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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.metadata.store.zookeeper;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.config.configcenter.ConfigItem;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.JsonUtils;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.metadata.MappingChangedEvent;
import org.apache.dubbo.metadata.MappingListener;
import org.apache.dubbo.metadata.MetadataInfo;
import org.apache.dubbo.metadata.report.identifier.BaseMetadataIdentifier;
import org.apache.dubbo.metadata.report.identifier.KeyTypeEnum;
import org.apache.dubbo.metadata.report.identifier.MetadataIdentifier;
import org.apache.dubbo.metadata.report.identifier.ServiceMetadataIdentifier;
import org.apache.dubbo.metadata.report.identifier.SubscriberMetadataIdentifier;
import org.apache.dubbo.metadata.report.support.AbstractMetadataReport;
import org.apache.dubbo.remoting.zookeeper.DataListener;
import org.apache.dubbo.remoting.zookeeper.EventType;
import org.apache.dubbo.remoting.zookeeper.ZookeeperClient;
import org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter;
import org.apache.zookeeper.data.Stat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import static org.apache.dubbo.common.constants.CommonConstants.PATH_SEPARATOR;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_ZOOKEEPER_EXCEPTION;
import static org.apache.dubbo.metadata.ServiceNameMapping.DEFAULT_MAPPING_GROUP;
import static org.apache.dubbo.metadata.ServiceNameMapping.getAppNames;
/**
* ZookeeperMetadataReport
*/
public class ZookeeperMetadataReport extends AbstractMetadataReport {
private final static ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(ZookeeperMetadataReport.class);
private final String root;
ZookeeperClient zkClient;
private Map casListenerMap = new ConcurrentHashMap<>();
public ZookeeperMetadataReport(URL url, ZookeeperTransporter zookeeperTransporter) {
super(url);
if (url.isAnyHost()) {
throw new IllegalStateException("registry address == null");
}
String group = url.getGroup(DEFAULT_ROOT);
if (!group.startsWith(PATH_SEPARATOR)) {
group = PATH_SEPARATOR + group;
}
this.root = group;
zkClient = zookeeperTransporter.connect(url);
}
protected String toRootDir() {
if (root.equals(PATH_SEPARATOR)) {
return root;
}
return root + PATH_SEPARATOR;
}
@Override
protected void doStoreProviderMetadata(MetadataIdentifier providerMetadataIdentifier, String serviceDefinitions) {
storeMetadata(providerMetadataIdentifier, serviceDefinitions);
}
@Override
protected void doStoreConsumerMetadata(MetadataIdentifier consumerMetadataIdentifier, String value) {
storeMetadata(consumerMetadataIdentifier, value);
}
@Override
protected void doSaveMetadata(ServiceMetadataIdentifier metadataIdentifier, URL url) {
zkClient.createOrUpdate(getNodePath(metadataIdentifier), URL.encode(url.toFullString()), false);
}
@Override
protected void doRemoveMetadata(ServiceMetadataIdentifier metadataIdentifier) {
zkClient.delete(getNodePath(metadataIdentifier));
}
@Override
protected List doGetExportedURLs(ServiceMetadataIdentifier metadataIdentifier) {
String content = zkClient.getContent(getNodePath(metadataIdentifier));
if (StringUtils.isEmpty(content)) {
return Collections.emptyList();
}
return new ArrayList<>(Collections.singletonList(URL.decode(content)));
}
@Override
protected void doSaveSubscriberData(SubscriberMetadataIdentifier subscriberMetadataIdentifier, String urls) {
zkClient.createOrUpdate(getNodePath(subscriberMetadataIdentifier), urls, false);
}
@Override
protected String doGetSubscribedURLs(SubscriberMetadataIdentifier subscriberMetadataIdentifier) {
return zkClient.getContent(getNodePath(subscriberMetadataIdentifier));
}
@Override
public String getServiceDefinition(MetadataIdentifier metadataIdentifier) {
return zkClient.getContent(getNodePath(metadataIdentifier));
}
private void storeMetadata(MetadataIdentifier metadataIdentifier, String v) {
zkClient.createOrUpdate(getNodePath(metadataIdentifier), v, false);
}
String getNodePath(BaseMetadataIdentifier metadataIdentifier) {
return toRootDir() + metadataIdentifier.getUniqueKey(KeyTypeEnum.PATH);
}
@Override
public void publishAppMetadata(SubscriberMetadataIdentifier identifier, MetadataInfo metadataInfo) {
String path = getNodePath(identifier);
if (StringUtils.isBlank(zkClient.getContent(path)) && StringUtils.isNotEmpty(metadataInfo.getContent())) {
zkClient.createOrUpdate(path, metadataInfo.getContent(), false);
}
}
@Override
public void unPublishAppMetadata(SubscriberMetadataIdentifier identifier, MetadataInfo metadataInfo) {
String path = getNodePath(identifier);
if (StringUtils.isNotEmpty(zkClient.getContent(path))) {
zkClient.delete(path);
}
}
@Override
public MetadataInfo getAppMetadata(SubscriberMetadataIdentifier identifier, Map instanceMetadata) {
String content = zkClient.getContent(getNodePath(identifier));
return JsonUtils.getJson().toJavaObject(content, MetadataInfo.class);
}
@Override
public Set getServiceAppMapping(String serviceKey, MappingListener listener, URL url) {
String path = buildPathKey(DEFAULT_MAPPING_GROUP, serviceKey);
MappingDataListener mappingDataListener = casListenerMap.computeIfAbsent(path, _k -> {
MappingDataListener newMappingListener = new MappingDataListener(serviceKey, path);
zkClient.addDataListener(path, newMappingListener);
return newMappingListener;
});
mappingDataListener.addListener(listener);
return getAppNames(zkClient.getContent(path));
}
@Override
public void removeServiceAppMappingListener(String serviceKey, MappingListener listener) {
String path = buildPathKey(DEFAULT_MAPPING_GROUP, serviceKey);
if (null != casListenerMap.get(path)) {
removeCasServiceMappingListener(path, listener);
}
}
@Override
public Set getServiceAppMapping(String serviceKey, URL url) {
String path = buildPathKey(DEFAULT_MAPPING_GROUP, serviceKey);
return getAppNames(zkClient.getContent(path));
}
@Override
public ConfigItem getConfigItem(String serviceKey, String group) {
String path = buildPathKey(group, serviceKey);
return zkClient.getConfigItem(path);
}
@Override
public boolean registerServiceAppMapping(String key, String group, String content, Object ticket) {
try {
if (ticket != null && !(ticket instanceof Stat)) {
throw new IllegalArgumentException("zookeeper publishConfigCas requires stat type ticket");
}
String pathKey = buildPathKey(group, key);
zkClient.createOrUpdate(pathKey, content, false, ticket == null ? null : ((Stat) ticket).getVersion());
return true;
} catch (Exception e) {
logger.warn(REGISTRY_ZOOKEEPER_EXCEPTION, "", "", "zookeeper publishConfigCas failed.", e);
return false;
}
}
@Override
public void destroy() {
super.destroy();
// release zk client reference, but should not close it
zkClient = null;
}
private String buildPathKey(String group, String serviceKey) {
return toRootDir() + group + PATH_SEPARATOR + serviceKey;
}
private void removeCasServiceMappingListener(String path, MappingListener listener) {
MappingDataListener mappingDataListener = casListenerMap.get(path);
mappingDataListener.removeListener(listener);
if (mappingDataListener.isEmpty()) {
zkClient.removeDataListener(path, mappingDataListener);
casListenerMap.remove(path, mappingDataListener);
}
}
private static class MappingDataListener implements DataListener {
private String serviceKey;
private String path;
private Set listeners;
public MappingDataListener(String serviceKey, String path) {
this.serviceKey = serviceKey;
this.path = path;
this.listeners = new HashSet<>();
}
public void addListener(MappingListener listener) {
this.listeners.add(listener);
}
public void removeListener(MappingListener listener) {
this.listeners.remove(listener);
}
public boolean isEmpty() {
return listeners.isEmpty();
}
@Override
public void dataChanged(String path, Object value, EventType eventType) {
if (!this.path.equals(path)) {
return;
}
if (EventType.NodeCreated != eventType && EventType.NodeDataChanged != eventType) {
return;
}
Set apps = getAppNames((String) value);
MappingChangedEvent event = new MappingChangedEvent(serviceKey, apps);
listeners.forEach(mappingListener -> mappingListener.onEvent(event));
}
}
}