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| # | Location | File | Last Modified |
|---|---|---|---|
| 1 | IV-eHMP_CIF.zip\IMAG_Source\VISA\Java\ImagingCache\main\src\java\gov\va\med\imaging\storage\cache\impl\eviction | LastAccessedEvictionStrategy.java | Mon Dec 4 21:35:30 2017 UTC |
| 2 | IV-eHMP_CIF.zip\IMAG_Source\VISA\Java\ImagingCache\main\src\java\gov\va\med\imaging\storage\cache\impl\eviction | LastAccessedEvictionStrategy.java | Mon Dec 4 22:01:25 2017 UTC |
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| 1 | package go v.va.med.i maging.sto rage.cache .impl.evic tion; | |
| 2 | ||
| 3 | import gov .va.med.im aging.stor age.cache. *; | |
| 4 | import gov .va.med.im aging.stor age.cache. exceptions .CacheExce ption; | |
| 5 | ||
| 6 | import jav a.text.Dat eFormat; | |
| 7 | import jav a.text.Sim pleDateFor mat; | |
| 8 | import jav a.util.*; | |
| 9 | import jav a.util.con current.Ca llable; | |
| 10 | import jav a.util.con current.Ex ecutionExc eption; | |
| 11 | import jav a.util.con current.Fu ture; | |
| 12 | ||
| 13 | import org .apache.lo gging.log4 j.LogManag er; | |
| 14 | import org .apache.lo gging.log4 j.Logger; | |
| 15 | ||
| 16 | /** | |
| 17 | * | |
| 18 | * @author
|
|
| 19 | * | |
| 20 | */ | |
| 21 | public cla ss LastAcc essedEvict ionStrateg y | |
| 22 | extends Pe riodicSwee pEvictionS trategy | |
| 23 | implements EvictionS trategy, L astAccesse dEvictionS trategyMBe an | |
| 24 | { | |
| 25 | pu blic final static St ring maxTi meProperty Key = "max imumAge"; | |
| 26 | pu blic final static St ring initi alizedProp ertyKey = "initializ ed"; | |
| 27 | ||
| 28 | pr ivate fina l long max imumTimeSi nceLastAcc ess; | |
| 29 | pr ivate fina l DateForm at df = ne w SimpleDa teFormat(" dd-MMM-yyy y hh:mm:ss "); | |
| 30 | pr ivate fina l Logger l og = LogMa nager.getL ogger(this .getClass( )); | |
| 31 | pr ivate Swee pStatistic s lastSwee pStatistic s = new Sw eepStatist ics(System .currentTi meMillis() , 0); | |
| 32 | ||
| 33 | /* * | |
| 34 | * Factory m ethod used by the in teractive tool. | |
| 35 | * | |
| 36 | * @param me mento | |
| 37 | * @param ti mer | |
| 38 | * @return | |
| 39 | * / | |
| 40 | st atic LastA ccessedEvi ctionStrat egy create (Propertie s prop, Ev ictionTime r timer) | |
| 41 | { | |
| 42 | Stri ng name = (String)pr op.get(Sim pleEvictio nStrategy. nameProper tyKey); | |
| 43 | long maxTimeSi nceLastAcc ess = ((Lo ng)prop.ge t(maxTimeP ropertyKey )).longVal ue(); | |
| 44 | bool ean initia lized = (( Boolean)pr op.get(ini tializedPr opertyKey) ).booleanV alue(); | |
| 45 | ||
| 46 | retu rn new Las tAccessedE victionStr ategy(name , maxTimeS inceLastAc cess, init ialized, t imer); | |
| 47 | } | |
| 48 | ||
| 49 | st atic LastA ccessedEvi ctionStrat egy create (LastAcces sedEvictio nStrategyM emento mem ento, Evic tionTimer timer) | |
| 50 | { | |
| 51 | retu rn new Las tAccessedE victionStr ategy(meme nto.getNam e(), memen to.getMaxi mumTimeSin ceLastAcce ss(), meme nto.isInit ialized(), timer); | |
| 52 | } | |
| 53 | ||
| 54 | st atic LastA ccessedEvi ctionStrat egy create (String na me, Long m aximumTime SinceLastA ccess, boo lean initi alized, Ev ictionTime r timer) | |
| 55 | { | |
| 56 | retu rn new Las tAccessedE victionStr ategy(name , maximumT imeSinceLa stAccess, initialize d, timer); | |
| 57 | } | |
| 58 | ||
| 59 | pr otected La stAccessed EvictionSt rategy(Str ing name, Long maxim umTimeSinc eLastAcces s, boolean initializ ed, Evicti onTimer ti mer) | |
| 60 | { | |
| 61 | supe r(name, ti mer); | |
| 62 | this .maximumTi meSinceLas tAccess = maximumTim eSinceLast Access.lon gValue(); | |
| 63 | } | |
| 64 | ||
| 65 | /* * | |
| 66 | * Get the m aximum age of a grou p as measu red from n ow to its last acces s. | |
| 67 | * | |
| 68 | * @see gov. va.med.ima ging.stora ge.cache.i mpl.evicti on.LastAcc essedEvict ionStrateg yMBean#get MaximumTim eSinceLast Access() | |
| 69 | * / | |
| 70 | @O verride | |
| 71 | pu blic long getMaximum Age() | |
| 72 | { | |
| 73 | retu rn maximum TimeSinceL astAccess; | |
| 74 | } | |
| 75 | ||
| 76 | ||
| 77 | /* (non-Java doc) | |
| 78 | * @see gov. va.med.ima ging.stora ge.cache.i mpl.evicti on.LastAcc essedEvict ionStrateg yMBean#get EvictedLas tSweep() | |
| 79 | * / | |
| 80 | pu blic int g etEvictedL astSweep() | |
| 81 | { | |
| 82 | retu rn getLast SweepStati stics().ge tTotalEvic tedGroups( ); | |
| 83 | } | |
| 84 | ||
| 85 | /* (non-Java doc) | |
| 86 | * @see gov. va.med.ima ging.stora ge.cache.i mpl.evicti on.LastAcc essedEvict ionStrateg yMBean#get LastRunDat e() | |
| 87 | * / | |
| 88 | pu blic Strin g getLastR unDate() | |
| 89 | { | |
| 90 | retu rn df.form at( new Da te(getLast SweepStati stics().ge tSweepTime ()) ); | |
| 91 | } | |
| 92 | ||
| 93 | ||
| 94 | /* * | |
| 95 | * Create a Memento th at may be serialized and later used to r estore the state of this class . | |
| 96 | * | |
| 97 | * @return | |
| 98 | * / | |
| 99 | @O verride | |
| 100 | pu blic LastA ccessedEvi ctionStrat egyMemento createMem ento() | |
| 101 | { | |
| 102 | retu rn new Las tAccessedE victionStr ategyMemen to(getName (), isInit ialized(), getMaximu mAge()); | |
| 103 | } | |
| 104 | ||
| 105 | // ========= ========== ========== ========== ========== ========== ========== ========== ========== ========== ======= | |
| 106 | // | |
| 107 | // ========= ========== ========== ========== ========== ========== ========== ========== ========== ========== ======= | |
| 108 | ||
| 109 | @O verride | |
| 110 | pu blic Sweep Statistics getLastSw eepStatist ics() | |
| 111 | { | |
| 112 | retu rn lastSwe epStatisti cs; | |
| 113 | } | |
| 114 | ||
| 115 | vo id setLast SweepStati stics(Swee pStatistic s sweepSta tistics) | |
| 116 | { | |
| 117 | this .lastSweep Statistics = sweepSt atistics; | |
| 118 | } | |
| 119 | ||
| 120 | @O verride | |
| 121 | pu blic void sweep() | |
| 122 | { | |
| 123 | log. info("Evic tion sweep commencin g, startin g worker t asks."); | |
| 124 | ||
| 125 | long maxAge = getMaximum Age(); // t he max per iod of a c ached item before it gets dele ted | |
| 126 | // this me thod is ov erriden in derived c lasses and should be called on ly | |
| 127 | // once pe r sweep | |
| 128 | Date now = new Date(); // t he current date/time | |
| 129 | Date minLastAc cess = new Date(now. getTime() - maxAge); // anythin g accessed before th is time sh ould be de leted. | |
| 130 | Last AccessedDa teJudge ju dge = new LastAccess edDateJudg e(minLastA ccess); | |
| 131 | ||
| 132 | List <Future<Sw eepStatist ics>> futu res = new ArrayList< Future<Swe epStatisti cs>>(); | |
| 133 | for( Region reg ion: getRe gions()) | |
| 134 | { | |
| 135 | future s.add( get Executor() .submit( n ew LastAcc essedEvict ionTask(ju dge, regio n) ) ); | |
| 136 | } | |
| 137 | ||
| 138 | getE xecutor(). execute(ne w Statisti csCollecti onTask(fut ures)); | |
| 139 | ||
| 140 | log. info("Evic tion sweep commencin g, worker tasks star ted."); | |
| 141 | } | |
| 142 | ||
| 143 | // ========= ========== ========== ========== ========== ========== ========== ========== ========== ========== ======= | |
| 144 | // | |
| 145 | // ========= ========== ========== ========== ========== ========== ========== ========== ========== ========== ======= | |
| 146 | ||
| 147 | /* * | |
| 148 | * This is t he class t hat actual ly does th e work of deleting ( evicting) | |
| 149 | * files fro m the cach e. | |
| 150 | * | |
| 151 | * @author
|
|
| 152 | * | |
| 153 | * / | |
| 154 | cl ass LastAc cessedEvic tionTask | |
| 155 | im plements C allable<Sw eepStatist ics> | |
| 156 | { | |
| 157 | priv ate final Region reg ion; | |
| 158 | priv ate final EvictionJu dge<Group> judge; | |
| 159 | ||
| 160 | /** | |
| 161 | * S tarting wi th the spe cified reg ion, delet e anything older (i. e. last ac cess befor e the minL astAccess) | |
| 162 | * @ param regi on | |
| 163 | * @ param minL astAccess | |
| 164 | */ | |
| 165 | Last AccessedEv ictionTask (EvictionJ udge<Group > judge, R egion regi on) | |
| 166 | { | |
| 167 | this.j udge = jud ge; | |
| 168 | this.r egion = re gion; | |
| 169 | } | |
| 170 | ||
| 171 | Evic tionJudge< Group> get Judge() | |
| 172 | { | |
| 173 | return this.judg e; | |
| 174 | } | |
| 175 | ||
| 176 | Regi on getRegi on() | |
| 177 | { | |
| 178 | return this.regi on; | |
| 179 | } | |
| 180 | ||
| 181 | ||
| 182 | /* ( non-Javado c) | |
| 183 | * @ see java.u til.concur rent.Calla ble#call() | |
| 184 | */ | |
| 185 | publ ic SweepSt atistics c all() | |
| 186 | thro ws Excepti on | |
| 187 | { | |
| 188 | int ev icted = 0; | |
| 189 | long s tart = Sys tem.curren tTimeMilli s(); | |
| 190 | log.in fo(Thread. currentThr ead().getN ame() + " beginning eviction s weep of re gion '" + getRegion( ).getName( ) + "'."); | |
| 191 | ||
| 192 | try | |
| 193 | { | |
| 194 | evicted = region.e valuateAnd EvictChild Groups(get Judge()); | |
| 195 | } | |
| 196 | catch (CacheExce ption e) | |
| 197 | { | |
| 198 | e.printS tackTrace( ); | |
| 199 | } | |
| 200 | ||
| 201 | log.in fo(Thread. currentThr ead().getN ame() + " completed sweep, " + evicted + " groups evicted.") ; | |
| 202 | ||
| 203 | return new Sweep Statistics (start, ev icted); | |
| 204 | } | |
| 205 | } | |
| 206 | ||
| 207 | /* * | |
| 208 | * A class t hat waits for result s from the region sw eep tasks and then c ollects th e statisti cs. | |
| 209 | * | |
| 210 | * @author
|
|
| 211 | * / | |
| 212 | cl ass Statis ticsCollec tionTask | |
| 213 | im plements R unnable | |
| 214 | { | |
| 215 | priv ate List<F uture<Swee pStatistic s>> future s; | |
| 216 | Stat isticsColl ectionTask (List<Futu re<SweepSt atistics>> futures) | |
| 217 | { | |
| 218 | this.f utures = f utures; | |
| 219 | } | |
| 220 | ||
| 221 | priv ate List<F uture<Swee pStatistic s>> getFut ures() | |
| 222 | { | |
| 223 | return futures; | |
| 224 | } | |
| 225 | ||
| 226 | /* ( non-Javado c) | |
| 227 | * @ see java.l ang.Runnab le#run() | |
| 228 | */ | |
| 229 | publ ic void ru n() | |
| 230 | { | |
| 231 | SweepS tatistics sweepStati stics = ne w SweepSta tistics(); | |
| 232 | ||
| 233 | for( F uture<Swee pStatistic s> future : getFutur es() ) | |
| 234 | { | |
| 235 | try | |
| 236 | { | |
| 237 | sweepStati stics.add( future.ge t() ); | |
| 238 | } | |
| 239 | catch (I nterrupted Exception x) | |
| 240 | { | |
| 241 | log.error( "Error get ting resul ts of regi on sweep, eviction s tatistics may not be accurate" , x); | |
| 242 | } | |
| 243 | catch (E xecutionEx ception x) | |
| 244 | { | |
| 245 | log.error( "Error get ting resul ts of regi on sweep, eviction s tatistics may not be accurate" , x); | |
| 246 | ||
| 247 | } | |
| 248 | } | |
| 249 | ||
| 250 | setLas tSweepStat istics(swe epStatisti cs); | |
| 251 | } | |
| 252 | } | |
| 253 | ||
| 254 | /* * | |
| 255 | * A simple EvictionJu dge that j ust looks at the las t accessed date | |
| 256 | * @author v haiswbecke c | |
| 257 | * | |
| 258 | * / | |
| 259 | cl ass LastAc cessedDate Judge | |
| 260 | im plements E victionJud ge<Group> | |
| 261 | { | |
| 262 | fina l long min LastAccess Milli; | |
| 263 | ||
| 264 | Last AccessedDa teJudge(Da te minLast Access) | |
| 265 | { | |
| 266 | minLas tAccessMil li = minLa stAccess.g etTime(); | |
| 267 | } | |
| 268 | ||
| 269 | publ ic boolean isEvictab le(Group g roup) | |
| 270 | thro ws CacheEx ception | |
| 271 | { | |
| 272 | Date g roupLastAc cessed = g roup == nu ll ? null : group.ge tLastAcces sed(); | |
| 273 | return groupLast Accessed = = null ? f alse : (gr oupLastAcc essed.getT ime() < mi nLastAcces sMilli); | |
| 274 | } | |
| 275 | ||
| 276 | } | |
| 277 | } |
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