private Revision incrementRevision(String clientId) {
final Revision current = getLastModification().getRevision();
final long incrementedVersion;
if (current.getVersion() == null) {
incrementedVersion = 0;
} else {
incrementedVersion = current.getVersion() + 1;
}
return new Revision(incrementedVersion, clientId);
}
@Override
public <T> ConfigurationSnapshot<T> configureFlow(
Revision revision, ConfigurationRequest<T> configurationRequest) {
lock();
try {
// check the revision
checkRevision(revision);
// execute the configuration request
final ConfigurationResult<T> result = configurationRequest.execute();
// update the revision
final Revision newRevision = updateRevision(incrementRevision(revision.getClientId()));
// build the result
return new ConfigurationSnapshot(
newRevision.getVersion(), result.getConfiguration(), result.isNew());
} finally {
unlock();
}
}