hbase-shell/src/main/ruby/shell/commands/list_locks.rb

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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#     http://www.apache.org/licenses/LICENSE-2.0
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require 'json'

module Shell
  module Commands
    class ListLocks < Command
      def help
        <<-EOF
List all locks in hbase. Examples:

  hbase> list_locks
EOF
      end

      def command
        list = JSON.parse(admin.list_locks)

        list.each do |lock|
          formatter.output_strln("#{lock['resourceType']}(#{lock['resourceName']})")

          case lock['lockType']
          when 'EXCLUSIVE' then
            formatter.output_strln("Lock type: #{lock['lockType']}, " \
              "procedure: #{lock['exclusiveLockOwnerProcedure']}")
          when 'SHARED' then
            formatter.output_strln("Lock type: #{lock['lockType']}, " \
              "count: #{lock['sharedLockCount']}")
          end

          if lock['waitingProcedures']
            formatter.header(['Waiting procedures'])

            lock['waitingProcedures'].each do |waiting_procedure|
              formatter.row([waiting_procedure])
            end

            formatter.footer(lock['waitingProcedures'].size)
          end

          formatter.output_strln('')
        end
      end
    end
  end
end