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module Shell
  module Commands
    # Switch compaction for a region server
    class CompactionSwitch < Command
      def help
        <<~EOF
          Turn the compaction on or off on regionservers. Disabling compactions will also interrupt
          any currently ongoing compactions. This state is ephemeral. The setting will be lost on
          restart of the server. Compaction can also be enabled/disabled by modifying configuration
          hbase.regionserver.compaction.enabled in hbase-site.xml.
          Examples:
            To enable compactions on all region servers
            hbase> compaction_switch true
            To disable compactions on all region servers
            hbase> compaction_switch false
            To enable compactions on specific region servers
            hbase> compaction_switch true, 'server2','server1'
            To disable compactions on specific region servers
            hbase> compaction_switch false, 'server2','server1'
          NOTE: A server name is its host, port plus startcode. For example:
          host187.example.com,60020,1289493121758
        EOF
      end

      def command(enable_disable, *server)
        formatter.header(%w(['SERVER' 'PREV_STATE']))
        prev_state = admin.compaction_switch(enable_disable, server)
        prev_state.each { |k, v| formatter.row([k.getServerName, java.lang.String.valueOf(v)]) }
        formatter.footer(prev_state.size)
      end
    end
  end
end