IBM Systems Magazine, Mainframe - September/October 2016 - 28

resource with query parameters
and action verbs such as GET,
PUT and DELETE-with JSON
payload. A macro API call, such
as /getCustomerDetail, can
be decomposed into several
microservices, including
/getCustomer, /getAccounts,
/getBalances, /getCreditScore,
/getCards and /getLoans. The
orchestration layer can combine
the results to return the response
for the macro API.
Many core components of
systems of integration (see
Figure 1, right) enable this
microservices architecture.
A catalog of macroservices
provides API access to business
services using a RESTful interface.
Creating, publishing, socializing,
managing the API lifecycle,
metering, billing and governance
of these services can be managed
in this layer. Applications running
in SoEs request these services
and, based on their predefined
service level agreement, obtain
responses in a prioritized fashion.
The application layer consists
of a component assembly layer
that provides orchestration by
composing the macro API call
from the catalog using a list of
microservices that are then served
by the SoR APIs or reference data
(master data management) APIs.
The compensation layer provides
transaction integrity so that if any
of the microservices fail to return
a response, a rollback action is
executed to revert the back end to
a consistent state.
The data layer hub provides
an interface to send the microservice RESTful requests straight
to the SoRs that are served by
IBM z/OS* Connect Enterprise
Edition (zCEE). zCEE works on
the Liberty profile that runs
mostly in specialty z Systems*
Integrated Information Processors, co-located with the SoRs. It
does the heavy lifting of convert-

Figure 1: Systems of Integration

Figure 2: Benefits of Caching for a Banking Workload

ing native connection requests
to z/OS middleware (e.g., CICS*,
IMS* and DB2*) and batch to
RESTful APIs with Swagger 2.0
support and JSON payloads. It
also provides caching functionality of the microservices served by
IBM WebSphere* eXtreme Scale
to ensure prefetched responses
have been stored in the cache
from prior calls. These calls
can be directly returned from
the midtier, providing resource
savings and response time benefits. The content in the cache
can have a predefined expiration
interval and be automatically
flushed and repopulated on the
next API call.

28 // SEPTEMBER/OCTOBER 2016 ibmsystemsmag.com

For regulatory purposes,
audit trails must be maintained
for all create, read, update and
delete transactions implemented
through the microservice API
calls. An innovative use of
blockchain is implementing a
security-as-a-service layer. The
immutable chain is a great data
structure for audit trail data stored
in a SoftLayer* public cloud using
an encrypted IBM Cloud Object
Storage powered by Cleversafe*
technology. The metadata for
audit trails, such as hash IDs of
the sequence, the time stamp
and the block ID, can be stored
on-premises using DB2 z/OS in
the highly secured SoR tier.


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IBM Systems Magazine, Mainframe - September/October 2016

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - September/October 2016

Table of Contents
Editor's Desk: Mitigating money matters
IBM Perspective: Linux on z Systems provides financial industry a foundation for blockchain
Partner PoV: Virtualization helps improve time to market and data center operations
IT Today: Blockchain's potential extends beyond the financial industry
Case Study: The Right Tools: Educational Testing Service streamlines application calls and improves PCI compliance
Cover Story: Process Transformation: Blockchain brings speed, security and transparency to business
Feature: A Modern System: IBM midtier solutions exploit API and microservices to drive innovation
Special Report: Mainframe Security Survey: Unauthorized users and external hackers are top concerns cited in survey
Tech Corner: Create a DevOps pipeline for Java applications in CICS
Solutions: zVT Control Center, dbDefender DAM Agent for DB2
Stop Run: IBM software engineer balances his day job with acting
Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - September/October 2016 - Intro
IBM Systems Magazine, Mainframe - September/October 2016 - Cover1
IBM Systems Magazine, Mainframe - September/October 2016 - Cover2
IBM Systems Magazine, Mainframe - September/October 2016 - 1
IBM Systems Magazine, Mainframe - September/October 2016 - Table of Contents
IBM Systems Magazine, Mainframe - September/October 2016 - 3
IBM Systems Magazine, Mainframe - September/October 2016 - 4
IBM Systems Magazine, Mainframe - September/October 2016 - 5
IBM Systems Magazine, Mainframe - September/October 2016 - Editor's Desk: Mitigating money matters
IBM Systems Magazine, Mainframe - September/October 2016 - 7
IBM Systems Magazine, Mainframe - September/October 2016 - IBM Perspective: Linux on z Systems provides financial industry a foundation for blockchain
IBM Systems Magazine, Mainframe - September/October 2016 - 9
IBM Systems Magazine, Mainframe - September/October 2016 - Partner PoV: Virtualization helps improve time to market and data center operations
IBM Systems Magazine, Mainframe - September/October 2016 - 11
IBM Systems Magazine, Mainframe - September/October 2016 - 12
IBM Systems Magazine, Mainframe - September/October 2016 - IT Today: Blockchain's potential extends beyond the financial industry
IBM Systems Magazine, Mainframe - September/October 2016 - 14
IBM Systems Magazine, Mainframe - September/October 2016 - 15
IBM Systems Magazine, Mainframe - September/October 2016 - Case Study: The Right Tools: Educational Testing Service streamlines application calls and improves PCI compliance
IBM Systems Magazine, Mainframe - September/October 2016 - 17
IBM Systems Magazine, Mainframe - September/October 2016 - 18
IBM Systems Magazine, Mainframe - September/October 2016 - 19
IBM Systems Magazine, Mainframe - September/October 2016 - Cover Story: Process Transformation: Blockchain brings speed, security and transparency to business
IBM Systems Magazine, Mainframe - September/October 2016 - 21
IBM Systems Magazine, Mainframe - September/October 2016 - 22
IBM Systems Magazine, Mainframe - September/October 2016 - 23
IBM Systems Magazine, Mainframe - September/October 2016 - 24
IBM Systems Magazine, Mainframe - September/October 2016 - 25
IBM Systems Magazine, Mainframe - September/October 2016 - Feature: A Modern System: IBM midtier solutions exploit API and microservices to drive innovation
IBM Systems Magazine, Mainframe - September/October 2016 - 27
IBM Systems Magazine, Mainframe - September/October 2016 - 28
IBM Systems Magazine, Mainframe - September/October 2016 - 29
IBM Systems Magazine, Mainframe - September/October 2016 - 30
IBM Systems Magazine, Mainframe - September/October 2016 - Special Report: Mainframe Security Survey: Unauthorized users and external hackers are top concerns cited in survey
IBM Systems Magazine, Mainframe - September/October 2016 - 32
IBM Systems Magazine, Mainframe - September/October 2016 - 33
IBM Systems Magazine, Mainframe - September/October 2016 - 34
IBM Systems Magazine, Mainframe - September/October 2016 - 35
IBM Systems Magazine, Mainframe - September/October 2016 - 36
IBM Systems Magazine, Mainframe - September/October 2016 - 37
IBM Systems Magazine, Mainframe - September/October 2016 - 38
IBM Systems Magazine, Mainframe - September/October 2016 - 39
IBM Systems Magazine, Mainframe - September/October 2016 - 40
IBM Systems Magazine, Mainframe - September/October 2016 - 41
IBM Systems Magazine, Mainframe - September/October 2016 - Tech Corner: Create a DevOps pipeline for Java applications in CICS
IBM Systems Magazine, Mainframe - September/October 2016 - 43
IBM Systems Magazine, Mainframe - September/October 2016 - 44
IBM Systems Magazine, Mainframe - September/October 2016 - 45
IBM Systems Magazine, Mainframe - September/October 2016 - Solutions: zVT Control Center, dbDefender DAM Agent for DB2
IBM Systems Magazine, Mainframe - September/October 2016 - 47
IBM Systems Magazine, Mainframe - September/October 2016 - Stop Run: IBM software engineer balances his day job with acting
IBM Systems Magazine, Mainframe - September/October 2016 - Cover3
IBM Systems Magazine, Mainframe - September/October 2016 - Cover4
IBM Systems Magazine, Mainframe - September/October 2016 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - September/October 2016 - SE1
IBM Systems Magazine, Mainframe - September/October 2016 - SE2
IBM Systems Magazine, Mainframe - September/October 2016 - SE3
IBM Systems Magazine, Mainframe - September/October 2016 - SE4
IBM Systems Magazine, Mainframe - September/October 2016 - SE5
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