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The in-memory repository connector is a simple connector that creates a transient, in-memory repository. This repository is used as a very simple in-memory cache or as a standalone transient repository. This connector works well for a readable and writable repository source with small to moderate sized content that need not be permanently saved.
The InMemoryRepositorySource class provides a number of JavaBean properties that control its behavior:
Table 12.1. InMemoryRepositorySource properties
| Property | Description |
|---|---|
| defaultCachePolicy | Optional property that, if used, defines the default for how long this information provided by this source may to be cached by other, higher-level components. The default value of null implies that this source does not define a specific duration for caching information provided by this repository source. |
| defaultWorkspaceName | Optional property that is initialized to an empty string and which defines the name for the workspace that will be used by default if none is specified. |
| jndiName | Optional property that, if used, specifies the name in JNDI where an InMemoryRepository instance can be found.
This is an advanced property that is infrequently used. |
| name | The name of the repository source, which is used by the RepositoryService when obtaining a RepositoryConnection by name. |
| rootNodeUuid | Optional property that, if used, defines the UUID of the root node in the in-memory repository. If not used, then a new UUID is generated. |
| retryLimit | Optional property that, if used, defines the number of times that any single operation on a RepositoryConnection to this source should be retried following a communication failure. The default value is '0'. |
One way to configure the in-memory connector is to create JcrConfiguration instance with a repository source that uses the InMemoryRepositorySource class.
For example:
JcrConfiguration config = ...
config.repositorySource("IMR Store")
.usingClass(InMemoryRepositorySource.class)
.setDescription("The repository for our content")
.setProperty("defaultWorkspaceName", workspaceName);
Another way to configure the in-memory connector is to create JcrConfiguration instance and load an XML configuration file that contains a repository source that
uses the InMemoryRepositorySource class.
For example a file named configRepository.xml can be created with these contents:
<?xml version="1.0" encoding="UTF-8"?>
<configuration xmlns:dna="http://www.jboss.org/dna/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0">
<!--
Define the sources for the content. These sources are directly accessible using the
DNA-specific Graph API. In fact, this is how the DNA JCR implementation works. You
can think of these as being similar to JDBC DataSource objects, except that they expose
graph content via the Graph API instead of records via SQL or JDBC.
-->
<dna:sources jcr:primaryType="nt:unstructured">
<!--
The 'IMR Store' repository is an in-memory source with a single default workspace (though
others could be created, too).
-->
<dna:source jcr:name="IMR Store"
dna:classname="org.jboss.dna.graph.connector.inmemory.InMemoryRepositorySource"
dna:description="The repository for our content"
dna:defaultWorkspaceName="default"/>
</dna:sources>
<!-- MIME type detectors and JCR repositories would be defined below -->
</configuration>
The configuration can then be loaded from Java like this:
JcrConfiguration config = new JcrConfiguration().loadFrom("/configRepository.xml");