/**
* Returns shared parameters for a given instance identifier.
*
* @param instanceId the instance identifier
* @return shared parameters or null, if no shared parameters exist for given instance identifier
* @throws Exception if an error occurs while reading parameters
*/
public synchronized SharedParameters getShared(String instanceId) throws Exception {
String safeInstanceId = escapeInstanceIdentifier(instanceId);
log.trace("getShared(instance = {}, directory = {})", instanceId, safeInstanceId);
SharedParameters parameters = sharedParameters.get(safeInstanceId);
if (!reloadIfChanged) {
return parameters;
}
if (parameters != null && parameters.hasChanged()) {
parameters.reload();
} else if (parameters == null) {
// Parameters not cached, attempt to load it from disk.
Path instanceDir = Paths.get(path.toString(), safeInstanceId);
loadSharedParameters(instanceDir, sharedParameters);
}
return sharedParameters.get(safeInstanceId);
}
