geode-core/src/main/java/org/apache/geode/internal/cache/entries/VersionedThinRegionEntryOffHeap.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License. You may obtain a
 * copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package org.apache.geode.internal.cache.entries;

import java.util.UUID;

import org.apache.geode.annotations.Immutable;
import org.apache.geode.internal.cache.InlineKeyHelper;
import org.apache.geode.internal.cache.RegionEntry;
import org.apache.geode.internal.cache.RegionEntryContext;
import org.apache.geode.internal.cache.RegionEntryFactory;

public abstract class VersionedThinRegionEntryOffHeap extends VersionedThinRegionEntry
    implements OffHeapRegionEntry {

  public VersionedThinRegionEntryOffHeap(RegionEntryContext context, Object value) {
    super(context, value);
  }

  @Immutable
  private static final VersionedThinRegionEntryOffHeapFactory factory =
      new VersionedThinRegionEntryOffHeapFactory();

  public static RegionEntryFactory getEntryFactory() {
    return factory;
  }

  private static class VersionedThinRegionEntryOffHeapFactory implements RegionEntryFactory {
    @Override
    public RegionEntry createEntry(RegionEntryContext context, Object key, Object value) {
      if (InlineKeyHelper.INLINE_REGION_KEYS) {
        Class<?> keyClass = key.getClass();
        if (keyClass == Integer.class) {
          return new VersionedThinRegionEntryOffHeapIntKey(context, (Integer) key, value);
        } else if (keyClass == Long.class) {
          return new VersionedThinRegionEntryOffHeapLongKey(context, (Long) key, value);
        } else if (keyClass == String.class) {
          final String skey = (String) key;
          final Boolean info = InlineKeyHelper.canStringBeInlineEncoded(skey);
          if (info != null) {
            final boolean byteEncoded = info;
            if (skey.length() <= InlineKeyHelper.getMaxInlineStringKey(1, byteEncoded)) {
              return new VersionedThinRegionEntryOffHeapStringKey1(context, skey, value,
                  byteEncoded);
            } else {
              return new VersionedThinRegionEntryOffHeapStringKey2(context, skey, value,
                  byteEncoded);
            }
          }
        } else if (keyClass == UUID.class) {
          return new VersionedThinRegionEntryOffHeapUUIDKey(context, (UUID) key, value);
        }
      }
      return new VersionedThinRegionEntryOffHeapObjectKey(context, key, value);
    }

    @Override
    public Class getEntryClass() {
      // The class returned from this method is used to estimate the memory size.
      // This estimate will not take into account the memory saved by inlining the keys.
      return VersionedThinRegionEntryOffHeapObjectKey.class;
    }

    @Override
    public RegionEntryFactory makeVersioned() {
      return this;
    }

    @Override
    public RegionEntryFactory makeOnHeap() {
      return VersionedThinRegionEntryHeap.getEntryFactory();
    }
  }
}