Title     Using the Strategy Design Pattern to Compose
          Reliable Distributed Protocols
 
Authors   Beno\^{\i} Garbinato, Pascal Felber, Rachid Guerraoui
              ^^^^^^ (-> read as if you were a LaTeX compiler... ;-)
 
Contact   Benoit Garbinato
          Laboratoire de Systemes d'Exploitation (LSE)
          Departement d'Informatique (DI)
          Ecole Polytechnique Federale de Lausanne (EPFL)
          CH-1015 Lausanne
          (Switzerland)
 
          phone    + 41 21 693 52 74
          fax      + 41 21 693 67 70
          e-mail   garbinato@lse.di.epfl.ch
 
Abstract.
 
When building reliable distributed systems, one has to deal with many
complex protocols, e.g., failure detection, distributed consensus,
atomic commitment, and being able to reuse robust protocol implementa-
tions based on well-tested code is a key feature. In this context,
flexible composition of reliable distributed protocols is a central
concept, because it allows to customize complex protocols and to build
new protocols from existing ones. This paper describes how the Strategy
design pattern has been extensively used to support protocol composition,
where inheritance alone was not adequate.