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Apache Solr (module: core)
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.solr.search;
import static org.apache.solr.common.params.CommonParams.NAME;
import java.lang.invoke.MethodHandles;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;
import org.apache.solr.common.ConfigNode;
import org.apache.solr.common.MapSerializable;
import org.apache.solr.common.util.CollectionUtil;
import org.apache.solr.core.PluginInfo;
import org.apache.solr.core.SolrConfig;
import org.apache.solr.core.SolrResourceLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Contains the knowledge of how cache config is stored in the solrconfig.xml file, and implements a
* factory to create caches.
*/
public class CacheConfig implements MapSerializable {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private String nodeName;
/**
* When this object is created, the core is not yet available . So, if the class is to be loaded
* from a package we should have a corresponding core
*/
@SuppressWarnings({"rawtypes"})
private Supplier> clazz;
private Map args;
private CacheRegenerator regenerator;
private String cacheImpl;
private Object[] persistence = new Object[1];
private String regenImpl;
public CacheConfig() {}
@SuppressWarnings({"rawtypes"})
public CacheConfig(
Class clazz, Map args, CacheRegenerator regenerator) {
this.clazz = () -> clazz;
this.args = args;
this.regenerator = regenerator;
this.nodeName = args.get(NAME);
}
public CacheRegenerator getRegenerator() {
return regenerator;
}
public void setRegenerator(CacheRegenerator regenerator) {
this.regenerator = regenerator;
}
public static Map getMultipleConfigs(
SolrResourceLoader loader, SolrConfig solrConfig, String configPath, List nodes) {
if (nodes == null || nodes.isEmpty()) {
return new LinkedHashMap<>();
}
Map result = CollectionUtil.newHashMap(nodes.size());
for (ConfigNode node : nodes) {
if (node.boolAttr("enabled", true)) {
CacheConfig config =
getConfig(loader, solrConfig, node.name(), node.attributes().asMap(), configPath);
result.put(config.args.get(NAME), config);
}
}
return result;
}
public static CacheConfig getConfig(SolrConfig solrConfig, ConfigNode node, String xpath) {
if (!node.boolAttr("enabled", true) || !node.exists()) {
return null;
}
return getConfig(solrConfig, node.name(), node.attributes().asMap(), xpath);
}
public static CacheConfig getConfig(
SolrConfig solrConfig, String nodeName, Map attrs, String xpath) {
return getConfig(solrConfig.getResourceLoader(), solrConfig, nodeName, attrs, xpath);
}
public static CacheConfig getConfig(
SolrResourceLoader loader,
SolrConfig solrConfig,
String nodeName,
Map attrs,
String xpath) {
CacheConfig config = new CacheConfig();
config.nodeName = nodeName;
Map attrsCopy = CollectionUtil.newLinkedHashMap(attrs.size());
for (Map.Entry e : attrs.entrySet()) {
attrsCopy.put(e.getKey(), String.valueOf(e.getValue()));
}
attrs = attrsCopy;
config.args = attrs;
Map map =
xpath == null ? null : solrConfig.getOverlay().getEditableSubProperties(xpath);
if (map != null) {
HashMap mapCopy = new HashMap<>(config.args);
for (Map.Entry e : map.entrySet()) {
mapCopy.put(e.getKey(), String.valueOf(e.getValue()));
}
config.args = mapCopy;
}
String nameAttr = config.args.get(NAME); // OPTIONAL
if (nameAttr == null) {
config.args.put(NAME, config.nodeName);
}
config.cacheImpl = config.args.get("class");
if (config.cacheImpl == null) config.cacheImpl = "solr.CaffeineCache";
config.clazz =
new Supplier<>() {
@SuppressWarnings("rawtypes")
Class loadedClass;
@Override
@SuppressWarnings("rawtypes")
public Class get() {
if (loadedClass != null) return loadedClass;
return loadedClass =
loader.findClass(
new PluginInfo("cache", Collections.singletonMap("class", config.cacheImpl)),
SolrCache.class,
true);
}
};
config.regenImpl = config.args.get("regenerator");
if (config.regenImpl != null) {
config.regenerator = loader.newInstance(config.regenImpl, CacheRegenerator.class);
}
return config;
}
@SuppressWarnings({"rawtypes"})
public SolrCache newInstance() {
try {
SolrCache cache = clazz.get().getConstructor().newInstance();
persistence[0] = cache.init(args, persistence[0], regenerator);
return cache;
} catch (Exception e) {
log.error("Error instantiating cache", e);
// we can carry on without a cache... but should we?
// in some cases (like an OOM) we probably should try to continue.
return null;
}
}
@Override
public Map toMap(Map argsMap) {
// TODO: Should not create new HashMap?
return new HashMap<>(args);
}
public String getNodeName() {
return nodeName;
}
}