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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.configcenter.support.zookeeper;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.config.configcenter.ConfigItem;
import org.apache.dubbo.common.config.configcenter.ConfigurationListener;
import org.apache.dubbo.common.config.configcenter.TreePathDynamicConfiguration;
import org.apache.dubbo.common.threadpool.support.AbortPolicyWithReport;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.NamedThreadFactory;
import org.apache.dubbo.remoting.zookeeper.ZookeeperClient;
import org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter;
import org.apache.zookeeper.data.Stat;
import java.util.Collection;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.CONFIG_FAILED_CONNECT_REGISTRY;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_ZOOKEEPER_EXCEPTION;
public class ZookeeperDynamicConfiguration extends TreePathDynamicConfiguration {
private Executor executor;
private ZookeeperClient zkClient;
private CacheListener cacheListener;
private static final int DEFAULT_ZK_EXECUTOR_THREADS_NUM = 1;
private static final int DEFAULT_QUEUE = 10000;
private static final Long THREAD_KEEP_ALIVE_TIME = 0L;
ZookeeperDynamicConfiguration(URL url, ZookeeperTransporter zookeeperTransporter) {
super(url);
this.cacheListener = new CacheListener();
final String threadName = this.getClass().getSimpleName();
this.executor = new ThreadPoolExecutor(DEFAULT_ZK_EXECUTOR_THREADS_NUM, DEFAULT_ZK_EXECUTOR_THREADS_NUM,
THREAD_KEEP_ALIVE_TIME, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<>(DEFAULT_QUEUE),
new NamedThreadFactory(threadName, true),
new AbortPolicyWithReport(threadName, url));
zkClient = zookeeperTransporter.connect(url);
boolean isConnected = zkClient.isConnected();
if (!isConnected) {
IllegalStateException illegalStateException =
new IllegalStateException("Failed to connect with zookeeper, pls check if url " + url + " is correct.");
if (logger != null) {
logger.error(CONFIG_FAILED_CONNECT_REGISTRY, "configuration server offline", "",
"Failed to connect with zookeeper", illegalStateException);
}
throw illegalStateException;
}
}
/**
* @param key e.g., {service}.configurators, {service}.tagrouters, {group}.dubbo.properties
* @return
*/
@Override
public String getInternalProperty(String key) {
return zkClient.getContent(buildPathKey("", key));
}
@Override
protected void doClose() throws Exception {
// remove data listener
Map pathKeyListeners = cacheListener.getPathKeyListeners();
for (Map.Entry entry : pathKeyListeners.entrySet()) {
zkClient.removeDataListener(entry.getKey(), entry.getValue());
}
cacheListener.clear();
// zkClient is shared in framework, should not close it here
// zkClient.close();
// See: org.apache.dubbo.remoting.zookeeper.AbstractZookeeperTransporter#destroy()
// All zk clients is created and destroyed in ZookeeperTransporter.
zkClient = null;
}
@Override
protected boolean doPublishConfig(String pathKey, String content) throws Exception {
zkClient.createOrUpdate(pathKey, content, false);
return true;
}
@Override
public boolean publishConfigCas(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 ? 0 : ((Stat) ticket).getVersion());
return true;
} catch (Exception e) {
logger.warn(REGISTRY_ZOOKEEPER_EXCEPTION, "", "", "zookeeper publishConfigCas failed.", e);
return false;
}
}
@Override
protected String doGetConfig(String pathKey) throws Exception {
return zkClient.getContent(pathKey);
}
@Override
public ConfigItem getConfigItem(String key, String group) {
String pathKey = buildPathKey(group, key);
return zkClient.getConfigItem(pathKey);
}
@Override
protected boolean doRemoveConfig(String pathKey) throws Exception {
zkClient.delete(pathKey);
return true;
}
@Override
protected Collection doGetConfigKeys(String groupPath) {
return zkClient.getChildren(groupPath);
}
@Override
protected void doAddListener(String pathKey, ConfigurationListener listener, String key, String group) {
ZookeeperDataListener cachedListener = cacheListener.getCachedListener(pathKey);
if (cachedListener != null) {
cachedListener.addListener(listener);
} else {
ZookeeperDataListener addedListener = cacheListener.addListener(pathKey, listener, key, group);
zkClient.addDataListener(pathKey, addedListener, executor);
}
}
@Override
protected void doRemoveListener(String pathKey, ConfigurationListener listener) {
ZookeeperDataListener zookeeperDataListener = cacheListener.removeListener(pathKey, listener);
if (zookeeperDataListener != null && CollectionUtils.isEmpty(zookeeperDataListener.getListeners())) {
zkClient.removeDataListener(pathKey, zookeeperDataListener);
}
}
}