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annotate Platforms/Generic/DelayedCallCommand.cpp @ 431:26b90b110719 am-vsol-upgrade

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added DelayedCallExecutor to avoid using sleep() in C++ that consumes 100% CPU once executed in WASM
author am@osimis.io
date Thu, 29 Nov 2018 19:25:15 +0100
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children 2a8ac2d426db
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431
26b90b110719 added DelayedCallExecutor to avoid using sleep() in C++ that consumes 100% CPU once executed in WASM
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "DelayedCallCommand.h"
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23 #include "boost/thread/thread.hpp"
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24
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25 #include <iostream>
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26
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27 namespace OrthancStone
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28 {
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29 DelayedCallCommand::DelayedCallCommand(MessageBroker& broker,
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30 MessageHandler<IDelayedCallExecutor::TimeoutMessage>* callback, // takes ownership
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31 unsigned int timeoutInMs,
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32 Orthanc::IDynamicObject* payload /* takes ownership */,
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33 NativeStoneApplicationContext& context
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34 ) :
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35 IObservable(broker),
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36 callback_(callback),
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37 payload_(payload),
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38 context_(context),
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39 expirationTimePoint_(boost::chrono::system_clock::now() + boost::chrono::milliseconds(timeoutInMs)),
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40 timeoutInMs_(timeoutInMs)
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41 {
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42 }
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43
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44
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45 void DelayedCallCommand::Execute()
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46 {
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47 while (boost::chrono::system_clock::now() < expirationTimePoint_)
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48 {
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49 boost::this_thread::sleep_for(boost::chrono::milliseconds(1));
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50 }
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51 }
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52
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53 void DelayedCallCommand::Commit()
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54 {
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55 // We want to make sure that, i.e, the UpdateThread is not
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56 // triggered while we are updating the "model" with the result of
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57 // an OracleCommand
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58 NativeStoneApplicationContext::GlobalMutexLocker lock(context_);
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59
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60 if (callback_.get() != NULL)
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61 {
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62 IDelayedCallExecutor::TimeoutMessage message; // TODO: add payload
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63 callback_->Apply(message);
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64 }
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65 }
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66 }