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+/*
+ * 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.
+ */
+
+#ifndef _LOG4CXX_VARIA_FALLBACK_ERROR_HANDLER_H
+#define _LOG4CXX_VARIA_FALLBACK_ERROR_HANDLER_H
+
+#include <log4cxx/spi/errorhandler.h>
+#include <log4cxx/helpers/objectimpl.h>
+#include <log4cxx/appender.h>
+#include <log4cxx/logger.h>
+#include <vector>
+
+namespace log4cxx
+{
+ namespace varia
+ {
+ /**
+ 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.
+ */
+ class LOG4CXX_EXPORT FallbackErrorHandler :
+ public virtual spi::ErrorHandler,
+ public virtual helpers::ObjectImpl
+ {
+ private:
+ AppenderPtr backup;
+ AppenderPtr primary;
+ std::vector<LoggerPtr> loggers;
+
+ public:
+ DECLARE_LOG4CXX_OBJECT(FallbackErrorHandler)
+ BEGIN_LOG4CXX_CAST_MAP()
+ LOG4CXX_CAST_ENTRY(spi::OptionHandler)
+ LOG4CXX_CAST_ENTRY(spi::ErrorHandler)
+ END_LOG4CXX_CAST_MAP()
+
+ FallbackErrorHandler();
+ void addRef() const;
+ void releaseRef() const;
+
+
+ /**
+ <em>Adds</em> the logger passed as parameter to the list of
+ loggers that we need to search for in case of appender failure.
+ */
+ void setLogger(const LoggerPtr& logger);
+
+
+ /**
+ No options to activate.
+ */
+ void activateOptions(log4cxx::helpers::Pool& p);
+ void setOption(const LogString& option, const LogString& value);
+
+
+ /**
+ Prints the message and the stack trace of the exception on
+ <code>System.err</code>.
+ */
+ void error(const LogString& message, const std::exception& e,
+ int errorCode) const;
+
+ /**
+ Prints the message and the stack trace of the exception on
+ <code>System.err</code>.
+ */
+ void error(const LogString& message, const std::exception& e,
+ int errorCode, const spi::LoggingEventPtr& event) const;
+
+
+ /**
+ Print a the error message passed as parameter on
+ <code>System.err</code>.
+ */
+ void error(const LogString& /* message */) const {}
+
+ /**
+ Return the backup appender.
+ */
+ const AppenderPtr& getBackupAppender() const
+ { return backup; }
+
+ /**
+ The appender to which this error handler is attached.
+ */
+ void setAppender(const AppenderPtr& primary);
+
+ /**
+ Set the backup appender.
+ */
+ void setBackupAppender(const AppenderPtr& backup);
+ };
+ } // namespace varia
+} // namespace log4cxx
+
+#endif //_LOG4CXX_VARIA_FALLBACK_ERROR_HANDLER_H
+