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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.proxy;
import com.yahoo.config.subscription.ConfigSourceSet;
import com.yahoo.config.subscription.impl.GenericConfigHandle;
import com.yahoo.config.subscription.impl.GenericConfigSubscriber;
import com.yahoo.config.subscription.impl.JRTConfigRequester;
import com.yahoo.vespa.config.ConfigKey;
import com.yahoo.vespa.config.RawConfig;
import com.yahoo.vespa.config.TimingValues;
import com.yahoo.yolean.Exceptions;
import java.util.Map;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author hmusum
*/
public class Subscriber {
private final static Logger log = Logger.getLogger(Subscriber.class.getName());
private final RawConfig config;
private final ConfigSourceSet configSourceSet;
private final TimingValues timingValues;
private final GenericConfigSubscriber subscriber;
private GenericConfigHandle handle;
Subscriber(RawConfig config, ConfigSourceSet configSourceSet, TimingValues timingValues, JRTConfigRequester requester) {
this.config = config;
this.configSourceSet = configSourceSet;
this.timingValues = timingValues;
this.subscriber = new GenericConfigSubscriber(Map.of(configSourceSet, requester));
}
void subscribe() {
ConfigKey<?> key = config.getKey();
handle = subscriber.subscribe(new ConfigKey<>(key.getName(), key.getConfigId(), key.getNamespace()),
config.getDefContent(), configSourceSet, timingValues);
}
public Optional<RawConfig> nextGeneration() {
try {
// 'isInitializing' argument to nextGeneration() is true, config proxy should never skip config due to not initializing
if (subscriber.nextGeneration(0, true)) {
RawConfig rawConfig = handle.getRawConfig();
if (rawConfig == null)
log.log(Level.SEVERE, "Config for " + config.getKey() + " is null");
return Optional.ofNullable(rawConfig);
}
} catch (Exception e) { // To avoid thread throwing exception and loop never running this again
log.log(Level.WARNING, "Got exception: " + Exceptions.toMessageString(e));
} catch (Throwable e) {
com.yahoo.protect.Process.logAndDie("Got error, exiting: " + Exceptions.toMessageString(e));
}
return Optional.empty();
}
public void cancel() {
if (subscriber != null) {
subscriber.close();
}
}
boolean isClosed() {
return subscriber.isClosed();
}
}
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