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.client.impl;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufUtil;
  import io.netty.util.Recycler;
  import io.netty.util.Recycler.Handle;
  import io.netty.util.ReferenceCountUtil;
  import java.nio.ByteBuffer;
  import org.apache.bookkeeper.client.api.LedgerEntry;
  
  /**
   * Ledger entry. Its a simple tuple containing the ledger id, the entry-id, and
   * the entry content.
   */
  public class LedgerEntryImpl implements LedgerEntry {
  
      private static final Recycler<LedgerEntryImpl> RECYCLER = new Recycler<LedgerEntryImpl>() {
          @Override
          protected LedgerEntryImpl newObject(Handle<LedgerEntryImpl> handle) {
              return new LedgerEntryImpl(handle);
          }
      };
  
      public static LedgerEntryImpl create(long ledgerId,
                                           long entryId) {
          LedgerEntryImpl entry = RECYCLER.get();
          entry.ledgerId = ledgerId;
          entry.entryId = entryId;
          return entry;
      }
  
      public static LedgerEntryImpl create(long ledgerId,
                                           long entryId,
                                           long length,
                                           ByteBuf buf) {
          LedgerEntryImpl entry = RECYCLER.get();
          entry.ledgerId = ledgerId;
          entry.entryId = entryId;
          entry.length = length;
          entry.entryBuf = buf;
          return entry;
      }
  
      public static LedgerEntryImpl duplicate(LedgerEntry entry) {
          return create(
              entry.getLedgerId(),
              entry.getEntryId(),
              entry.getLength(),
              entry.getEntryBuffer().retainedSlice());
      }
  
      private final Handle<LedgerEntryImpl> recycleHandle;
      private long ledgerId;
      private long entryId;
      private long length;
      private ByteBuf entryBuf;
  
      private LedgerEntryImpl(Handle<LedgerEntryImpl> handle) {
          this.recycleHandle = handle;
      }
  
      public void setEntryId(long entryId) {
          this.entryId = entryId;
      }
  
      public void setLength(long length) {
          this.length = length;
      }
  
      public void setEntryBuf(ByteBuf buf) {
          ReferenceCountUtil.release(entryBuf);
          this.entryBuf = buf;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public long getLedgerId() {
          return ledgerId;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public long getEntryId() {
          return entryId;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public long getLength() {
          return length;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public byte[] getEntryBytes() {
          return ByteBufUtil.getBytes(entryBuf, entryBuf.readerIndex(), entryBuf.readableBytes(), false);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public ByteBuf getEntryBuffer() {
          return entryBuf;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public ByteBuffer getEntryNioBuffer() {
          return entryBuf.nioBuffer();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public LedgerEntryImpl duplicate() {
          return duplicate(this);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void close() {
          recycle();
      }
  
      private void recycle() {
          this.ledgerId = -1L;
          this.entryId = -1L;
          this.length = -1L;
          ReferenceCountUtil.release(entryBuf);
          this.entryBuf = null;
          recycleHandle.recycle(this);
      }
  }
  