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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.di;
import com.yahoo.config.ConfigInstance;
import com.yahoo.config.subscription.ConfigHandle;
import com.yahoo.config.subscription.ConfigSource;
import com.yahoo.config.subscription.ConfigSourceSet;
import com.yahoo.config.subscription.ConfigSubscriber;
import com.yahoo.container.di.config.Subscriber;
import com.yahoo.container.di.config.SubscriberFactory;
import com.yahoo.vespa.config.ConfigKey;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.WeakHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author Tony Vaagenes
* @author ollivir
*/
public class CloudSubscriberFactory implements SubscriberFactory {
private static final Logger log = Logger.getLogger(CloudSubscriberFactory.class.getName());
private final ConfigSource configSource;
private final Map<CloudSubscriber, Integer> activeSubscribers = new WeakHashMap<>();
private Optional<Long> testGeneration = Optional.empty();
public CloudSubscriberFactory(ConfigSource configSource) {
this.configSource = configSource;
}
@Override
public Subscriber getSubscriber(Set<? extends ConfigKey<?>> configKeys) {
Set<ConfigKey<ConfigInstance>> subscriptionKeys = new HashSet<>();
for(ConfigKey<?> key: configKeys) {
@SuppressWarnings("unchecked") // ConfigKey is defined as <CONFIGCLASS extends ConfigInstance>
ConfigKey<ConfigInstance> invariant = (ConfigKey<ConfigInstance>) key;
subscriptionKeys.add(invariant);
}
CloudSubscriber subscriber = new CloudSubscriber(subscriptionKeys, configSource);
testGeneration.ifPresent(subscriber.subscriber::reload); // TODO: test specific code, remove
activeSubscribers.put(subscriber, 0);
return subscriber;
}
//TODO: test specific code, remove
@Override
public void reloadActiveSubscribers(long generation) {
testGeneration = Optional.of(generation);
List<CloudSubscriber> subscribers = new ArrayList<>(activeSubscribers.keySet());
subscribers.forEach(s -> s.subscriber.reload(generation));
}
private static class CloudSubscriber implements Subscriber {
private final ConfigSubscriber subscriber;
private final Map<ConfigKey<ConfigInstance>, ConfigHandle<ConfigInstance>> handles = new HashMap<>();
// if waitNextGeneration has not yet been called, -1 should be returned
private long generation = -1L;
private CloudSubscriber(Set<ConfigKey<ConfigInstance>> keys, ConfigSource configSource) {
this.subscriber = new ConfigSubscriber(configSource);
keys.forEach(k -> handles.put(k, subscriber.subscribe(k.getConfigClass(), k.getConfigId())));
}
@Override
public boolean configChanged() {
return handles.values().stream().anyMatch(ConfigHandle::isChanged);
}
@Override
public long generation() {
return generation;
}
//mapValues returns a view,, so we need to force evaluation of it here to prevent deferred evaluation.
@Override
public Map<ConfigKey<ConfigInstance>, ConfigInstance> config() {
Map<ConfigKey<ConfigInstance>, ConfigInstance> ret = new HashMap<>();
handles.forEach((k, v) -> ret.put(k, v.getConfig()));
return ret;
}
@Override
public long waitNextGeneration(boolean isInitializing) {
if (handles.isEmpty())
throw new IllegalStateException("No config keys registered");
// Catch and just log config exceptions due to missing config values for parameters that do
// not have a default value. These exceptions occur when the user has removed a component
// from services.xml, and the component takes a config that has parameters without a
// default value in the def-file. There is a new 'components' config underway, where the
// component is removed, so this old config generation will soon be replaced by a new one.
boolean gotNextGen = false;
int numExceptions = 0;
while ( ! gotNextGen) {
try {
if (subscriber.nextGeneration(isInitializing))
gotNextGen = true;
}
catch (IllegalArgumentException e) {
numExceptions++;
log.log(Level.WARNING, "Got exception from the config system (ignore if you just removed a " +
"component from your application that used the mentioned config) Subscriber info: " +
subscriber.toString(), e);
if (numExceptions >= 5)
throw new IllegalArgumentException("Failed retrieving the next config generation", e);
}
}
generation = subscriber.getGeneration();
return generation;
}
@Override
public void close() {
subscriber.close();
}
}
public static class Provider implements com.google.inject.Provider<SubscriberFactory> {
@Override
public SubscriberFactory get() {
return new CloudSubscriberFactory(ConfigSourceSet.createDefault());
}
}
}
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