可以通过调用方法（例如启动a并发送消息时调用Scheduler）来触发输出消息，如以下示例所示：

Groovy DSL。 

def dsl = Contract.make {
	// Human readable description
	description 'Some description'
	// Label by means of which the output message can be triggered
	label 'some_label'
	// input to the contract
	input {
		// the contract will be triggered by a method
		triggeredBy('bookReturnedTriggered()')
	}
	// output message of the contract
	outputMessage {
		// destination to which the output message will be sent
		sentTo('output')
		// the body of the output message
		body('''{ "bookName" : "foo" }''')
		// the headers of the output message
		headers {
			header('BOOK-NAME', 'foo')
		}
	}
}

YAML。 

# Human readable description
description: Some description
# Label by means of which the output message can be triggered
label: some_label
input:
  # the contract will be triggered by a method
  triggeredBy: bookReturnedTriggered()
# output message of the contract
outputMessage:
  # destination to which the output message will be sent
  sentTo: output
  # the body of the output message
  body:
    bookName: foo
  # the headers of the output message
  headers:
    BOOK-NAME: foo

在前面的示例情况下，如果执行了称为bookReturnedTriggered的方法，则输出消息将发送到output。在消息发布者方面，我们生成了一个测试，该测试调用该方法来触发消息。在使用者方面，您可以使用some_label来触发消息。