handlers/handler-loadbalance/src/main/java/org/apache/servicecomb/loadbalance/ExtensionsManager.java

/*
 * 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.servicecomb.loadbalance;

import java.util.List;

public class ExtensionsManager {
  private final List<ExtensionsFactory> extensionsFactories;

  public ExtensionsManager(List<ExtensionsFactory> extensionsFactories) {
    this.extensionsFactories = extensionsFactories;
  }

  public RuleExt createLoadBalancerRule(String ruleStrategyName) {
    RuleExt rule = null;

    for (ExtensionsFactory factory : extensionsFactories) {
      if (factory.isSupport(Configuration.RULE_STRATEGY_NAME, ruleStrategyName)) {
        rule = factory.createLoadBalancerRule(ruleStrategyName);
        break;
      }
    }

    if (rule == null) {
      rule = new RoundRobinRuleExt();
    }

    return rule;
  }
}