Class DirectBufferCache

java.lang.Object
io.undertow.server.handlers.cache.DirectBufferCache

public class DirectBufferCache extends Object
A non-blocking buffer cache where entries are indexed by a path and are made up of a subsequence of blocks in a fixed large direct buffer. An ideal application is a file system cache, where the path corresponds to a file location.

To reduce contention, entry allocation and eviction execute in a sampling fashion (entry hits modulo N). Eviction follows an LRU approach (oldest sampled entries are removed first) when the cache is out of capacity

In order to expedite reclamation, cache entries are reference counted as opposed to garbage collected.

Author:
Jason T. Greene
  • Constructor Details

    • DirectBufferCache

      public DirectBufferCache(int sliceSize, int slicesPerPage, int maxMemory)
    • DirectBufferCache

      public DirectBufferCache(int sliceSize, int slicesPerPage, int maxMemory, org.xnio.BufferAllocator<ByteBuffer> bufferAllocator)
    • DirectBufferCache

      public DirectBufferCache(int sliceSize, int slicesPerPage, int maxMemory, org.xnio.BufferAllocator<ByteBuffer> bufferAllocator, int maxAge)
  • Method Details