java.io.RandomAccessFile.readLong()方法的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中java.io.RandomAccessFile.readLong方法的一些代码示例，展示了RandomAccessFile.readLong的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。RandomAccessFile.readLong方法的具体详情如下：
包路径：java.io.RandomAccessFile
类名称：RandomAccessFile
方法名：readLong

RandomAccessFile.readLong介绍

[英]Reads a big-endian 64-bit long from the current position in this file. Blocks until eight bytes have been read, the end of the file is reached or an exception is thrown.
[中]从文件中的当前位置读取64位长的大端字节。块，直到读取了八个字节，到达文件末尾或引发异常。

代码示例

代码示例来源：origin: scouter-project/scouter

private void load() throws IOException {
  raf.seek(0);
  counts = raf.readLong();
}

代码示例来源：origin: robovm/robovm

/**
 * Reads a big-endian 64-bit double from the current position in this file. Blocks
 * until eight bytes have been read, the end of the file is reached or an
 * exception is thrown.
 *
 * @return the next double value from this file.
 * @throws EOFException
 *             if the end of this file is detected.
 * @throws IOException
 *             if this file is closed or another I/O error occurs.
 * @see #writeDouble(double)
 */
public final double readDouble() throws IOException {
  return Double.longBitsToDouble(readLong());
}

代码示例来源：origin: marytts/marytts

/**
 * Constructor which reads a datagram from a random access file.
 * 
 * @param raf
 *            the random access file to read the datagram from.
 * 
 * @throws IOException
 *             if there is a problem initialising the datagram from the file
 */
public Datagram(RandomAccessFile raf) throws IOException {
  duration = raf.readLong();
  if (duration < 0) {
    throw new IOException("Can't create a datagram with a negative duration [" + duration + "].");
  }
  int len = raf.readInt();
  if (len < 0) {
    throw new IOException("Can't create a datagram with a negative data size [" + len + "].");
  }
  data = new byte[len];
  raf.readFully(data);
}

代码示例来源：origin: marytts/marytts

/**
 * Constructor which reads a datagram from a random access file.
 * 
 * @param raf
 *            the random access file to read the datagram from.
 * 
 * @throws IOException
 *             if there is a problem initialising the datagram from the file
 */
public Datagram(RandomAccessFile raf) throws IOException {
  duration = raf.readLong();
  if (duration < 0) {
    throw new IOException("Can't create a datagram with a negative duration [" + duration + "].");
  }
  int len = raf.readInt();
  if (len < 0) {
    throw new IOException("Can't create a datagram with a negative data size [" + len + "].");
  }
  data = new byte[len];
  raf.readFully(data);
}

代码示例来源：origin: graphhopper/graphhopper

protected long readHeader(RandomAccessFile raFile) throws IOException {
  raFile.seek(0);
  if (raFile.length() == 0)
    return -1;
  String versionHint = raFile.readUTF();
  if (!"GH".equals(versionHint))
    throw new IllegalArgumentException("Not a GraphHopper file! Expected 'GH' as file marker but was " + versionHint);
  long bytes = raFile.readLong();
  setSegmentSize(raFile.readInt());
  for (int i = 0; i < header.length; i++) {
    header[i] = raFile.readInt();
  }
  return bytes;
}

代码示例来源：origin: lealone/Lealone

private synchronized int readLastChunkId() throws IOException {
  if (chunkMetaData.length() <= 0)
    return 0;
  int lastChunkId = chunkMetaData.readInt();
  int removedPagesCount = chunkMetaData.readInt();
  for (int i = 0; i < removedPagesCount; i++)
    removedPages.add(chunkMetaData.readLong());
  int hashCodeToHostIdMapSize = chunkMetaData.readInt();
  for (int i = 0; i < hashCodeToHostIdMapSize; i++)
    addHostIds(chunkMetaData.readUTF());
  return lastChunkId;
}

代码示例来源：origin: jenkinsci/jenkins

if (adjust((int)pstatus.readLong()) != pid)
    throw new IOException("pstatus PID mismatch"); // sanity check
  ppid = adjust((int)pstatus.readLong()); // AIX pids are stored as a 64 bit integer, 
  if (adjust((int)psinfo.readLong()) != pid)
    throw new IOException("psinfo PID mismatch"); // sanity check
  if (adjust((int)psinfo.readLong()) != ppid)
    throw new IOException("psinfo PPID mismatch"); // sanity check
  pr_argp = adjustL(psinfo.readLong());
  pr_envp = adjustL(psinfo.readLong());
} finally {
  psinfo.close();

代码示例来源：origin: atomix/atomix

@Override
public long readLong(int offset) {
 checkRead(offset, LONG);
 try {
  seekToOffset(offset);
  return randomAccessFile.readLong();
 } catch (IOException e) {
  throw new RuntimeException(e);
 }
}

代码示例来源：origin: lealone/Lealone

private synchronized TreeSet<Long> readRemovedPages() {
  try {
    TreeSet<Long> removedPages = new TreeSet<>();
    if (chunkMetaData.length() > 8) {
      chunkMetaData.seek(4);
      int removedPagesCount = chunkMetaData.readInt();
      for (int i = 0; i < removedPagesCount; i++)
        removedPages.add(chunkMetaData.readLong());
    }
    return removedPages;
  } catch (IOException e) {
    throw panic(DataUtils.newIllegalStateException(DataUtils.ERROR_READING_FAILED, "Failed to readRemovedPages",
        e));
  }
}

代码示例来源：origin: marytts/marytts

/**
 * Constructor which pops a datagram from a random access file.
 * 
 * @param raf
 *            the random access file to pop the datagram from.
 * @param noiseModel
 *            the noise model
 * @throws IOException
 *             IOException
 * @throws EOFException
 *             EOFException
 */
public HnmDatagram(RandomAccessFile raf, int noiseModel) throws IOException, EOFException {
  super(raf.readLong()); // duration
  int len = raf.readInt();
  if (len < 0) {
    throw new IOException("Can't create a datagram with a negative data size [" + len + "].");
  }
  if (len < 4 * 3) {
    throw new IOException("Hnm with waveform noise datagram too short (len=" + len
        + "): cannot be shorter than the space needed for first three Hnm parameters (4*3)");
  }
  // For speed concerns, read into a byte[] first:
  byte[] buf = new byte[len];
  raf.readFully(buf);
  DataInputStream dis = new DataInputStream(new ByteArrayInputStream(buf));
  frame = new HntmSpeechFrame(dis, noiseModel);
}

代码示例来源：origin: apache/flume

SequentialReader(File file) throws EOFException, IOException {
 super(file, null);
 RandomAccessFile fileHandle = getFileHandle();
 int version = fileHandle.readInt();
 if (version != getVersion()) {
  throw new IOException("Version is " + Integer.toHexString(version) +
    " expected " + Integer.toHexString(getVersion())
    + " file: " + file.getCanonicalPath());
 }
 setLogFileID(fileHandle.readInt());
 setLastCheckpointPosition(fileHandle.readLong());
 setLastCheckpointWriteOrderID(fileHandle.readLong());
}

代码示例来源：origin: jenkinsci/jenkins

psinfo.seek(236);  // offset of pr_argc
  argc = adjust(psinfo.readInt());
  argp = adjustL(psinfo.readLong());
  envp = adjustL(psinfo.readLong());
  b64 = (psinfo.readByte() == PR_MODEL_LP64);
} else {

代码示例来源：origin: marytts/marytts

/**
 * Constructor which pops a datagram from a random access file.
 * 
 * @param raf
 *            the random access file to pop the datagram from.
 * @param noiseModel
 *            the noise model
 * @throws IOException
 *             IOException
 * @throws EOFException
 *             EOFException
 */
public HnmDatagram(RandomAccessFile raf, int noiseModel) throws IOException, EOFException {
  super(raf.readLong()); // duration
  int len = raf.readInt();
  if (len < 0) {
    throw new IOException("Can't create a datagram with a negative data size [" + len + "].");
  }
  if (len < 4 * 3) {
    throw new IOException("Hnm with waveform noise datagram too short (len=" + len
        + "): cannot be shorter than the space needed for first three Hnm parameters (4*3)");
  }
  // For speed concerns, read into a byte[] first:
  byte[] buf = new byte[len];
  raf.readFully(buf);
  DataInputStream dis = new DataInputStream(new ByteArrayInputStream(buf));
  frame = new HntmSpeechFrame(dis, noiseModel);
}

代码示例来源：origin: apache/activemq

@Override
public long readLong() throws IOException {
  try {
    return getRaf().readLong();
  } catch (IOException ioe) {
    handleException();
    throw ioe;
  }
}

代码示例来源：origin: oracle/opengrok

public FNode(RandomAccessFile f) throws Throwable {
  offset = f.getFilePointer();
  hash = f.readLong();
  childOffset = f.readUnsignedShort();
  numChildren = f.readUnsignedShort();
  tagOffset = f.readUnsignedShort();
}

代码示例来源：origin: oracle/opengrok

public FNode() throws IOException {
  offset = f.getFilePointer();
  try {
    hash = f.readLong();
    childOffset = f.readUnsignedShort();
    numChildren = f.readUnsignedShort();
    tagOffset = f.readUnsignedShort();
  } catch (EOFException e) {
    numChildren = 0;
    tagOffset = 0;
  }
}

代码示例来源：origin: aragozin/jvm-tools

LongBuffer revertBuffer() throws IOException {
  LongBuffer reverted = new LongBuffer(buffer.length);
  if (bufferSize < buffer.length) {
    for (int i=0;i<bufferSize;i++) {
      reverted.writeLong(buffer[bufferSize - 1 - i]);
    }
  } else {
    writeStream.flush();
    RandomAccessFile raf = new RandomAccessFile(backingFile,"r");
    long offset = raf.length();
    while(offset > 0) {
      offset-=8;
      raf.seek(offset);
      reverted.writeLong(raf.readLong());
    }
  }
  reverted.startReading();
  return reverted;
}

代码示例来源：origin: oracle/opengrok

private FNode binarySearch(long start, int len, long hash) throws IOException {
  int b = 0;
  int e = len;
  while (b <= e) {
    int m = (b + e) / 2;
    f.seek(start + m * EftarFile.RECORD_LENGTH);
    long mhash = f.readLong();
    if (hash > mhash) {
      b = m + 1;
    } else if (hash < mhash) {
      e = m - 1;
    } else {
      return new FNode(mhash, f.getFilePointer() - 8l, f.readUnsignedShort(), f.readUnsignedShort(), f.readUnsignedShort());
    }
  }
  return null;
}

代码示例来源：origin: oracle/opengrok

private FNode sbinSearch(long start, int len, long hash, RandomAccessFile f) throws Throwable {
    int b = 0;
    int e = len;
    while (b <= e) {
      int m = (b + e) / 2;
      f.seek(start + m * RECORD_LENGTH);
      long mhash = f.readLong();
      if (hash > mhash) {
        b = m + 1;
      } else if (hash < mhash) {
        e = m - 1;
      } else {
        return new FNode(mhash, f.getFilePointer() - 8l, f.readUnsignedShort(), f.readUnsignedShort(), f.readUnsignedShort());
      }
    }
    return null;
  }
}

代码示例来源：origin: apache/flume

protected MetaDataWriter(File file, int logFileID) throws IOException {
 super(file, logFileID);
 boolean error = true;
 try {
  RandomAccessFile writeFileHandle = getFileHandle();
  int version = writeFileHandle.readInt();
  if (version != getVersion()) {
   throw new IOException("The version of log file: "
     + file.getCanonicalPath() + " is different from expected "
     + " version: expected = " + getVersion() + ", found = " + version);
  }
  int fid = writeFileHandle.readInt();
  if (fid != logFileID) {
   throw new IOException("The file id of log file: "
     + file.getCanonicalPath() + " is different from expected "
     + " id: expected = " + logFileID + ", found = " + fid);
  }
  setLastCheckpointOffset(writeFileHandle.readLong());
  setLastCheckpointWriteOrderID(writeFileHandle.readLong());
  LOGGER.info("File: " + file.getCanonicalPath() + " was last checkpointed "
    + "at position: " + getLastCheckpointOffset()
    + ", logWriteOrderID: " + getLastCheckpointWriteOrderID());
  error = false;
 } finally {
  if (error) {
   close();
  }
 }
}

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