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6.2. Component Contracts

Component Contract can be either a Component Service or a Component Reference. A Component Service is used to expose the functionality of an implementation as a service. A Component Reference allows a component to consume other services. A component contract can be defined in three different ways in SwitchYard:
  • Java: Using a Java interface.
  • WSDL: Using a port type in a WSDL file.
  • ESB: Using a virtual interface definition. (No real file is used).
A component contract in SwitchYard has the following characteristics. All are optional:
  • argument: If used, this is the message content. It is optional as there can be operations that don’t expect a message (for example, REST GET, Scheduled operations​). Used in Exchanges of type IN_ONLY and IN_OUT.
  • return type: If used, this is the message content for the response. Used only in Exchanges of type IN_OUT.
  • exceptions: If used, this is the message content for the response in case of an Exception. Used in Exchanges of type IN_ONLY and IN_OUT.
Note
Contracts in Camel can be defined with empty parameters, and users can still work with the message content.

Java contract

A Java contract is defined by a Java Interface.

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Note
Java components require Java contracts.

WSDL contract

A WSDL contract is defined by a port type in a WSDL file.

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ESB contract

An ESB contract is a virtual contract (no file required) that declares the types of the input, output and exception types.

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Note
ESB contract may be used in components with one single operation.
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