Move expired messages to DLC

[abeykoon]

Purpose

New Improvement : Move expired messages to DLC

To enable edit [MB_HOME]/repository/conf/broker.xml file and define below parameter.

<performanceTuning> ...
     <messageExpiration> ...
        <moveExpiredMessagesToDLC> true </moveExpiredMessagesToDLC>

Goals

Fixes : wso2/product-ei#1914

Approach

Read a global setting from broker.xml to control the behavior.

User stories

Expired messages should not be deleted. They should be move into Dead Letter Channel instead.

Release note

Feature : expired messages are not removed, but routed to DLC. You can restore them back with expiry time reset.

Documentation

Refer above

Training

Move expired messages to DLC and see.

Certification

N/A

Marketing

N/A

Automation tests

• Unit tests

  Code coverage information

• Integration tests

  Details about the test cases and coverage

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes/no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Related PR

https://github.com/wso2/carbon-business-messaging/pull/624