ceph/src/rocksdb/java/src/main/java/org/rocksdb/Filter.java

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5
   6 package org.rocksdb;
   7
   8 /**
   9  * Filters are stored in rocksdb and are consulted automatically
  10  * by rocksdb to decide whether or not to read some
  11  * information from disk. In many cases, a filter can cut down the
  12  * number of disk seeks form a handful to a single disk seek per
  13  * DB::Get() call.
  14  */
  15 //TODO(AR) should be renamed FilterPolicy
  16 public abstract class Filter extends RocksObject {
  17
  18   protected Filter(final long nativeHandle) {
  19     super(nativeHandle);
  20   }
  21
  22   /**
  23    * Deletes underlying C++ filter pointer.
  24    *
  25    * Note that this function should be called only after all
  26    * RocksDB instances referencing the filter are closed.
  27    * Otherwise an undefined behavior will occur.
  28    */
  29   @Override
  30   protected void disposeInternal() {
  31     disposeInternal(nativeHandle_);
  32   }
  33
  34   @Override
  35   protected final native void disposeInternal(final long handle);
  36 }