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.cloud; 018 019import java.util.Collection; 020import java.util.Collections; 021import java.util.Map; 022import java.util.Optional; 023 024import org.apache.camel.CamelContextAware; 025import org.apache.camel.Ordered; 026import org.apache.camel.Service; 027import org.apache.camel.spi.IdAware; 028 029public interface ServiceRegistry extends Service, CamelContextAware, IdAware, Ordered { 030 031 @Override 032 default int getOrder() { 033 return Ordered.LOWEST; 034 } 035 036 /** 037 * Attributes associated to the service. 038 */ 039 default Map<String, Object> getAttributes() { 040 return Collections.emptyMap(); 041 } 042 043 /** 044 * Register the service definition. 045 * 046 * @param definition the service definition 047 */ 048 void register(ServiceDefinition definition); 049 050 051 /** 052 * Remove the service definition. 053 * 054 * @param definition the service definition 055 */ 056 void deregister(ServiceDefinition definition); 057 058 /** 059 * A selector used to pick up a service among a list. 060 */ 061 @FunctionalInterface 062 interface Selector { 063 /** 064 * Select a specific ServiceRegistry instance among a collection. 065 */ 066 Optional<ServiceRegistry> select(Collection<ServiceRegistry> services); 067 } 068}