Examples of org.helidb.lang.hasher.StringToBigIntegerHasher

org.helidb.lang.hasher.StringToBigIntegerHasher
This {@link Hasher} uses a {@link MessageDigest} object with a configurablehash algorithm to produce a hash of a configurable length from a {@link String}. It does not support {@code null} values.
Any {@link MessageDigest} function may be used for creating the hash, as longas the hash it produces is at least as long as this object is configured to expect it to be. The hash bytes are extracted from the hash produced by the {@link MessageDigest} by taking its first bytes up to the configured length. @author Karl Gustafsson @since 1.0 @see StringToLongHasher

        nr = new LruCacheNodeRepository<BigInteger, Long>(nr, m_bTreeLruNodeCacheSize);
      }
      BPlusTree<BigInteger, Long> btree = new BPlusTree<BigInteger, Long>(nr, lah);
      // Only use 7 bits of the most significant byte when hashing to
      // avoid collisions with the serialized null value
      b = new BPlusTreeIndexBackend<String, String, BigInteger, Long>(b, false, btree, new StringToBigIntegerHasher(STRING_HASH_SIZE, 7), lah);


      LoggingTransactionalDatabase<String, String, Long> db = new LoggingTransactionalDatabase<String, String, Long>(b, new ReadWritableFileAdapter(logf), StringSerializer.INSTANCE, StringSerializer.INSTANCE, lah);
      m_dbFiles.put(System.identityHashCode(db), new File[] { f, treef, logf });
      m_databases.add(db);
    }

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        nr = new LruCacheNodeRepository<BigInteger, Long>(nr, m_bTreeLruNodeCacheSize);
      }
      BPlusTree<BigInteger, Long> btree = new BPlusTree<BigInteger, Long>(nr, lah);
      // Only use 7 bits of the most significant byte when hashing to
      // avoid collisions with the serialized null value
      b = new BPlusTreeIndexBackend<String, String, BigInteger, Long>(b, false, btree, new StringToBigIntegerHasher(STRING_HASH_SIZE, 7), lah);


      SimpleDatabase<String, String, Long> db = new SimpleDatabase<String, String, Long>(b, lah);
      m_dbFiles.put(System.identityHashCode(db), new File[] { f, treef });
      m_databases.add(db);
    }

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        nrb = new LruCacheNodeRepositoryBuilder<BigInteger, Long>().setProxiedBuilder(nrb).setMaxCacheSize(m_bTreeLruNodeCacheSize);
      }
      DatabaseBackendFactory<String, String, Long> baf = new HeapBackendFactory<String, String>(StringSerializer.INSTANCE, StringSerializer.INSTANCE, lah);
      // Only use 7 bits of the most significant byte when hashing to
      // avoid collisions with the serialized null value
      baf = new BPlusTreeIndexBackendFactory<String, String, BigInteger, Long>(baf, nrb, new StringToBigIntegerHasher(STRING_HASH_SIZE, 7), lah);
      ShadowCopyTransactionalDatabase<String, String, Long> db = new ShadowCopyTransactionalDatabase<String, String, Long>(new SingleFileAndProxiedFileManager(new SingleFileManager(ff, tmpDirD), indff, tmpDirD), baf, false, lah);
      m_dbFiles.put(System.identityHashCode(db), new File[] { f, tmpDir, indf });
      m_databases.add(db);
    }
  }

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Related Classes of org.helidb.lang.hasher.StringToBigIntegerHasher

org.helidb.resources.perf.LoggingTransactionalDatabaseHeapWBPlusTreeIndexConfiguration

org.helidb.resources.perf.ShadowCopyTransactionalDatabaseHeapWBPlusTreeIndexConfiguration

org.helidb.resources.perf.SimpleDatabaseHeapWBPlusTreeIndexConfiguration

java.math.BigInteger

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