Class RecordParser

  • All Implemented Interfaces:
    Handler<Buffer>, ReadStream<Buffer>, StreamBase

    public class RecordParser
    extends Object
    implements ReadStream<Buffer>, Handler<Buffer>
    A helper class which allows you to easily parse protocols which are delimited by a sequence of bytes, or fixed size records.

    Instances of this class take as input Buffer instances containing raw bytes, and output records.

    For example, if I had a simple ASCII text protocol delimited by '\n' and the input was the following:

     buffer1:HELLO\nHOW ARE Y
     buffer2:OU?\nI AM
     buffer3: DOING OK
     buffer4:\n
     
    Then the output would be:

     buffer1:HELLO
     buffer2:HOW ARE YOU?
     buffer3:I AM DOING OK
     
    Instances of this class can be changed between delimited mode and fixed size record mode on the fly as individual records are read, this allows you to parse protocols where, for example, the first 5 records might all be fixed size (of potentially different sizes), followed by some delimited records, followed by more fixed size records.

    Instances of this class can't currently be used for protocols where the text is encoded with something other than a 1-1 byte-char mapping.

    Please see the documentation for more information.

    NOTE: This class has been automatically generated from the original non RX-ified interface using Vert.x codegen.

    • Field Detail

      • __TYPE_ARG

        public static final io.vertx.lang.rx.TypeArg<RecordParser> __TYPE_ARG
    • Constructor Detail

      • RecordParser

        public RecordParser​(RecordParser delegate)
      • RecordParser

        public RecordParser​(Object delegate)
    • Method Detail

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class Object
      • pipe

        public Pipe<Buffer> pipe()
        Pause this stream and return a to transfer the elements of this stream to a destination .

        The stream will be resumed when the pipe will be wired to a WriteStream.

        Specified by:
        pipe in interface ReadStream<Buffer>
        Returns:
        a pipe
      • pipeTo

        public Completable pipeTo​(WriteStream<Buffer> dst)
        Pipe this ReadStream to the WriteStream.

        Elements emitted by this stream will be written to the write stream until this stream ends or fails.

        Specified by:
        pipeTo in interface ReadStream<Buffer>
        Parameters:
        dst - the destination write stream
        Returns:
        a future notified when the write stream will be ended with the outcome
      • rxPipeTo

        public Completable rxPipeTo​(WriteStream<Buffer> dst)
        Pipe this ReadStream to the WriteStream.

        Elements emitted by this stream will be written to the write stream until this stream ends or fails.

        Specified by:
        rxPipeTo in interface ReadStream<Buffer>
        Parameters:
        dst - the destination write stream
        Returns:
        a future notified when the write stream will be ended with the outcome
      • newDelimited

        public static RecordParser newDelimited​(String delim)
        Create a new RecordParser instance, initially in delimited mode, and where the delimiter can be represented by the String delim endcoded in latin-1 . Don't use this if your String contains other than latin-1 characters.

        output Will receive whole records which have been parsed.

        Parameters:
        delim - the initial delimiter string
        Returns:
      • newDelimited

        public static RecordParser newDelimited​(Buffer delim)
        Create a new RecordParser instance, initially in delimited mode, and where the delimiter can be represented by the Buffer delim.

        Parameters:
        delim - the initial delimiter buffer
        Returns:
      • newFixed

        public static RecordParser newFixed​(int size)
        Create a new RecordParser instance, initially in fixed size mode, and where the record size is specified by the size parameter.

        output Will receive whole records which have been parsed.

        Parameters:
        size - the initial record size
        Returns:
      • newFixed

        public static RecordParser newFixed​(int size,
                                            Handler<Buffer> output)
        Like newFixed(int) but set the output that will receive whole records which have been parsed.
        Parameters:
        size - the initial record size
        output - handler that will receive the output
        Returns:
      • delimitedMode

        public void delimitedMode​(String delim)
        Flip the parser into delimited mode, and where the delimiter can be represented by the String delim encoded in latin-1 . Don't use this if your String contains other than latin-1 characters.

        This method can be called multiple times with different values of delim while data is being parsed.

        Parameters:
        delim - the new delimeter
      • delimitedMode

        public void delimitedMode​(Buffer delim)
        Flip the parser into delimited mode, and where the delimiter can be represented by the delimiter delim.

        This method can be called multiple times with different values of delim while data is being parsed.

        Parameters:
        delim - the new delimiter
      • fixedSizeMode

        public void fixedSizeMode​(int size)
        Flip the parser into fixed size mode, where the record size is specified by size in bytes.

        This method can be called multiple times with different values of size while data is being parsed.

        Parameters:
        size - the new record size
      • maxRecordSize

        public RecordParser maxRecordSize​(int size)
        Set the maximum allowed size for a record when using the delimited mode. The delimiter itself does not count for the record size.

        If a record is longer than specified, an IllegalStateException will be thrown.

        Parameters:
        size - the maximum record size
        Returns:
        a reference to this, so the API can be used fluently
      • handle

        public void handle​(Buffer buffer)
        This method is called to provide the parser with data.
        Specified by:
        handle in interface Handler<Buffer>
        Parameters:
        buffer - a chunk of data
      • handler

        public RecordParser handler​(Handler<Buffer> handler)
        Description copied from interface: ReadStream
        Set a data handler. As data is read, the handler will be called with the data.
        Specified by:
        handler in interface ReadStream<Buffer>
        Returns:
        a reference to this, so the API can be used fluently
      • pause

        public RecordParser pause()
        Description copied from interface: ReadStream
        Pause the ReadStream, it sets the buffer in fetch mode and clears the actual demand.

        While it's paused, no data will be sent to the data handler.

        Specified by:
        pause in interface ReadStream<Buffer>
        Returns:
        a reference to this, so the API can be used fluently
      • fetch

        public RecordParser fetch​(long amount)
        Description copied from interface: ReadStream
        Fetch the specified amount of elements. If the ReadStream has been paused, reading will recommence with the specified amount of items, otherwise the specified amount will be added to the current stream demand.
        Specified by:
        fetch in interface ReadStream<Buffer>
        Returns:
        a reference to this, so the API can be used fluently
      • resume

        public RecordParser resume()
        Description copied from interface: ReadStream
        Resume reading, and sets the buffer in flowing mode.

        If the ReadStream has been paused, reading will recommence on it.

        Specified by:
        resume in interface ReadStream<Buffer>
        Returns:
        a reference to this, so the API can be used fluently
      • endHandler

        public RecordParser endHandler​(Handler<Void> endHandler)
        Description copied from interface: ReadStream
        Set an end handler. Once the stream has ended, and there is no more data to be read, this handler will be called.
        Specified by:
        endHandler in interface ReadStream<Buffer>
        Returns:
        a reference to this, so the API can be used fluently