NonshareableDoubleBufferedDataInputStream

java.lang.Object
- java.io.InputStream
- - java.io.FilterInputStream
  - - org.ka2ddo.util.NonshareableDoubleBufferedDataInputStream

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.lang.AutoCloseable, java.lang.Runnable
```
public final class NonshareableDoubleBufferedDataInputStream
extends java.io.FilterInputStream
implements java.io.DataInput, java.lang.Runnable
```
This class is (sort of) a merged copy of java.io.BufferedInputStream and java.io.DataInputStream, but without the synchronization, which restricts instances of this class to use in a single thread. Note that, because of certain optimizations performed in this code, the user should either use a buffer size greater than 65536 or ensure that all strings read with the readUTF() method are shorter than the buffer size. This must be used on a dedicated FileInputStream, as it uses a separate Thread from an Executor pool to read into the first buffer so the second buffer can be drained simultaneously.

Author:

Andrew Pavlin, KA2DDO

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static interface`	`NonshareableDoubleBufferedDataInputStream.FileClosedListener` This interface allows a handler to be informed when end-of-file is detected by the file-reading thread (typically so the next file can be opened and first buffer loaded before the data consumer finishes consuming this stream).

Field Summary
- Fields inherited from class java.io.FilterInputStream
  in

Constructor Summary

Constructors
Constructor and Description
`NonshareableDoubleBufferedDataInputStream(java.io.InputStream in)` Creates a `NonshareableDoubleBufferedDataInputStream` and saves its argument, the input stream `in`, for later use.
`NonshareableDoubleBufferedDataInputStream(java.io.InputStream in, byte[] buf1, byte[] buf2)` Creates a `NonshareableDoubleBufferedDataInputStream` with the specified buffer size, and saves its argument, the input stream `in`, for later use.
`NonshareableDoubleBufferedDataInputStream(java.io.InputStream in, byte[] buf1, byte[] buf2, NonshareableDoubleBufferedDataInputStream.FileClosedListener listener, java.lang.Object context)` Creates a `NonshareableDoubleBufferedDataInputStream` with the specified buffer size, and saves its argument, the input stream `in`, for later use.
`NonshareableDoubleBufferedDataInputStream(java.io.InputStream in, int size)` Creates a `NonshareableDoubleBufferedDataInputStream` with the specified buffer size, and saves its argument, the input stream `in`, for later use.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`available()` Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.
`void`	`close()` Closes this input stream and releases any system resources associated with the stream.
`long`	`getByteCount()` Get the total number of bytes read through this stream (so far).
`int`	`getNumBufNotReady()` Report the number of times the file-reading thread had not provided sufficient data for the data-consuming thread when it wanted more data.
`int`	`getSeqNum()` Get the identifying sequence number of this instance of `NonshareableDoubleBufferedDataInputStream`.
`long`	`getTimeWaitingForBuf()` Return the total amount of time (in milliseconds) that the data-consuming thread had to wait because the file-reading thread wasn't fast enough.
`boolean`	`isEof()` Test if this stream's file-reading thread has reached end-of-file of the underlying stream.
`void`	`mark(int readlimit)` See the general contract of the `mark` method of `InputStream`.
`boolean`	`markSupported()` Tests if this input stream supports the `mark` and `reset` methods.
`int`	`read()` See the general contract of the `read` method of `InputStream`.
`int`	`read(byte[] b)` Reads some number of bytes from the contained input stream and stores them into the buffer array `b`.
`int`	`read(byte[] b, int off, int len)` Reads bytes from this byte-input stream into the specified byte array, starting at the given offset.
`boolean`	`readBoolean()` See the general contract of the `readBoolean` method of `DataInput`.
`byte`	`readByte()` See the general contract of the `readByte` method of `DataInput`.
`char`	`readChar()` See the general contract of the `readChar` method of `DataInput`.
`double`	`readDouble()` See the general contract of the `readDouble` method of `DataInput`.
`float`	`readFloat()` See the general contract of the `readFloat` method of `DataInput`.
`void`	`readFully(byte[] b)` See the general contract of the `readFully` method of `DataInput`.
`void`	`readFully(byte[] b, int off, int len)` See the general contract of the `readFully` method of `DataInput`.
`int`	`readInt()` See the general contract of the `readInt` method of `DataInput`.
`java.lang.String`	`readLine()` See the general contract of the `readLine` method of `DataInput`.
`int`	`readLittleEndianInt()` See the general contract of the `readInt` method of `DataInput`, except this reads the bytes in little-endian order rather than big-endian (network) byte order.
`short`	`readLittleEndianShort()` See the general contract of the `readShort` method of `DataInput`.
`long`	`readLong()` See the general contract of the `readLong` method of `DataInput`.
`short`	`readShort()` See the general contract of the `readShort` method of `DataInput`.
`int`	`readUnsignedByte()` See the general contract of the `readUnsignedByte` method of `DataInput`.
`int`	`readUnsignedShort()` See the general contract of the `readUnsignedShort` method of `DataInput`.
`java.lang.String`	`readUTF()` See the general contract of the `readUTF` method of `DataInput`.
`java.lang.String`	`readUTF8Line()` This method reads a line of text encoded in UTF-8, terminated by a line ending (CR, LF, or CRLF) or EOF.
`char`	`readUTFChar()` This method reads one UTF-8 encoded character from the input stream, using as many bytes as necessary to get an entire character.
`void`	`reset()` See the general contract of the `reset` method of `InputStream`.
`void`	`run()` DO NOT CALL.
`void`	`setFileClosedListener(NonshareableDoubleBufferedDataInputStream.FileClosedListener l, java.lang.Object context)` Register (or update the registered listener if called more than once) to be informed when this file is closed.
`long`	`skip(long n)` See the general contract of the `skip` method of `InputStream`.
`int`	`skipBytes(int n)` See the general contract of the `skipBytes` method of `DataInput`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - NonshareableDoubleBufferedDataInputStream
```
public NonshareableDoubleBufferedDataInputStream(java.io.InputStream in)
```
    Creates a NonshareableDoubleBufferedDataInputStream and saves its argument, the input stream in, for later use. An internal buffer array is created and stored in buf.
    
    Parameters:
    
    in - the underlying input stream.
  - NonshareableDoubleBufferedDataInputStream
```
public NonshareableDoubleBufferedDataInputStream(java.io.InputStream in,
                                                 int size)
```
    Creates a NonshareableDoubleBufferedDataInputStream with the specified buffer size, and saves its argument, the input stream in, for later use. An internal buffer array of length size is created and stored in buf.
    
    Parameters:
    
    in - the underlying input stream.
    
    size - the buffer size (minimum size 8 bytes).
    
    Throws:
    
    java.lang.IllegalArgumentException - if size < 8.
  - NonshareableDoubleBufferedDataInputStream
```
public NonshareableDoubleBufferedDataInputStream(java.io.InputStream in,
                                                 byte[] buf1,
                                                 byte[] buf2)
```
    Creates a NonshareableDoubleBufferedDataInputStream with the specified buffer size, and saves its argument, the input stream in, for later use. The specified pair of buffers (which must be the same length) are used for file-reading and data extraction.
    
    Parameters:
    
    in - the underlying input stream.
    
    buf1 - the first ByteBuffer to use for the double-buffered reader
    
    buf2 - the second ByteBuffer to use for the double-buffered reader; must be same capacity as the first one
    
    Throws:
    
    java.lang.IllegalArgumentException - if size < 8.
  - NonshareableDoubleBufferedDataInputStream
```
public NonshareableDoubleBufferedDataInputStream(java.io.InputStream in,
                                                 byte[] buf1,
                                                 byte[] buf2,
                                                 NonshareableDoubleBufferedDataInputStream.FileClosedListener listener,
                                                 java.lang.Object context)
```
    Creates a NonshareableDoubleBufferedDataInputStream with the specified buffer size, and saves its argument, the input stream in, for later use. The specified pair of buffers (which must be the same length) are used for file-reading and data extraction, and registers the callback listener immediately (useful if the file being read is smaller than the buffer size, such that the callback might be called before the constructed object can be called in the thread that called this constructor).
    
    Parameters:
    
    in - the underlying input stream.
    
    buf1 - the first ByteBuffer to use for the double-buffered reader
    
    buf2 - the second ByteBuffer to use for the double-buffered reader; must be same capacity as the first one
    
    listener - FileClosedListener to be notified when file Eof is reached
    
    context - Object to be passed to listener (if there is a listener)
    
    Throws:
    
    java.lang.IllegalArgumentException - if size < 8.
- Method Detail
  - setFileClosedListener
```
public void setFileClosedListener(NonshareableDoubleBufferedDataInputStream.FileClosedListener l,
                                  java.lang.Object context)
```
    Register (or update the registered listener if called more than once) to be informed when this file is closed.
    
    Parameters:
    
    l - FileClosedListener to be notified when file Eof is reached
    
    context - Object to be passed to listener (if there is a listener)
  - run
```
public void run()
```
    DO NOT CALL. Reserved for background buffer filling. This is running (or in a wait state) the entire time the input file is open; the thread is only returned to the executor pool when the file is closed, so the pool needs at least two threads per simultaneously used chains of NonshareableDoubleBufferedDataInputStreams, so that the next stream can get a thread while this stream's thread is still cleaning up.
    
    Specified by:
    
    run in interface java.lang.Runnable
  - read
```
public int read()
         throws java.io.IOException
```
    See the general contract of the read method of InputStream.
    
    Overrides:
    
    read in class java.io.FilterInputStream
    
    Returns:
    
    the next byte of data, or -1 if the end of the stream is reached.
    
    Throws:
    
    java.io.IOException - if this input stream has been closed by invoking its close() method, or an I/O error occurs.
  - read
```
public int read(byte[] b,
                int off,
                int len)
         throws java.io.IOException
```
    Reads bytes from this byte-input stream into the specified byte array, starting at the given offset.
    This method implements the general contract of the corresponding read method of the InputStream class. As an additional convenience, it attempts to read as many bytes as possible by repeatedly invoking the read method of the underlying stream. This iterated read continues until one of the following conditions becomes true:
    - The specified number of bytes have been read,
    - The read method of the underlying stream returns -1, indicating end-of-file, or
    - The available method of the underlying stream returns zero, indicating that further input requests would block.
    If the first read on the underlying stream returns -1 to indicate end-of-file then this method returns -1. Otherwise this method returns the number of bytes actually read.
    Subclasses of this class are encouraged, but not required, to attempt to read as many bytes as possible in the same fashion.
    Overrides:
    
    read in class java.io.FilterInputStream
    
    Parameters:
    
    b - destination buffer.
    
    off - offset at which to start storing bytes.
    
    len - maximum number of bytes to read.
    
    Returns:
    
    the number of bytes read, or -1 if the end of the stream has been reached.
    
    Throws:
    
    java.io.IOException - if this input stream has been closed by invoking its close() method, or an I/O error occurs.
  - skip
```
public long skip(long n)
          throws java.io.IOException
```
    See the general contract of the skip method of InputStream.
    
    Overrides:
    
    skip in class java.io.FilterInputStream
    
    Throws:
    
    java.io.IOException - if the stream does not support seek, or if this input stream has been closed by invoking its close() method, or an I/O error occurs.
  - available
```
public int available()
              throws java.io.IOException
```
    Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.
    This method returns the number of bytes remaining to be read in the buffer (count - pos), possibly refilling the buffer if it was empty at the time of this call. Specifically, it does _not_ try to return the total remaining bytes in the file.
    
    Overrides:
    
    available in class java.io.FilterInputStream
    
    Returns:
    
    an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking.
    
    Throws:
    
    java.io.IOException - if this input stream has been closed by invoking its close() method, or an I/O error occurs.
  - mark
```
public void mark(int readlimit)
```
    See the general contract of the mark method of InputStream.
    
    Overrides:
    
    mark in class java.io.FilterInputStream
    
    Parameters:
    
    readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.
    
    See Also:
    
    reset()
  - reset
```
public void reset()
           throws java.io.IOException
```
    See the general contract of the reset method of InputStream.
    If markpos is -1 (no mark has been set or the mark has been invalidated), an IOException is thrown. Otherwise, pos is set equal to markpos.
    
    Overrides:
    
    reset in class java.io.FilterInputStream
    
    Throws:
    
    java.io.IOException - if this stream has not been marked or, if the mark has been invalidated, or the stream has been closed by invoking its close() method, or an I/O error occurs.
    
    See Also:
    
    mark(int)
  - markSupported
```
public boolean markSupported()
```
    Tests if this input stream supports the mark and reset methods. The markSupported method of NonshareableDoubleBufferedDataInputStream returns false.
    
    Overrides:
    
    markSupported in class java.io.FilterInputStream
    
    Returns:
    
    a boolean indicating if this stream type supports the mark and reset methods.
    
    See Also:
    
    InputStream.mark(int), InputStream.reset()
  - close
```
public void close()
           throws java.io.IOException
```
    Closes this input stream and releases any system resources associated with the stream. Once the stream has been closed, further read(), available(), reset(), or skip() invocations will throw an IOException; however, this class does allow you to read unread data that was buffered prior to the close() call. Closing a previously closed stream has no effect.
    
    Specified by:
    
    close in interface java.io.Closeable
    
    Specified by:
    
    close in interface java.lang.AutoCloseable
    
    Overrides:
    
    close in class java.io.FilterInputStream
    
    Throws:
    
    java.io.IOException - if an I/O error occurs.
  - read
```
public final int read(byte[] b)
               throws java.io.IOException
```
    Reads some number of bytes from the contained input stream and stores them into the buffer array b. The number of bytes actually read is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown.
    If b is null, a NullPointerException is thrown. If the length of b is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.
    The first byte read is stored into element b[0], the next one into b[1], and so on. The number of bytes read is, at most, equal to the length of b. Let k be the number of bytes actually read; these bytes will be stored in elements b[0] through b[k-1], leaving elements b[k] through b[b.length-1] unaffected.
    The read(b) method has the same effect as:
    read(b, 0, b.length)
    Overrides:
    
    read in class java.io.FilterInputStream
    
    Parameters:
    
    b - the buffer into which the data is read.
    
    Returns:
    
    the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.
    
    Throws:
    
    java.io.IOException - if the first byte cannot be read for any reason other than end of file, the stream has been closed and the underlying input stream does not support reading after close, or another I/O error occurs.
    
    See Also:
    
    InputStream.read(byte[], int, int)
  - readFully
```
public final void readFully(byte[] b)
                     throws java.io.IOException
```
    See the general contract of the readFully method of DataInput.
    
    Specified by:
    
    readFully in interface java.io.DataInput
    
    Parameters:
    
    b - the buffer into which the data is read.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading all the bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readFully
```
public final void readFully(byte[] b,
                            int off,
                            int len)
                     throws java.io.IOException
```
    See the general contract of the readFully method of DataInput.
    
    Specified by:
    
    readFully in interface java.io.DataInput
    
    Parameters:
    
    b - the buffer into which the data is read.
    
    off - the start offset of the data.
    
    len - the number of bytes to read.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading all the bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - skipBytes
```
public final int skipBytes(int n)
                    throws java.io.IOException
```
    See the general contract of the skipBytes method of DataInput.
    
    Specified by:
    
    skipBytes in interface java.io.DataInput
    
    Parameters:
    
    n - the number of bytes to be skipped.
    
    Returns:
    
    the actual number of bytes skipped.
    
    Throws:
    
    java.io.IOException - if the contained input stream does not support seek, or the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readBoolean
```
public final boolean readBoolean()
                          throws java.io.IOException
```
    See the general contract of the readBoolean method of DataInput.
    
    Specified by:
    
    readBoolean in interface java.io.DataInput
    
    Returns:
    
    the boolean value read.
    
    Throws:
    
    java.io.EOFException - if this input stream has reached the end.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readByte
```
public final byte readByte()
                    throws java.io.IOException
```
    See the general contract of the readByte method of DataInput.
    
    Specified by:
    
    readByte in interface java.io.DataInput
    
    Returns:
    
    the next byte of this input stream as a signed 8-bit byte.
    
    Throws:
    
    java.io.EOFException - if this input stream has reached the end.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readUnsignedByte
```
public final int readUnsignedByte()
                           throws java.io.IOException
```
    See the general contract of the readUnsignedByte method of DataInput.
    
    Specified by:
    
    readUnsignedByte in interface java.io.DataInput
    
    Returns:
    
    the next byte of this input stream, interpreted as an unsigned 8-bit number.
    
    Throws:
    
    java.io.EOFException - if this input stream has reached the end.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readShort
```
public final short readShort()
                      throws java.io.IOException
```
    See the general contract of the readShort method of DataInput.
    
    Specified by:
    
    readShort in interface java.io.DataInput
    
    Returns:
    
    the next two bytes of this input stream, interpreted as a signed 16-bit number.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading two bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readUnsignedShort
```
public final int readUnsignedShort()
                            throws java.io.IOException
```
    See the general contract of the readUnsignedShort method of DataInput.
    
    Specified by:
    
    readUnsignedShort in interface java.io.DataInput
    
    Returns:
    
    the next two bytes of this input stream, interpreted as an unsigned 16-bit integer.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading two bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readLittleEndianShort
```
public final short readLittleEndianShort()
                                  throws java.io.IOException
```
    See the general contract of the readShort method of DataInput.
    
    Returns:
    
    the next two bytes of this input stream, interpreted as a signed 16-bit number.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading two bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readChar
```
public final char readChar()
                    throws java.io.IOException
```
    See the general contract of the readChar method of DataInput.
    
    Specified by:
    
    readChar in interface java.io.DataInput
    
    Returns:
    
    the next two bytes of this input stream, interpreted as a char.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading two bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readUTFChar
```
public final char readUTFChar()
                       throws java.io.EOFException,
                              java.io.UTFDataFormatException,
                              java.io.IOException
```
    This method reads one UTF-8 encoded character from the input stream, using as many bytes as necessary to get an entire character. Note that this method cannot support Unicode characters represented by the UTF-16 high and low surrogate sequence as decoded from a 4-byte UTF-8 character, as it would require returning 2 Java chars and this method can only return one.
    
    Returns:
    
    the Unicode character corresponding to the one to four bytes read from the input stream.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading an entire UTF-8 character.
    
    java.io.UTFDataFormatException - if the first few bytes in the stream do not represent a valid modified UTF-8 encoding of a Unicode character or the stream ends before the completion of a multi-byte UTF-8 character.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readInt
```
public final int readInt()
                  throws java.io.IOException
```
    See the general contract of the readInt method of DataInput.
    
    Specified by:
    
    readInt in interface java.io.DataInput
    
    Returns:
    
    the next four bytes of this input stream, interpreted as an int.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading four bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readLittleEndianInt
```
public final int readLittleEndianInt()
                              throws java.io.IOException
```
    See the general contract of the readInt method of DataInput, except this reads the bytes in little-endian order rather than big-endian (network) byte order.
    
    Returns:
    
    the next four bytes of this input stream, interpreted as an int.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading four bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readLong
```
public final long readLong()
                    throws java.io.IOException
```
    See the general contract of the readLong method of DataInput.
    
    Specified by:
    
    readLong in interface java.io.DataInput
    
    Returns:
    
    the next eight bytes of this input stream, interpreted as a long.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading eight bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
  - readFloat
```
public final float readFloat()
                      throws java.io.IOException
```
    See the general contract of the readFloat method of DataInput.
    
    Specified by:
    
    readFloat in interface java.io.DataInput
    
    Returns:
    
    the next four bytes of this input stream, interpreted as a float.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading four bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
    
    See Also:
    
    readInt(), Float.intBitsToFloat(int)
  - readDouble
```
public final double readDouble()
                        throws java.io.IOException
```
    See the general contract of the readDouble method of DataInput.
    Bytes for this operation are read from the contained input stream.
    
    Specified by:
    
    readDouble in interface java.io.DataInput
    
    Returns:
    
    the next eight bytes of this input stream, interpreted as a double.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading eight bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
    
    See Also:
    
    readLong(), Double.longBitsToDouble(long)
  - readLine
```
public final java.lang.String readLine()
                                throws java.io.IOException
```
    See the general contract of the readLine method of DataInput.
    Bytes for this operation are read from the contained input stream. Note that this method only supports extended 8-bit ASCII (ISO-8859-1); it does not support UTF-8 or other locale-specific character sets.
    
    Specified by:
    
    readLine in interface java.io.DataInput
    
    Returns:
    
    the next line of text from this input stream.
    
    Throws:
    
    java.io.IOException - if an I/O error occurs.
  - readUTF8Line
```
public final java.lang.String readUTF8Line()
                                    throws java.io.IOException
```
    This method reads a line of text encoded in UTF-8, terminated by a line ending (CR, LF, or CRLF) or EOF.
    Note that this method only supports UTF-8; it does not support other locale-specific character sets.
    
    Returns:
    
    the next line of text from this input stream.
    
    Throws:
    
    java.io.IOException - if an I/O error occurs.
  - readUTF
```
public final java.lang.String readUTF()
                               throws java.io.IOException
```
    See the general contract of the readUTF method of DataInput.
    
    Specified by:
    
    readUTF in interface java.io.DataInput
    
    Returns:
    
    a Unicode string.
    
    Throws:
    
    java.io.EOFException - if this input stream reaches the end before reading all the bytes.
    
    java.io.IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
    
    java.io.UTFDataFormatException - if the bytes do not represent a valid modified UTF-8 encoding of a string.
  - getSeqNum
```
public int getSeqNum()
```
    Get the identifying sequence number of this instance of NonshareableDoubleBufferedDataInputStream.
    
    Returns:
    
    count of how many NonshareableDoubleBufferedDataInputStream were created
  - isEof
```
public boolean isEof()
```
    Test if this stream's file-reading thread has reached end-of-file of the underlying stream. Note that this does not imply that there are no unread buffered bytes left in this stream; getting a -1 from read() will indicate that.
    
    Returns:
    
    booloean true if the underlying stream's end-of-file has been reached
  - getNumBufNotReady
```
public int getNumBufNotReady()
```
    Report the number of times the file-reading thread had not provided sufficient data for the data-consuming thread when it wanted more data.
    
    Returns:
    
    number of times the readXXX methods had to wait (block) for more data
    
    See Also:
    
    getTimeWaitingForBuf()
  - getTimeWaitingForBuf
```
public long getTimeWaitingForBuf()
```
    Return the total amount of time (in milliseconds) that the data-consuming thread had to wait because the file-reading thread wasn't fast enough.
    
    Returns:
    
    total stall time in milliseconds
    
    See Also:
    
    getNumBufNotReady()
  - getByteCount
```
public long getByteCount()
```
    Get the total number of bytes read through this stream (so far).
    
    Returns:
    
    count of bytes read from this stream

Class NonshareableDoubleBufferedDataInputStream

Nested Class Summary

Field Summary

Fields inherited from class java.io.FilterInputStream

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

NonshareableDoubleBufferedDataInputStream

NonshareableDoubleBufferedDataInputStream

NonshareableDoubleBufferedDataInputStream

NonshareableDoubleBufferedDataInputStream

Method Detail

setFileClosedListener

run

read

read

skip

available

mark

reset

markSupported

close

read

readFully

readFully

skipBytes

readBoolean

readByte

readUnsignedByte

readShort

readUnsignedShort

readLittleEndianShort

readChar

readUTFChar

readInt

readLittleEndianInt

readLong

readFloat

readDouble

readLine

readUTF8Line

readUTF

getSeqNum

isEof

getNumBufNotReady

getTimeWaitingForBuf

getByteCount