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1   /**
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4    *
5    * This program and the accompanying materials are dual-licensed under
6    * either the terms of the Eclipse Public License v1.0 as published by
7    * the Eclipse Foundation
8    *
9    *   or (per the licensee's choosing)
10   *
11   * under the terms of the GNU Lesser General Public License version 2.1
12   * as published by the Free Software Foundation.
13   */
14  package ch.qos.logback.core.joran.action;
15  
16  import ch.qos.logback.core.spi.ContextAware;
17  import org.xml.sax.Attributes;
18  
19  import ch.qos.logback.core.joran.spi.ActionException;
20  import ch.qos.logback.core.joran.spi.InterpretationContext;
21  import ch.qos.logback.core.spi.LifeCycle;
22  import ch.qos.logback.core.status.StatusListener;
23  import ch.qos.logback.core.util.OptionHelper;
24  
25  public class StatusListenerAction extends Action {
26  
27      boolean inError = false;
28      Boolean effectivelyAdded = null;
29      StatusListener statusListener = null;
30  
31      public void begin(InterpretationContext ec, String name, Attributes attributes) throws ActionException {
32          inError = false;
33          effectivelyAdded = null;
34          String className = attributes.getValue(CLASS_ATTRIBUTE);
35          if (OptionHelper.isEmpty(className)) {
36              addError("Missing class name for statusListener. Near [" + name + "] line " + getLineNumber(ec));
37              inError = true;
38              return;
39          }
40  
41          try {
42              statusListener = (StatusListener) OptionHelper.instantiateByClassName(className, StatusListener.class, context);
43              effectivelyAdded = ec.getContext().getStatusManager().add(statusListener);
44              if (statusListener instanceof ContextAware) {
45                  ((ContextAware) statusListener).setContext(context);
46              }
47              addInfo("Added status listener of type [" + className + "]");
48              ec.pushObject(statusListener);
49          } catch (Exception e) {
50              inError = true;
51              addError("Could not create an StatusListener of type [" + className + "].", e);
52              throw new ActionException(e);
53          }
54  
55      }
56  
57      public void finish(InterpretationContext ec) {
58      }
59  
60      public void end(InterpretationContext ec, String e) {
61          if (inError) {
62              return;
63          }
64          if (isEffectivelyAdded() && statusListener instanceof LifeCycle) {
65              ((LifeCycle) statusListener).start();
66          }
67          Object o = ec.peekObject();
68          if (o != statusListener) {
69              addWarn("The object at the of the stack is not the statusListener pushed earlier.");
70          } else {
71              ec.popObject();
72          }
73      }
74  
75      private boolean isEffectivelyAdded() {
76          if (effectivelyAdded == null)
77              return false;
78          return effectivelyAdded;
79      }
80  }