Files
spring-integration/spring-integration-core
Gary Russell 4365eaef6d GH-2770: AbstractMessageSource EvaluationContext
Fixes https://github.com/spring-projects/spring-integration/issues/2770

Only create an evaluation context for header expressions if we actually
have header expressions.

* Some `AbstractMessageSource` refactoring to avoid unnecessary code and
some optimization

**Cherry-pick to 5.1.x**
2019-02-28 12:46:16 -05:00
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