In Memory Message Store is the default Message Store that will be created if user does not specify any implementation from the configuration. Messages will be stored in an in-memory queue. So in case of a ESB restart, all the messages stored will be lost.
In Memory Message Store is lot more faster than any persistence message store implementations. So it can be used as a temporary storage of messages for use cases such as implementation of high speed store and forwarded patterns where message persistence is not a requirement.
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