SubstitutingSourceProvider and Maps / Lists

[Matthew Faulkner]

Hi,

I'm using SubstitutingSourceProvider to read configuration from env 
variables. How can I define a map with a variable number of entries? 

For example, my config looks like this

activeMQConnections:

  broker1:

      brokerUrl: tcp://localhost:61616

  broker2:

      brokerUrl: tcp://anotherhost:61616


But I need to be able to read from the env variables similar to this:


activeMQConnections:

  ${broker1}:

      brokerUrl: ${broker1Url}

      brokerUsername: ${broker1Username}

      pool:

         maxConnections: ${broker1MaxConnections}

  ${broker2}:

      brokerUrl: ${broker2Url}

  ......

  ......

  ${brokerN}:

      brokerUrl: ${brokerNUrl}

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