1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.util.log;
20
21 /**
22 * A try-with-resources compatible layer for {@link StdErrLog#setHideStacks(boolean) hiding stacktraces} within the scope of the <code>try</code> block when
23 * logging with {@link StdErrLog} implementation.
24 * <p>
25 * Use of other logging implementation cause no effect when using this class
26 * <p>
27 * Example:
28 *
29 * <pre>
30 * try (StacklessLogging scope = new StacklessLogging(EventDriver.class,Noisy.class))
31 * {
32 * doActionThatCausesStackTraces();
33 * }
34 * </pre>
35 */
36 public class StacklessLogging implements AutoCloseable
37 {
38 private final Class<?> clazzes[];
39
40 public StacklessLogging(Class<?>... classesToSquelch)
41 {
42 this.clazzes = classesToSquelch;
43 hideStacks(true);
44 }
45
46 @Override
47 public void close() throws Exception
48 {
49 hideStacks(false);
50 }
51
52 private void hideStacks(boolean hide)
53 {
54 for (Class<?> clazz : clazzes)
55 {
56 Logger log = Log.getLogger(clazz);
57 if (log == null)
58 {
59 // not interested in classes without loggers
60 continue;
61 }
62 if (log instanceof StdErrLog)
63 {
64 // only operate on loggers that are of type StdErrLog
65 ((StdErrLog)log).setHideStacks(hide);
66 }
67 }
68 }
69 }