@Override public String requestMessageForLatestRevisionSince(PackageConfiguration packageConfiguration, RepositoryConfiguration repositoryConfiguration, PackageRevision previousRevision) { Map configuredValues = new LinkedHashMap(); configuredValues.put("repository-configuration", jsonResultMessageHandler.configurationToMap(repositoryConfiguration)); configuredValues.put("package-configuration", jsonResultMessageHandler.configurationToMap(packageConfiguration)); configuredValues.put("previous-revision", packageRevisionToMap(previousRevision)); return toJsonString(configuredValues); }