src/main/cpp/socketappenderskeleton.cpp

/*
 * 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.
 */
#if defined(_MSC_VER)
	#pragma warning ( disable: 4231 4251 4275 4786 )
#endif

#define __STDC_CONSTANT_MACROS
#include <log4cxx/net/socketappenderskeleton.h>
#include <log4cxx/helpers/loglog.h>
#include <log4cxx/helpers/optionconverter.h>
#include <log4cxx/helpers/stringhelper.h>
#include <log4cxx/spi/loggingevent.h>
#include <log4cxx/helpers/transcoder.h>
#include <log4cxx/helpers/bytearrayoutputstream.h>
#include <functional>

using namespace log4cxx;
using namespace log4cxx::helpers;
using namespace log4cxx::net;

SocketAppenderSkeleton::SocketAppenderSkeleton(int defaultPort, int reconnectionDelay1)
	:  remoteHost(),
	   address(),
	   port(defaultPort),
	   reconnectionDelay(reconnectionDelay1),
	   locationInfo(false),
       thread()
{
}

SocketAppenderSkeleton::SocketAppenderSkeleton(InetAddressPtr address1, int port1, int delay)
	:
	remoteHost(),
	address(address1),
	port(port1),
	reconnectionDelay(delay),
	locationInfo(false),
	thread()
{
	remoteHost = this->address->getHostName();
}

SocketAppenderSkeleton::SocketAppenderSkeleton(const LogString& host, int port1, int delay)
	:   remoteHost(host),
		address(InetAddress::getByName(host)),
		port(port1),
		reconnectionDelay(delay),
		locationInfo(false),
		thread()
{
}

SocketAppenderSkeleton::~SocketAppenderSkeleton()
{
    finalize();
}

void SocketAppenderSkeleton::activateOptions(Pool& p)
{
	AppenderSkeleton::activateOptions(p);
	connect(p);
}

void SocketAppenderSkeleton::close()
{
	log4cxx::unique_lock<log4cxx::shared_mutex> lock(mutex);

	if (closed)
	{
		return;
	}

	closed = true;
	cleanUp(pool);

    {
		log4cxx::unique_lock<log4cxx::mutex> lock2(interrupt_mutex);
        interrupt.notify_all();
    }

    if( thread.joinable() ){
        thread.join();
    }
}

void SocketAppenderSkeleton::connect(Pool& p)
{
	if (address == 0)
	{
		LogLog::error(LogString(LOG4CXX_STR("No remote host is set for Appender named \"")) +
			name + LOG4CXX_STR("\"."));
	}
	else
	{
		cleanUp(p);

		try
		{
			SocketPtr socket(new Socket(address, port));
			setSocket(socket, p);
		}
		catch (SocketException& e)
		{
			LogString msg = LOG4CXX_STR("Could not connect to remote log4cxx server at [")
				+ address->getHostName() + LOG4CXX_STR("].");

			if (reconnectionDelay > 0)
			{
				msg += LOG4CXX_STR(" We will try again later. ");
			}

			fireConnector(); // fire the connector thread
			LogLog::error(msg, e);
		}
	}
}

void SocketAppenderSkeleton::setOption(const LogString& option, const LogString& value)
{
	if (StringHelper::equalsIgnoreCase(option, LOG4CXX_STR("REMOTEHOST"), LOG4CXX_STR("remotehost")))
	{
		setRemoteHost(value);
	}
	else if (StringHelper::equalsIgnoreCase(option, LOG4CXX_STR("PORT"), LOG4CXX_STR("port")))
	{
		setPort(OptionConverter::toInt(value, getDefaultPort()));
	}
	else if (StringHelper::equalsIgnoreCase(option, LOG4CXX_STR("LOCATIONINFO"), LOG4CXX_STR("locationinfo")))
	{
		setLocationInfo(OptionConverter::toBoolean(value, false));
	}
	else if (StringHelper::equalsIgnoreCase(option, LOG4CXX_STR("RECONNECTIONDELAY"), LOG4CXX_STR("reconnectiondelay")))
	{
		setReconnectionDelay(OptionConverter::toInt(value, getDefaultDelay()));
	}
	else
	{
		AppenderSkeleton::setOption(option, value);
	}
}

void SocketAppenderSkeleton::fireConnector()
{
	log4cxx::unique_lock<log4cxx::shared_mutex> lock(mutex);

    if ( !thread.joinable() )
	{
		LogLog::debug(LOG4CXX_STR("Connector thread not alive: starting monitor."));

		thread = log4cxx::thread( &SocketAppenderSkeleton::monitor, this );
	}
}

void SocketAppenderSkeleton::monitor()
{
	SocketPtr socket;
    bool isClosed = closed;

	while (!isClosed)
	{
		try
        {
            std::this_thread::sleep_for( std::chrono::milliseconds( reconnectionDelay ) );

			log4cxx::unique_lock<log4cxx::mutex> lock( interrupt_mutex );
            interrupt.wait_for( lock, std::chrono::milliseconds( reconnectionDelay ),
                                std::bind(&SocketAppenderSkeleton::is_closed, this) );

            if (!closed)
			{
				LogLog::debug(LogString(LOG4CXX_STR("Attempting connection to "))
                    + address->getHostName());
                socket = SocketPtr(new Socket(address, port));
				Pool p;
                setSocket(socket, p);
				LogLog::debug(LOG4CXX_STR("Connection established. Exiting connector thread."));
			}

            return;
		}
		catch (InterruptedException&)
		{
			LogLog::debug(LOG4CXX_STR("Connector interrupted.  Leaving loop."));
            return;
		}
		catch (ConnectException&)
		{
			LogLog::debug(LOG4CXX_STR("Remote host ")
                + address->getHostName()
				+ LOG4CXX_STR(" refused connection."));
		}
		catch (IOException& e)
		{
			LogString exmsg;
			log4cxx::helpers::Transcoder::decode(e.what(), exmsg);

			LogLog::debug(((LogString) LOG4CXX_STR("Could not connect to "))
                + address->getHostName()
				+ LOG4CXX_STR(". Exception is ")
				+ exmsg);
		}

        isClosed = closed;
	}

    LogLog::debug(LOG4CXX_STR("Exiting Connector.run() method."));
}

bool SocketAppenderSkeleton::is_closed(){
    return closed;
}