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|
module ActiveRecord
module ConnectionAdapters
class StatementPool # :nodoc:
include Enumerable
DEFAULT_STATEMENT_LIMIT = 1000
def initialize(statement_limit = nil)
@cache = Hash.new { |h, pid| h[pid] = {} }
@statement_limit = statement_limit || DEFAULT_STATEMENT_LIMIT
end
def each(&block)
cache.each(&block)
end
def key?(key)
cache.key?(key)
end
def [](key)
cache[key]
end
def length
cache.length
end
def []=(sql, stmt)
while @statement_limit <= cache.size
dealloc(cache.shift.last)
end
cache[sql] = stmt
end
def clear
cache.each_value do |stmt|
dealloc stmt
end
cache.clear
end
def delete(key)
dealloc cache[key]
cache.delete(key)
end
private
def cache
@cache[Process.pid]
end
def dealloc(stmt)
raise NotImplementedError
end
end
end
end
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