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1   /**
2    * Copyright (c) 2004-2021 QOS.ch
3    * All rights reserved.
4    *
5    * Permission is hereby granted, free of charge, to any person obtaining
6    * a copy of this software and associated documentation files (the
7    * "Software"), to  deal in  the Software without  restriction, including
8    * without limitation  the rights to  use, copy, modify,  merge, publish,
9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
10   * permit persons to whom the Software  is furnished to do so, subject to
11   * the following conditions:
12   *
13   * The  above  copyright  notice  and  this permission  notice  shall  be
14   * included in all copies or substantial portions of the Software.
15   *
16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23   *
24   */
25  package org.slf4j.simple.multiThreadedExecution;
26  
27  import java.io.PrintStream;
28  
29  import org.junit.After;
30  import org.junit.Before;
31  import org.junit.Test;
32  import org.slf4j.Logger;
33  import org.slf4j.LoggerFactory;
34  
35  /**
36   * Tests that output in multi-threaded environments is not mingled.
37   * 
38   * See also https://jira.qos.ch/browse/SLF4J-515
39   */
40  public class MultithereadedExecutionTest {
41  
42      private static final int THREAD_COUNT = 2;
43      private final Thread[] threads = new Thread[THREAD_COUNT];
44  
45      private static final long TEST_DURATION_IN_MILLIS = 100;
46      
47      private final PrintStream oldOut = System.out;
48      StateCheckingPrintStream scps = new StateCheckingPrintStream(oldOut);
49  
50      volatile boolean signal = false;
51  
52      @Before
53      public void setup() {
54          System.setErr(scps);
55          // System.setProperty(SimpleLogger.LOG_FILE_KEY, "System.err");
56          // LoggerFactoryFriend.reset();
57      }
58  
59      @After
60      public void tearDown() throws Exception {
61          // LoggerFactoryFriend.reset();
62          // System.clearProperty(SimpleLogger.LOG_FILE_KEY);
63          System.setErr(oldOut);
64      }
65  
66      @Test
67      public void test() throws Throwable {
68          WithException withException = new WithException();
69          Other other = new Other();
70          threads[0] = new Thread(withException);
71          threads[1] = new Thread(other);
72          threads[0].start();
73          threads[1].start();
74          Thread.sleep(TEST_DURATION_IN_MILLIS);
75          signal = true;
76          threads[0].join();
77          threads[1].join();
78  
79          if (withException.throwable != null) {
80              throw withException.throwable;
81          }
82  
83          if (other.throwable != null) {
84              throw other.throwable;
85          }
86  
87      }
88  
89      class WithException implements Runnable {
90  
91          volatile Throwable throwable;
92          Logger logger = LoggerFactory.getLogger(WithException.class);
93  
94          @Override
95          public void run() { // TODO Auto-generated method stub
96              int i = 0;
97  
98              while (!signal) {
99                  try {
100                     logger.info("Hello {}", i, new Throwable("i=" + i));
101                     i++;
102                 } catch (Throwable t) {
103                     throwable = t;
104                     MultithereadedExecutionTest.this.signal = true;
105                     return;
106                 }
107             }
108 
109         }
110     }
111 
112     class Other implements Runnable {
113         volatile Throwable throwable;
114         Logger logger = LoggerFactory.getLogger(Other.class);
115 
116         @Override
117         public void run() {
118             int i = 0;
119             while (!signal) {
120                 try {
121                     logger.info("Other {}", i++);
122                 } catch (Throwable t) {
123                     throwable = t;
124                     MultithereadedExecutionTest.this.signal = true;
125                     return;
126                 }
127             }
128         }
129     }
130 
131 }