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/**
* @file llheartbeat.h
* @brief Class encapsulating logic for telling a watchdog that we live.
*
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#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 LL_COMMON_API 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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