@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 boolean isActive(FeatureState featureState, FeatureUser user) {
String lang = featureState.getParameter(PARAM_LANG);
String script = featureState.getParameter(PARAM_SCRIPT);
ScriptEngine engine = engineManager.getEngineByName(lang);
if (engine == null) {
log.error("Could not find script engine for: " + lang);
return false;
}
engine.put("user", user);
engine.put("date", new Date());
try {
Object result = engine.eval(script);
if (result instanceof Boolean) {
return ((Boolean) result).booleanValue();
}
} catch (ScriptException e) {
log.error(
"Could not evaluate script for feature "
+ featureState.getFeature().name()
+ ": "
+ e.getMessage());
}
return false;
}
@Override
public void setFeatureState(FeatureState state) {
if (state.isEnabled()) {
activeFeatures.add(state.getFeature().name());
} else {
activeFeatures.remove(state.getFeature().name());
}
}
@Override
public FeatureState getFeatureState(Feature feature) {
// first try to find it from the cache
CacheEntry entry = cache.get(feature);
if (entry != null && !isExpired(entry)) {
return entry.getState() != null ? entry.getState().copy() : null;
}
// no cache hit
FeatureState featureState = delegate.getFeatureState(feature);
// cache the result (may be null)
cache.put(feature, new CacheEntry(featureState != null ? featureState.copy() : null));
// return the result
return featureState;
}
@Override
public void setFeatureState(FeatureState featureState) {
delegate.setFeatureState(featureState);
cache.remove(featureState.getFeature());
}