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Versions: 17
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Stored size: 1.38 KB
Contents
module Lev
class TransactionIsolation
def initialize(symbol)
raise IllegalArgument, "Invalid isolation symbol" if !@@symbols_to_isolation_levels.has_key?(symbol)
@symbol = symbol
end
def self.no_transaction; new(:no_transaction); end
def self.read_uncommitted; new(:read_uncommitted); end
def self.read_committed; new(:read_committed); end
def self.repeatable_read; new(:repeatable_read); end
def self.serializable; new(:serializable); end
def replace_if_more_isolated(other_transaction_isolation)
if other_transaction_isolation.isolation_level > self.isolation_level
self.symbol = other_transaction_isolation.symbol
end
self
end
def weaker_than(other)
self.isolation_level < other.isolation_level
end
def self.mysql_default
# MySQL default per https://blog.engineyard.com/2010/a-gentle-introduction-to-isolation-levels
repeatable_read
end
def ==(other)
self.symbol == other.symbol
end
def eql?(other)
self == other
end
attr_reader :symbol
protected
def isolation_level
@@symbols_to_isolation_levels[symbol]
end
@@symbols_to_isolation_levels = {
no_transaction: 0,
read_uncommitted: 1,
read_committed: 2,
repeatable_read: 3,
serializable: 4
}
attr_writer :symbol
end
end
Version data entries
17 entries across 17 versions & 1 rubygems