barrier/src/lib/ipc/CIpcLogOutputter.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012 Nick Bolton
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file COPYING that should have accompanied this file.
 * 
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "CIpcLogOutputter.h"
#include "CIpcServer.h"
#include "CIpcMessage.h"
#include "Ipc.h"
#include "CEvent.h"
#include "CEventQueue.h"
#include "TMethodEventJob.h"
#include "CIpcClientProxy.h"
#include "CArch.h"
#include "CThread.h"
#include "TMethodJob.h"

CIpcLogOutputter::CIpcLogOutputter(CIpcServer& ipcServer) :
m_ipcServer(ipcServer),
m_bufferMutex(ARCH->newMutex()),
m_sending(false),
m_running(true)
{
	m_bufferThread = new CThread(new TMethodJob<CIpcLogOutputter>(
		this, &CIpcLogOutputter::bufferThread));
}

CIpcLogOutputter::~CIpcLogOutputter()
{
	ARCH->closeMutex(m_bufferMutex);
	delete m_bufferThread;
}

void
CIpcLogOutputter::open(const char* title)
{
}

void
CIpcLogOutputter::close()
{
	m_running = false;
	m_bufferThread->wait(5);
}

void
CIpcLogOutputter::show(bool showIfEmpty)
{
}

bool
CIpcLogOutputter::write(ELevel, const char* text)
{
	// sending the buffer generates log messages, which we must throw
	// away (otherwise this would cause recursion). this is just a drawback
	// of logging this way. there is also the risk that this could throw
	// away log messages not generated by the ipc, but it seems like it
	// would be difficult to distinguish (other than looking at the stack
	// trace somehow). perhaps a file stream might be a better option :-/
	if (m_sending) {
		return true;
	}

	CArchMutexLock lock(m_bufferMutex);
	m_buffer.append(text);
	m_buffer.append("\n");
	return true;
}

void
CIpcLogOutputter::bufferThread(void*)
{
	while (m_running) {
		while (m_running && m_buffer.size() == 0) {
			ARCH->sleep(.1);
		}

		if (!m_running) {
			break;
		}

		if (m_ipcServer.hasClients(kIpcClientGui)) {
			sendBuffer();
		}
	}
}

CString*
CIpcLogOutputter::emptyBuffer()
{
	CArchMutexLock lock(m_bufferMutex);
	CString* copy = new CString(m_buffer);
	m_buffer.clear();
	return copy;
}

void
CIpcLogOutputter::sendBuffer()
{
	CIpcMessage message;
	message.m_type = kIpcLogLine;
	message.m_data = emptyBuffer();

	m_sending = true;
	m_ipcServer.send(message, kIpcClientGui);
	m_sending = false;
}