1 package org.apache.maven.surefire.junitcore.pc; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 /** 23 * @author Tibor Digana (tibor17) 24 * @see Balancer 25 * @since 2.16 26 */ 27 public class BalancerFactory 28 { 29 private BalancerFactory() 30 { 31 } 32 33 /** 34 * Infinite permits. 35 * @return Balancer wih infinite permits 36 */ 37 public static Balancer createInfinitePermitsBalancer() 38 { 39 return balancer( 0, false ); 40 } 41 42 /** 43 * Balancer without fairness. 44 * Fairness guarantees the waiting schedulers to wake up in order they acquired a permit. 45 * 46 * @param concurrency number of permits to acquire when maintaining concurrency on tests 47 * @return Balancer with given number of permits 48 */ 49 public static Balancer createBalancer( int concurrency ) 50 { 51 return balancer( concurrency, false ); 52 } 53 54 /** 55 * Balancer with fairness. 56 * Fairness guarantees the waiting schedulers to wake up in order they acquired a permit. 57 * 58 * @param concurrency number of permits to acquire when maintaining concurrency on tests 59 * @return Balancer with given number of permits 60 */ 61 public static Balancer createBalancerWithFairness( int concurrency ) 62 { 63 return balancer( concurrency, true ); 64 } 65 66 private static Balancer balancer( int concurrency, boolean fairness ) 67 { 68 boolean shouldBalance = concurrency > 0 && concurrency < Integer.MAX_VALUE; 69 return shouldBalance ? new ThreadResourcesBalancer( concurrency, fairness ) : new NullBalancer(); 70 } 71 }