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缓存应用的回写模式

MaxWen 2022-03-12 阅读 50

异步写

CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder().using(
  PooledExecutionServiceConfigurationBuilder.newPooledExecutionServiceConfigurationBuilder().pool("writeBehindPool",1,5).build())

org.ehcache.Cache<String,String> myCache = cacheManager.createCache("myCache",CacheConfigurationBuilder.newCacheConfigurationBuilder(String.class,String.class,ResourcePoolsBuilder.newResourcePoolsBuilder().heap(100,MemoryUnit.MB)))
.withDispatcherConcurrency(4)
.withExpiry(Expirations.timeToLiveExpiration(Duration.of(10,TimeUnit.SECONDS)))
.withLoaderWriter(
  new DefaultCacheLoaderWriter<String,String>(){
    @Override
    public void write(String key,String value){
      //write
    }

    @Override
    public void delete(String key){
      //delete
    }
  }
)
.add(
  WriteBehindConfigurationBuuilder.
  newUnBatchWriteBehindConfiguration()
  .queueSize(5)
  .concurrencyLevel(2)
  .userThreadPool("writeBehindPool")
  .build()
);
)

for(int i = 0;i< writeBehindConcurrency;i++){
  if(config.getBatchingConfiguration() == null){
    this.stripes.add(
      new NonBatchingLocalHeapWriteBehindQueue<K,V>(executionService,defaultThreadPool,config,cacheLoaderWriter);
    );
  }else{
    new BatchingLocalHeapWriteBehindQueue<K,V>(
    executionService,defaultThreadPool,config,cacheLoaderWriter);
  }

}

批量写

.withLoaderWriter(
  new DefaultCacheLoaderWriter<String,String>(){
   @Override
   public void writeAll() throws BulkCacheWritingException,Exception{
    for(Object entry:entries){
      //batch write
    }
  }

  @Override
  public void deleteAll(Iterable<> keys) throws BuikCacheWritingException,Exception{
   
   for(Object key:keys){
     //batch delete
   }

  }
  }

)
.add(
  WriteBehindConfigurationBuilder
   .newBatchedWriteBehindConfiguration(3,TimeUnit.SECONDS,2)
   .queueSize(5)
   .concurrencyLevel(1)
   .enableCoalescing()
   .userThreadPool("writeBehindPool")
   .build())
);
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