Hi, This is cache implementation, it will not work if key has strong referense on value (or have bugs). There is a very simple test in MemoryStore main method. I send a correct implementation for SoftReferenceMap in commons collections a month ago, but it was forgot. It is possible to implement cache with Map interface and memory store can wrap this map (it will be more useful). Is it interesting for anybody ?
output from test : operations ... 1 removed from queue, size7 2 removed from queue, size15 3 removed from queue, size14 4 removed from queue, size13 5 removed from queue, size12 6 removed from queue, size11 7 removed from queue, size10 8 removed from queue, size9 9 removed from queue, size8 10 removed from queue, size7 11 removed from queue, size15 12 removed from queue, size14 13 removed from queue, size13 14 removed from queue, size12 15 removed from queue, size11 16 removed from queue, size10 17 removed from queue, size9 18 removed from queue, size8 19 removed from queue, size7 23 removed from queue, size15 24 removed from queue, size14 25 removed from queue, size13 26 removed from queue, size12 27 removed from queue, size11 28 removed from queue, size10 20 removed from queue, size9 21 removed from queue, size8 22 removed from queue, size7 29 removed from queue, size15 30 removed from queue, size14 31 removed from queue, size13 32 removed from queue, size12 33 removed from queue, size11 34 removed from queue, size10 35 removed from queue, size9 36 removed from queue, size8 37 removed from queue, size7 46 removed from queue, size15 38 removed from queue, size14 39 removed from queue, size13 40 removed from queue, size12 41 removed from queue, size11 42 removed from queue, size10 43 removed from queue, size9 44 removed from queue, size8 45 removed from queue, size7 47 removed from queue, size15 48 removed from queue, size14 49 removed from queue, size13 50 removed from queue, size12 51 removed from queue, size11 52 removed from queue, size10 53 removed from queue, size9 54 removed from queue, size8 55 removed from queue, size7 56 removed from queue, size15 57 removed from queue, size14 58 removed from queue, size13 59 removed from queue, size12 60 removed from queue, size11 61 removed from queue, size10 62 removed from queue, size9 63 removed from queue, size8 64 removed from queue, size7 69 removed from queue, size15 70 removed from queue, size14 71 removed from queue, size13 72 removed from queue, size12 73 removed from queue, size11 65 removed from queue, size10 66 removed from queue, size9 67 removed from queue, size8 68 removed from queue, size7 74 removed from queue, size15 75 removed from queue, size14 76 removed from queue, size13 77 removed from queue, size12 78 removed from queue, size11 79 removed from queue, size10 80 removed from queue, size9 81 removed from queue, size8 82 removed from queue, size7 83 removed from queue, size15 84 removed from queue, size14 85 removed from queue, size13 86 removed from queue, size12 87 removed from queue, size11 88 removed from queue, size10 89 removed from queue, size9 90 removed from queue, size8 91 removed from queue, size7 92 removed from queue, size15 93 removed from queue, size14 94 removed from queue, size13 95 removed from queue, size12 96 removed from queue, size11 97 removed from queue, size10 98 removed from queue, size9 99 removed from queue, size8 100 removed from queue, size7 101 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queue, size10 134 removed from queue, size9 135 removed from queue, size8 136 removed from queue, size7 138 removed from queue, size15 139 removed from queue, size14 140 removed from queue, size13 141 removed from queue, size12 142 removed from queue, size11 143 removed from queue, size10 144 removed from queue, size9 145 removed from queue, size8 137 removed from queue, size7 146 removed from queue, size15 147 removed from queue, size14 148 removed from queue, size13 149 removed from queue, size12 150 removed from queue, size11 151 removed from queue, size10 152 removed from queue, size9 153 removed from queue, size8 154 removed from queue, size7 161 removed from queue, size15 162 removed from queue, size14 163 removed from queue, size13 155 removed from queue, size12 156 removed from queue, size11 157 removed from queue, size10 158 removed from queue, size9 159 removed from queue, size8 160 removed from queue, size7 164 removed from queue, size15 165 removed from queue, size14 166 removed from queue, size13 167 removed from queue, size12 168 removed from queue, size11 169 removed from queue, size10 170 removed from queue, size9 171 removed from queue, size8 172 removed from queue, size7 173 removed from queue, size15 174 removed from queue, size14 175 removed from queue, size13 176 removed from queue, size12 177 removed from queue, size11 178 removed from queue, size10 179 removed from queue, size9 180 removed from queue, size8 181 removed from queue, size7 184 removed from queue, size15 185 removed from queue, size14 186 removed from queue, size13 187 removed from queue, size12 188 removed from queue, size11 189 removed from queue, size10 190 removed from queue, size9 182 removed from queue, size8 183 removed from queue, size7 191 removed from queue, size15 192 removed from queue, size14 193 removed from queue, size13 194 removed from queue, size12 195 removed from queue, size11 196 removed from queue, size10 197 removed from queue, size9 198 removed from queue, size8 199 removed from queue, size7 207 removed from queue, size15 208 removed from queue, size14 200 removed from queue, size13 201 removed from queue, size12 202 removed from queue, size11 203 removed from queue, size10 204 removed from queue, size9 205 removed from queue, size8 206 removed from queue, size7 209 removed from queue, size15 210 removed from queue, size14 211 removed from queue, size13 212 removed from queue, size12 213 removed from queue, size11 214 removed from queue, size10 215 removed from queue, size9 216 removed from queue, size8 217 removed from queue, size7 218 removed from queue, size15 219 removed from queue, size14 220 removed from queue, size13 221 removed from queue, size12 222 removed from queue, size11 223 removed from queue, size10 224 removed from queue, size9 225 removed from queue, size8 226 removed from queue, size7 230 removed from queue, size15 231 removed from queue, size14 232 removed from queue, size13 233 removed from queue, size12 234 removed from queue, size11 235 removed from queue, size10 227 removed from queue, size9 228 removed from queue, size8 229 removed from queue, size7 236 removed from queue, size15 237 removed from queue, size14 238 removed from queue, size13 239 removed from queue, size12 240 removed from queue, size11 241 removed from queue, size10 242 removed from queue, size9 243 removed from queue, size8 244 removed from queue, size7 iterating cache ... 252 251 250 249 248 247 246 245 254 253 0 At 07:40 PM 1/14/2002 +0100, you wrote: >Juozas > > >-----Original Message----- > >From: Juozas Baliuka [mailto:[EMAIL PROTECTED]] > >Sent: Monday, January 14, 2002 8:20 PM > >To: Jakarta Commons Developers List > >Subject: RE: [simplestore] inital check in > > > > > >Hi, > >I read documentation tested all Reference types today. > >The problem exists, object is cleared before reference is queued. > >There is no way to flush expired object to stable storage if it has no > >strong references, > >but you can solve it this way : > >WRITE: > >0. Test queue, clear pooled references. > >1. write object . > >2. Add internal strong and Weak reference, make it a "new". > >3. Put weak reference to cache. > >4. release strong internal references from "old" objects. > >READ: > >0. Test queue, clear pooled references. > >1. Search in Cashe. > >2. Load object, if not found. > >3. Add internal strong and Weak references, make object a "new". > >4. Put weak reference to Cashe. > >5. Release strong internal references from "old" objects. > >6. return object. > > > >No need for "background cleanup". > >I can implement this kind of cache, if it interesting for some body. > >I have some my cache implementations, but they are not very "common" :) > >Kool, mate. How about a MRU based Memory Store which is implemented with >week reference. We can call it SoftMRUMemoryStore or something else. Just >send compilable code and I will check it in for you. Keep sending patches, >it's valuable ;-). > >Stand by for patches > > Gerhard > > >At 05:28 PM 1/14/2002 +0100, you wrote: > >>Juozas, > >> > >> >From: Juozas Baliuka [mailto:[EMAIL PROTECTED]] > >> > > >> >> > >> >>StoreJanitorImpl: you can register your Memory Stores in > >> >>this class. A background Thread checks if memory running > >> >>slow in you JVM and if yes it frees some objects out of the > >> >>registered Stores. > >> > > >> >Hi, > >> >I think it is better to use java.lang.ref.* to solve problems related to > >> >memory management. > >> >Application threads are not permitted in EJB container and I believe GC > >> >will do it better. > >> > > >> >It is from JDK documentation : > >> >"Soft reference objects, which are cleared at the discretion of the > garbage > >> >collector in response to memory demand. Soft references are most > often used > >> >to implement memory-sensitive caches. " > >> > >>Aha, it's a shame but I never looked into this. But I do it right now! > >>Does anybody(you) have experiences with this soft references and > >>how to use them? > >> > >>Yes I know RTFM ;-)! > >> > >> Gerhard > >> > >>"A man with one watch knows what time it is, > >>a man with two watches is never sure... > >>(Albert Einstein)" > >> > >> > >>-- > >>To unsubscribe, > e-mail: <mailto:[EMAIL PROTECTED]> > >>For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > > > > > > >-- > >To unsubscribe, > e-mail: <mailto:[EMAIL PROTECTED]> > >For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > > > > > >-- >To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> >For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
SynchronizedStore.java
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MemoryStore.java
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ObjectNotFoundException.java
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Store.java
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StoreException.java
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DublicateKeyException.java
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