Mercurial > projects > mde
annotate mde/scheduler/Init.d @ 43:1530d9c04d4d
Column/row resizing implemented for GridLayoutWidget (finally)!
Also new exitImmediately option and a few debug scope(failure) log messages.
committer: Diggory Hardy <diggory.hardy@gmail.com>
| author | Diggory Hardy <diggory.hardy@gmail.com> |
|---|---|
| date | Thu, 15 May 2008 10:39:57 +0100 |
| parents | 316b0230a849 |
| children | 0fd51d2c6c8a |
| rev | line source |
|---|---|
| 20 | 1 /* LICENSE BLOCK |
| 2 Part of mde: a Modular D game-oriented Engine | |
| 3 Copyright © 2007-2008 Diggory Hardy | |
| 4 | |
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5 This program is free software: you can redistribute it and/or modify it under the terms |
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6 of the GNU General Public License as published by the Free Software Foundation, either |
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7 version 2 of the License, or (at your option) any later version. |
| 20 | 8 |
| 9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; | |
| 10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 11 See the GNU General Public License for more details. | |
| 12 | |
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13 You should have received a copy of the GNU General Public License |
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | 15 |
| 16 /************************************************************************************************** | |
| 17 * Initialisation setup and exit cleanup module. | |
| 18 * | |
| 19 * This module provides an infrastructure for handling much of the initialisation and | |
| 20 * deinitialisation of the program. It does not, however, provide much of the (de)initialisation | |
| 21 * code; with the exception of that for the logger. | |
| 22 *************************************************************************************************/ | |
| 23 module mde.scheduler.Init; | |
| 24 | |
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25 import mde.scheduler.init2; // This module is responsible for setting up some init functions. |
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26 import mde.scheduler.initFunctions; |
| 20 | 27 import mde.scheduler.exception; |
| 28 | |
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29 import mde.Options; |
| 20 | 30 import paths = mde.resource.paths; |
| 31 import mde.exception; | |
| 32 | |
| 33 // tango imports | |
| 34 import tango.core.Thread; | |
| 35 import tango.core.Exception; | |
| 36 import tango.stdc.stringz : fromStringz; | |
| 37 import tango.util.log.Log : Log, Logger; | |
| 38 import tango.util.log.ConsoleAppender : ConsoleAppender; | |
| 39 | |
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40 //version = SwitchAppender; |
| 20 | 41 version (SwitchAppender) { // My own variation, currently just a test |
| 42 import tango.util.log.SwitchingFileAppender : SwitchingFileAppender; | |
| 43 } else { | |
| 44 import tango.util.log.RollingFileAppender : RollingFileAppender; | |
| 45 } | |
| 46 | |
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47 // Derelict imports |
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48 import derelict.opengl.gl; |
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49 import derelict.sdl.sdl; |
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50 import derelict.freetype.ft; |
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51 import derelict.util.exception; |
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52 |
| 20 | 53 /** |
| 54 * Static CTOR | |
| 55 * | |
| 56 * This should handle a minimal amount of functionality where useful. For instance, configuring the | |
| 57 * logger here and not in Init allows unittests to use the logger. | |
| 58 */ | |
| 59 static this() | |
| 60 { | |
| 61 // Find/create paths: | |
| 62 try { | |
| 63 paths.resolvePaths(); | |
| 64 } catch (Exception e) { | |
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65 // NOTE: an exception thrown here cannot be caught by main()! |
| 20 | 66 throw new InitException ("Resolving paths failed: " ~ e.msg); |
| 67 } | |
| 68 | |
| 69 // Set up the logger: | |
| 70 { | |
| 71 // Where logging is done to is determined at compile-time, currently just via static ifs. | |
| 72 Logger root = Log.getRootLogger(); | |
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73 |
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74 static if (true ) { // Log to files (first appender so root seperator messages don't show on console) |
| 20 | 75 version (SwitchAppender) { |
| 76 root.addAppender (new SwitchingFileAppender (paths.logDir~"/log-.txt", 5)); | |
| 77 } else { | |
| 78 // Use 2 log files with a maximum size of 1 MB: | |
| 79 root.addAppender (new RollingFileAppender (paths.logDir~"/log-.txt", 2, 1024*1024)); | |
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80 root.info (""); // some kind of separation between runs |
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81 root.info (""); |
| 20 | 82 } |
| 83 } | |
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84 static if (true ) { // Log to the console |
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85 root.addAppender(new ConsoleAppender); |
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86 } |
| 20 | 87 |
| 88 // Set the level here, but set it again once options have been loaded: | |
| 89 debug root.setLevel(root.Level.Trace); | |
| 90 else root.setLevel(root.Level.Info); | |
| 91 } | |
| 92 } | |
| 93 static ~this() | |
| 94 { | |
| 95 } | |
| 96 | |
| 97 /** | |
| 98 * Init class | |
| 99 * | |
| 100 * A scope class created at beginning of the program and destroyed at the end; thus the CTOR | |
| 101 * handles program initialisation and the DTOR handles program cleanup. | |
| 102 */ | |
| 103 scope class Init | |
| 104 { | |
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105 //private bool failure = false; // set true on failure during init, so that clean |
| 20 | 106 private static Logger logger; |
| 107 static this() { | |
| 108 logger = Log.getLogger ("mde.scheduler.Init.Init"); | |
| 109 } | |
| 110 | |
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111 /** this() − initialisation |
| 20 | 112 * |
| 113 * Runs general initialisation code, in a threaded manner where this isn't difficult. | |
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114 * If any init fails, cleanup is still handled by ~this(). |
| 20 | 115 * |
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116 * Init order: 1. Pre-init (loads components needed by most init functions). 2. Dynamic library |
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117 * loading (load any dynamic libraries first, so that if loading fails nothing else need be |
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118 * done). 3. Init functions (threaded functions handling the rest of initialisation). |
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119 */ |
| 20 | 120 /* In a single-threaded function this could be done with: |
| 121 * scope(failure) cleanup; | |
| 122 * This won't work with a threaded init function since any threads completing succesfully will | |
| 123 * not clean-up, and a fixed list of clean-up functions cannot be used since clean-up functions | |
| 124 * must not run where the initialisation functions have failed. | |
| 125 * Hence a list of clean-up functions is built similarly to scope(failure) --- see addCleanupFct. | |
| 126 */ | |
| 127 this() | |
| 128 { | |
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129 debug logger.trace ("Init: starting"); |
| 20 | 130 |
| 131 //BEGIN Pre-init (stage init0) | |
| 132 /* Load options now. Don't load in a thread since: | |
| 133 * Loading should be fast | |
| 134 * Most work is probably disk access | |
| 135 * It's a really good idea to let the options apply to all other loading. */ | |
| 136 try { | |
| 137 Options.load(); | |
| 138 } catch (optionsLoadException e) { | |
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139 throw new InitException ("Loading options failed: " ~ e.msg); |
| 20 | 140 } |
| 141 | |
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142 // Now re-set the logging level, using the value from the config file: |
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143 Log.getRootLogger.setLevel (cast(Log.Level) miscOpts.logLevel, true); |
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144 // And set this (debug option): |
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145 imde.run = !miscOpts.exitImmediately; |
| 20 | 146 //END Pre-init |
| 147 | |
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148 debug logger.trace ("Init: pre-init done"); |
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149 |
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150 //BEGIN Load dynamic libraries |
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151 /* Can be done by init functions but much neater to do here. |
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152 * Also means that init functions aren't run if a library fails to load. */ |
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153 try { |
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154 DerelictSDL.load(); |
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155 DerelictGL.load(); |
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156 DerelictFT.load(); |
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157 } catch (DerelictException de) { |
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158 logger.fatal ("Loading dynamic library failed:"); |
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159 logger.fatal (de.msg); |
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160 |
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161 throw new InitException ("Loading dynamic libraries failed (see above)."); |
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162 } |
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163 //END Load dynamic libraries |
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164 |
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165 debug logger.trace ("Init: dynamic libraries loaded"); |
| 20 | 166 |
| 167 //BEGIN Init (stages init2, init4) | |
| 168 /* Call init functions. | |
| 169 * | |
| 170 * Current method is to try using threads, and on failure assume no threads were actually | |
| 171 * created and run functions in a non-threaded manner. */ | |
| 172 | |
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173 try { |
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174 if (runStageThreaded (init)) runStageForward (init); |
| 20 | 175 } |
| 176 catch (InitStageException) { // This init stage failed. | |
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177 // FIXME: check DTOR still runs |
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178 throw new InitException ("An init function failed (see above message(s))"); |
| 20 | 179 } |
| 180 //END Init | |
| 181 | |
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182 debug logger.trace ("Init: done"); |
| 20 | 183 } |
| 184 | |
| 185 /** DTOR - runs cleanup functions. */ | |
| 186 ~this() | |
| 187 { | |
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188 debug logger.trace ("Cleanup: starting"); |
| 20 | 189 |
| 190 Options.save(); // save options... do so here for now | |
| 191 | |
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192 // General cleanup: |
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193 try { |
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194 if (runStageThreaded (cleanup)) runStageReverse (cleanup); |
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195 } |
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196 catch (InitStageException) { |
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197 // Nothing else to do but report: |
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198 logger.error ("One or more cleanup functions failed!"); |
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199 } |
| 20 | 200 |
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201 debug logger.trace ("Cleanup: done"); |
| 20 | 202 } |
| 203 | |
| 204 | |
| 205 //BEGIN runStage... | |
| 206 private static { | |
| 207 /* The following three functions, runStage*, each run all functions in a stage in some order, | |
| 208 * catching any exceptions thrown by the functions (although this isn't guaranteed for threads), | |
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209 * and throw an InitStageException on initFailure. */ |
| 20 | 210 |
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211 const LOG_IF_MSG = "Init function "; |
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212 const LOG_CF_MSG = "Cleanup function "; |
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213 const LOG_F_START = " - running"; |
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214 const LOG_F_END = " - completed"; |
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215 const LOG_F_FAIL = " - failed: "; |
| 20 | 216 /* Runs all functions consecutively, first-to-last. |
| 217 * If any function fails, halts immediately. */ | |
| 218 void runStageForward (InitStage s) { | |
| 219 foreach (func; s.funcs) { | |
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220 if (initFailure) break; |
| 20 | 221 try { |
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222 debug logger.trace (LOG_IF_MSG ~ func.name ~ LOG_F_START); |
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223 func.func(); |
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224 debug logger.trace (LOG_IF_MSG ~ func.name ~ LOG_F_END); |
| 20 | 225 } catch (Exception e) { |
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226 logger.fatal (LOG_IF_MSG ~ func.name ~ LOG_F_FAIL ~ |
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227 ((e.msg is null || e.msg == "") ? "(no failure message)" : e.msg) ); |
| 20 | 228 |
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229 setInitFailure(); |
| 20 | 230 } |
| 231 } | |
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232 |
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233 if (initFailure) throw new InitStageException; // Problem running; abort and cleanup from here. |
| 20 | 234 } |
| 235 /* Runs all functions consecutively, last-to-first. | |
| 236 * If any function fails, continue until all have been run. */ | |
| 237 void runStageReverse (InitStage s) { | |
| 238 foreach_reverse (func; s.funcs) { | |
| 239 try { | |
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240 debug logger.trace (LOG_CF_MSG ~ func.name ~ LOG_F_START); |
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241 func.func(); |
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242 debug logger.trace (LOG_CF_MSG ~ func.name ~ LOG_F_END); |
| 20 | 243 } catch (Exception e) { |
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244 logger.fatal (LOG_CF_MSG ~ func.name ~ LOG_F_FAIL ~ |
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245 ((e.msg is null || e.msg == "") ? "(no failure message)" : e.msg) ); |
| 20 | 246 |
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247 setInitFailure(); |
| 20 | 248 } |
| 249 } | |
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250 if (initFailure) throw new InitStageException; // Problem running; abort and cleanup from here. |
| 20 | 251 } |
| 252 /* Tries running functions in a threaded way. Returns false if successful, true if not but | |
| 253 * functions should be run without threads. */ | |
| 254 bool runStageThreaded (InitStage s) { | |
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255 if (!miscOpts.useThreads) return true; // Use unthreaded route instead |
| 20 | 256 |
| 257 ThreadGroup tg; | |
| 258 try { // creating/starting threads could fail | |
| 259 tg = new ThreadGroup; | |
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260 foreach (func; s.funcs) { // Start all threads |
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261 debug logger.trace (LOG_IF_MSG ~ func.name ~ LOG_F_START); |
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262 tg.create(func.func); |
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263 debug logger.trace (LOG_IF_MSG ~ func.name ~ LOG_F_END); |
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264 } |
| 20 | 265 } catch (ThreadException e) { // Problem with threading; try without threads |
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266 logger.error ("Caught ThreadException while trying to create threads:"); |
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267 logger.error (e.msg); |
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268 logger.info ("Will disable threads and continue, assuming no threads were created."); |
| 20 | 269 |
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270 Options.setBool("misc", "useThreads", false); // Disable threads entirely |
| 20 | 271 return true; // Try again without threads |
| 272 } | |
| 273 | |
| 274 /* Wait for all threads to complete. | |
| 275 * | |
| 276 * If something went wrong, we still need to do this before cleaning up. | |
| 277 */ | |
| 278 foreach (t; tg) { | |
| 279 try { | |
| 280 t.join (true); | |
| 281 } catch (Exception e) { | |
| 282 // Relying on catching exceptions thrown by other threads is a bad idea. | |
| 283 // Hence all threads should catch their own exceptions and return safely. | |
| 284 | |
| 285 logger.fatal ("Unhandled exception from Init function:"); | |
| 286 logger.fatal (e.msg); | |
| 287 | |
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288 setInitFailure (); // abort (but join other threads first) |
| 20 | 289 } |
| 290 } | |
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291 |
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292 if (initFailure) throw new InitStageException; // Problem running; abort and cleanup from here. |
| 20 | 293 return false; // Done successfully |
| 294 } | |
| 295 } | |
| 296 //END runStage... | |
| 297 | |
| 298 debug (mdeUnitTest) unittest { | |
| 299 /* Fake init and cleanup. Use unittest-specific init and cleanup InitStages to avoid | |
| 300 * messing other init/cleanup up. */ | |
| 301 static InitStage initUT, cleanupUT; | |
| 302 | |
| 303 static bool initialised = false; | |
| 304 static void cleanupFunc1 () { | |
| 305 initialised = false; | |
| 306 } | |
| 307 static void cleanupFunc2 () { | |
| 308 assert (initialised == true); | |
| 309 } | |
| 310 | |
| 311 static void initFunc () { | |
| 312 initialised = true; | |
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313 cleanupUT.addFunc (&cleanupFunc1, "UT cleanup 1"); |
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314 cleanupUT.addFunc (&cleanupFunc2, "UT cleanup 2"); |
| 20 | 315 } |
| 316 | |
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317 initUT.addFunc (&initFunc, "UT init"); |
| 20 | 318 |
| 319 runStageForward (initUT); | |
| 320 assert (initialised); | |
| 321 | |
| 322 runStageReverse (cleanupUT); | |
| 323 assert (!initialised); | |
| 324 | |
| 325 logger.info ("Unittest complete."); | |
| 326 } | |
| 327 } |