forked from apache/dubbo
/
MigrationRule.java
109 lines (88 loc) · 4.01 KB
/
MigrationRule.java
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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.rpc.cluster.support.migration;
import org.apache.dubbo.common.config.configcenter.DynamicConfiguration;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.PojoUtils;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.rpc.model.ApplicationModel;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.SafeConstructor;
import java.util.Map;
import java.util.Optional;
import static org.apache.dubbo.common.constants.RegistryConstants.INIT;
public class MigrationRule {
private static final Logger LOGGER = LoggerFactory.getLogger(MigrationRule.class);
private static final String DUBBO_SERVICEDISCOVERY_MIGRATION_KEY = "dubbo.application.service-discovery.migration";
public static final String DUBBO_SERVICEDISCOVERY_MIGRATION_GROUP = "MIGRATION";
public static final String RULE_KEY = ApplicationModel.getName() + ".migration";
private static DynamicConfiguration configuration = null;
static {
Optional<DynamicConfiguration> optional = ApplicationModel.getEnvironment().getDynamicConfiguration();
optional.ifPresent(dynamicConfiguration -> configuration = dynamicConfiguration);
}
private String key;
private MigrationStep step = MigrationStep.FORCE_INTERFACE;
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public MigrationStep getStep() {
return step;
}
public void setStep(MigrationStep step) {
this.step = step;
}
public static MigrationRule parse(String rawRule) {
if (null == configuration) {
return getMigrationRule(null);
}
if (StringUtils.isBlank(rawRule) || INIT.equals(rawRule)) {
String step = (String)configuration.getInternalProperty(DUBBO_SERVICEDISCOVERY_MIGRATION_KEY);
return getMigrationRule(step);
}
Yaml yaml = new Yaml(new SafeConstructor());
MigrationRule migrationRule = null;
try {
Map<String, Object> map = yaml.load(rawRule);
migrationRule = PojoUtils.mapToPojo(map, MigrationRule.class);
if (null == migrationRule.getStep()) {
LOGGER.warn("Failed to parse migrationRule, step is empty, automatically switch to APPLICATION_FIRST.");
migrationRule = getMigrationRule(null);
}
} catch (Exception e) {
LOGGER.error("Failed to parse migrationRule, automatically switch to APPLICATION_FIRST.");
migrationRule = getMigrationRule(null);
}
return migrationRule;
}
public static MigrationRule queryRule() {
if (null == configuration) {
return getMigrationRule(null);
}
String rawRule = configuration.getConfig(MigrationRule.RULE_KEY, DUBBO_SERVICEDISCOVERY_MIGRATION_GROUP);
return parse(rawRule);
}
private static MigrationRule getMigrationRule(String step) {
MigrationRule rule = new MigrationRule();
rule.setStep(Enum.valueOf(MigrationStep.class, StringUtils.isBlank(step) ? MigrationStep.APPLICATION_FIRST.name() : step));
return rule;
}
}