If everything is loosely coupled to everything else, it becomes impossible to understand in which direction messages actually flow. This can complicate testing, debugging, and maintenance. A number of tools can help alleviate this problem. First, we can use the Message History (551) to inspect messages at runtime and see which components they traversed. Alternatively, we can compile a list of all channels to which each component in the system subscribes or publishes. With this knowledge we can draw a graph of all possible message flows across components. Many EAI packages maintain channel
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