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.impl.cloud; 018 019import java.util.List; 020import java.util.concurrent.ThreadLocalRandom; 021 022import org.apache.camel.cloud.ServiceChooser; 023import org.apache.camel.cloud.ServiceDefinition; 024import org.apache.camel.util.ObjectHelper; 025 026public class RandomServiceChooser implements ServiceChooser { 027 @Override 028 public ServiceDefinition choose(List<ServiceDefinition> definitions) { 029 // Fail if the service definition list is null or empty 030 if (ObjectHelper.isEmpty(definitions)) { 031 throw new IllegalArgumentException("The ServiceDefinition list should not be empty"); 032 } 033 034 int size = definitions.size(); 035 if (size == 1) { 036 return definitions.get(0); 037 } else { 038 return definitions.get(ThreadLocalRandom.current().nextInt(size)); 039 } 040 } 041 042 @Override 043 public String toString() { 044 return "RandomServiceChooser"; 045 } 046}