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          The following document illustrates several basic JCS configurations. As you'll see, using JCS can be as simple as creating a single memory cache for you application. However, with a few configuration changes, you can quickly enable some distributed caching features that can scale your application even further.

          Building a cache.ccf file

          Configuring the JCS can be as simple as your needs. The most basic configuration would be a pure memory cache where every region takes the default values. The complete configuration file (cache.ccf) could look like this:

          # DEFAULT CACHE REGION   

          jcs.
          default=
          jcs.
          default.cacheattributes=
              org.apache.jcs.engine.CompositeCacheAttributes
          jcs.
          default.cacheattributes.MaxObjects=1000
          jcs.
          default.cacheattributes.MemoryCacheName=
              org.apache.jcs.engine.memory.lru.LRUMemoryCache
                  
          If you want to add memory shrinking then you can add these lines: 

          jcs.
          default.cacheattributes.cacheattributes.UseMemoryShrinker=true
          jcs.
          default.cacheattributes.cacheattributes.MaxMemoryIdleTimeSeconds=3600
          jcs.
          default.cacheattributes.cacheattributes.ShrinkerIntervalSeconds=60

          Adding a disk cache is as simple as telling it what folder to use. It is recommended that you add a disk cache. If you want to add a disk cache to your default parameters, then (1) add this to the bottom of the file to create the auxiliary:

          jcs.auxiliary.DC=
              org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory
          jcs.auxiliary.DC.attributes
          =
              org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributes
          jcs.auxiliary.DC.attributes.DiskPath
          =g:/dev/jakarta-turbine-stratum/raf

          and (2) change the first line to:

          jcs.default=DC

          It is a good idea to specify the system.GroupIdCache, so add this to the file:

          jcs.system.groupIdCache=DC
          jcs.system.groupIdCache.cacheattributes
          =
              org.apache.jcs.engine.CompositeCacheAttributes
          jcs.system.groupIdCache.cacheattributes.MaxObjects
          =10000
          jcs.system.groupIdCache.cacheattributes.MemoryCacheName
          =
              org.apache.jcs.engine.memory.lru.LRUMemoryCache

          If you want to predefine a specific region, say called testCache1, then add these lines:

          jcs.region.testCache1=DC
          jcs.region.testCache1.cacheattributes
          =
              org.apache.jcs.engine.CompositeCacheAttributes
          jcs.region.testCache1.cacheattributes.MaxObjects
          =1000
          jcs.region.testCache1.cacheattributes.MemoryCacheName
          =
              org.apache.jcs.engine.memory.lru.LRUMemoryCache
          jcs.region.testCache1.cacheattributes.UseMemoryShrinker
          =true
          jcs.region.testCache1.cacheattributes.MaxMemoryIdleTimeSeconds
          =3600
          jcs.region.testCache1.cacheattributes.ShrinkerIntervalSeconds
          =60

          If you want to add a lateral cache for distribution (the TCP Lateral Auxiliary is recommended), then add these lines to the bottom of the file to define the auxiliary:

          jcs.auxiliary.LTCP=
              org.apache.jcs.auxiliary.lateral.LateralCacheFactory
          jcs.auxiliary.LTCP.attributes
          =
              org.apache.jcs.auxiliary.lateral.LateralCacheAttributes
          jcs.auxiliary.LTCP.attributes.TransmissionTypeName
          =TCP
          jcs.auxiliary.LTCP.attributes.TcpServers
          =localhost:1111
          jcs.auxiliary.LTCP.attributes.TcpListenerPort
          =1110
          jcs.auxiliary.LTCP.attributes.PutOnlyMode
          =false

          See the TCP Lateral documentation for more information. If you want to set up testCache1 to use this, then change the definition to:

          jcs.region.testCache1=DC,LTCP

          A few comments on configuration

          Auxiliary definitions are like log4j appenders, they are defines and then associated with a region like a log4j category.

          The order of configuration file is unimportant, though you should try to keep it organized for your own sake.

          Configuration is being refactored and is subject to change. It should only become easier.

          The complete file

          The complete file from above would look like this:

          # DEFAULT CACHE REGION   
          
          jcs.default=DC,LTCP
          jcs.default.cacheattributes=
              org.apache.jcs.engine.CompositeCacheAttributes
          jcs.default.cacheattributes.MaxObjects=1000
          jcs.default.cacheattributes.MemoryCacheName=
              org.apache.jcs.engine.memory.lru.LRUMemoryCache
          
          # System CACHE REGION   
          jcs.system.groupIdCache=DC,LTCP
          jcs.system.groupIdCache.cacheattributes=
              org.apache.jcs.engine.CompositeCacheAttributes
          jcs.system.groupIdCache.cacheattributes.MaxObjects=10000
          jcs.system.groupIdCache.cacheattributes.MemoryCacheName=
              org.apache.jcs.engine.memory.lru.LRUMemoryCache
          
          # PRE-DEFINED CACHE REGIONS   
          
          jcs.region.testCache1=DC,LTCP
          jcs.region.testCache1.cacheattributes=
              org.apache.jcs.engine.CompositeCacheAttributes
          jcs.region.testCache1.cacheattributes.MaxObjects=1000
          jcs.region.testCache1.cacheattributes.MemoryCacheName=
              org.apache.jcs.engine.memory.lru.LRUMemoryCache
          jcs.region.testCache1.cacheattributes.UseMemoryShrinker=true
          jcs.region.testCache1.cacheattributes.MaxMemoryIdleTimeSeconds=3600
          jcs.region.testCache1.cacheattributes.ShrinkerIntervalSeconds=60
          
          # AVAILABLE AUXILIARY CACHES   
          jcs.auxiliary.DC=
              org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory
          jcs.auxiliary.DC.attributes=
              org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributes
          jcs.auxiliary.DC.attributes.DiskPath=g:/dev/jakarta-turbine-stratum/raf
          jcs.auxiliary.DC.attributes.maxKeySize=100000
          
          jcs.auxiliary.LTCP=
              org.apache.jcs.auxiliary.lateral.LateralCacheFactory
          jcs.auxiliary.LTCP.attributes=
              org.apache.jcs.auxiliary.lateral.LateralCacheAttributes
          jcs.auxiliary.LTCP.attributes.TransmissionTypeName=TCP
          jcs.auxiliary.LTCP.attributes.TcpServers=localhost:1111
          jcs.auxiliary.LTCP.attributes.TcpListenerPort=1110
          jcs.auxiliary.LTCP.attributes.PutOnlyMode=false
          
          posted on 2005-02-04 11:21 jacky 閱讀(731) 評論(0)  編輯  收藏 所屬分類: Open source
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