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See the below interfaces; Processor modules can register handlers for specific content types during module startup (or whenever deemed appropriate by the module). The content handlers need to provide functionality to save and retrieve content. Interface handlers can simply then retrieve a registered instance based on the content type of the data they need to handle. The Content Handler module will provide a default handler in the case In the event that there are no handlers registered for a requested type. Most likely this will be the Unstructured Document handlerspecific type, the module can use a handler registered for the "application/*" type or throw an exception if this fall-back doesn't exist either. The module follows the prototype pattern for content handler instantiation. When registering a handler, a Processor module provides an instance of a handler. Then whenever the getContentHandler method is called, the Content Handler module will clone an instance of the handler for use by the caller.

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public interface ContentHandlerService extends OpenMRSService {
 
	/** To be called by interface modules */
	ContentHandler getContentHandler(String contentType) throws NoHandlerForContentTypeException;
 
	/** To be called by processor modules on startup */
	void RegisterContentHandler(String contentType, ContentHandler prototype) throws AlreadyRegisteredException;
	/** To be called by processor modules on shutdown */
	void DeregisterContentHandler(String contentType);
}

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