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<p>Новая страница: «== &#039;&#039;&#039;Description of the Situation&#039;&#039;&#039; == The SmartPlayer platform supports the operation of an important &#039;&#039;&#039;Watchdog&#039;&#039;&#039; mechanism designed to monitor the health of the client application. This mechanism ensures that the system, in this case the Windows-based client application, continues operating correctly and does not stop functioning. {{Note|&#039;&#039;&#039;This page describes both the original and the enhanced implementations of the Watchdog mechanism for Windows OS....»</p> <p><b>Новая страница</b></p><div>== &#039;&#039;&#039;Description of the Situation&#039;&#039;&#039; ==<br /> The SmartPlayer platform supports the operation of an important &#039;&#039;&#039;Watchdog&#039;&#039;&#039; mechanism designed to monitor the health of the client application. This mechanism ensures that the system, in this case the Windows-based client application, continues operating correctly and does not stop functioning.<br /> {{Note|&#039;&#039;&#039;This page describes both the original and the enhanced implementations of the Watchdog mechanism for Windows OS.&#039;&#039;&#039;|warn}}<br /> == &#039;&#039;&#039;What is Watchdog&#039;&#039;&#039; ==<br /> The &#039;&#039;&#039;Watchdog&#039;&#039;&#039; mechanism is designed to automatically monitor the health of the client application. It tracks the system&#039;s state and verifies that it continues to perform the required operations correctly. If the application stops responding, freezes, or fails to send a heartbeat signal, the Watchdog automatically performs a recovery action, such as restarting the SmartPlayer client application.<br /> == &#039;&#039;&#039;Original Watchdog Implementation in SmartPlayer&#039;&#039;&#039; ==<br /> The first implementation of the Watchdog for the Windows client application was a separate application that monitored whether the process had frozen. This application obtained information from the main application by periodically polling its process.&lt;br&gt;<br /> If the application responded to the request, it confirmed that it was functioning correctly and continued operating.&lt;br&gt;<br /> &#039;&#039;&#039;Polling interval&#039;&#039;&#039;: once every 3 seconds.&lt;br&gt;<br /> If no response was received from the client application, the Watchdog waited until the next polling cycle. A new request was sent 5 seconds after the failed attempt. If three consecutive attempts failed, the Watchdog restarted the SmartPlayer client application. As a result, the client application continued operating.<br /> {{Note|Even if the client application stops functioning, the Watchdog will still restart it after a certain period of time.|warn}}<br /> == &#039;&#039;&#039;Enhanced Watchdog Implementation in SmartPlayer&#039;&#039;&#039; ==<br /> The enhanced Watchdog implementation is designed to detect UI freezes in the SmartPlayer client application on Windows.<br /> Previously, the Watchdog monitored only the overall state of the application.&lt;br&gt;<br /> If the application continued running as a process, maintained its connection, and did not terminate unexpectedly, the mechanism considered it operational. However, in rare cases, the application itself could remain running while the QML-based user interface became unresponsive and stopped responding.&lt;br&gt;<br /> To handle this scenario, a separate parallel thread was added to the client application. This thread continuously monitors the state of the UI thread and determines whether the application&#039;s interface is responding. If the UI thread remains unresponsive for 30 seconds, the Watchdog detects the UI freeze and performs a graceful restart of the client application. This allows SmartPlayer to recover automatically without requiring user intervention.<br /> == &#039;&#039;&#039;Additional Information&#039;&#039;&#039; ==<br /> If this article does not help you use the functionality as intended or if you still have questions after reading it, you can ask them in the &#039;&#039;&#039;Discussions&#039;&#039;&#039; section at the top of the page.<br /> [[File:ОБсуждение_сторожевой_механизм.png|thumb|center| Example of the &#039;&#039;&#039;Discussions&#039;&#039;&#039; tab on a wiki page|800px]]<br /> Additional information is also available on the page [[Как взаимодействовать пользователю с разделом &quot;Обсуждения&quot;]].</div>

N.Bloshkin