Examples with BigInteger java.math.BigInteger used on opensource projects

Example 16 with BigInteger

use of java.math.BigInteger in project hadoop by apache.

the class ProcfsBasedProcessTree method getCpuUsagePercent.

/**
   * Get the CPU usage by all the processes in the process-tree in Unix.
   * Note: UNAVAILABLE will be returned in case when CPU usage is not
   * available. It is NOT advised to return any other error code.
   *
   * @return percentage CPU usage since the process-tree was created,
   * {@link #UNAVAILABLE} if CPU usage cannot be calculated or not available.
   */
@Override
public float getCpuUsagePercent() {
    BigInteger processTotalJiffies = getTotalProcessJiffies();
    cpuTimeTracker.updateElapsedJiffies(processTotalJiffies, clock.getTime());
    return cpuTimeTracker.getCpuTrackerUsagePercent();
}

Example 17 with BigInteger

use of java.math.BigInteger in project hadoop by apache.

the class ProcfsBasedProcessTree method getTotalProcessJiffies.

private BigInteger getTotalProcessJiffies() {
    BigInteger totalStime = BigInteger.ZERO;
    long totalUtime = 0;
    for (ProcessInfo p : processTree.values()) {
        if (p != null) {
            totalUtime += p.getUtime();
            totalStime = totalStime.add(p.getStime());
        }
    }
    return totalStime.add(BigInteger.valueOf(totalUtime));
}

Example 18 with BigInteger

use of java.math.BigInteger in project hadoop by apache.

the class WindowsBasedProcessTree method getCpuUsagePercent.

/**
   * Get the CPU usage by all the processes in the process-tree in Windows.
   * Note: UNAVAILABLE will be returned in case when CPU usage is not
   * available. It is NOT advised to return any other error code.
   *
   * @return percentage CPU usage since the process-tree was created,
   * {@link #UNAVAILABLE} if CPU usage cannot be calculated or not available.
   */
@Override
public float getCpuUsagePercent() {
    BigInteger processTotalMs = getTotalProcessMs();
    cpuTimeTracker.updateElapsedJiffies(processTotalMs, clock.getTime());
    return cpuTimeTracker.getCpuTrackerUsagePercent();
}

Example 19 with BigInteger

use of java.math.BigInteger in project hbase by apache.

the class Bytes method iterateOnSplits.

/**
   * Iterate over keys within the passed range.
   */
public static Iterable<byte[]> iterateOnSplits(final byte[] a, final byte[] b, boolean inclusive, final int num) {
    byte[] aPadded;
    byte[] bPadded;
    if (a.length < b.length) {
        aPadded = padTail(a, b.length - a.length);
        bPadded = b;
    } else if (b.length < a.length) {
        aPadded = a;
        bPadded = padTail(b, a.length - b.length);
    } else {
        aPadded = a;
        bPadded = b;
    }
    if (compareTo(aPadded, bPadded) >= 0) {
        throw new IllegalArgumentException("b <= a");
    }
    if (num <= 0) {
        throw new IllegalArgumentException("num cannot be <= 0");
    }
    byte[] prependHeader = { 1, 0 };
    final BigInteger startBI = new BigInteger(add(prependHeader, aPadded));
    final BigInteger stopBI = new BigInteger(add(prependHeader, bPadded));
    BigInteger diffBI = stopBI.subtract(startBI);
    if (inclusive) {
        diffBI = diffBI.add(BigInteger.ONE);
    }
    final BigInteger splitsBI = BigInteger.valueOf(num + 1);
    //when diffBI < splitBI, use an additional byte to increase diffBI
    if (diffBI.compareTo(splitsBI) < 0) {
        byte[] aPaddedAdditional = new byte[aPadded.length + 1];
        byte[] bPaddedAdditional = new byte[bPadded.length + 1];
        for (int i = 0; i < aPadded.length; i++) {
            aPaddedAdditional[i] = aPadded[i];
        }
        for (int j = 0; j < bPadded.length; j++) {
            bPaddedAdditional[j] = bPadded[j];
        }
        aPaddedAdditional[aPadded.length] = 0;
        bPaddedAdditional[bPadded.length] = 0;
        return iterateOnSplits(aPaddedAdditional, bPaddedAdditional, inclusive, num);
    }
    final BigInteger intervalBI;
    try {
        intervalBI = diffBI.divide(splitsBI);
    } catch (Exception e) {
        LOG.error("Exception caught during division", e);
        return null;
    }
    final Iterator<byte[]> iterator = new Iterator<byte[]>() {

        private int i = -1;

        @Override
        public boolean hasNext() {
            return i < num + 1;
        }

        @Override
        public byte[] next() {
            i++;
            if (i == 0)
                return a;
            if (i == num + 1)
                return b;
            BigInteger curBI = startBI.add(intervalBI.multiply(BigInteger.valueOf(i)));
            byte[] padded = curBI.toByteArray();
            if (padded[1] == 0)
                padded = tail(padded, padded.length - 2);
            else
                padded = tail(padded, padded.length - 1);
            return padded;
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    };
    return new Iterable<byte[]>() {

        @Override
        public Iterator<byte[]> iterator() {
            return iterator;
        }
    };
}

Example 20 with BigInteger

use of java.math.BigInteger in project hbase by apache.

the class ByteBufferUtils method toBigDecimal.

/**
   * Reads a BigDecimal value at the given buffer's offset.
   * @param buffer
   * @param offset
   * @return BigDecimal value at offset
   */
public static BigDecimal toBigDecimal(ByteBuffer buffer, int offset, int length) {
    if (buffer == null || length < Bytes.SIZEOF_INT + 1 || (offset + length > buffer.limit())) {
        return null;
    }
    int scale = toInt(buffer, offset);
    byte[] tcBytes = new byte[length - Bytes.SIZEOF_INT];
    copyFromBufferToArray(tcBytes, buffer, offset + Bytes.SIZEOF_INT, 0, length - Bytes.SIZEOF_INT);
    return new BigDecimal(new BigInteger(tcBytes), scale);
}