Gary Russell 5f450ed959 INT-4212: FileWritingMessageHandler.flushWhenIdle ...

JIRA: https://jira.spring.io/browse/INT-4212

Add an option to flush after the `flushInterval`, regardless of intermediate writes.

Rename `lastFlush` to `firstWrite`

Polishing

**Cherry-pick to 4.3.x**

2017-01-23 09:50:41 -05:00

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src

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test

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