org.apache.http.io
Interface SessionInputBuffer

All Known Implementing Classes:
AbstractSessionInputBuffer, SessionInputBufferImpl, SocketInputBuffer

public interface SessionInputBuffer

Session input buffer for blocking connections. This interface is similar to InputStream class, but it also provides methods for reading lines of text.

Implementing classes are also expected to manage intermediate data buffering for optimal input performance.

Since:
4.0

Method Summary
 HttpTransportMetrics getMetrics()
          Returns HttpTransportMetrics for this session buffer.
 boolean isDataAvailable(int timeout)
          Deprecated. (4.3) do not use. This function should be provided at the connection level
 int read()
          Reads the next byte of data from this session buffer.
 int read(byte[] b)
          Reads some number of bytes from the session buffer and stores them into the buffer array b.
 int read(byte[] b, int off, int len)
          Reads up to len bytes of data from the session buffer into an array of bytes.
 String readLine()
          Reads a complete line of characters up to a line delimiter from this session buffer.
 int readLine(CharArrayBuffer buffer)
          Reads a complete line of characters up to a line delimiter from this session buffer into the given line buffer.
 

Method Detail

read

int read(byte[] b,
         int off,
         int len)
         throws IOException
Reads up to len bytes of data from the session buffer into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read, possibly zero. 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 off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.

Parameters:
b - the buffer into which the data is read.
off - the start offset in array b at which the data is written.
len - the maximum number of bytes to 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:
IOException - if an I/O error occurs.

read

int read(byte[] b)
         throws IOException
Reads some number of bytes from the session buffer 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.

Parameters:
b - the buffer into which the data is read.
Returns:
the total number of bytes read into the buffer, or -1 is there is no more data because the end of the stream has been reached.
Throws:
IOException - if an I/O error occurs.

read

int read()
         throws IOException
Reads the next byte of data from this session buffer. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Returns:
the next byte of data, or -1 if the end of the stream is reached.
Throws:
IOException - if an I/O error occurs.

readLine

int readLine(CharArrayBuffer buffer)
             throws IOException
Reads a complete line of characters up to a line delimiter from this session buffer into the given line buffer. The number of chars actually read is returned as an integer. The line delimiter itself is discarded. If no char is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, end of file is detected, or an exception is thrown.

The choice of a char encoding and line delimiter sequence is up to the specific implementations of this interface.

Parameters:
buffer - the line buffer.
Returns:
one line of characters
Throws:
IOException - if an I/O error occurs.

readLine

String readLine()
                throws IOException
Reads a complete line of characters up to a line delimiter from this session buffer. The line delimiter itself is discarded. If no char is available because the end of the stream has been reached, null is returned. This method blocks until input data is available, end of file is detected, or an exception is thrown.

The choice of a char encoding and line delimiter sequence is up to the specific implementations of this interface.

Returns:
HTTP line as a string
Throws:
IOException - if an I/O error occurs.

isDataAvailable

@Deprecated
boolean isDataAvailable(int timeout)
                        throws IOException
Deprecated. (4.3) do not use. This function should be provided at the connection level

Blocks until some data becomes available in the session buffer or the given timeout period in milliseconds elapses. If the timeout value is 0 this method blocks indefinitely.

Parameters:
timeout - in milliseconds.
Returns:
true if some data is available in the session buffer or false otherwise.
Throws:
IOException - if an I/O error occurs.

getMetrics

HttpTransportMetrics getMetrics()
Returns HttpTransportMetrics for this session buffer.

Returns:
transport metrics.


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