content: /*
   * 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.bookkeeper.statelib.impl.mvcc;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.util.Recycler;
  import io.netty.util.ReferenceCountUtil;
  import java.util.function.Predicate;
  import lombok.Data;
  import lombok.Getter;
  import lombok.Setter;
  import org.apache.bookkeeper.api.kv.impl.result.KeyValueFactory;
  import org.apache.bookkeeper.api.kv.impl.result.KeyValueImpl;
  import org.apache.bookkeeper.api.kv.options.RangeOption;
  import org.apache.bookkeeper.common.coder.Coder;
  import org.apache.bookkeeper.common.util.Recycled;
  import org.apache.bookkeeper.stream.proto.kv.store.ValueType;
  
  /**
   * An object represents the mvcc metadata and value for a given key.
   */
  @Data
  @Setter
  @Getter
  public class MVCCRecord implements Recycled, Predicate<RangeOption<?>> {
  
      public static MVCCRecord newRecord() {
          return RECYCLER.get();
      }
  
      private static final Recycler<MVCCRecord> RECYCLER = new Recycler<MVCCRecord>() {
          @Override
          protected MVCCRecord newObject(Handle<MVCCRecord> handle) {
              return new MVCCRecord(handle);
          }
      };
  
      private ByteBuf value;
      private long number;
      private final Recycler.Handle<MVCCRecord> handle;
      private long createRev;
      private long modRev;
      private long version;
      private ValueType valueType = ValueType.BYTES;
      private long expireTime;
  
      private MVCCRecord(Recycler.Handle<MVCCRecord> handle) {
          this.handle = handle;
      }
  
      public MVCCRecord duplicate() {
          MVCCRecord record = newRecord();
          record.createRev = createRev;
          record.modRev = modRev;
          record.version = version;
          record.valueType = valueType;
          record.value = value.retainedSlice();
          record.number = number;
          record.expireTime = expireTime;
          return record;
      }
  
      public int compareModRev(long revision) {
          return Long.compare(modRev, revision);
      }
  
      public int compareCreateRev(long revision) {
          return Long.compare(createRev, revision);
      }
  
      public int compareVersion(long version) {
          return Long.compare(this.version, version);
      }
  
      public void setValue(ByteBuf buf, ValueType valueType) {
          if (null != value) {
              ReferenceCountUtil.release(value);
          }
          this.value = buf;
          this.valueType = valueType;
          if (ValueType.NUMBER == valueType) {
              this.number = buf.getLong(0);
          }
      }
  
      public boolean expired() {
          return expireTime != 0 && expireTime > System.currentTimeMillis();
      }
  
      private void reset() {
          if (null != value) {
              ReferenceCountUtil.release(value);
              value = null;
          }
          modRev = -1L;
          createRev = -1L;
          version = -1L;
          number = -1L;
          valueType = ValueType.BYTES;
      }
  
      @Override
      public void recycle() {
          reset();
          handle.recycle(this);
      }
  
      <K, V> KeyValueImpl<K, V> asKVRecord(KeyValueFactory<K, V> recordFactory,
                                           K key,
                                           Coder<V> valCoder) {
          return recordFactory.newKv()
              .key(key)
              .value(valCoder.decode(value))
              .createRevision(createRev)
              .modifiedRevision(modRev)
              .version(version)
              .isNumber(ValueType.NUMBER == valueType)
              .numberValue(number);
      }
  
      @Override
      public boolean test(RangeOption<?> rangeOption) {
          if (null == rangeOption) {
              return true;
          }
          return createRev >= rangeOption.minCreateRev()
              && createRev <= rangeOption.maxCreateRev()
              && modRev >= rangeOption.minModRev()
              && modRev <= rangeOption.maxModRev();
      }
  }
  