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From Juozas Baliuka <bali...@mwm.lt>
Subject RE: [simplestore] inital check in
Date Tue, 15 Jan 2002 17:36:58 GMT
Hi,
I think simple store is too simple :).
I see some things to do for simple store.
1. Add meaningful exception classes
2. Add some helper key class for keys like Class + OID :
  Object key = new OID( myClass, someKey  );
3.Add simple finders and batch to store interface for optimizations:
  store(Map map);
  Iterator find( String myRegistredProcedure, String property);
// " SELECT it_is_from_procedure_descriptor FROM Some_Table WHERE 
myProc(property) = 1 "
  Iterator find(Collection idCollection);
4. Ability to register and call stored procedures  on sorage :
  registerProcedure(String alias,ProcedureDescriptor p);
  Object retValueOrValues = call(alias,paramArray);
5. Tranzaction listeners.


At 01:09 PM 1/15/2002 +0100, you wrote:

>Hi Juozas,
>do you have interest to move your implemenation to my simplestore
>package?
>The only thing you have to do, is to replace your Store interface with
>my Store interface.
>
>I identify two objects we can need:
>- your MemoryStore, maybe it needs a new name.
>- your SynchronizedStore, that can we use for all our Stores.
>
>It would be kool to have it!
>
>What do you think?
>
>Greets
>
>    Gerhard
>
>
>
>
> 
>
>                     Juozas 
> Baliuka 
>
>                     <baliuka@mwm.l       To:     "Jakarta Commons 
> Developers List"
>                     t> 
> <commons-dev@jakarta.apache.org>
>                                          cc: 
>
>                     15.01.2002           Subject:     RE: [simplestore] 
> inital check in
>                     13:46 
>
>                     Please 
> respond 
>
>                     to 
> "Jakarta 
>
>                     Commons 
>
>                     Developers 
>
>                     List" 
>
> 
>
> 
>
>
>
>
>
>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 removed from queue, size15
>102 removed from queue, size14
>103 removed from queue, size13
>104 removed from queue, size12
>105 removed from queue, size11
>106 removed from queue, size10
>107 removed from queue, size9
>108 removed from queue, size8
>109 removed from queue, size7
>115 removed from queue, size15
>116 removed from queue, size14
>117 removed from queue, size13
>118 removed from queue, size12
>110 removed from queue, size11
>111 removed from queue, size10
>112 removed from queue, size9
>113 removed from queue, size8
>114 removed from queue, size7
>119 removed from queue, size15
>120 removed from queue, size14
>121 removed from queue, size13
>122 removed from queue, size12
>123 removed from queue, size11
>124 removed from queue, size10
>125 removed from queue, size9
>126 removed from queue, size8
>127 removed from queue, size7
>128 removed from queue, size15
>129 removed from queue, size14
>130 removed from queue, size13
>131 removed from queue, size12
>132 removed from queue, size11
>133 removed from 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:baliuka@mwm.lt]
> > >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:baliuka@mwm.lt]
> > >> >
> > >> >>
> > >> >>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)"
> > >>
> > >>
> > >>--
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>#### SynchronizedStore.java has been removed from this note on January 15
>2002 by Gerhard Froehlich
>#### MemoryStore.java has been removed from this note on January 15 2002 by
>Gerhard Froehlich
>#### ObjectNotFoundException.java has been removed from this note on
>January 15 2002 by Gerhard Froehlich
>#### Store.java has been removed from this note on January 15 2002 by
>Gerhard Froehlich
>#### StoreException.java has been removed from this note on January 15 2002
>by Gerhard Froehlich
>#### DublicateKeyException.java has been removed from this note on January
>15 2002 by Gerhard Froehlich
>
>
>
>
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