Examples of org.apache.hadoop.hbase.io.TagCompressionContext

org.apache.hadoop.hbase.io.TagCompressionContext
Context that holds the dictionary for Tag compression and doing the compress/uncompress. This will be used for compressing tags while writing into HFiles and WALs.

      ByteBuffer dest, HFileBlockDefaultDecodingContext decodingCtx) throws IOException {
    if (decodingCtx.getHFileContext().isIncludesTags()) {
      short tagsLength = (short) ByteBufferUtils.readCompressedInt(source);
      dest.putShort(tagsLength);
      if (tagsLength > 0) {
        TagCompressionContext tagCompressionContext = decodingCtx.getTagCompressionContext();
        // When tag compression is been used in this file, tagCompressionContext will have a not
        // null value passed.
        if (tagCompressionContext != null) {
          tagCompressionContext.uncompressTags(source, dest, tagsLength);
        } else {
          ByteBufferUtils.copyFromStreamToBuffer(dest, source, tagsLength);
        }
      }
    }

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        // It will be overhead to create the TagCompressionContext again and again for every block
        // encoding.
        encodingCtx.getTagCompressionContext().clear();
      } else {
        try {
          TagCompressionContext tagCompressionContext = new TagCompressionContext(
              LRUDictionary.class, Byte.MAX_VALUE);
          encodingCtx.setTagCompressionContext(tagCompressionContext);
        } catch (Exception e) {
          throw new IOException("Failed to initialize TagCompressionContext", e);
        }

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        // It will be overhead to create the TagCompressionContext again and again for every block
        // decoding.
        decodingCtx.getTagCompressionContext().clear();
      } else {
        try {
          TagCompressionContext tagCompressionContext = new TagCompressionContext(
              LRUDictionary.class, Byte.MAX_VALUE);
          decodingCtx.setTagCompressionContext(tagCompressionContext);
        } catch (Exception e) {
          throw new IOException("Failed to initialize TagCompressionContext", e);
        }

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      // Read short as unsigned, high byte first
      int tagsLength = ((in.get() & 0xff) << 8) ^ (in.get() & 0xff);
      ByteBufferUtils.putCompressedInt(out, tagsLength);
      // There are some tags to be written
      if (tagsLength > 0) {
        TagCompressionContext tagCompressionContext = encodingCtx.getTagCompressionContext();
        // When tag compression is enabled, tagCompressionContext will have a not null value. Write
        // the tags using Dictionary compression in such a case
        if (tagCompressionContext != null) {
          tagCompressionContext.compressTags(out, in, tagsLength);
        } else {
          ByteBufferUtils.moveBufferToStream(out, in, tagsLength);
        }
      }
    }

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      int tagsLength = ByteBufferUtils.readCompressedInt(source);
      // Put as unsigned short
      dest.put((byte)((tagsLength >> 8) & 0xff));
      dest.put((byte)(tagsLength & 0xff));
      if (tagsLength > 0) {
        TagCompressionContext tagCompressionContext = decodingCtx.getTagCompressionContext();
        // When tag compression is been used in this file, tagCompressionContext will have a not
        // null value passed.
        if (tagCompressionContext != null) {
          tagCompressionContext.uncompressTags(source, dest, tagsLength);
        } else {
          ByteBufferUtils.copyFromStreamToBuffer(dest, source, tagsLength);
        }
      }
    }

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        // It will be overhead to create the TagCompressionContext again and again for every block
        // encoding.
        encodingCtx.getTagCompressionContext().clear();
      } else {
        try {
          TagCompressionContext tagCompressionContext = new TagCompressionContext(
              LRUDictionary.class, Byte.MAX_VALUE);
          encodingCtx.setTagCompressionContext(tagCompressionContext);
        } catch (Exception e) {
          throw new IOException("Failed to initialize TagCompressionContext", e);
        }

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      this.comparator = comparator;
      this.samePrefixComparator = comparator;
      this.decodingCtx = decodingCtx;
      if (decodingCtx.getHFileContext().isCompressTags()) {
        try {
          tagCompressionContext = new TagCompressionContext(LRUDictionary.class, Byte.MAX_VALUE);
        } catch (Exception e) {
          throw new RuntimeException("Failed to initialize TagCompressionContext", e);
        }
      }
    }

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    }
    rowDict.init(Short.MAX_VALUE);
    familyDict.init(Byte.MAX_VALUE);
    qualifierDict.init(Byte.MAX_VALUE);
    if (hasTagCompression) {
      tagCompressionContext = new TagCompressionContext(dictType, Short.MAX_VALUE);
    }
  }

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