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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.vespa.config.server.session;
import com.google.common.base.Splitter;
import com.yahoo.config.model.api.ConfigDefinitionRepo;
import com.yahoo.log.LogLevel;
import com.yahoo.path.Path;
import com.yahoo.vespa.config.ConfigDefinitionKey;
import com.yahoo.vespa.config.buildergen.ConfigDefinition;
import com.yahoo.vespa.config.server.ServerCache;
import com.yahoo.vespa.config.util.ConfigUtils;
import com.yahoo.vespa.config.server.zookeeper.ConfigCurator;
import java.util.Map;
/**
* This class is tasked with reading config definitions and legacy configs/ from zookeeper, and create
* a {@link ServerCache} instance containing these in memory.
*
* @author lulf
* @since 5.1
*/
public class ServerCacheLoader {
private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(ServerCacheLoader.class.getName());
private final ConfigDefinitionRepo repo;
private final ConfigCurator configCurator;
private final Path path;
public ServerCacheLoader(ConfigCurator configCurator, Path rootPath, ConfigDefinitionRepo repo) {
this.configCurator = configCurator;
this.path = rootPath;
this.repo = repo;
}
public ServerCache loadCache() {
return loadConfigDefinitions();
}
/**
* Reads config definitions from zookeeper, parses them and puts both ConfigDefinition instances
* and payload (raw config definition) into cache.
*
* @return the populated cache.
*/
public ServerCache loadConfigDefinitions() {
ServerCache cache = new ServerCache();
try {
log.log(LogLevel.DEBUG, "Getting config definitions");
loadGlobalConfigDefinitions(cache);
loadConfigDefinitionsFromPath(cache, path.append(ConfigCurator.USER_DEFCONFIGS_ZK_SUBPATH).getAbsolute());
log.log(LogLevel.DEBUG, "Done getting config definitions");
} catch (Exception e) {
throw new IllegalStateException("Could not load config definitions for " + path, e);
}
return cache;
}
private void loadGlobalConfigDefinitions(ServerCache cache) {
for (Map.Entry<ConfigDefinitionKey, ConfigDefinition> entry : repo.getConfigDefinitions().entrySet()) {
cache.addDef(entry.getKey(), entry.getValue());
}
}
/**
* Loads config definitions from a specified path into server cache and returns it.
*
* @param appPath the path to load config definitions from
*/
private void loadConfigDefinitionsFromPath(ServerCache cache, String appPath) {
if ( ! configCurator.exists(appPath)) return;
for (String nodeName : configCurator.getChildren(appPath)) {
String payload = configCurator.getData(appPath, nodeName);
ConfigDefinitionKey dKey = ConfigUtils.createConfigDefinitionKeyFromZKString(nodeName);
cache.addDef(dKey, new ConfigDefinition(dKey.getName(), Splitter.on("\n").splitToList(payload).toArray(new String[0])));
}
}
}
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