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