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/*
* 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.dubbo.registry.client;
//
//import com.alibaba.fastjson.JSON;
//import org.apache.commons.io.FileUtils;
//import org.apache.dubbo.common.URL;
//import org.apache.dubbo.common.config.configcenter.ConfigChangedEvent;
//import org.apache.dubbo.common.config.configcenter.file.FileSystemDynamicConfiguration;
//import org.apache.dubbo.common.lang.ShutdownHookCallbacks;
//import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
//import org.apache.dubbo.common.logger.LoggerFactory;
//import org.apache.dubbo.common.utils.StringUtils;
//
//import java.io.File;
//import java.io.IOException;
//import java.nio.channels.FileChannel;
//import java.nio.channels.FileLock;
//import java.nio.file.LinkOption;
//import java.nio.file.Path;
//import java.nio.file.StandardOpenOption;
//import java.util.List;
//import java.util.Map;
//import java.util.Set;
//import java.util.concurrent.ConcurrentHashMap;
//import java.util.stream.Collectors;
//
//import static com.alibaba.fastjson.JSON.toJSONString;
//import static java.lang.String.format;
//import static java.nio.channels.FileChannel.open;
//import static org.apache.dubbo.common.config.configcenter.DynamicConfiguration.DEFAULT_GROUP;
//import static org.apache.dubbo.common.config.configcenter.file.FileSystemDynamicConfiguration.CONFIG_CENTER_DIR_PARAM_NAME;
//
///**
// * File System {@link ServiceDiscovery} implementation
// *
// * @see FileSystemDynamicConfiguration
// * @since 2.7.5
// */
//public class FileSystemServiceDiscovery extends AbstractServiceDiscovery {
//
// private final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(getClass());
//
// private final Map fileLocksCache = new ConcurrentHashMap<>();
//
// private FileSystemDynamicConfiguration dynamicConfiguration;
//
// public FileSystemServiceDiscovery(String serviceName) {
// super(serviceName);
// }
//
// @Override
// public void doInitialize(URL registryURL) throws Exception {
// dynamicConfiguration = createDynamicConfiguration(registryURL);
// registerDubboShutdownHook();
// registerListener();
// }
//
// private void registerDubboShutdownHook() {
// serviceInstance.getApplicationModel().getBeanFactory().getBean(ShutdownHookCallbacks.class)
// .addCallback(this::destroy);
// }
//
// private void registerListener() {
// getServices().forEach(serviceName -> {
// dynamicConfiguration.getConfigKeys(DEFAULT_GROUP).forEach(serviceInstanceId -> {
// dynamicConfiguration.addListener(serviceInstanceId, serviceName, this::onConfigChanged);
// });
// });
// }
//
// public void onConfigChanged(ConfigChangedEvent event) {
//
// }
//
// @Override
// public void doDestroy() throws Exception {
// dynamicConfiguration.close();
// releaseAndRemoveRegistrationFiles();
// }
//
// private void releaseAndRemoveRegistrationFiles() {
// fileLocksCache.keySet().forEach(file -> {
// releaseFileLock(file);
// removeFile(file);
// });
// }
//
// private void removeFile(File file) {
// FileUtils.deleteQuietly(file);
// }
//
// private String getServiceInstanceId(ServiceInstance serviceInstance) {
// String id = serviceInstance.getAddress();
// if (StringUtils.isBlank(id)) {
// return serviceInstance.getHost() + "." + serviceInstance.getPort();
// }
// return id;
// }
//
// private String getServiceName(ServiceInstance serviceInstance) {
// return serviceInstance.getServiceName();
// }
//
// @Override
// public List getInstances(String serviceName) {
// return dynamicConfiguration.getConfigKeys(DEFAULT_GROUP)
// .stream()
// .map(serviceInstanceId -> dynamicConfiguration.getConfig(serviceInstanceId, serviceName))
// .map(content -> JSON.parseObject(content, DefaultServiceInstance.class))
// .collect(Collectors.toList());
// }
//
// @Override
// public URL getUrl() {
// return null;
// }
//
//
// @Override
// public void doRegister(ServiceInstance serviceInstance) throws RuntimeException {
// this.serviceInstance = serviceInstance;
// String serviceInstanceId = getServiceInstanceId(serviceInstance);
// String serviceName = getServiceName(serviceInstance);
// String content = toJSONString(serviceInstance);
// if (dynamicConfiguration.publishConfig(serviceInstanceId, serviceName, content)) {
// lockFile(serviceInstanceId, serviceName);
// }
// }
//
// private void lockFile(String serviceInstanceId, String serviceName) {
// File serviceInstanceFile = serviceInstanceFile(serviceInstanceId, serviceName);
// Path serviceInstanceFilePath = serviceInstanceFile.toPath();
//
// fileLocksCache.computeIfAbsent(serviceInstanceFile, file -> {
// FileLock fileLock = null;
// try {
// FileChannel fileChannel = open(serviceInstanceFilePath, StandardOpenOption.READ, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS);
// fileLock = fileChannel.tryLock();
// } catch (IOException e) {
// if (logger.isErrorEnabled()) {
// logger.error(e.getMessage(), e);
// }
// }
// if (fileLock != null) {
// if (logger.isInfoEnabled()) {
// logger.info(format("%s has been locked", serviceInstanceFilePath.toAbsolutePath()));
// }
// }
// return fileLock;
// });
// }
//
// @Override
// public void doUnregister() throws RuntimeException {
// String key = getServiceInstanceId(serviceInstance);
// String group = getServiceName(serviceInstance);
// releaseFileLock(key, group);
// dynamicConfiguration.removeConfig(key, group);
// }
//
// private void releaseFileLock(String serviceInstanceId, String serviceName) {
// File serviceInstanceFile = serviceInstanceFile(serviceInstanceId, serviceName);
// releaseFileLock(serviceInstanceFile);
// }
//
// private void releaseFileLock(File serviceInstanceFile) {
// fileLocksCache.computeIfPresent(serviceInstanceFile, (f, fileLock) -> {
// releaseFileLock(fileLock);
// if (logger.isInfoEnabled()) {
// logger.info(format("The file[%s] has been released", serviceInstanceFile.getAbsolutePath()));
// }
// return null;
// });
// }
//
// private void releaseFileLock(FileLock fileLock) {
// try (FileChannel fileChannel = fileLock.channel()) {
// fileLock.release();
// } catch (IOException e) {
// if (logger.isErrorEnabled()) {
// logger.error(e.getMessage(), e);
// }
// }
// }
//
// private File serviceInstanceFile(String serviceInstanceId, String serviceName) {
// return dynamicConfiguration.configFile(serviceInstanceId, serviceName);
// }
//
// @Override
// public Set getServices() {
// return dynamicConfiguration.getConfigGroups();
// }
//
// private static FileSystemDynamicConfiguration createDynamicConfiguration(URL connectionURL) {
// String path = System.getProperty("user.home") + File.separator + ".dubbo" + File.separator + "registry";
// return new FileSystemDynamicConfiguration(connectionURL.addParameter(CONFIG_CENTER_DIR_PARAM_NAME, path));
// }
//}