/**
* Creates output stream for next block of data.
*
* @throws IOException serialization or block hash calculation error.
*/
private synchronized void nextBlockOutputStream() throws IOException {
blockData = PithosSerializer.serializeFile(backupFile);
container = pithosPath.getContainer();
hashAlgo =
PithosFileSystem.getHadoopPithosConnector().getPithosContainerHashAlgorithm(container);
try {
blockHash = Utils.computeHash(blockData, hashAlgo);
if (!PithosFileSystem.getHadoopPithosConnector()
.pithosObjectBlockExists(container, blockHash)) {
nextBlock = new PithosBlock(blockHash, bytesWrittenToBlock, blockData);
bytesWrittenToBlock = 0;
}
} catch (NoSuchAlgorithmException e) {
throw new IOException(e);
} catch (Exception e) {
Utils.dbgPrint("nextBlockOutputStream exception >", e.toString());
throw new IOException(e);
}
}
/**
* Streams block to pithos when file buffer full. Prepares next file buffer.
*
* @throws IOException backupFile not found.
*/
private synchronized void endBlock() throws IOException {
backupStream.close();
// - Load file bytes
nextBlockOutputStream();
// - Append Pithos Block on the existing object
PithosFileSystem.getHadoopPithosConnector()
.appendPithosBlock(
pithosPath.getContainer(), pithosPath.getObjectAbsolutePath(), nextBlock);
//
// Delete local backup, start new one
//
backupFile.delete();
backupFile = null;
backupFile = newBackupFile();
backupStream = new FileOutputStream(backupFile);
bytesWrittenToBlock = 0;
}
