コード例 #1
0
ファイル: DiskStore.java プロジェクト: martenscs/ehmem
 private DiskElement checkForFreeBlock(int bufferLength) throws IOException {
   DiskElement diskElement = findFreeBlock(bufferLength);
   if (diskElement == null) {
     diskElement = new DiskElement();
     diskElement.position = randomAccessFile.length();
     diskElement.blockSize = bufferLength;
   }
   return diskElement;
 }
コード例 #2
0
ファイル: DiskStore.java プロジェクト: martenscs/ehmem
  /**
   * Marks a block as free.
   *
   * @param diskElement the DiskElement to move to the free space list
   */
  private void freeBlock(final DiskElement diskElement) {
    totalSize -= diskElement.payloadSize;
    diskElement.payloadSize = 0;

    // reset Element meta data
    diskElement.key = null;
    diskElement.hitcount = 0;
    diskElement.expiryTime = 0;

    freeSpace.add(diskElement);
  }
コード例 #3
0
ファイル: DiskStore.java プロジェクト: martenscs/ehmem
  private void writeElement(Element element, Serializable key) throws IOException {
    try {
      int bufferLength;
      long expirationTime = element.getExpirationTime();

      MemoryEfficientByteArrayOutputStream buffer = null;
      try {
        buffer = serializeEntry(element);

        bufferLength = buffer.size();
        DiskElement diskElement = checkForFreeBlock(bufferLength);

        // Write the record
        randomAccessFile.seek(diskElement.position);
        randomAccessFile.write(buffer.toByteArray(), 0, bufferLength);
        buffer = null;

        // Add to index, update stats
        diskElement.payloadSize = bufferLength;
        diskElement.key = key;
        diskElement.expiryTime = expirationTime;
        diskElement.hitcount = element.getHitCount();
        totalSize += bufferLength;
        lastElementSize = bufferLength;
        synchronized (diskElements) {
          diskElements.put(key, diskElement);
        }
      } catch (OutOfMemoryError e) {
        LOG.error("OutOfMemoryError on serialize: " + key);
      }

    } catch (Exception e) {
      // Catch any exception that occurs during serialization
      LOG.error(
          name
              + "Cache: Failed to write element to disk '"
              + key
              + "'. Initial cause was "
              + e.getMessage(),
          e);
    }
  }