Implanta¸c˜ ao de Web services no servidor

Todo Web service implantado no servidor de aplica¸c˜oes ´e automaticamente habilitado a par- ticipar de uma transa¸c˜ao distribu´ıda. Ou seja, n˜ao ´e necess´aria nenhuma modifica¸c˜ao no procedi- mento de implanta¸c˜ao para que um Web service possa participar de transa¸c˜oes distribu´ıdas. Isso ocorre porque existe, do lado servidor, um interceptador transacional que atua sobre as requisi¸c˜oes SOAP que chegam ao servidor. Esse interceptador extrai o contexto transacional, retoma (ou cria) a transa¸c˜ao, e s´o ent˜ao permite que a requisi¸c˜ao prossiga para a implementa¸c˜ao do Web service.

Um usu´ario pode, entretanto, definir uma configura¸c˜ao personalizada que exclui o intercep- tador transacional da cadeia de interceptadores de um Web service. Isso pode ser ´util para Web services que n˜ao desejem participar de transa¸c˜oes distribu´ıdas e que portanto n˜ao precisam ser penalizados pela sobrecarga gerada pelo interceptador transacional.

5 Pr´oximas etapas

Apresentamos a seguir uma lista com as pr´oximas atividades programadas:

1. Desenvolvimento das vers˜oes ass´ıncronas de WS-Coordination e WS-AtomicTransaction. 2. Implementa¸c˜ao de suporte a logging e recupera¸c˜ao de falhas para recursos acess´ıveis como

Web services.

3. Desenvolvimento de testes, refatora¸c˜ao e aprimoramento da implementa¸c˜ao.

4. Realiza¸c˜ao testes de interoperabilidade entre o nosso servi¸co e o JBoss Transactions.

5. Estudo sobre o servi¸co de transa¸c˜oes de CORBA. Compara¸c˜ao conceitual com WS-Coordi- nation e WS-AtomicTransaction.

6. Elabora¸c˜ao e execu¸c˜ao de testes de desempenho entre os servi¸cos de transa¸c˜oes CORBA e Web services.

7. Reda¸c˜ao da disserta¸c˜ao. 8. Reda¸c˜ao de artigo. 9. Defesa.

5.2 Cronograma

O cronograma para as pr´oximas atividades segue abaixo: 2006/2007

jul ago set out nov dez jan fev

1 • • 2 • • 3 • • 4 • 5 • 6 • • 7 • • 8 • 9 •

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