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package org.apache.http.io;

import java.io.IOException;

import org.apache.http.util.CharArrayBuffer;

/**
 * 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 */ public interface SessionInputBuffer { /** * Reads up to {@code len} bytes of data from the session buffer into * an array of bytes. An attempt is made to read as many as * {@code 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 {@code off} is negative, or {@code len} is negative, or * {@code off+len} is greater than the length of the array * {@code b}, then an {@code IndexOutOfBoundsException} is * thrown. * * @param b the buffer into which the data is read. * @param off the start offset in array {@code b} * at which the data is written. * @param len the maximum number of bytes to read. * @return the total number of bytes read into the buffer, or * {@code -1} if there is no more data because the end of * the stream has been reached. * @throws IOException if an I/O error occurs. */ int read(byte[] b, int off, int len) throws IOException; /** * Reads some number of bytes from the session buffer and stores them into * the buffer array {@code 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. * * @param b the buffer into which the data is read. * @return the total number of bytes read into the buffer, or * {@code -1} is there is no more data because the end of * the stream has been reached. * @throws IOException if an I/O error occurs. */ int read(byte[] b) throws IOException; /** * Reads the next byte of data from this session buffer. The value byte is * returned as an {@code int} in the range {@code 0} to * {@code 255}. If no byte is available because the end of the stream * has been reached, the value {@code -1} is returned. This method * blocks until input data is available, the end of the stream is detected, * or an exception is thrown. * * @return the next byte of data, or {@code -1} if the end of the * stream is reached. * @throws IOException if an I/O error occurs. */ int read() 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 {@code -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. * * @param buffer the line buffer. * @return one line of characters * @throws IOException if an I/O error occurs. */ int readLine(CharArrayBuffer buffer) 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, * {@code 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. * * @return HTTP line as a string * @throws IOException if an I/O error occurs. */ String readLine() throws IOException; /** Blocks until some data becomes available in the session buffer or the * given timeout period in milliseconds elapses. If the timeout value is * {@code 0} this method blocks indefinitely. * * @param timeout in milliseconds. * @return {@code true} if some data is available in the session * buffer or {@code false} otherwise. * @throws IOException if an I/O error occurs. * * @deprecated (4.3) do not use. This function should be provided at the * connection level */ @Deprecated boolean isDataAvailable(int timeout) throws IOException; /** * Returns {@link HttpTransportMetrics} for this session buffer. * * @return transport metrics. */ HttpTransportMetrics getMetrics(); }





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