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// Copyright (C) 2016 The Android Open Source Project
//
// Licensed 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 com.google.gerrit.server;
import static java.util.stream.Collectors.toList;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.ProvisionException;
import java.util.Arrays;
import java.util.List;
import org.eclipse.jgit.lib.Config;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Loads configured Guice modules from {@code gerrit.installModule}. */
public class LibModuleLoader {
private static final Logger log = LoggerFactory.getLogger(LibModuleLoader.class);
public static List<Module> loadModules(Injector parent) {
Config cfg = getConfig(parent);
return Arrays.stream(cfg.getStringList("gerrit", null, "installModule"))
.map(m -> createModule(parent, m))
.collect(toList());
}
private static Config getConfig(Injector i) {
return i.getInstance(Key.get(Config.class, GerritServerConfig.class));
}
private static Module createModule(Injector injector, String className) {
Module m = injector.getInstance(loadModule(className));
log.info("Installed module {}", className);
return m;
}
@SuppressWarnings("unchecked")
private static Class<Module> loadModule(String className) {
try {
return (Class<Module>) Class.forName(className);
} catch (ClassNotFoundException | LinkageError e) {
String msg = "Cannot load LibModule " + className;
log.error(msg, e);
throw new ProvisionException(msg, e);
}
}
}
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