PublishBatchRequestEntry -

PublishBatchRequestEntry

Contains the details of a single Amazon SNS message along with an Id that identifies a message within the batch.

Contents

Id

An identifier for the message in this batch.

Note

The Ids of a batch request must be unique within a request.

This identifier can have up to 80 characters. The following characters are accepted: alphanumeric characters, hyphens(-), and underscores (_).

Type: String

Required: Yes

Message

The body of the message.

Type: String

Required: Yes

MessageAttributes
MessageAttributes.entry.N.Name (key)
MessageAttributes.entry.N.Value (value)

Each message attribute consists of a Name, Type, and Value. For more information, see Amazon SNS message attributes in the Amazon SNS Developer Guide.

Type: String to MessageAttributeValue object map

Required: No

MessageDeduplicationId

This parameter applies only to FIFO (first-in-first-out) topics.

The token used for deduplication of messages within a 5-minute minimum deduplication interval. If a message with a particular MessageDeduplicationId is sent successfully, subsequent messages with the same MessageDeduplicationId are accepted successfully but aren't delivered.

  • Every message must have a unique MessageDeduplicationId.

    • You may provide a MessageDeduplicationId explicitly.

    • If you aren't able to provide a MessageDeduplicationId and you enable ContentBasedDeduplication for your topic, Amazon SNS uses a SHA-256 hash to generate the MessageDeduplicationId using the body of the message (but not the attributes of the message).

    • If you don't provide a MessageDeduplicationId and the topic doesn't have ContentBasedDeduplication set, the action fails with an error.

    • If the topic has a ContentBasedDeduplication set, your MessageDeduplicationId overrides the generated one.

  • When ContentBasedDeduplication is in effect, messages with identical content sent within the deduplication interval are treated as duplicates and only one copy of the message is delivered.

  • If you send one message with ContentBasedDeduplication enabled, and then another message with a MessageDeduplicationId that is the same as the one generated for the first MessageDeduplicationId, the two messages are treated as duplicates and only one copy of the message is delivered.

Note

The MessageDeduplicationId is available to the consumer of the message (this can be useful for troubleshooting delivery issues).

If a message is sent successfully but the acknowledgement is lost and the message is resent with the same MessageDeduplicationId after the deduplication interval, Amazon SNS can't detect duplicate messages.

Amazon SNS continues to keep track of the message deduplication ID even after the message is received and deleted.

The length of MessageDeduplicationId is 128 characters.

MessageDeduplicationId can contain alphanumeric characters (a-z, A-Z, 0-9) and punctuation (!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~).

Type: String

Required: No

MessageGroupId

This parameter applies only to FIFO (first-in-first-out) topics.

The tag that specifies that a message belongs to a specific message group. Messages that belong to the same message group are processed in a FIFO manner (however, messages in different message groups might be processed out of order). To interleave multiple ordered streams within a single topic, use MessageGroupId values (for example, session data for multiple users). In this scenario, multiple consumers can process the topic, but the session data of each user is processed in a FIFO fashion.

You must associate a non-empty MessageGroupId with a message. If you don't provide a MessageGroupId, the action fails.

The length of MessageGroupId is 128 characters.

MessageGroupId can contain alphanumeric characters (a-z, A-Z, 0-9) and punctuation (!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~).

Important

MessageGroupId is required for FIFO topics. You can't use it for standard topics.

Type: String

Required: No

MessageStructure

Set MessageStructure to json if you want to send a different message for each protocol. For example, using one publish action, you can send a short message to your SMS subscribers and a longer message to your email subscribers. If you set MessageStructure to json, the value of the Message parameter must:

  • be a syntactically valid JSON object; and

  • contain at least a top-level JSON key of "default" with a value that is a string.

You can define other top-level keys that define the message you want to send to a specific transport protocol (e.g. http).

Type: String

Required: No

Subject

The subject of the batch message.

Type: String

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: