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Retry a block of code that might fail due to temporary errors.

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Octocat-spinner-32 lib
Octocat-spinner-32 test
Octocat-spinner-32 .document
Octocat-spinner-32 .gitignore
Octocat-spinner-32 Gemfile
Octocat-spinner-32 Guardfile
Octocat-spinner-32 LICENSE
Octocat-spinner-32 README.rdoc
Octocat-spinner-32 Rakefile
Octocat-spinner-32 VERSION
README.rdoc

rescue_me

Provides a convenience method to retry blocks of code that might fail due to temporary errors, e.g. a network service that becomes temporarily unavailable. The retries are timed to back-off exponentially (2^n seconds), hopefully giving time for the remote server to recover. These are the default wait times between consecutive attempts:

0, 1, 2, 4, 8, 16, 32, 64, 128, ... seconds

Usage:

rescue_and_retry(max_attempts, *temporary_exceptions) {
  # your code
}

Example - retry my code up to 7 times (over about a minute) if I see the following 2 network errors:

rescue_and_retry(7, Net::SMTPServerBusy, IOError) {
  smtp.send_message(message, from_address, to_address )
}

Log output:

WARN -- : rescue and retry (attempt 1/5): ./mailer.rb:43,  <SMTPServerBusy: 451 4.3.0 Mail server temporarily rejected message.>
WARN -- : rescue and retry (attempt 2/5): ./mailer.rb:43,  <SMTPServerBusy: 451 4.3.0 Mail server temporarily rejected message.>
WARN -- : rescue and retry (attempt 3/5): ./mailer.rb:43,  <SMTPServerBusy: 451 4.3.0 Mail server temporarily rejected message.>
# No further output or stacktrace. Block succeeded on 4th attempt.

Copyright

Copyright © 2010 Arild Shirazi. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY ARILD SHIRAZI “AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARILD SHIRAZI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those of the authors and should not be interpreted as representing official policies, either expressed or implied, of Arild Shirazi.

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