Examples of FastByteBuffer

jodd.util.buffer.FastByteBuffer
Fast, fast byte buffer. This buffer implementation does not store all data in single array, but in array of chunks.
org.exist.util.FastByteBuffer
Copied this class from Xalan and adopted it for eXist. Bare-bones, unsafe, fast string buffer. No thread-safety, no parameter range checking, exposed fields. Note that in typical applications, thread-safety of a StringBuffer is a somewhat dubious concept in any case.
Note that Stree and DTM used a single FastStringBuffer as a string pool, by recording start and length indices within this single buffer. This minimizes heap overhead, but of course requires more work when retrieving the data.
FastStringBuffer operates as a "chunked buffer". Doing so reduces the need to recopy existing information when an append exceeds the space available; we just allocate another chunk and flow across to it. (The array of chunks may need to grow, admittedly, but that's a much smaller object.) Some excess recopying may arise when we extract Strings which cross chunk boundaries; larger chunks make that less frequent.
The size values are parameterized, to allow tuning this code. In theory, Result Tree Fragments might want to be tuned differently from the main document's text.
%REVIEW% An experiment in self-tuning is included in the code (using nested FastStringBuffers to achieve variation in chunk sizes), but this implementation has proven to be problematic when data may be being copied from the FSB into itself. We should either re-architect that to make this safe (if possible) or remove that code and clean up for performance/maintainability reasons.

Examples of jodd.util.buffer.FastByteBuffer


  /**
   * Encrypts complete content, block by block.
   */
  public byte[] encrypt(byte[] content) {
    FastByteBuffer fbb = new FastByteBuffer();


    int length = content.length + 1;
    int blockCount = length / blockSizeInBytes;
    int remaining = length;


    int offset = 0;
    for (int i = 0; i < blockCount; i++) {
      if (remaining == blockSizeInBytes) {
        break;
      }
      byte[] encrypted = encryptBlock(content, offset);


      fbb.append(encrypted);


      offset += blockSizeInBytes;
      remaining -= blockSizeInBytes;
    }


    if (remaining != 0) {
      // process remaining bytes
      byte[] block = new byte[blockSizeInBytes];


      System.arraycopy(content, offset, block, 0, remaining - 1);


      block[remaining - 1] = TERMINATOR;


      byte[] encrypted = encryptBlock(block, 0);


      fbb.append(encrypted);
    }


    return fbb.toArray();
  }

View Full Code Here

Examples of jodd.util.buffer.FastByteBuffer


  /**
   * Decrypts the whole content, block by block.
   */
  public byte[] decrypt(byte[] encryptedContent) {
    FastByteBuffer fbb = new FastByteBuffer();


    int length = encryptedContent.length;
    int blockCount = length / blockSizeInBytes;


    int offset = 0;
    for (int i = 0; i < blockCount - 1; i++) {
      byte[] decrypted = decryptBlock(encryptedContent, offset);


      fbb.append(decrypted);


      offset += blockSizeInBytes;
    }


    // process last block
    byte[] decrypted = decryptBlock(encryptedContent, offset);


    // find terminator
    int ndx = blockSizeInBytes - 1;


    while (ndx >= 0) {
      if (decrypted[ndx] == TERMINATOR) {
        break;
      }
      ndx--;
    }


    fbb.append(decrypted, 0, ndx);


    return fbb.toArray();
  }

View Full Code Here

Examples of jodd.util.buffer.FastByteBuffer

  /**
   * Ensures that last buffer exist.
   */
  private void ensureLast() {
    if (last == null) {
      last = new FastByteBuffer();
      list.add(last);
    }
  }

View Full Code Here

Examples of jodd.util.buffer.FastByteBuffer

   * Writes content to the writer.
   */
  public void writeTo(Writer writer) throws IOException {
    for (Object o : list) {
      if (o instanceof FastByteBuffer) {
        FastByteBuffer fastByteBuffer = (FastByteBuffer) o;


        byte[] array = fastByteBuffer.toArray();


        writer.write(new String(array, StringPool.ISO_8859_1));
      }
      else if (o instanceof Uploadable) {
        Uploadable uploadable = (Uploadable) o;

View Full Code Here

Examples of jodd.util.buffer.FastByteBuffer

   * Writes content to the output stream.
   */
  public void writeTo(OutputStream out) throws IOException {
    for (Object o : list) {
      if (o instanceof FastByteBuffer) {
        FastByteBuffer fastByteBuffer = (FastByteBuffer) o;


        out.write(fastByteBuffer.toArray());
      }
      else if (o instanceof Uploadable) {
        Uploadable uploadable = (Uploadable) o;


        InputStream inputStream = uploadable.openInputStream();

View Full Code Here

Examples of jodd.util.buffer.FastByteBuffer


    // loop


    for (Object o : list) {
      if (o instanceof FastByteBuffer) {
        FastByteBuffer fastByteBuffer = (FastByteBuffer) o;
        byte[] bytes = fastByteBuffer.toArray();


        int offset = 0;


        while (offset < bytes.length) {
          // calc the remaining sending chunk size

View Full Code Here

Examples of jodd.util.buffer.FastByteBuffer

   *
   * @param size the initial size.
   * @throws IllegalArgumentException if size is negative.
   */
  public FastByteArrayOutputStream(int size) {
    buffer = new FastByteBuffer(size);
  }

View Full Code Here

Examples of org.exist.util.FastByteBuffer

    
    private static final Logger LOG = Logger.getLogger(VariableByteArrayInput.class);
    
    public VariableByteOutputStream() {
        super();
        buf = new FastByteBuffer(9);
    }

View Full Code Here

Examples of org.exist.util.FastByteBuffer

        buf = new FastByteBuffer(9);
    }


    public VariableByteOutputStream(int size) {
        super();
        buf = new FastByteBuffer(size);
    }

View Full Code Here

Examples of org.exist.util.FastByteBuffer

        buf = new FastByteBuffer(size);
    }


    public void clear() {
        if (buf.size() > MAX_BUFFER_SIZE)
            {buf = new FastByteBuffer(9);}
        else
            {buf.setLength(0);}
    }

View Full Code Here

TOP

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.