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Status Not under consideration
Workspace CICS Transaction Server for z/OS
Categories Runtime
Created by Guest
Created on Jun 30, 2017

RELATED IDEAS

Phasein of Java bundles in an environment with different bundles and dependencies between these bundles

FI is going to modernize its backend application, that means it will migrate its programs step by step to Java. As runtime Environment we use CICS TS. CICS TS supports the Integration of Cobol and Java. Currently we deploy our Java part in one CICS bundle but the more applications we migrate to Java the more difficult is it to handle this. One crucial aspect in our installation is that we need the possibility to exchange new application versions without any interruption. This is possible with Cobol programs (phasein) and one Java bundle but not with different Java bundles which have dependencies. This currently prohibits that we separate our Java applications on different bundles. The Details: CICS uses CICS bundles for managing OSGi bundles in JVM-Server. When a CICS bundle is enabling or disabling the associated OSGi bundles are starting or stopping.
With CICS version 5.3 the system supports the deployment of new versions of OSGi bundles without service outages and CICS resource changes with the command "SET BUNDLE (data-value) COPY (PHASEIN)". It results in setting a new OSGi Bundle into ACTIVE state and the old one into RESOLVED state. The command acts for all OSGi bundles in the CICS bundle.

When stopping an OSGi bundle that exports packages the package wiring of dependant OSGi bundles remains to the old OSGi bundle. Actually there is no way to refresh the wiring of dependant OSGi bundles, because CICS does not support this part of the OSGi bundle lifecycle anywhere.

It is clear that the refresh method on a stopped OSGi bundle can produce undesireable effects, because the dependant OSGi bundles are determined just in time and then stopped, new resolved and started frequently. So service outage would occur.
On the other hand in a strong designed application it would be requested to deploy a new version of an OSGi bundle with service outage accepted or well handled.

Proposal:

SET BUNDLE (data-value-1) REFRESH (data-value-2)

data-value-1 specifies the CICS bundle
data-value-2 specifies the OSGi bundle in RESOLVED state

The command does operate on a specified OSGi bundle in a CICS bundle. It executes the refresh method on an OSGi bundle, which has to be in the RESOLVED state.

Idea priority Urgent
  • Guest
    Reply
    |     Nov 1, 2017

    Whilst this requirement is valid, based on our current plans and priorities, it is not likely that this could be implemented in the next 12 months, or in the next CICS TS release. Correspondingly this requirement is being declined at this point. The requirement will be kept in the RFE system and might be reassessed in the future. You also have an opportunity to resubmit in twelve months time if you wish it to be reconsidered then.

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