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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ |
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2 /* This Source Code Form is subject to the terms of the Mozilla Public |
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this |
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
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5 |
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6 #include "nsISupports.idl" |
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7 |
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8 interface nsIVisualEventTracerLog; |
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9 |
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10 /** |
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11 * Interface to control the visual event tracer feature. The result |
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12 * is a log of various events that are monitored by a custom code |
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13 * instrumentation around the mozilla code base. |
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14 */ |
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15 |
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16 [builtinclass, scriptable, uuid(713ee3ca-95e0-4085-8616-f6d64a9508ad)] |
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17 interface nsIVisualEventTracer : nsISupports |
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18 { |
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19 /** |
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20 * Start the logging now. No affect if already started. |
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21 * Current backlog is deleted by this call otherwise. |
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22 * |
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23 * @param minBacklogSeconds |
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24 * Manimum time to keep the backlog. Entries of the log are discarded |
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25 * when their age is more then value of this argument. |
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26 */ |
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27 void start(in unsigned long minBacklogSeconds); |
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28 |
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29 /** |
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30 * Stop the logging now. Backlog is kept in memory. |
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31 */ |
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32 void stop(); |
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33 |
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34 /** |
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35 * Obtain the log. This can be called whenever you want. |
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36 * |
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37 * @return |
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38 * Result is an object that keeps snaphot of the log from |
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39 * time this method has been called. You can then access |
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40 * the log using the object. Calling stop() on the tracer |
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41 * doesn't delete this log. |
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42 */ |
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43 nsIVisualEventTracerLog snapshot(); |
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44 }; |
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45 |
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46 [builtinclass, scriptable, uuid(8ec6e36d-6cba-400b-bcd6-454679f5f75a)] |
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47 interface nsIVisualEventTracerLog : nsISupports |
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48 { |
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49 /** |
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50 * JSON string of the log. Use JSON.parse to get it as an object. |
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51 */ |
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52 readonly attribute ACString JSONString; |
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53 |
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54 /** |
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55 * Write the JSON string returned by JSONString to the log defined by |
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56 * the environment variable MOZ_PROFILING_FILE. |
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57 */ |
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58 void writeToProfilingFile(); |
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59 }; |