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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 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.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.event.EventListener;
import org.apache.dubbo.registry.client.event.ServiceInstancesChangedEvent;
import com.alibaba.fastjson.JSON;
import org.apache.commons.io.FileUtils;
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 implements EventListener {
private final Logger logger = LoggerFactory.getLogger(getClass());
private final Map fileLocksCache = new ConcurrentHashMap<>();
private FileSystemDynamicConfiguration dynamicConfiguration;
@Override
public void onEvent(ServiceInstancesChangedEvent event) {
}
@Override
public void initialize(URL registryURL) throws Exception {
dynamicConfiguration = createDynamicConfiguration(registryURL);
registerDubboShutdownHook();
registerListener();
}
private void registerDubboShutdownHook() {
ShutdownHookCallbacks.INSTANCE.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 destroy() 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.getId();
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) {
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 doUpdate(ServiceInstance serviceInstance) {
register(serviceInstance);
}
@Override
public void unregister(ServiceInstance serviceInstance) 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));
}
}