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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.codec.prefixtree.encode;
19  
20  import java.io.OutputStream;
21  import java.util.concurrent.BlockingQueue;
22  import java.util.concurrent.LinkedBlockingQueue;
23  
24  import org.apache.hadoop.classification.InterfaceAudience;
25  
26  @InterfaceAudience.Private
27  public class EncoderPoolImpl implements EncoderPool {
28  
29    private BlockingQueue<PrefixTreeEncoder> unusedEncoders = 
30        new LinkedBlockingQueue<PrefixTreeEncoder>();
31  
32    @Override
33    public PrefixTreeEncoder checkOut(OutputStream outputStream, boolean includeMvccVersion) {
34      PrefixTreeEncoder encoder = unusedEncoders.poll();
35      if (encoder == null) {
36        encoder = new PrefixTreeEncoder(outputStream, includeMvccVersion);
37      } else {
38        encoder.reset(outputStream, includeMvccVersion);
39      }
40      return encoder;
41    }
42  
43    @Override
44    public void checkIn(PrefixTreeEncoder encoder) {
45      this.unusedEncoders.add(encoder);
46    }
47  }