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/*-
* ============LICENSE_START=======================================================
* VES Collector
* ================================================================================
* Copyright (C) 2020 Nokia. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae;
import org.onap.dcae.configuration.ConfigurationHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.Disposable;
import java.time.Duration;
/**
* ApplicationConfigurationListener is used to listen at notifications with configuration updates send from Consul.
*/
public class ApplicationConfigurationListener implements Runnable {
private static Logger log = LoggerFactory.getLogger(ApplicationConfigurationListener.class);
private Duration interval;
private boolean terminate = false;
private final ConfigurationHandler configurationHandler;
/**
* Constructor
* @param interval defines period of time when notification can come
* @param configurationHandler handles notifications send by Consul
*/
public ApplicationConfigurationListener(Duration interval, ConfigurationHandler configurationHandler) {
this.interval = interval;
this.configurationHandler = configurationHandler;
}
/**
* Reload listener to start listening for Consul notifications with defined interval.
* @param interval defines period of time when notification can come
*/
public synchronized void reload(Duration interval) {
this.interval = interval;
log.info("Handler configuration was changed. Need to reload configuration handler.");
sendReloadAction();
}
synchronized void sendReloadAction() {
this.notifyAll();
}
/**
* Start listening for Consul notification.
*/
@Override
public void run() {
Disposable consulListener = null;
do {
try {
consulListener = listenForConfigurationUpdates();
synchronized (this) {
log.info("Switch to configuration handler thread. Active waiting for configuration from Consul.");
this.wait();
}
} catch (Exception e) {
log.error("Unexpected error occurred during handling data from Consul.", e);
terminate();
} finally {
stopListeningForConfigurationUpdates(consulListener);
}
} while (!this.terminate);
}
private Disposable listenForConfigurationUpdates() {
return this.configurationHandler.startListen(this.interval);
}
void terminate() {
this.terminate = true;
}
/**
* Release resources when there is a need to stop listener
* @param consulListener Handler to Consul listener
*/
void stopListeningForConfigurationUpdates(Disposable consulListener) {
if (consulListener != null) {
consulListener.dispose();
}
}
}
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