Envelope

This formatter adds content to the beginning and/or end of a message.

Parameters

Prefix

Defines a string that is added to the front of the message. Special characters like n r or t can be used without additional escaping. By default this parameter is set to “”.

Postfix (default: n)

Defines a string that is added to the end of the message. Special characters like n r or t can be used without additional escaping. By default this parameter is set to “n”.

Parameters (from core.SimpleFormatter)

Source

This value chooses the part of the message the data to be formatted should be read from. Use “” to target the message payload; other values specify the name of a metadata field to target. By default this parameter is set to “”.

Target

This value chooses the part of the message the formatted data should be stored to. Use “” to target the message payload; other values specify the name of a metadata field to target. By default this parameter is set to “”.

ApplyTo

Use this to set Source and Target to the same value. This setting will be ignored if either Source or Target is set to something else but “”. By default this parameter is set to “”.

SkipIfEmpty

When set to true, this formatter will not be applied to data that is empty or - in case of metadata - not existing. By default this parameter is set to false

Examples

This example adds a line number and a newline character to each message printed to the console.

exampleProducer:
  Type: producer.Console
  Streams: "*"
  Modulators:
    - format.Sequence
    - format.Envelope