JAL-3541 selectively merged build.gradle and gradle.properties

[jalview.git] / srcjar_unused / org / apache / log4j / varia / FallbackErrorHandler.java

diff --git a/srcjar_unused/org/apache/log4j/varia/FallbackErrorHandler.java b/srcjar_unused/org/apache/log4j/varia/FallbackErrorHandler.java
new file mode 100644 (file)
index 0000000..7cbc87d
--- /dev/null
+++ b/srcjar_unused/org/apache/log4j/varia/FallbackErrorHandler.java
@@ -0,0 +1,138 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+package org.apache.log4j.varia;
+
+import  org.apache.log4j.spi.ErrorHandler;
+import  org.apache.log4j.spi.LoggingEvent;
+import  org.apache.log4j.Appender;
+import  org.apache.log4j.Logger;
+import  org.apache.log4j.helpers.LogLog;
+import java.util.Vector;
+import java.io.InterruptedIOException;
+
+/**
+  *
+  * The <code>FallbackErrorHandler</code> implements the ErrorHandler
+  * interface such that a secondary appender may be specified.  This
+  * secondary appender takes over if the primary appender fails for
+  * whatever reason.
+  *
+  * <p>The error message is printed on <code>System.err</code>, and
+  * logged in the new secondary appender.
+  *
+  * @author Ceki G&uuml;c&uuml;
+  * */
+public class FallbackErrorHandler implements ErrorHandler {
+
+
+  Appender backup;
+  Appender primary;
+  Vector loggers;
+
+  public FallbackErrorHandler() {
+  }
+  
+
+  /**
+     <em>Adds</em> the logger passed as parameter to the list of
+     loggers that we need to search for in case of appender failure.
+  */
+  public 
+  void setLogger(Logger logger) {
+    LogLog.debug("FB: Adding logger [" + logger.getName() + "].");
+    if(loggers == null) {
+      loggers = new Vector();
+    }
+    loggers.addElement(logger);
+  }
+
+
+  /**
+     No options to activate.
+  */
+  public 
+  void activateOptions() {
+  }
+
+
+  /**
+     Prints the message and the stack trace of the exception on
+     <code>System.err</code>.  */
+  public
+  void error(String message, Exception e, int errorCode) { 
+    error(message, e, errorCode, null);
+  }
+
+  /**
+     Prints the message and the stack trace of the exception on
+     <code>System.err</code>.
+   */
+  public
+  void error(String message, Exception e, int errorCode, LoggingEvent event) {
+    if (e instanceof InterruptedIOException) {
+        Thread.currentThread().interrupt();
+    }
+    LogLog.debug("FB: The following error reported: " + message, e);
+    LogLog.debug("FB: INITIATING FALLBACK PROCEDURE.");
+    if (loggers != null) {
+       for(int i = 0; i < loggers.size(); i++) {
+               Logger l = (Logger) loggers.elementAt(i);
+               LogLog.debug("FB: Searching for ["+primary.getName()+"] in logger ["
+                               +l.getName() + "].");
+               LogLog.debug("FB: Replacing ["+primary.getName()+"] by ["
+                               + backup.getName() + "] in logger ["+ l.getName() +"].");
+               l.removeAppender(primary);
+               LogLog.debug("FB: Adding appender ["+backup.getName()+"] to logger "
+                               +  l.getName());
+               l.addAppender(backup);
+        }
+    }    
+  }
+
+
+  /**
+     Print a the error message passed as parameter on
+     <code>System.err</code>.  
+  */
+  public 
+  void error(String message) {
+    //if(firstTime) {
+    //LogLog.error(message);
+    //firstTime = false;
+    //}
+  }
+  
+  /**
+     The appender to which this error handler is attached.
+   */
+  public
+  void setAppender(Appender primary) {
+    LogLog.debug("FB: Setting primary appender to [" + primary.getName() + "].");
+    this.primary = primary;
+  }
+
+  /**
+     Set the backup appender.
+   */
+  public
+  void setBackupAppender(Appender backup) {
+    LogLog.debug("FB: Setting backup appender to [" + backup.getName() + "].");
+    this.backup = backup;
+  }
+  
+}