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18 package org.apache.log4j.varia;
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20 import org.apache.log4j.spi.ErrorHandler;
21 import org.apache.log4j.spi.LoggingEvent;
22 import org.apache.log4j.Appender;
23 import org.apache.log4j.Logger;
24 import org.apache.log4j.helpers.LogLog;
25 import java.util.Vector;
26 import java.io.InterruptedIOException;
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40 public class FallbackErrorHandler implements ErrorHandler {
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43 Appender backup;
44 Appender primary;
45 Vector loggers;
46
47 public FallbackErrorHandler() {
48 }
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55 public
56 void setLogger(Logger logger) {
57 LogLog.debug("FB: Adding logger [" + logger.getName() + "].");
58 if(loggers == null) {
59 loggers = new Vector();
60 }
61 loggers.addElement(logger);
62 }
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68 public
69 void activateOptions() {
70 }
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76 public
77 void error(String message, Exception e, int errorCode) {
78 error(message, e, errorCode, null);
79 }
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85 public
86 void error(String message, Exception e, int errorCode, LoggingEvent event) {
87 if (e instanceof InterruptedIOException) {
88 Thread.currentThread().interrupt();
89 }
90 LogLog.debug("FB: The following error reported: " + message, e);
91 LogLog.debug("FB: INITIATING FALLBACK PROCEDURE.");
92 if (loggers != null) {
93 for(int i = 0; i < loggers.size(); i++) {
94 Logger l = (Logger) loggers.elementAt(i);
95 LogLog.debug("FB: Searching for ["+primary.getName()+"] in logger ["
96 +l.getName() + "].");
97 LogLog.debug("FB: Replacing ["+primary.getName()+"] by ["
98 + backup.getName() + "] in logger ["+ l.getName() +"].");
99 l.removeAppender(primary);
100 LogLog.debug("FB: Adding appender ["+backup.getName()+"] to logger "
101 + l.getName());
102 l.addAppender(backup);
103 }
104 }
105 }
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112 public
113 void error(String message) {
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118 }
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123 public
124 void setAppender(Appender primary) {
125 LogLog.debug("FB: Setting primary appender to [" + primary.getName() + "].");
126 this.primary = primary;
127 }
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132 public
133 void setBackupAppender(Appender backup) {
134 LogLog.debug("FB: Setting backup appender to [" + backup.getName() + "].");
135 this.backup = backup;
136 }
137
138 }