Split cache config file support in 12.1.2?

Question

With 3.7.1 you could use the coherence-common library from incubator 11 to split cache config files.
This was done with the introduce-cache-config XML element:
<?xml version="1.0"?>
<cache-config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.oracle.com/coherence/coherence-cache-config"
xsi:schemaLocation="http://xmlns.oracle.com/coherence/coherence-cache-config coherence-cache-config.xsd"
xmlns:element="class://com.oracle.coherence.environment.extensible.namespaces.XmlElementProcessingNamespaceContentHandler"
element:introduce-cache-config="cache-config-1.xml, cache-config-2.xml, cache-config-3.xml">
</cache-config>
But this will not be available in incubator 12, the classes used for that will not be ported from incubator 11 (Coherence 3.7.x) to incubator 12 (Coherence 12.x):
http://coherence.oracle.com/download/attachments/14188570/Incubator+Update.pdf?version=2&modificationDate=1353937318977
How to achieve this with 12.1.2?

Answer 1

Hi,
It is still possible to do this as I did it with the 12.1.2 beta and a beta of Incubator 12 so unless either of those changed at the last minute you should be able to still import cache configuration files.
The top of your XML needs to look something like this...
<?xml version="1.0"?>
<cache-config xmlns="http://xmlns.oracle.com/coherence/coherence-cache-config"
              xmlns:element="class://com.oracle.coherence.common.namespace.preprocessing.XmlPreprocessingNamespaceHandler"
              element:introduce-cache-config="config/cluster.xml">
where this file is importing the "config/cluster.xml" file.
If you use custom name spaces in you configuration files then there is a bit more work to do as the XmlPreprocessingNamespaceHandler only knows how to merge the standard Coherence XML so you need to add extra code to you own namespace handlers. Specifically you need to implement...
public void mergeConfiguration(ProcessingContext processingContext, String sFromURI, XmlElement element, XmlElement xmlIntoCacheConfig, QualifiedName originatedFrom)
In the implementation you need to merge your custom XML (the element parameter) across to the main XML (the xmlIntoCacheConfig parameter). A very simple implementation of this would be...
@Override
public void mergeConfiguration(ProcessingContext processingContext, String sFromURI, XmlElement element, XmlElement xmlIntoCacheConfig, QualifiedName originatedFrom) {
    // clone the element to merge
    XmlElement xmlMergeElement = (XmlElement) element.clone();
    // annotate the origin of the merging element
    xmlMergeElement.addAttribute(originatedFrom.getName()).setString(sFromURI);
    // Add the cloned element to the XML configuration
    xmlIntoCacheConfig.getElementList().add(xmlMergeElement);
JK