_START event: negative acknowledgment sent.	Yes
-501	Error when converting an Avro pojo to an Adelia pojo.	No

Error number	Error message	Immediate stop
Specific MQTT v3 errors
-401	Error when creating Paho MQTTv3 connection options based on the broker connection configuration.	Yes
-402	Error when creating the Paho MQTTv3 client using the options.	Yes
-403	Error when connecting the Paho MQTTv3 client to the broker.	Yes
-404	Error when subscribing the Paho MQTTv3 client to the topics.	Yes
-406	Error when handling the ON_START event: negative acknowledgment sent.	Yes
-501	Broker connection lost.	Yes
-502	Error when force disconnecting the Paho MQTTv3 client.	Yes
-503	Error when closing the Paho MQTTv3 client.	Yes

Error number	Error message	Immediate stop
Specific MQTT v5 errors
-401	Error when creating Paho MQTTv5 connection options based on the broker connection configuration.	Yes
-402	Error when creating the Paho MQTTv5 client using the options.	Yes
-403	Error when connecting the Paho MQTTv5 client to the broker.	Yes
-404	Error when subscribing the Paho MQTTv5 client to the topics.	Yes
-406	Error when handling the ON_START event: negative acknowledgment sent.	Yes
-501	Broker connection lost.	Yes
-502	Error when force disconnecting the Paho MQTTv5 client.	Yes
-503	Error when closing the Paho MQTTv5 client.	Yes

Error number	Error message	Immediate stop
Specific NATS JetStream errors
-401	Error when creating NATS connection options based on the broker connection configuration.	Yes
-402	Error when creating the NATS connection using the connection options.	Yes
-403	Error when creating JetStream subscription options based on the topic subscription configuration.	Yes
-404	Error when creating the JetStream context.	Yes
-405	Error when creating JetStream context options based on the broker connection configuration.	Yes
-406	Error when subscribing to JetStream broker topics.	Yes
-408	Error when handling the ON_START event: negative acknowledgment sent.	Yes
-501	Error when unsubscribing from JetStream broker topics.	Yes
-502	Error when closing the NATS connection to the broker.	Yes

Error number	Error message	Immediate stop
Specific RabbitMQ AMQP errors
-401	Error when configuring the SSL connection: key management exception for all operations concerning key management.	Yes
-402	Error when creating the AMQP connection.	Yes
-403	Error when creating the AMQP channel.	Yes
-404	Error when passively declaring the queue.	Yes
-405	Error when declaring the queue.	Yes
-406	Error during basic consumption in the queue.	Yes
-407	Error when calling channel.basicQos.	Yes
-408	Error when passively declaring the exchanger.	Yes
-409	Error when declaring the exchanger.	Yes
-410	Error when binding the queue.	Yes
-412	Error when handling the ON_START event: negative acknowledgment sent.	Yes
-501	Error when closing the channel.	Yes
-502	Error when closing the connection.	Yes
-503	Connection closure not initiated by the application.	Yes/No (after enabling automatic reconnection)
-504	The subscriber was cancelled by the broker.	Yes

Error number	Error message	Immediate stop
Specific Redis Pub/Sub errors
-401	Error when creating the Redis URI based on the broker connection configuration.	Yes
-402	Error when creating the ClientOptions/ClusterClientOptions options object based on the broker connection configuration.	Yes
-403	Error when creating the Pub/Sub connection to the Redis broker.	Yes
-404	Error when subscribing to broker channels and models.	Yes
-406	Error when handling the ON_START event: negative acknowledgment sent.	Yes
-501	Error when closing the connection to the Redis broker.	Yes
-502	Error when closing the Redis client.	Yes
-503	Lettuce Redis client closed due to loss of connection to the broker.	Yes
-504	Lettuce Redis client closed due to a communication error with the broker.	Yes

After this instruction has been executed, the *RETURN_CODE reserved word can take the following values:

*0 (NORMAL)**	Operation completed successfully.
-1	Internal error (no message or configuration).
-2	Internal error (no error).
-3	XPath syntax error when evaluating the Alpha PropertyName parameter.
-4	The reserved word parameter is not known.
-5	The key corresponds to information that does not exist or has no value.
-11	The value associated with the key cannot be converted to Adelia type.
-32	The result variable must be an ALPHA or REF_CLASS type variable.
-33	The ALPHA result variable is too short.
-53	The result variable must be a numeric variable.
-54	The NUM_E/NUM_P result variable is too small.
-55	The integer part of the NUM_E/NUM_P result variable is too small.
-56	The decimal part of the NUM_E/NUM_P result variable is too small.
-57	The result variable has a type which is incompatible with a numeric value.
-58	The NUM_BIN_2 result variable is too small.
-59	The NUM_BIN_4 result variable is too small.
-60	The NUM_BIN_8 result variable is too small.
-61	The value associated with the key cannot be converted to TIMESTAMP type.
-74	The result variable must be a Boolean variable.
-95	The result variable must be a DATE, TIME or TIMESTAMP variable.
-116	The result variable must be an IMAGE variable.
-117	The value associated with the key cannot be converted to a byte array.
-137	The resulting variable must be a REF_CLASS variable.
-138	The value associated with the key cannot be converted to an Adelia class.
-300	The result variable must be an array variable.
-301	The result variable must be a one-dimensional array variable.
-302	The array result variable is too small.
-303	The combo box items have a type that cannot be converted to a numerical value.
-304	The combo box items have a type that cannot be converted to an alphanumeric value.
-305	The combo box items have a type that cannot be converted to a Boolean value.
-306	The combo box items have a type that cannot be converted to an image value.
-307	The combo box items have a type that cannot be converted to an Adelia class value.
-308	The result variable type is not supported.
-309	The key's combo box items have a type that cannot be converted to a date/time/timestamp value.
-332	The result array variable must be ALPHA or REF_CLASS type.
-333	The alphanumeric length of the ALPHA result array variable is too short.
-353	The result array variable must be numeric.
-354	The NUM_E/NUM_P result array variable defines numerics that are too small.
-355	The NUM_E/NUM_P result array variable defines numerics with an integer part that is too small.
-356	The NUM_E/NUM_P result array variable defines numerics with a decimal part that is too small.
-357	The combo box items have a type that cannot be converted to a numerical value.
-358	The NUM_BIN_2 result array variable defines integers that are too small.
-359	The NUM_BIN_4 result array variable defines integers that are too small.
-360	The NUM_BIN_8 result array variable defines integers that are too small.
-361	The key's combo box items have a value that cannot be converted to TIMESTAMP type.
-374	The result array variable must be Boolean type.
-395	The result array variable must be date, time or timestamp type.
-416	The result array variable must be image type.
-417	The key's combo box items have a type that cannot be converted to a byte array.
-437	The result array variable must be REF_CLASS type.
-438	The key's combo box items have a type that cannot be converted to an Adelia class.
-600	The value associated with the key cannot be converted to Adelia type.
-621	The alphanumeric value associated with the key cannot be deserialized to an Adelia class.
-642	The numeric value associated with the key cannot be converted to Adelia numeric type.
-705	Error when retrieving the byte array from a ByteBuffer instance.
-706	The ByteBuffer instance has no accessible byte array.
-707	The byte array value associated with the key cannot be deserialized to an Adelia class.
-708	Invalid character encoding.
-709	Error when converting the payload to an alphanumeric string.
-900	The value associated with the key cannot be converted to Adelia type.
-1521	The alphanumeric value associated with the key cannot be deserialized to an Adelia class.
-1542	The numeric value associated with the key cannot be converted to Adelia numeric type.
-1605	Error when retrieving the byte array from a ByteBuffer instance.
-1606	The ByteBuffer instance has no accessible byte array.
-1607	The byte array value associated with the key cannot be deserialized to an Adelia class.
-1608	Character encoding is invalid for converting the byte array.
-1609	Error when converting a byte array value to an alphanumeric string.

For example

* Payload retrieved in the form of an Adelia class (onMessage)

REF_CLASS(COMMAND_ORDER) myCommand

BRK_GET_MSG myCommand

* Topic retrieved from a Kafka message (onMessage)

ALPHA(10) msgTopic

BRK_GET_MSG 'topic' msgTopic

* Error code retrieved (onError)

NUM_BIN_4 ambssError

BRK_GET_MSG ERROR_CODE ambssError

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