Class: JDBCHelper::Connection::StatementPool

Inherits:
Object
  • Object
show all
Defined in:
lib/jdbc-helper/connection/statement_pool.rb

Instance Method Summary collapse

Constructor Details

#initialize(conn, max_size = 20) ⇒ StatementPool

Returns a new instance of StatementPool.



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# File 'lib/jdbc-helper/connection/statement_pool.rb', line 10

def initialize(conn, max_size = 20)
  @conn = conn
  @max_size = max_size # TODO
  @free = []
  @occupied = []
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/jdbc-helper/connection/statement_pool.rb', line 46

def close
  (@free + @occupied).each do | stmt |
    stmt.close
  end
  @conn = nil
  @free = []
  @occupied = []
end

#each ⇒ Object 



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# File 'lib/jdbc-helper/connection/statement_pool.rb', line 55

def each
  (@free + @occupied).each do | stmt |
    yield stmt
  end
end

#give(stmt) ⇒ Object

Raises:

  • (Exception) 


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# File 'lib/jdbc-helper/connection/statement_pool.rb', line 38

def give(stmt)
  raise Exception.new("Not my statement") unless
      @occupied.include? stmt

  @occupied.delete stmt
  @free << stmt
end

#take ⇒ Object 



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# File 'lib/jdbc-helper/connection/statement_pool.rb', line 25

def take
  if @free.empty?
    raise Exception.new("Nesting too deep") if
        @occupied.length >= @max_size
    @occupied << nstmt = @conn.send(:create_statement)
    nstmt
  else
    stmt = @free.pop
    @occupied << stmt
    stmt
  end
end

#with ⇒ Object 



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# File 'lib/jdbc-helper/connection/statement_pool.rb', line 17

def with
  begin
    yield stmt = take
  ensure
    give stmt
  end
end