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SOA Principles – Statelessness
This means a service must do its best to hold onto state information pertaining to an interaction for as small a duration as possible, e.g., do not retain awareness of a message once it is processed.
Statelessness in a service means that if the service is enlisted in a flow, than it doesn’t retain any state referring to the enclosing flow. Form a message perspective, it means that once a service has received and processed a message, it doesn’t retain memory of the passage of that message.