1 package org.apache.maven.plugin.surefire.booterclient.lazytestprovider;
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.io.IOException;
23 import java.io.InputStream;
24
25 import static java.util.Objects.requireNonNull;
26
27 /**
28 * Reader stream sends bytes to forked jvm std-{@link InputStream input-stream}.
29 *
30 * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
31 * @since 2.19
32 */
33 public abstract class AbstractForkInputStream
34 extends InputStream
35 implements NotifiableTestStream
36 {
37 private volatile FlushReceiverProvider flushReceiverProvider;
38
39 /**
40 * @param flushReceiverProvider the provider for a flush receiver.
41 */
42 public void setFlushReceiverProvider( FlushReceiverProvider flushReceiverProvider )
43 {
44 this.flushReceiverProvider = requireNonNull( flushReceiverProvider );
45 }
46
47 protected boolean tryFlush()
48 throws IOException
49 {
50 if ( flushReceiverProvider != null )
51 {
52 FlushReceiver flushReceiver = flushReceiverProvider.getFlushReceiver();
53 if ( flushReceiver != null )
54 {
55 flushReceiver.flush();
56 return true;
57 }
58 }
59 return false;
60 }
61 }