use of org.apache.helix.api.listeners.ScopedConfigChangeListener in project helix by apache.
the class CallbackHandler method invoke.
public void invoke(NotificationContext changeContext) throws Exception {
Type type = changeContext.getType();
long start = System.currentTimeMillis();
// This allows the listener to work with one change at a time
synchronized (_manager) {
if (logger.isInfoEnabled()) {
logger.info(Thread.currentThread().getId() + " START:INVOKE " + _path + " listener:" + _listener + " type: " + type);
}
if (!_expectTypes.contains(type)) {
logger.warn("Callback handler received event in wrong order. Listener: " + _listener + ", path: " + _path + ", expected types: " + _expectTypes + " but was " + type);
return;
}
_expectTypes = nextNotificationType.get(type);
if (type == Type.INIT || type == Type.FINALIZE) {
subscribeForChanges(changeContext.getType(), _path, _watchChild);
} else {
// put SubscribeForChange run in async thread to reduce the latency of zk callback handling.
subscribeForChangesAsyn(changeContext.getType(), _path, _watchChild);
}
_expectTypes = nextNotificationType.get(type);
if (_changeType == IDEAL_STATE) {
IdealStateChangeListener idealStateChangeListener = (IdealStateChangeListener) _listener;
List<IdealState> idealStates = preFetch(_propertyKey);
idealStateChangeListener.onIdealStateChange(idealStates, changeContext);
} else if (_changeType == INSTANCE_CONFIG) {
if (_listener instanceof ConfigChangeListener) {
ConfigChangeListener configChangeListener = (ConfigChangeListener) _listener;
List<InstanceConfig> configs = preFetch(_propertyKey);
configChangeListener.onConfigChange(configs, changeContext);
} else if (_listener instanceof InstanceConfigChangeListener) {
InstanceConfigChangeListener listener = (InstanceConfigChangeListener) _listener;
List<InstanceConfig> configs = preFetch(_propertyKey);
listener.onInstanceConfigChange(configs, changeContext);
}
} else if (_changeType == RESOURCE_CONFIG) {
ResourceConfigChangeListener listener = (ResourceConfigChangeListener) _listener;
List<ResourceConfig> configs = preFetch(_propertyKey);
listener.onResourceConfigChange(configs, changeContext);
} else if (_changeType == CLUSTER_CONFIG) {
ClusterConfigChangeListener listener = (ClusterConfigChangeListener) _listener;
ClusterConfig config = null;
if (_preFetchEnabled) {
config = _accessor.getProperty(_propertyKey);
}
listener.onClusterConfigChange(config, changeContext);
} else if (_changeType == CONFIG) {
ScopedConfigChangeListener listener = (ScopedConfigChangeListener) _listener;
List<HelixProperty> configs = preFetch(_propertyKey);
listener.onConfigChange(configs, changeContext);
} else if (_changeType == LIVE_INSTANCE) {
LiveInstanceChangeListener liveInstanceChangeListener = (LiveInstanceChangeListener) _listener;
List<LiveInstance> liveInstances = preFetch(_propertyKey);
liveInstanceChangeListener.onLiveInstanceChange(liveInstances, changeContext);
} else if (_changeType == CURRENT_STATE) {
CurrentStateChangeListener currentStateChangeListener = (CurrentStateChangeListener) _listener;
String instanceName = PropertyPathConfig.getInstanceNameFromPath(_path);
List<CurrentState> currentStates = preFetch(_propertyKey);
currentStateChangeListener.onStateChange(instanceName, currentStates, changeContext);
} else if (_changeType == MESSAGE) {
MessageListener messageListener = (MessageListener) _listener;
String instanceName = PropertyPathConfig.getInstanceNameFromPath(_path);
List<Message> messages = preFetch(_propertyKey);
messageListener.onMessage(instanceName, messages, changeContext);
} else if (_changeType == MESSAGES_CONTROLLER) {
MessageListener messageListener = (MessageListener) _listener;
List<Message> messages = preFetch(_propertyKey);
messageListener.onMessage(_manager.getInstanceName(), messages, changeContext);
} else if (_changeType == EXTERNAL_VIEW || _changeType == TARGET_EXTERNAL_VIEW) {
ExternalViewChangeListener externalViewListener = (ExternalViewChangeListener) _listener;
List<ExternalView> externalViewList = preFetch(_propertyKey);
externalViewListener.onExternalViewChange(externalViewList, changeContext);
} else if (_changeType == CONTROLLER) {
ControllerChangeListener controllerChangelistener = (ControllerChangeListener) _listener;
controllerChangelistener.onControllerChange(changeContext);
} else {
logger.warn("Unknown change type: " + _changeType);
}
long end = System.currentTimeMillis();
if (logger.isInfoEnabled()) {
logger.info(Thread.currentThread().getId() + " END:INVOKE " + _path + " listener:" + _listener + " type: " + type + " Took: " + (end - start) + "ms");
}
if (_monitor != null) {
_monitor.increaseCallbackCounters(end - start);
}
}
}
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