Examples of com.caucho.db.block.BlockStore

com.caucho.db.block.BlockStore
The store manages the block-based persistent store file. Each table will have its own store file, table.db. The store is block-based, where each block is 64k. Block allocation is tracked by a free block, block 0. Each block is represented as a two-byte value. The first byte is the allocation code: free, row, or used. The second byte is a fragment allocation mask. Since 64k stores 32k entries, the allocation block can handle a 2G database size. If the database is larger, another free block occurs at block 32k handling another 2G. The blocks are marked as free (00), row (01), used (10) or fragment(11). Row-blocks are table rows, so a table iterator will only look at the row blocks. Used blocks are for special blocks like the free list. Fragments are for blobs. Each store has a unique id in the database. The store id is merged with the block number in the store to create a unique block id. There are 64k allowed stores (and therefore 64k tables), leaving 64 - 16 = 48 bits for the blocks in a table, i.e. 2 ^ 48 blocks = 256T blocks. block index: the block number in the file. address: the address of a byte within the store, treating the file as a flat file. block id: the unique id of the block in the database.
Blobs and fragments
Fragments are stored in 8k chunks with a single byte prefix indicating its use.

  {
    Database db = new Database();
    db.setPath(path);
    db.init();


    BlockStore store = new BlockStore(db, "test", null);
    store.create();


    Block block = store.allocateIndexBlock();
    long blockId = block.getBlockId();
    block.free();


    return new BTree(store, blockId, keySize, new KeyCompare());
  }

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  }


  public static BTree createStringTest(Path path, int keySize)
    throws IOException, java.sql.SQLException
  {
    BlockStore store = BlockStore.create(path);


    Block block = store.allocateIndexBlock();
    long blockId = block.getBlockId();
    block.free();


    return new BTree(store, blockId, keySize, new StringKeyCompare());
  }

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      Database database = new Database();
      database.ensureMemoryCapacity(1024 * 1024);
      database.init();


      _store = new BlockStore(database, name, null, storePath);
      _store.setFlushDirtyBlocksOnCommit(false);
      _store.create();
    } catch (Exception e) {
      throw ConfigException.create(e);
    }

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  {
    Database db = new Database();
    db.setPath(path);
    db.init();


    BlockStore store = new BlockStore(db, "test", null);
    store.create();


    Block block = store.allocateIndexBlock();
    long blockId = block.getBlockId();
    block.free();


    return new BTree(store, blockId, keySize, new KeyCompare());
  }

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  }


  public static BTree createStringTest(Path path, int keySize)
    throws IOException, java.sql.SQLException
  {
    BlockStore store = BlockStore.create(path);


    Block block = store.allocateIndexBlock();
    long blockId = block.getBlockId();
    block.free();


    return new BTree(store, blockId, keySize, new StringKeyCompare());
  }

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      if (storePath.exists()) {
  log.warning(L.l("Removal of old temp file '{0}' failed. Please check permissions.",
              storePath.getNativePath()));
      }
    
      _store = new BlockStore(database, name, null, storePath);
      _store.setFlushDirtyBlocksOnCommit(false);
      _store.create();
    } catch (Exception e) {
      throw ConfigException.create(e);
    }

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Related Classes of com.caucho.db.block.BlockStore

com.caucho.db.Database

com.caucho.db.index.BTree

com.caucho.db.lock.Lock

com.caucho.server.cache.TempFileManager

java.util.concurrent.locks.ReentrantReadWriteLock

java.util.concurrent.locks.Lock

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Examples of com.caucho.db.block.BlockStore

Blobs and fragments

Related Classes of com.caucho.db.block.BlockStore