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DefaultUnleash.java
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DefaultUnleash.java
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package io.getunleash;
import static io.getunleash.Variant.DISABLED_VARIANT;
import static java.util.Optional.ofNullable;
import io.getunleash.event.EventDispatcher;
import io.getunleash.event.ToggleEvaluated;
import io.getunleash.lang.Nullable;
import io.getunleash.metric.UnleashMetricService;
import io.getunleash.metric.UnleashMetricServiceImpl;
import io.getunleash.repository.FeatureRepository;
import io.getunleash.repository.IFeatureRepository;
import io.getunleash.strategy.*;
import io.getunleash.util.ConstraintMerger;
import io.getunleash.util.UnleashConfig;
import io.getunleash.variant.VariantUtil;
import java.util.*;
import java.util.function.BiPredicate;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DefaultUnleash implements Unleash {
private static final Logger LOGGER = LoggerFactory.getLogger(DefaultUnleash.class);
private static final List<Strategy> BUILTIN_STRATEGIES =
Arrays.asList(
new DefaultStrategy(),
new ApplicationHostnameStrategy(),
new GradualRolloutRandomStrategy(),
new GradualRolloutSessionIdStrategy(),
new GradualRolloutUserIdStrategy(),
new RemoteAddressStrategy(),
new UserWithIdStrategy(),
new FlexibleRolloutStrategy());
public static final UnknownStrategy UNKNOWN_STRATEGY = new UnknownStrategy();
private final UnleashMetricService metricService;
private final IFeatureRepository featureRepository;
private final Map<String, Strategy> strategyMap;
private final UnleashContextProvider contextProvider;
private final EventDispatcher eventDispatcher;
private final UnleashConfig config;
private static IFeatureRepository defaultToggleRepository(UnleashConfig unleashConfig) {
return new FeatureRepository(unleashConfig);
}
public DefaultUnleash(UnleashConfig unleashConfig, Strategy... strategies) {
this(unleashConfig, defaultToggleRepository(unleashConfig), strategies);
}
public DefaultUnleash(
UnleashConfig unleashConfig,
IFeatureRepository featureRepository,
Strategy... strategies) {
this(
unleashConfig,
featureRepository,
buildStrategyMap(strategies),
unleashConfig.getContextProvider(),
new EventDispatcher(unleashConfig),
new UnleashMetricServiceImpl(unleashConfig, unleashConfig.getScheduledExecutor()));
}
// Visible for testing
public DefaultUnleash(
UnleashConfig unleashConfig,
IFeatureRepository featureRepository,
Map<String, Strategy> strategyMap,
UnleashContextProvider contextProvider,
EventDispatcher eventDispatcher,
UnleashMetricService metricService) {
this.config = unleashConfig;
this.featureRepository = featureRepository;
this.strategyMap = strategyMap;
this.contextProvider = contextProvider;
this.eventDispatcher = eventDispatcher;
this.metricService = metricService;
metricService.register(strategyMap.keySet());
}
@Override
public boolean isEnabled(final String toggleName) {
return isEnabled(toggleName, false);
}
@Override
public boolean isEnabled(final String toggleName, final boolean defaultSetting) {
return isEnabled(toggleName, contextProvider.getContext(), defaultSetting);
}
@Override
public boolean isEnabled(
final String toggleName, final UnleashContext context, final boolean defaultSetting) {
return isEnabled(toggleName, context, (n, c) -> defaultSetting);
}
@Override
public boolean isEnabled(
final String toggleName,
final BiPredicate<String, UnleashContext> fallbackAction) {
return isEnabled(toggleName, contextProvider.getContext(), fallbackAction);
}
@Override
public boolean isEnabled(
String toggleName,
UnleashContext context,
BiPredicate<String, UnleashContext> fallbackAction) {
boolean enabled = checkEnabled(toggleName, context, fallbackAction);
count(toggleName, enabled);
eventDispatcher.dispatch(new ToggleEvaluated(toggleName, enabled));
return enabled;
}
private boolean checkEnabled(
String toggleName,
UnleashContext context,
BiPredicate<String, UnleashContext> fallbackAction) {
checkIfToggleMatchesNamePrefix(toggleName);
FeatureToggle featureToggle = featureRepository.getToggle(toggleName);
boolean enabled;
UnleashContext enhancedContext = context.applyStaticFields(config);
if (featureToggle == null) {
enabled = fallbackAction.test(toggleName, enhancedContext);
} else if (!featureToggle.isEnabled()) {
enabled = false;
} else if (featureToggle.getStrategies().size() == 0) {
return true;
} else {
enabled =
featureToggle.getStrategies().stream()
.anyMatch(
strategy -> {
Strategy configuredStrategy =
getStrategy(strategy.getName());
if (configuredStrategy == UNKNOWN_STRATEGY) {
LOGGER.warn(
"Unable to find matching strategy for toggle:{} strategy:{}",
toggleName,
strategy.getName());
}
return configuredStrategy.isEnabled(
strategy.getParameters(),
enhancedContext,
ConstraintMerger.mergeConstraints(
featureRepository, strategy));
});
}
return enabled;
}
private void checkIfToggleMatchesNamePrefix(String toggleName) {
if (config.getNamePrefix() != null) {
if (!toggleName.startsWith(config.getNamePrefix())) {
LOGGER.warn(
"Toggle [{}] doesnt start with configured name prefix of [{}] so it will always be disabled",
toggleName,
config.getNamePrefix());
}
}
}
@Override
public Variant getVariant(String toggleName, UnleashContext context) {
return getVariant(toggleName, context, DISABLED_VARIANT);
}
@Override
public Variant getVariant(String toggleName, UnleashContext context, Variant defaultValue) {
FeatureToggle featureToggle = featureRepository.getToggle(toggleName);
boolean enabled = checkEnabled(toggleName, context, (n, c) -> false);
Variant variant =
enabled
? VariantUtil.selectVariant(featureToggle, context, defaultValue)
: defaultValue;
metricService.countVariant(toggleName, variant.getName());
return variant;
}
@Override
public Variant getVariant(String toggleName) {
return getVariant(toggleName, contextProvider.getContext());
}
@Override
public Variant getVariant(String toggleName, Variant defaultValue) {
return getVariant(toggleName, contextProvider.getContext(), defaultValue);
}
/**
* Use more().getFeatureToggleDefinition() instead
*
* @return the feature toggle
*/
@Deprecated
public Optional<FeatureToggle> getFeatureToggleDefinition(String toggleName) {
return ofNullable(featureRepository.getToggle(toggleName));
}
/**
* Use more().getFeatureToggleNames() instead
*
* @return a list of known toggle names
*/
@Deprecated()
public List<String> getFeatureToggleNames() {
return featureRepository.getFeatureNames();
}
/** Use more().count() instead */
@Deprecated
public void count(final String toggleName, boolean enabled) {
metricService.count(toggleName, enabled);
}
private static Map<String, Strategy> buildStrategyMap(@Nullable Strategy[] strategies) {
Map<String, Strategy> map = new HashMap<>();
BUILTIN_STRATEGIES.forEach(strategy -> map.put(strategy.getName(), strategy));
if (strategies != null) {
for (Strategy strategy : strategies) {
map.put(strategy.getName(), strategy);
}
}
return map;
}
private Strategy getStrategy(String strategy) {
return strategyMap.getOrDefault(strategy, config.getFallbackStrategy());
}
@Override
public void shutdown() {
config.getScheduledExecutor().shutdown();
}
@Override
public MoreOperations more() {
return new DefaultMore();
}
public class DefaultMore implements MoreOperations {
@Override
public List<String> getFeatureToggleNames() {
return featureRepository.getFeatureNames();
}
@Override
public Optional<FeatureToggle> getFeatureToggleDefinition(String toggleName) {
return ofNullable(featureRepository.getToggle(toggleName));
}
@Override
public List<EvaluatedToggle> evaluateAllToggles() {
return evaluateAllToggles(contextProvider.getContext());
}
@Override
public List<EvaluatedToggle> evaluateAllToggles(UnleashContext context) {
return getFeatureToggleNames().stream()
.map(
toggleName -> {
boolean enabled =
checkEnabled(toggleName, context, (n, c) -> false);
FeatureToggle featureToggle =
featureRepository.getToggle(toggleName);
Variant variant =
enabled
? VariantUtil.selectVariant(
featureToggle, context, DISABLED_VARIANT)
: DISABLED_VARIANT;
return new EvaluatedToggle(toggleName, enabled, variant);
})
.collect(Collectors.toList());
}
@Override
public void count(final String toggleName, boolean enabled) {
metricService.count(toggleName, enabled);
}
@Override
public void countVariant(final String toggleName, String variantName) {
metricService.countVariant(toggleName, variantName);
}
}
}