001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.spi; 018 019import java.util.List; 020 021/** 022 * Allows SPIs to implement custom server list strategies for the Service Call EIP. 023 * 024 * @see ServiceCallLoadBalancer 025 * @see ServiceCallServer 026 */ 027public interface ServiceCallServerListStrategy<T extends ServiceCallServer> { 028 029 /** 030 * Gets the initial list of servers. 031 * <p/> 032 * This method may return <tt>null</tt> or an empty list. 033 * 034 * @param name the service name 035 */ 036 List<T> getInitialListOfServers(String name); 037 038 /** 039 * Gets the updated list of servers. 040 * <p/> 041 * This method can either be called on-demand prior to a service call, or have 042 * a background job that is scheduled to update the list, or a watcher 043 * that triggers when the list of servers changes. 044 * 045 * @param name the service name 046 */ 047 List<T> getUpdatedListOfServers(String name); 048 049}