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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.migration;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.config.configcenter.ConfigChangedEvent;
import org.apache.dubbo.common.config.configcenter.ConfigurationListener;
import org.apache.dubbo.common.config.configcenter.DynamicConfiguration;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.ConcurrentHashSet;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.registry.integration.RegistryProtocol;
import org.apache.dubbo.registry.integration.RegistryProtocolListener;
import org.apache.dubbo.rpc.Exporter;
import org.apache.dubbo.rpc.cluster.ClusterInvoker;
import org.apache.dubbo.rpc.cluster.support.migration.MigrationRule;
import org.apache.dubbo.rpc.model.ApplicationModel;
import java.util.Optional;
import java.util.Set;
import static org.apache.dubbo.common.constants.RegistryConstants.INIT;
@Activate
public class MigrationRuleListener implements RegistryProtocolListener, ConfigurationListener {
private static final Logger logger = LoggerFactory.getLogger(MigrationRuleListener.class);
private Set listeners = new ConcurrentHashSet<>();
private DynamicConfiguration configuration;
private volatile String rawRule;
public MigrationRuleListener() {
Optional optional = ApplicationModel.getEnvironment().getDynamicConfiguration();
if (optional.isPresent()) {
this.configuration = optional.get();
logger.info("Listening for migration rules on dataId-" + MigrationRule.RULE_KEY + " group-" + MigrationRule.DUBBO_SERVICEDISCOVERY_MIGRATION_GROUP);
configuration.addListener(MigrationRule.RULE_KEY, MigrationRule.DUBBO_SERVICEDISCOVERY_MIGRATION_GROUP, this);
rawRule = configuration.getConfig(MigrationRule.RULE_KEY, MigrationRule.DUBBO_SERVICEDISCOVERY_MIGRATION_GROUP);
if (StringUtils.isEmpty(rawRule)) {
rawRule = INIT;
}
} else {
if (logger.isWarnEnabled()) {
logger.warn("config center is not configured!");
}
rawRule = INIT;
}
process(new ConfigChangedEvent(MigrationRule.RULE_KEY, MigrationRule.DUBBO_SERVICEDISCOVERY_MIGRATION_GROUP, rawRule));
}
@Override
public synchronized void process(ConfigChangedEvent event) {
rawRule = event.getContent();
if (StringUtils.isEmpty(rawRule)) {
logger.warn("Received empty migration rule, will ignore.");
return;
}
logger.info("Using the following migration rule to migrate:");
logger.info(rawRule);
if (CollectionUtils.isNotEmpty(listeners)) {
listeners.forEach(listener -> listener.doMigrate(rawRule));
}
}
@Override
public synchronized void onExport(RegistryProtocol registryProtocol, Exporter exporter) {
}
@Override
public synchronized void onRefer(RegistryProtocol registryProtocol, ClusterInvoker invoker, URL url) {
MigrationInvoker migrationInvoker = (MigrationInvoker) invoker;
MigrationRuleHandler migrationListener = new MigrationRuleHandler<>(migrationInvoker);
listeners.add(migrationListener);
migrationListener.doMigrate(rawRule);
}
@Override
public void onDestroy() {
if (null != configuration) {
configuration.removeListener(MigrationRule.RULE_KEY, MigrationRule.DUBBO_SERVICEDISCOVERY_MIGRATION_GROUP, this);
}
}
}