As we work with our enterprise customers and prospects on CICS integration opportunities, we’re increasingly hearing about IBM® z/OS® Connect. The question we’re getting is simple: aren’t HostBridge and IBM® z/OS® Connect competing solutions? If so, why would an enterprise IT organization choose one over the other?
On the surface, it does appear as if these solutions compete. The IBM website says this: “IBM® z/OS® Connect Enterprise Edition provides a framework that enables z/OS based programs and data to participate fully in the new API economy for mobile and cloud applications.” At HostBridge, we use similar language to describe the HostBridge value proposition, so it’s easy to understand why z/OS shops are confused about the differences.
HostBridge has a long-standing partnership with the IBM, and we have for decades engaged various IBM product management teams to share our sometimes not-so-humble opinion of the best ways for CICS to participate in hybrid IT. From these discussions and our analysis, we’ve discovered two, significant differences between HostBridge and IBM® z/OS® Connect:
- IBM® z/OS® Connect can only invoke a single LINKable program in CICS.
- The primary value add of IBM® z/OS® Connect still seems to be the transformation of external data representations (e.g. JSON) to internal representations (e.g. a COBOL copybook).
Let’s explore these differences to see why they might matter.
Invoking a LINKable Program in CICS
The limitation of only being able to invoke a single, LINKable program in CICS matters because it forces orchestration to occur outside of CICS. To understand why this is so important, let’s first look at what orchestration is, and the impact of where it runs.
In the two decades that HostBridge has helped enterprises make CICS applications available via an API or as a service, we’ve learned this: much of the time, the need isn’t simply to provide an interface to a CICS application, but to orchestrate the interaction a human operator was originally intended to do. For example, the case study about Bank of Ayudhya perfectly describes this orchestration use case.
Intellyx president and analyst Jason Bloomberg, in his recent post, “Integration Idées Fortes on the Mainframe: Stronger than Ever” shares why where the orchestration layer runs matters: performance. Most enterprises aren’t willing to see response times for core business applications go from milliseconds to seconds because the integration and orchestration layer runs off the host. When orchestration occurs outside of CICS, the latency goes up. For this reason, HostBridge has long advocated doing integration and orchestration inside of CICS. A recent benchmark reveals the performance differences that result from where this layer resides.
The Transformation of External Data Representations
A not-so-secret rule of building robust, high-performing integrations to host applications is to not do any more transformations than are necessary. In our discussions with members of the IBM® z/OS® Connect team, they shared that one of the primary value-adds of z/OS® Connect is the transformation of external data representations (i.e., JSON) to internal representations (e.g., COBOL copybook). Okay. However, HB.js processes native JSON (as does Node.js). Transforming JSON-to-Copybook in order to invoke a script would add cost and inefficiency to the integration and orchestration process. HostBridge users would have to convert the copybook back to JSON to work with it.
We have customers that use z/OS® Connect and HostBridge, but not together. However, they would like to. All that is required is for z/OS® Connect to support a “transparent” mode in the solution that does JSON-to-JSON mapping. If IBM perceives that the true value of this solution is transforming data from JSON-to-Copybook instead of facilitating robust integration and orchestration work, we’ll probably not see this feature. However, we feel that a JSON-to-JSON mapping feature in z/OS® Connect would add value to enterprises that need to do on-host orchestration to minimize latency.
Different Horses for Different Courses
Given the current status of z/OS® Connect and HostBridge, here are the recommendations we’re giving to anyone who wants to use either product to help accomplish integration and/or orchestration for CICS applications:
- If your existing business logic is accessible through a single, LINKable program that you can invoke as the implementation of a service, then z/OS® Connect is a great solution.
- If you need to implement a service based on a variety of CICS application or data artifacts, the z/OS® Connect is not the ideal solution. In this environment, developing a service using HB.js that runs inside CICS will provide the best performance.
As it stands today, z/OS® Connect is unable to front-end HB.js because it insists on mapping data flows. We would love for IBM to recognize the value of a “transparent” JSON-to-JSON feature so that enterprises can use these two powerful solutions together. Regardless of what happens in this space, HostBridge and z/OS® Connect are NOT competing solutions. They truly are different horses for different courses.