/*
* Copyright 1999-2012 Alibaba Group.
*
* 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.alibaba.dubbo.rpc.cluster.merger;
import com.alibaba.dubbo.common.extension.ExtensionLoader;
import com.alibaba.dubbo.common.utils.ReflectUtils;
import com.alibaba.dubbo.rpc.cluster.Merger;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* @author <a href="mailto:gang.lvg@alibaba-inc.com">kimi</a>
*/
public class MergerFactory {
private static final ConcurrentMap<Class<?>, Merger<?>> mergerCache =
new ConcurrentHashMap<Class<?>, Merger<?>>();
public static <T> Merger<T> getMerger(Class<T> returnType) {
Merger result;
if (returnType.isArray()) {
Class type = returnType.getComponentType();
result = mergerCache.get(type);
if (result == null) {
loadMergers();
result = mergerCache.get(type);
}
if(result == null && ! type.isPrimitive()) {
result = ArrayMerger.INSTANCE;
}
} else {
result = mergerCache.get(returnType);
if (result == null) {
loadMergers();
result = mergerCache.get(returnType);
}
}
return result;
}
static void loadMergers() {
Set<String> names = ExtensionLoader.getExtensionLoader(Merger.class)
.getSupportedExtensions();
for (String name : names) {
Merger m = ExtensionLoader.getExtensionLoader(Merger.class).getExtension(name);
mergerCache.putIfAbsent(ReflectUtils.getGenericClass(m.getClass()), m);
}
}
}