Example usage for com.google.common.hash Hashing goodFastHash

Introduction

In this page you can find the example usage for com.google.common.hash Hashing goodFastHash.

Prototype

public static HashFunction goodFastHash(int minimumBits) 

Source Link

Document

Returns a general-purpose, temporary-use, non-cryptographic hash function.

Usage

From source file:org.apache.niolex.common.guava.GuavaHashing.java

/**
 * @param args//from   w  ww  .  ja  va  2 s .  c  o m
 */
public static void main(String[] args) {
    // Common Hash
    HashFunction hf = Hashing.goodFastHash(32);
    HashCode code = hf.hashObject(new Person(1, "Jiyun", "Xie", 1984), PersonFunnel.INSTANCE);
    System.out.println("Code1 => " + code.asInt());
    code = hf.hashObject(new Person(1, "Jiyun", "Xie", 1985), PersonFunnel.INSTANCE);
    System.out.println("Code2 => " + code.asInt());
    // Consistent Hashing
    HashFunction hf2 = Hashing.goodFastHash(64);
    code = hf2.hashObject(new Person(1, "Jiyun", "Xie", 1984), PersonFunnel.INSTANCE);
    System.out.println("Code3 => " + code.asLong());
    long hash = code.asLong();
    int bucket = Hashing.consistentHash(code, 100);
    System.out.println("Bucket1 => " + bucket);
    bucket = Hashing.consistentHash(hash, 101);
    System.out.println("Bucket2 => " + bucket);
    for (int i = 0; i < 10; ++i) {
        System.out.println("HashTo5 => " + Hashing.consistentHash(i, 5));
        System.out.println("HashTo6 => " + Hashing.consistentHash(i, 6));
    }
    // BloomFilter
    BloomFilter<Person> friends = BloomFilter.create(PersonFunnel.INSTANCE, 500, 0.02);
    for (int i = 0; i < 500; ++i) {
        friends.put(new Person(i, "Jiyun", "Xie", 1984 + i));
    }
    int k = 0;
    for (int i = 0; i < 500; ++i) {
        if (!friends.mightContain(new Person(i, "Jiyun", "Xie", 1984 + i))) {
            System.out.println("Error1 => " + i);
            ++k;
        }
    }
    System.out.println("fnp => (should be 0)" + ((double) k / 500));
    k = 0;
    for (int i = 0; i < 1000; i += 2) {
        if (friends.mightContain(new Person(i, "Jiyun", "Xie", 1984 + i))) {
            //System.out.println("Error2 => " + i);
            ++k;
        }
    }
    System.out.println("fpp => " + ((double) k / 500));
}

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From source file:org.apache.streams.util.GuidUtils.java

/**
 * generateGuid from list of parts./*  ww w. j a v a  2  s  . c  om*/
 * @param parts list of parts
 * @return guid
 */
public static String generateGuid(String... parts) {

    StringBuilder seed = new StringBuilder();

    for (String part : parts) {
        Objects.requireNonNull(part);
        if (StringUtils.isNotBlank(part)) {
            seed.append(part);
        }
    }

    return Arrays.toString(Hashing.goodFastHash(24).hashString(seed, UTF8_CHARSET).asBytes());

}

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From source file:com.wadpam.guja.oauth2.provider.DefaultTokenGenerator.java

@Override
public String generate() {

    byte[] randomBytes = new byte[24];
    random.nextBytes(randomBytes);// ww w  .ja v a2s.  c  o  m

    HashCode hashCode = Hashing.goodFastHash(256).newHasher().putBytes(randomBytes).putLong(System.nanoTime())
            .hash();

    return BaseEncoding.base64Url().omitPadding().encode(hashCode.asBytes());
}

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From source file:com.example.cachedmodel.BaseArrayAdapter.java

public BaseArrayAdapter() {
    mHashFunction = Hashing.goodFastHash(Long.SIZE);
}

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From source file:com.android.tools.idea.run.ApkUploaderService.java

/** Returns true if the apk was uploaded to the device, and false if it was already present on the device. */
public boolean uploadApk(@NotNull IDevice device, @NotNull String localPath, @NotNull String remotePath)
        throws AdbCommandRejectedException, IOException, TimeoutException, SyncException {

    HashCode hash = Files.hash(new File(localPath), Hashing.goodFastHash(32));

    String serial = device.getSerialNumber();
    Map<String, HashCode> cache = myCache.get(serial);
    if (cache != null) {
        HashCode got = cache.get(remotePath);
        if (hash.equals(got)) {
            return false;
        } else {/* www.j a  v  a  2s .  co m*/
            // Remove it in case there is an error uploading the apk.
            cache.remove(remotePath);
        }
    } else {
        cache = Maps.newHashMap();
        myCache.put(serial, cache);
    }

    device.pushFile(localPath, remotePath);
    cache.put(remotePath, hash);
    return true;
}

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From source file:models.RandomProjection.java

public static double deterministicRandom(String value) {
    // obtain a hash function that will generate a 32-bit long hash code
    HashFunction hf = Hashing.goodFastHash(32);

    long i = Hashing.padToLong(hf.hashString(value));

    return 1.0 * i / MAX_HASH_VALUE;
}

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From source file:com.torodb.kvdocument.values.KvArray.java

@Override
public int hashCode() {
    return Hashing.goodFastHash(32).newHasher().putInt(size()).putInt(getElementType().hashCode()).hash()
            .asInt();
}

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From source file:com.android.tools.idea.run.InstalledApkCache.java

@NotNull
private static HashCode hash(@NotNull File apk) throws IOException {
    return Files.hash(apk, Hashing.goodFastHash(32));
}

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From source file:com.torodb.kvdocument.values.KvBinary.java

@Override
public int hashCode() {
    return Hashing.goodFastHash(32).newHasher().putInt(getSubtype().hashCode()).putLong(size()).hash().asInt();
}

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From source file:com.torodb.torod.core.subdocument.values.ScalarArray.java

/**
 * @return/*from   www.ja  v a  2  s .c o  m*/
 *         {@linkplain Hashing#goodFastHash(int) Hashing.goodFastHash(32).newHasher().putInt(size()).putInt(getElementType().hashCode()).hash().asInt();}
 */
@Override
public int hashCode() {
    return Hashing.goodFastHash(32).hashInt(size()).asInt();
}

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