org.apache.dubbo.registry.client.migration.DefaultMigrationAddressComparator Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of dubbo Show documentation
Show all versions of dubbo Show documentation
The all in one project of dubbo
/*
* 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.config.ConfigurationUtils;
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.rpc.Invoker;
import org.apache.dubbo.rpc.cluster.ClusterInvoker;
import java.util.List;
public class DefaultMigrationAddressComparator implements MigrationAddressComparator {
private static final Logger logger = LoggerFactory.getLogger(DefaultMigrationAddressComparator.class);
private static final String MIGRATION_THRESHOLD = "dubbo.application.migration.threshold";
private static final String DEFAULT_THRESHOLD_STRING = "0.8";
private static final float DEFAULT_THREAD = 0.8f;
@Override
public boolean shouldMigrate(ClusterInvoker serviceDiscoveryInvoker, ClusterInvoker invoker) {
if (!serviceDiscoveryInvoker.isAvailable()) {
logger.info("No instance address available, will not migrate.");
return false;
}
if (!invoker.isAvailable()) {
logger.info("No interface address available, will migrate.");
return true;
}
List> invokers1 = serviceDiscoveryInvoker.getDirectory().getAllInvokers();
List> invokers2 = invoker.getDirectory().getAllInvokers();
int newAddressSize = CollectionUtils.isNotEmpty(invokers1) ? invokers1.size() : 0;
int oldAddressSize = CollectionUtils.isNotEmpty(invokers2) ? invokers2.size() : 0;
String rawThreshold = ConfigurationUtils.getDynamicProperty(MIGRATION_THRESHOLD, DEFAULT_THRESHOLD_STRING);
float threshold;
try {
threshold = Float.parseFloat(rawThreshold);
} catch (Exception e) {
logger.error("Invalid migration threshold " + rawThreshold);
threshold = DEFAULT_THREAD;
}
logger.info("Instance address size " + newAddressSize + ", interface address size " + oldAddressSize + ", threshold " + threshold);
if (newAddressSize != 0 && oldAddressSize == 0) {
return true;
}
if (newAddressSize == 0 && oldAddressSize == 0) {
return false;
}
if (((float)newAddressSize / (float)oldAddressSize) >= threshold) {
return true;
}
return false;
}
}