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MuleESB / IBM Integration Bus (IIB) Interview questions

What are Environment and Local Environment trees in IBM Integration Bus?

Local Environment and Environment are message trees used by the message flow during message processing. The Lifetime of this tree structure may be throughout the flow or limited to some nodes. Use these trees to carry variables that need to be accessed in nodes throughout the flow.

Environment variable will live the whole thread lifetime of a flow. LocalEnvironment tree may or may not live throughout the thread lifetime. That means there is a mechanism that decides whether or not to pass the LocalEnvironment trees throughout the flow. The "Compute mode" property of a compute node will decide whether or not the local environment tree is copied to the downstream nodes of the flow.

If you want to send information using LocalEnvironment to the next immediate node, then set it in OutputLocalEnvironment. To access the information use InputLocalEnvironment. Whereas using Environment, we use the same variable to access or set information.

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