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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 com.google.gson.Gson;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.utils.CollectionUtils;
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.ChildListener;
import org.apache.dubbo.remoting.zookeeper.ZookeeperClient;
import org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
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.GROUP_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.PATH_SEPARATOR;
/**
* ZookeeperMetadataReport
*/
public class ZookeeperMetadataReport extends AbstractMetadataReport {
private final String root;
final ZookeeperClient zkClient;
private Gson gson = new Gson();
private Map listenerMap = new ConcurrentHashMap<>();
public ZookeeperMetadataReport(URL url, ZookeeperTransporter zookeeperTransporter) {
super(url);
if (url.isAnyHost()) {
throw new IllegalStateException("registry address == null");
}
String group = url.getParameter(GROUP_KEY, DEFAULT_ROOT);
if (!group.startsWith(PATH_SEPARATOR)) {
group = PATH_SEPARATOR + group;
}
this.root = group;
zkClient = zookeeperTransporter.connect(url);
}
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.create(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(Arrays.asList(URL.decode(content)));
}
@Override
protected void doSaveSubscriberData(SubscriberMetadataIdentifier subscriberMetadataIdentifier, String urls) {
zkClient.create(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.create(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))) {
zkClient.create(path, gson.toJson(metadataInfo), false);
}
}
@Override
public void registerServiceAppMapping(String serviceKey, String application, URL url) {
String path = toRootDir() + serviceKey + PATH_SEPARATOR + application;
if (StringUtils.isBlank(zkClient.getContent(path))) {
Map value = new HashMap<>();
value.put("timestamp", String.valueOf(System.currentTimeMillis()));
zkClient.create(path, gson.toJson(value), false);
}
}
@Override
public MetadataInfo getAppMetadata(SubscriberMetadataIdentifier identifier, Map instanceMetadata) {
String content = zkClient.getContent(getNodePath(identifier));
return gson.fromJson(content, MetadataInfo.class);
}
@Override
public Set getServiceAppMapping(String serviceKey, MappingListener listener, URL url) {
Set appNameSet = new HashSet<>();
String path = toRootDir() + serviceKey;
List appNameList;
if (null == listenerMap.get(path)) {
zkClient.create(path, false);
appNameList = addServiceMappingListener(path, serviceKey, listener);
} else {
appNameList = zkClient.getChildren(path);
}
if (!CollectionUtils.isEmpty(appNameList)) {
appNameSet.addAll(appNameList);
}
return appNameSet;
}
private List addServiceMappingListener(String path, String serviceKey, MappingListener listener) {
ChildListener zkListener = new ChildListener() {
@Override
public void childChanged(String path, List children) {
MappingChangedEvent event = new MappingChangedEvent();
event.setServiceKey(serviceKey);
event.setApps(null != children ? new HashSet<>(children) : null);
listener.onEvent(event);
}
};
List childNodes = zkClient.addChildListener(path, zkListener);
listenerMap.put(path, zkListener);
return childNodes;
}
}