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Traditionally, when implementing a transaction service, a protocol is chosen and it remains the same during the system execution. Nevertheless, the dynamic nature of nowadays application contexts (e.g., mobile, ad-hoc, peer-to-peer) and behaviour variations (semantic-related aspects) motivates the needs for application adaptation. Next generation of system applications should be adaptive or even better self-adaptive. This paper proposes (1) a component-based architecture of standard 2PC-based protocols and (2) a self-Adaptive Component-based cOmmit Management, named ACOM. Self-adaptation is obtained by behaviour awareness and component-based reconfiguration. This allows ACOM to select the most appropriate protocol according to the context. We show that using ACOM performs better than using only one commit protocol in a variable system and that the reconfiguration cost can be negligible.