January 29, 2012
When implementing process automation initiatives, it is important to have a reuse strategy – why? Because, the process flows are a rich minefield for reusing services and common interfaces across a variety of use cases. It can also act as a service provider for other teams to invoke/integrate a common set of processing flows.
Host business process definitions and instances
- Provide a modeling and execution environment for designing and implementing business processes
- Implement a generic data structure for manipulating & orchestrating workflow state
- Provide the ability to reuse a workflow patterns across business processes. E.g. enable reuse via sub-processes, process extension points, etc.
- Provide the ability to access and orchestrate activities requiring interaction with data services and business rules, and legacy services
Act as services consumer & provider
- Host process orchestrations, while consuming persistence, validation, and security services
- Abstract legacy capabilities and reduce tight coupling between internal systems
- Publish and consume business events to reduce application to application coupling
Evolve a reusable asset catalog
- Ensure technology components and APIs have domain relevance – data, events, and relationships are fundamental abstractions need to be brought together
- Reduce learning curve for application developers to identify, evaluate, and integrate process definitions and services from a library of reusable assets
January 17, 2012
When service capabilities get reused across applications and processes, high availability becomes imperative – key question: do you detect availability issues before your clients do? This is important for several reasons:
- Unlike stand alone applications/processes, shared services impact several consumers. Not every consumer might be okay with your service being unavailable for an extended period of time. The same service might be in the critical path for some and not so much for others
- For some service capabilities, running them in a partial mode might be acceptable – e.g. operating out of a cached copy of data rather than fetching it from a live database, or servicing only read only operations during an unexpected outage, etc.
- Some consumers might have regulatory processes that are dependent on services being available – a service being unavailable might cause SLA breaches
Finally, consumer trust is key for systematic reuse – if they perceive service availability as a limiting factor, it will be harder to convince them to use services – including current and upcoming integrations
January 7, 2012
Systematic reuse in the context of enterprise integration provides several benefits:
- allows the team to evolve consistent set of data interfaces across integration efforts – if multiple systems need to integrate with yours, can you define a generic data model for your domain-specific concepts? This could be file layout(s), service interface schemas, or platform specific APIs
- enables common interfaces for domain specific services and business processes
- integration points often need cross-cutting concerns such as logging, transaction management, exception handling, etc. that can be reused
- reusable utilities can help with support and testing tools – for instance, reply failed messages, drain message queues/topics, generate high volume test data, etc.
Question is – are your teams taking advantage of integration points? or is each integration point implementing identical or similar functionality in an inconsistent fashion?
January 1, 2012
Tip #29 – Automate Documentation on Reusable Assets
Happy new year 2012
What is one key reason developers have a difficult time finding and evaluating existing assets? Lack of robust documentation including what the reusable asset isn’t meant to do. Though it is a critical success factor, maintaining documentation manually is a time consuming task and is the first item that gets left out when the development team is racing to meet a deadline. It will be useful to generate documentation on service clients or library client code snippets alongside the provider code. Automate documentation as much as possible – this will come in handy when fixing bugs, integrating new consumers, as well as integrating documentation within IDEs. Here are a few examples of doing this:
- Maven javadoc plugin for example can generate javadoc style HTML documentation for various java and web modules
- Maven site deploy can be used to publish generated artifacts to a remote host
- XSL stylesheets can be used to generate HTML documentation from XML schemas (XSDs) – this can be handy when exposing reusable services (e.g. using XS3P)