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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.subscription;
import com.yahoo.foo.AppConfig;
import com.yahoo.vespa.config.TimingValues;
/**
* @author hmusum
*
* Application that subscribes to config defined in app.def and
* generated code in AppConfig.java.
*/
public class AppService {
protected int timesConfigured = 0;
protected AppConfig config = null;
private final ConfigSubscriber subscriber;
protected final String configId;
final Thread configThread;
boolean stopThread = false;
public AppService(String configId, ConfigSourceSet csource) {
this(configId, csource, null);
}
public int timesConfigured() { return timesConfigured; }
public AppService(String configId, ConfigSourceSet csource, TimingValues timingValues) {
if (csource == null) throw new IllegalArgumentException("Config source cannot be null");
this.configId = configId;
subscriber = new ConfigSubscriber(csource);
ConfigHandle<AppConfig> temp;
if (timingValues == null) {
temp = subscriber.subscribe(AppConfig.class, configId);
} else {
temp = subscriber.subscribe(AppConfig.class, configId, csource, timingValues);
}
final ConfigHandle<AppConfig> handle = temp;
configThread = new Thread(new Runnable() {
@Override
public void run() {
while (!stopThread) {
boolean changed = subscriber.nextConfig(500);
if (changed) {
configure(handle.getConfig());
timesConfigured++;
}
}
}
});
subscriber.nextConfig(5000);
timesConfigured++;
configure(handle.getConfig());
configThread.setDaemon(true);
configThread.start();
}
public void configure(AppConfig config) {
this.config = config;
}
public void cancelSubscription() {
subscriber.close();
stopThread = true;
}
public AppConfig getConfig() {
return config;
}
public boolean isConfigured() {
return (timesConfigured > 0);
}
}
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