The sole role of this coordinator is to track the conversation across the multiple parties.

New Programming ModelTesting the actual composition of the individual elements is another important part of validating the system. Bottom-Up VisualizationLikening a loosely coupled system to "anarchy" might be a bit strong but the important aspect is that uncontrolled variability is supported and to some extend encouraged.
They will toss the drink if it has already been made or otherwise pull your cup from the "queue". The vendor list is typically composed of the usual suspects: Microsoft, IBM, BEA, Sun and smaller middleware and Web services vendors such as TIBCO, IONA, Arjuna and others.
For example, the answer to reliable asynchronous messaging might be to use JMS or MQ or another middleware that ensures guaranteed delivery of asynchronous messages.
Because channels are decoupled from the sender and receiver we can still use these channels to feed test data from a test data source. This model is commonly used to implement 2-phase commit protocols using a transaction coordinator.
For example, not knowing where SOAP messages come from and where they are going makes debugging and diagnostics very hard. There is also a specific command line syntax for each component. ObjectsEven though Pipes-and-Filters architectures exhibit some of the same properties as dependency injection models there is one important difference. Top-down ModelingI am a big fan of visual representation of systems.
This is only natural. These are exactly the issues the research papers deal with.
Compensating Action - The last option is to undo operations that were already completed to put the system back into a consistent state.