Module: Datafusion

Defined in:
lib/datafusion.rb,
lib/datafusion/version.rb,
lib/datafusion/db_executor.rb,
lib/datafusion/integrations.rb,
lib/datafusion/debug_executor.rb,
lib/datafusion/snippet_renderer.rb

Defined Under Namespace

Classes: DbExecutor, DebugExecutor, Integrations, SnippetRenderer

Constant Summary collapse

VERSION = 
"0.0.5"

Class Method Summary collapse

Class Method Details

.fuse(file, executor, opts) ⇒ Object 



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# File 'lib/datafusion.rb', line 20

def self.fuse(file, executor, opts)
  out = Integrations.render(file, opts)
  executor.execute(out, "integrations")
end

.log ⇒ Object 



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# File 'lib/datafusion.rb', line 11

def self.log
  @log ||= Logger.new(STDOUT)
  @log
end

.log=(logger) ⇒ Object 



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# File 'lib/datafusion.rb', line 16

def self.log=(logger)
  @log = logger
end

.refresh(file, executor, opts) ⇒ Object 



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# File 'lib/datafusion.rb', line 25

def self.refresh(file, executor, opts)
  schedules = Integrations.schedules(file)
  Datafusion.log.info("Discovered #{schedules.size} schedule(s).")
  
  scheduler = Rufus::Scheduler.new
  schedules.each do |schedule|
    scheduler.every(schedule["refresh"]) do
      #
      # TODO use refresh [..] concurrently
      #
      # This means we also need to define a unique index per materialized
      # view so that PG will know how to use MVCC.
      #
      # This needs some code to detect:
      # 1. At setup time - when an index is already there, don't add it.
      # 2. At refresh time - if a table doesn't have any data, it cannot be
      # refreshed with concurrently - it needs a normal refresh first.
      #
      # For now we refresh and block.
      #
      refresh_sql = "REFRESH materialized view #{schedule['name']}"
      
      executor.execute(refresh_sql, "schedule: #{schedule}")
    end
  end
  def scheduler.on_error(job, error)
    Datafusion.log.error("SCHEDULER: intercepted error in #{job.id}: #{error.message}")
  end
  scheduler
end