Message Headers

Solace and Google Cloud Pub/Sub message headers can be created or manipulated using the User-Configured Header Transforms feature.

Solace Headers

Solace headers exposed to the connector are documented in the Spring Cloud Stream Binder for Solace PubSub+ documentation.

Message Header Mappings

The following Google Cloud Pub/SubPubsubMessage attributes are mapped to the following message properties:

Header Name Type Access Description

Header Name	Type	Access	Description
`gcp_pubsub_message_id`	`string`	Read	The ID of the message, assigned by the Google Cloud Pub/Sub service when the message is published. See Google Cloud Pub/Sub PubsubMessage.getMessageId().
`gcp_pubsub_publish_time`	`long(seconds)`	Read	The time at which the message was published, populated by the Google Cloud Pub/Sub service when it receives the Publish call. See Google Cloud Pub/Sub PubsubMessage.getPublishTime().
`gcp_pubsub_ordering_key`	`string`	Read	The Google Cloud Pub/Sub message’s ordering key. See Google Cloud Pub/Sub PubsubMessage.getOrderingKey().

gcp_pubsub_message_id

string

Read

The ID of the message, assigned by the Google Cloud Pub/Sub service when the message is published. See Google Cloud Pub/Sub PubsubMessage.getMessageId().

gcp_pubsub_publish_time

long(seconds)

Read

The time at which the message was published, populated by the Google Cloud Pub/Sub service when it receives the Publish call.

See Google Cloud Pub/Sub PubsubMessage.getPublishTime().

gcp_pubsub_ordering_key

string

Read

The Google Cloud Pub/Sub message’s ordering key. See Google Cloud Pub/Sub PubsubMessage.getOrderingKey().

The following Solace message headers marked with Read access are automatically forwarded to Google Cloud Pub/Sub messages, while headers with Write access can be set using the User-Configured Header Transforms feature.

Header Name	Type	Access	Description
`solace_applicationMessageId`	`string`	Read/Write	The application provided message ID.
`solace_applicationMessageType`	`string`	Read/Write	The application provided message type. This value is used by applications only.
`solace_correlationId`	`string`	Read/Write	The correlation ID for the message.
`solace_dmqEligible`	`boolean`	Write	Set the Solace message’s `dmqEligible`header.
`solace_expiration`	`long`	Write	Set the time at which the Solace message is set to expire.
`solace_priority`	`int`	Write	Set the Solace message’s priority.
`solace_senderId`	`string`	Read	The `Sender ID` for the Solace message.
`solace_senderTimestamp`	`long`	Read	The time at which the Solace message was published.
`solace_sequenceNumber`	`string`	Read	The application-defined sequence number set on the Solace message.

Reserved Message Headers

The following are reserved header spaces:

solace_
scst_
gcp_pubsub|goog
Any headers defined by the core Spring messaging framework. See Spring Integration: Message Headers for more info.

Any headers with these prefixes (that are not defined by the connector or any technology used by the connector) may not be backwards compatible in future versions of this connector.

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