58 lines
2.1 KiB
Ruby
58 lines
2.1 KiB
Ruby
# Copyright (c) 2005 Jamis Buck
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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module DeadlockRetry
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def self.append_features(base)
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super
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base.extend(ClassMethods)
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base.class_eval do
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class <<self
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alias_method :transaction_without_deadlock_handling, :transaction
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alias_method :transaction, :transaction_with_deadlock_handling
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end
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end
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end
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module ClassMethods
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DEADLOCK_ERROR_MESSAGES = [
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"Deadlock found when trying to get lock",
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"Lock wait timeout exceeded"
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]
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MAXIMUM_RETRIES_ON_DEADLOCK = 3
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def transaction_with_deadlock_handling(*objects, &block)
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retry_count = 0
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begin
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transaction_without_deadlock_handling(*objects, &block)
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rescue ActiveRecord::StatementInvalid => error
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if DEADLOCK_ERROR_MESSAGES.any? { |msg| error.message =~ /#{Regexp.escape(msg)}/ }
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raise if retry_count >= MAXIMUM_RETRIES_ON_DEADLOCK
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retry_count += 1
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logger.info "Deadlock detected on retry #{retry_count}, restarting transaction"
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retry
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else
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raise
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end
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end
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end
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end
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end
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