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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.pkg;
import java.lang.invoke.MethodHandles;
import org.apache.solr.core.PluginBag;
import org.apache.solr.core.PluginInfo;
import org.apache.solr.core.RequestParams;
import org.apache.solr.core.SolrConfig;
import org.apache.solr.core.SolrCore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class PackagePluginHolder extends PluginBag.PluginHolder {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
public static final String LATEST = "$LATEST";
private final SolrCore core;
private final SolrConfig.SolrPluginInfo pluginMeta;
private PackageLoader.Package.Version pkgVersion;
private PluginInfo info;
public PackagePluginHolder(PluginInfo info, SolrCore core, SolrConfig.SolrPluginInfo pluginMeta) {
super(info);
this.core = core;
this.pluginMeta = pluginMeta;
this.info = info;
reload(core.getCoreContainer().getPackageLoader().getPackage(info.pkgName));
core.getPackageListeners().addListener(new PackageListeners.Listener() {
@Override
public String packageName() {
return info.pkgName;
}
@Override
public PluginInfo pluginInfo() {
return info;
}
@Override
public void changed(PackageLoader.Package pkg) {
reload(pkg);
}
@Override
public PackageLoader.Package.Version getPackageVersion() {
return pkgVersion;
}
});
}
private String maxVersion() {
RequestParams.ParamSet p = core.getSolrConfig().getRequestParams().getParams(PackageListeners.PACKAGE_VERSIONS);
if (p == null) {
return null;
}
Object o = p.get().get(info.pkgName);
if (o == null || LATEST.equals(o)) return null;
return o.toString();
}
private synchronized void reload(PackageLoader.Package pkg) {
String lessThan = maxVersion();
PackageLoader.Package.Version newest = pkg.getLatest(lessThan);
if (newest == null) {
log.error("No latest version available for package : {}", pkg.name());
return;
}
if (lessThan != null) {
PackageLoader.Package.Version pkgLatest = pkg.getLatest();
if (pkgLatest != newest) {
log.info("Using version :{}. latest is {}, params.json has config {} : {}", newest.getVersion(), pkgLatest.getVersion(), pkg.name(), lessThan);
}
}
if (pkgVersion != null) {
if (newest == pkgVersion) {
//I'm already using the latest classloder in the package. nothing to do
return;
}
}
log.info("loading plugin: {} -> {} using package {}:{}",
pluginInfo.type, pluginInfo.name, pkg.name(), newest.getVersion());
Object instance = SolrCore.createInstance(pluginInfo.className,
pluginMeta.clazz, pluginMeta.getCleanTag(), core, newest.getLoader());
PluginBag.initInstance(instance, pluginInfo);
T old = inst;
inst = (T) instance;
pkgVersion = newest;
if (old instanceof AutoCloseable) {
AutoCloseable closeable = (AutoCloseable) old;
try {
closeable.close();
} catch (Exception e) {
log.error("error closing plugin", e);
}
}
}
}