ConfigMemoryStore

The {@link oaj.config.store.ConfigMemoryStore} class is simply an in-memory storage location for configuration files.
There is no hard persistence and is used primarily for testing purposes.

However, the implementation provides a good idea on how stores work (especially the write method):

public class ConfigMemoryStore extends ConfigStore { // Some methods ommitted. private final ConcurrentHashMap<String,String> cache = new ConcurrentHashMap<>(); @Override /* ConfigStore */ public synchronized String read(String name) { return emptyIfNull(cache.get(name)); } @Override /* ConfigStore */ public synchronized String write(String name, String expectedContents, String newContents) { // This is a no-op. if (isEquals(expectedContents, newContents)) return null; String currentContents = read(name); if (expectedContents != null && ! isEquals(currentContents, expectedContents)) return currentContents; update(name, newContents); // Success! return null; } @Override /* ConfigStore */ public synchronized ConfigMemoryStore update(String name, String newContents) { cache.put(name, newContents); super.update(name, newContents); // Trigger any listeners. return this; } }