/* * 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_ASYNC_APPENDER_H #define _LOG4CXX_ASYNC_APPENDER_H #if defined(_MSC_VER) #pragma warning ( push ) #pragma warning ( disable: 4231 4251 4275 4786 ) #endif #include #include #include #include #include #include #include namespace log4cxx { LOG4CXX_LIST_DEF(LoggingEventList, log4cxx::spi::LoggingEventPtr); /** The AsyncAppender lets users log events asynchronously. It uses a bounded buffer to store logging events.

The AsyncAppender will collect the events sent to it and then dispatch them to all the appenders that are attached to it. You can attach multiple appenders to an AsyncAppender.

The AsyncAppender uses a separate thread to serve the events in its bounded buffer.

Important note: The AsyncAppender can only be script configured using the {@link xml::DOMConfigurator DOMConfigurator}. */ class LOG4CXX_EXPORT AsyncAppender : public virtual spi::AppenderAttachable, public virtual AppenderSkeleton { public: DECLARE_LOG4CXX_OBJECT(AsyncAppender) BEGIN_LOG4CXX_CAST_MAP() LOG4CXX_CAST_ENTRY(AsyncAppender) LOG4CXX_CAST_ENTRY_CHAIN(AppenderSkeleton) LOG4CXX_CAST_ENTRY(spi::AppenderAttachable) END_LOG4CXX_CAST_MAP() /** * Create new instance. */ AsyncAppender(); /** * Destructor. */ virtual ~AsyncAppender(); void addRef() const; void releaseRef() const; /** * Add appender. * * @param newAppender appender to add, may not be null. */ void addAppender(const AppenderPtr& newAppender); void append(const spi::LoggingEventPtr& event, log4cxx::helpers::Pool& p); /** Close this AsyncAppender by interrupting the dispatcher thread which will process all pending events before exiting. */ void close(); /** * Get iterator over attached appenders. * @return list of all attached appenders. */ AppenderList getAllAppenders() const; /** * Get appender by name. * * @param name name, may not be null. * @return matching appender or null. */ AppenderPtr getAppender(const LogString& name) const; /** * Gets whether the location of the logging request call * should be captured. * * @return the current value of the LocationInfo option. */ bool getLocationInfo() const; /** * Determines if specified appender is attached. * @param appender appender. * @return true if attached. */ bool isAttached(const AppenderPtr& appender) const; virtual bool requiresLayout() const; /** * Removes and closes all attached appenders. */ void removeAllAppenders(); /** * Removes an appender. * @param appender appender to remove. */ void removeAppender(const AppenderPtr& appender); /** * Remove appender by name. * @param name name. */ void removeAppender(const LogString& name); /** * The LocationInfo attribute is provided for compatibility * with log4j and has no effect on the log output. * @param flag new value. */ void setLocationInfo(bool flag); /** * The BufferSize option takes a non-negative integer value. * This integer value determines the maximum size of the bounded * buffer. * */ void setBufferSize(int size); /** * Gets the current buffer size. * @return the current value of the BufferSize option. */ int getBufferSize() const; /** * Sets whether appender should wait if there is no * space available in the event buffer or immediately return. * * @param value true if appender should wait until available space in buffer. */ void setBlocking(bool value); /** * Gets whether appender should block calling thread when buffer is full. * If false, messages will be counted by logger and a summary * message appended after the contents of the buffer have been appended. * * @return true if calling thread will be blocked when buffer is full. */ bool getBlocking() const; /** * Set appender properties by name. * @param option property name. * @param value property value. */ void setOption(const LogString& option, const LogString& value); private: AsyncAppender(const AsyncAppender&); AsyncAppender& operator=(const AsyncAppender&); /** * The default buffer size is set to 128 events. */ enum { DEFAULT_BUFFER_SIZE = 128 }; /** * Event buffer. */ LoggingEventList buffer; /** * Mutex used to guard access to buffer and discardMap. */ ::log4cxx::helpers::Mutex bufferMutex; ::log4cxx::helpers::Condition bufferNotFull; ::log4cxx::helpers::Condition bufferNotEmpty; class DiscardSummary { private: /** * First event of the highest severity. */ ::log4cxx::spi::LoggingEventPtr maxEvent; /** * Total count of messages discarded. */ int count; public: /** * Create new instance. * * @param event event, may not be null. */ DiscardSummary(const ::log4cxx::spi::LoggingEventPtr& event); /** Copy constructor. */ DiscardSummary(const DiscardSummary& src); /** Assignment operator. */ DiscardSummary& operator=(const DiscardSummary& src); /** * Add discarded event to summary. * * @param event event, may not be null. */ void add(const ::log4cxx::spi::LoggingEventPtr& event); /** * Create event with summary information. * * @return new event. */ ::log4cxx::spi::LoggingEventPtr createEvent(::log4cxx::helpers::Pool& p); }; /** * Map of DiscardSummary objects keyed by logger name. */ typedef std::map DiscardMap; DiscardMap* discardMap; /** * Buffer size. */ int bufferSize; /** * Nested appenders. */ helpers::AppenderAttachableImplPtr appenders; /** * Dispatcher. */ helpers::Thread dispatcher; /** * Should location info be included in dispatched messages. */ bool locationInfo; /** * Does appender block when buffer is full. */ bool blocking; /** * Dispatch routine. */ static void* LOG4CXX_THREAD_FUNC dispatch(apr_thread_t* thread, void* data); }; // class AsyncAppender LOG4CXX_PTR_DEF(AsyncAppender); } // namespace log4cxx #if defined(_MSC_VER) #pragma warning ( pop ) #endif #endif// _LOG4CXX_ASYNC_APPENDER_H