Executive Summary (This is a document excerpt)

Selecting an enterprise service bus (ESB) is challenging because the products themselves are complex; they combine many discrete capabilities, there are many products available, and the definition of an ESB continues to evolve. The core functions are common, so differentiators include such issues as the deployment topology, environmental dependencies, the style of included tooling, and the specific low-level protocols and other details associated with each individual product. At the same time, open source options are functionally viable, and their surrounding tools and features are maturing rapidly. Some lock-in is inevitable, so migrating between products is not a trivial undertaking. Understanding the function of an ESB and its role and fit in your particular environment is essential to making a sound selection.

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