/*
* Copyright 1999-2011 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.registry.support;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.Extension;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.utils.NetUtils;
import com.alibaba.dubbo.registry.Registry;
import com.alibaba.dubbo.registry.RegistryFactory;
import com.alibaba.dubbo.rpc.Exporter;
import com.alibaba.dubbo.rpc.Invoker;
import com.alibaba.dubbo.rpc.Protocol;
import com.alibaba.dubbo.rpc.RpcConstants;
import com.alibaba.dubbo.rpc.RpcException;
import com.alibaba.dubbo.rpc.cluster.Cluster;
import com.alibaba.dubbo.rpc.protocol.InvokerWrapper;
/**
* RegistryProtocol
*
* @author william.liangf
*/
@Extension(Constants.REGISTRY_PROTOCOL)
public class RegistryProtocol implements Protocol {
private Cluster cluster;
public void setCluster(Cluster cluster) {
this.cluster = cluster;
}
private Protocol protocol;
public void setProtocol(Protocol protocol) {
this.protocol = protocol;
}
private RegistryFactory registryFactory;
public void setRegistryFactory(RegistryFactory registryFactory) {
this.registryFactory = registryFactory;
}
public int getDefaultPort() {
return 9090;
}
private final Map<String, Exporter<?>> bounds = new ConcurrentHashMap<String, Exporter<?>>();
@SuppressWarnings({ "unchecked", "rawtypes" })
public <T> Exporter<T> export(final Invoker<T> invoker) throws RpcException {
String export = invoker.getUrl().getParameterAndDecoded(RpcConstants.EXPORT_KEY);
if (export == null || export.length() == 0) {
throw new IllegalArgumentException("The registry export url is null! registry: " + invoker.getUrl());
}
URL url = URL.valueOf(export);
final String key = url.removeParameters("dynamic", "enabled").toFullString();
Exporter<T> exporter = (Exporter) bounds.get(key);
if (exporter == null) {
synchronized (bounds) {
exporter = (Exporter) bounds.get(key);
if (exporter == null) {
exporter = protocol.export(new InvokerWrapper<T>(invoker, url));
bounds.put(key, exporter);
}
}
}
URL registryUrl = invoker.getUrl();
if (Constants.REGISTRY_PROTOCOL.equals(registryUrl.getProtocol())) {
String protocol = registryUrl.getParameter(Constants.REGISTRY_KEY, Constants.DEFAULT_DIRECTORY);
registryUrl = registryUrl.setProtocol(protocol).removeParameter(Constants.REGISTRY_KEY);
}
final Exporter<T> serviceExporter = exporter;
final URL serviceUrl = url.removeParameters(getFilteredKeys(url));
final Registry registry = registryFactory.getRegistry(registryUrl);
registry.register(serviceUrl);
return new Exporter<T>() {
public Invoker<T> getInvoker() {
return invoker;
}
public void unexport() {
bounds.remove(key);
try {
registry.unregister(serviceUrl);
} finally {
serviceExporter.unexport();
}
}
};
}
public <T> Invoker<T> refer(Class<T> type, URL url) throws RpcException {
url = url.setProtocol(url.getParameter(Constants.REGISTRY_KEY, Constants.DEFAULT_REGISTRY)).removeParameter(Constants.REGISTRY_KEY);
Registry registry = registryFactory.getRegistry(url);
RegistryDirectory<T> directory = new RegistryDirectory<T>(type, url);
directory.setRegistry(registry);
directory.setProtocol(protocol);
registry.subscribe(new URL(Constants.SUBSCRIBE_PROTOCOL, NetUtils.getLocalHost(), 0, type.getName(), directory.getUrl().getParameters()), directory);
return cluster.merge(directory);
}
//过滤URL中不需要输出的参数(以点号开头的)
private static String[] getFilteredKeys(URL url) {
Map<String, String> params = url.getParameters();
if (params != null && !params.isEmpty()) {
List<String> filteredKeys = new ArrayList<String>();
for (Map.Entry<String, String> entry : params.entrySet()) {
if (entry != null && entry.getKey() != null && entry.getKey().startsWith(Constants.HIDE_KEY_PREFIX)) {
filteredKeys.add(entry.getKey());
}
}
return filteredKeys.toArray(new String[filteredKeys.size()]);
} else {
return new String[] {};
}
}
public void destroy() {
}
}