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/**
* @file llheartbeat.h
* @brief Class encapsulating logic for telling a watchdog that we live.
*
* $LicenseInfo:firstyear=2008&license=viewergpl$
*
* Copyright (c) 2008-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLHEARTBEAT_H
#define LL_LLHEARTBEAT_H
#include "linden_common.h"
#include "lltimer.h"
// Note: Win32 does not support the heartbeat/smackdown system;
// heartbeat-delivery turns into a no-op there.
class LLHeartbeat
{
public:
// secs_between_heartbeat: after a heartbeat is successfully delivered,
// we suppress sending more for this length of time.
// aggressive_heartbeat_panic_secs: if we've been failing to
// successfully deliver heartbeats for this length of time then
// we block for a while until we're really sure we got one delivered.
// aggressive_heartbeat_max_blocking_secs: this is the length of
// time we block for when we're aggressively ensuring that a 'panic'
// heartbeat was delivered.
LLHeartbeat(F32 secs_between_heartbeat = 5.0f,
F32 aggressive_heartbeat_panic_secs = 10.0f,
F32 aggressive_heartbeat_max_blocking_secs = 4.0f);
~LLHeartbeat();
bool send(F32 timeout_sec = 0.0f);
void setSuppressed(bool is_suppressed);
private:
int rawSend();
int rawSendWithTimeout(F32 timeout_sec);
F32 mSecsBetweenHeartbeat;
F32 mAggressiveHeartbeatPanicSecs;
F32 mAggressiveHeartbeatMaxBlockingSecs;
bool mSuppressed;
LLTimer mBeatTimer;
LLTimer mPanicTimer;
LLTimer mTimeoutTimer;
};
#endif // LL_HEARTBEAT_H
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