FTWeb: A Fault Tolerant Infrastructure for Web Services

A QoS-aware fault tolerant middleware for dependable service composition

“…Sequential strategies have been employed in FT-SOAP [7] and FT-CORBA [24]; 2) parallel strategies, where all the candidates are invoked at the same time. Parallel strategies have been employed in FTWeb [22], Thema [14] and WS-Replication [20]. In this paper, we not only provide systematic introduction on the commonly-used fault tolerance strategies, but also propose a scalable middleware framework for dynamic fault tolerance strategy reselection and reconfiguration to deal with the frequently context information changes.…”

“…Step 4 (lines [18][19][20][21][22][23][24][25][26]: If the initial solution can not meet the global constraints (denoted as infeasible solution), then the f indExchangeCandidate() function, which is shown in Algorithm 5, is invoked to find an exchangeable candidate which meets the following three requirements:…”

Providing dependability for web services

“…Santos et al [9] have proposed a fault tolerant infrastructure for Web Services called FTWEB. This infrastructure is based on the FT-CORBA specification [FT-CORBA2002].…”

“…According to several literature sources [8,4,9,7,5], fault tolerance in Web Services can be defined as the capacity of providing the requested service in the presence of faults. Fault tolerance techniques can be used to improve Web Services dependability.…”

Ontology Supported Selection of Versions for N-Version Programming in Semantic Web Services

“…Our work differs in that we use semantic selection of different versions of a web service, additionally, we propose rules for service selection to achieve best dependability results. Santos et al [9] propose a fault tolerant infrastructure that is based on FTCorba architecture. Similarly to the previous work, the solution does not concern semantic information and does not select services from available ones.…”