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 import org.apache.maven.surefire.report.ConsoleLogger;
23
24 import java.util.concurrent.ExecutorService;
25 import java.util.concurrent.Executors;
26
27 /**
28 * The factory of {@link SchedulingStrategy}.
29 *
30 * @author Tibor Digana (tibor17)
31 * @since 2.16
32 */
33 public class SchedulingStrategies
34 {
35
36 /**
37 * @param logger current error logger
38 * @return sequentially executing strategy
39 */
40 public static SchedulingStrategy createInvokerStrategy( ConsoleLogger logger )
41 {
42 return new InvokerStrategy( logger );
43 }
44
45 /**
46 * @param logger current error logger
47 * @param nThreads fixed pool capacity
48 * @return parallel scheduling strategy
49 */
50 public static SchedulingStrategy createParallelStrategy( ConsoleLogger logger, int nThreads )
51 {
52 return new NonSharedThreadPoolStrategy( logger, Executors.newFixedThreadPool( nThreads ) );
53 }
54
55 /**
56 * @param logger current error logger
57 * @return parallel scheduling strategy with unbounded capacity
58 */
59 public static SchedulingStrategy createParallelStrategyUnbounded( ConsoleLogger logger )
60 {
61 return new NonSharedThreadPoolStrategy( logger, Executors.newCachedThreadPool() );
62 }
63
64 /**
65 * The <tt>threadPool</tt> passed to this strategy can be shared in other strategies.
66 * <p/>
67 * The call {@link SchedulingStrategy#finished()} is waiting until own tasks have finished.
68 * New tasks will not be scheduled by this call in this strategy. This strategy is not
69 * waiting for other strategies to finish. The {@link org.junit.runners.model.RunnerScheduler#finished()} may
70 * freely use {@link SchedulingStrategy#finished()}.
71 *
72 * @param logger current error logger
73 * @param threadPool thread pool possibly shared with other strategies
74 * @return parallel strategy with shared thread pool
75 * @throws NullPointerException if <tt>threadPool</tt> is null
76 */
77 public static SchedulingStrategy createParallelSharedStrategy( ConsoleLogger logger, ExecutorService threadPool )
78 {
79 if ( threadPool == null )
80 {
81 throw new NullPointerException( "null threadPool in #createParallelSharedStrategy" );
82 }
83 return new SharedThreadPoolStrategy( logger, threadPool );
84 }
85 }