@Override
public boolean isActive(FeatureState state, FeatureUser user) {
if (user != null && Strings.isNotBlank(user.getName())) {
String percentageAsString = state.getParameter(PARAM_PERCENTAGE);
try {
int percentage = Integer.valueOf(percentageAsString);
if (percentage > 0) {
int hashCode = Math.abs(calculateHashCode(user, state.getFeature()));
return (hashCode % 100) < percentage;
}
} catch (NumberFormatException e) {
log.error(
"Invalid gradual rollout percentage for feature "
+ state.getFeature().name()
+ ": "
+ percentageAsString);
}
}
return false;
}
@Override
public int doStartTag() throws JspException {
boolean inverse = false;
if (name.startsWith("!")) {
inverse = true;
name = name.substring(1);
}
boolean isActive = isFeatureActive();
if (inverse) {
isActive = !isActive;
}
if (Strings.isNotBlank(var)) {
pageContext.setAttribute(var, isActive, PageContext.PAGE_SCOPE);
}
return isActive ? Tag.EVAL_BODY_INCLUDE : Tag.SKIP_BODY;
}
protected boolean isFeatureActive() {
if (Strings.isNotBlank(name)) {
return featureManager.isActive(new NamedFeature(name));
}
return false;
}
@Override
public boolean isValid(String value) {
return Strings.isNotBlank(value) && languages.contains(value);
}
@Override
public String getDescription() {
return "The script language to use. Your system seems to support the following languages: "
+ Strings.join(languages, ", ");
}