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17.29. Repository Providers

The ModeShape REST and ModeShape WebDAV servers can provide access to other JCR repositories by implementing the org.modeshape.web.jcr.spi.RepositoryProvider interface.
There are four methods defined by the RepositoryProvider interface: startup, getJcrRepositoryNames, getSession and shutdown. When org.modeshape.web.jcr.ModeShapeJcrDeployer starts, it will call the RepositoryProvider startup method which will load the configuration (for example, from a web.xml file) and initialize the repository.
As an example, here's the ModeShape JCR provider implementation of this method with exception handling omitted for brevity. 
public void startup( ServletContext context ) {
    String configFile = context.getInitParameter(CONFIG_FILE);

     InputStream configFileInputStream = getClass().getResourceAsStream(configFile);
     jcrEngine = new JcrConfiguration().loadFrom(configFileInputStream).build();
     jcrEngine.start();
}
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The name of configuration file for the JcrEngine is read from the servlet context and used to initialize the engine. Once the repository has been started, it is ready to accept the main methods that provide the interface to the repository.
The first method returns the set of repository names supported by this repository. 
public Set<String> getJcrRepositoryNames() {
    return new HashSet<String>(jcrEngine.getRepositoryNames());
}
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The ModeShape JCR repository does support multiple repositories on the same server. Other JCR implementations that don't support multiple repositories are free to return a singleton set containing any string from this method.
The other required method returns an open JCR Session for the user from the current request in a given repository and workspace. The provider can use the HttpServletRequest to get the authentication credentials for the HTTP user. 
public Session getSession( HttpServletRequest request,
                           String repositoryName,
                           String workspaceName ) throws RepositoryException {
    Repository repository = getRepository(repositoryName);

	SecurityContext context = new ServletSecurityContext(request);
	Credentials credentials = new SecurityContextCredentials(context);
    return repository.login(credentials, workspaceName);
}
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The getSession(...) method is used by most of the REST server methods to access the JCR repository and return results as needed.
Finally, the shutdown() method signals that the web context is being undeployed and the JCR repository should shutdown and clean up any resources that are in use.
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