Examples of org.helidb.lang.hasher.StringToLongHasher

org.helidb.lang.hasher.StringToLongHasher
This {@link Hasher} uses a {@link MessageDigest} object with a configurablehash algorithm to produce an eight bytes long hash 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 eight bytes long. The eight bytes are extracted from the hash produced by the {@link MessageDigest} by taking itsfirst eight bytes.
Instead of instantiating this class with the no-arguments constructor, the singleton instance {@link #INSTANCE} may be used. @author Karl Gustafsson @since 1.0 @see StringToBigIntegerHasher

  {
    LogAdapterHolder lah = new LogAdapterHolder(new StdOutLogAdapter());
    BPlusTreeIndexBackendFileBackedNodeRepositoryBuilder<Long> nrb = new BPlusTreeIndexBackendFileBackedNodeRepositoryBuilder<Long>();
    nrb.setKeySerializer(LongNullSerializer.INSTANCE);
    nrb.setLogAdapterHolder(lah);
    ShadowCopyTransactionalDatabase<String, String, Long> res = new ShadowCopyTransactionalDatabase<String, String, Long>(new BPlusTreeIndexFileManager(new HeapBackendFileManager(f, dir), indf, dir), new BPlusTreeIndexBackendFactory<String, String, Long, Long>(new HeapBackendFactory<String, String>(StringSerializer.INSTANCE, StringSerializer.INSTANCE, lah), new LruCacheNodeRepositoryBuilder<Long, Long>().setProxiedBuilder(nrb), new StringToLongHasher(), lah), false, lah);
    m_dbFiles.put(res, new Entity[] { dir, f, indf });
    return res;
  }

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  {
    File f = FileSupport.createTempFile();
    File indf = FileSupport.createTempFile();
    LogAdapterHolder lah = new LogAdapterHolder(new StdOutLogAdapter());
    BPlusTree<Long, Long> btr = new BPlusTree<Long, Long>(new LruCacheNodeRepository<Long, Long>(new FileBackedNodeRepository<Long, Long>(new ReadWritableFileAdapter(indf), false, 0, new NumberOfRecordsNodeSizeStrategy(3), true, LongNullSerializer.INSTANCE, LongSerializer.INSTANCE, 4, 8192, null, lah), 10), lah);
    DatabaseBackend<String, String, Long> b = new BPlusTreeIndexBackend<String, String, Long, Long>(new HeapBackend<String, String>(new ReadWritableFileAdapter(f), false, StringSerializer.INSTANCE, StringSerializer.INSTANCE, lah), false, btr, new StringToLongHasher(), lah);
    SimpleDatabase<String, String, Long> res = new SimpleDatabase<String, String, Long>(b, lah);
    m_dbFiles.put(System.identityHashCode(res), new File[] { f, indf });
    return res;
  }

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    File dbFile = FileSupport.createTempFile();
    File indexFile = FileSupport.createTempFile();
    LogAdapterHolder lah = new LogAdapterHolder(new StdOutLogAdapter());
    // Set a ridiculously low buffer size
    HeapBackend<String, String> hb = new HeapBackend<String, String>(new ReadWritableFileAdapter(dbFile), false, StringSerializer.INSTANCE, StringSerializer.INSTANCE, 0L, 4, lah);
    BPlusTreeIndexBackend<String, String, Long, Long> res = new BPlusTreeIndexBackend<String, String, Long, Long>(hb, false, new BPlusTree<Long, Long>(new FileBackedNodeRepository<Long, Long>(new ReadWritableFileAdapter(indexFile), false, 0, new NumberOfRecordsNodeSizeStrategy(5), true, LongNullSerializer.INSTANCE, LongSerializer.INSTANCE, 6, 8192, null, lah), lah), new StringToLongHasher(), lah);
    m_dbFiles.put(res, dbFile);
    m_indexFiles.put(res, indexFile);
    return res;
  }

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

org.helidb.backend.index.bplus.BPlusTreeIndexBackendOnHeapBackendTest

org.helidb.impl.txn.sc.ScTxnDbOnHeapBackendWBPlusTreeIndexTest

org.helidb.simple.SimpleDatabaseOnHeapBackendWithBPlusTreeIndexTest

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