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//========================================================================
//$Id: EndPoint.java,v 1.1 2005/10/05 14:09:25 janb Exp $
//Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at 
//http://www.apache.org/licenses/LICENSE-2.0
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//========================================================================

package org.mortbay.io;

import java.io.IOException;



/**
 * @author gregw
 * A transport EndPoint
 */
public interface EndPoint
{
    
    /**
     * Close any backing stream associated with the buffer
     */
    void close() throws IOException;

    /**
     * Fill the buffer from the current putIndex to it's capacity from whatever 
     * byte source is backing the buffer. The putIndex is increased if bytes filled.
     * The buffer may chose to do a compact before filling.
     * @return an int value indicating the number of bytes 
     * filled or -1 if EOF is reached.
     */
    int fill(Buffer buffer) throws IOException;
    

    /**
     * Flush the buffer from the current getIndex to it's putIndex using whatever byte
     * sink is backing the buffer. The getIndex is updated with the number of bytes flushed.
     * Any mark set is cleared.
     * If the entire contents of the buffer are flushed, then an implicit empty() is done.
     * 
     * @param buffer The buffer to flush. This buffers getIndex is updated.
     * @return  the number of bytes written
     */
    int flush(Buffer buffer) throws IOException;

    /**
     * Flush the buffer from the current getIndex to it's putIndex using whatever byte
     * sink is backing the buffer. The getIndex is updated with the number of bytes flushed.
     * Any mark set is cleared.
     * If the entire contents of the buffer are flushed, then an implicit empty() is done.
     * The passed header/trailer buffers are written before/after the contents of this buffer. This may be done 
     * either as gather writes, as a poke into this buffer or as several writes. The implementation is free to
     * select the optimal mechanism.
     * @param header A buffer to write before flushing this buffer. This buffers getIndex is updated.
     * @param buffer The buffer to flush. This buffers getIndex is updated.
     * @param trailer A buffer to write after flushing this buffer. This buffers getIndex is updated.
     * @return the total number of bytes written.
     */
    int flush(Buffer header, Buffer buffer, Buffer trailer) throws IOException;

    
    /* ------------------------------------------------------------ */
    /**
     * @return The local IP address to which this EndPoint is bound, or null
     * if this EndPoint does not represent a network connection.
     */
    public String getLocalAddr();
    
    /* ------------------------------------------------------------ */
    /**
     * @return The local host name to which this EndPoint is bound, or null
     * if this EndPoint does not represent a network connection.
     */
    public String getLocalHost();

    /* ------------------------------------------------------------ */
    /**
     * @return The local port number on which this EndPoint is listening, or 0
     * if this EndPoint does not represent a network connection.
     */
    public int getLocalPort();

    /* ------------------------------------------------------------ */
    /**
     * @return The remote IP address to which this EndPoint is connected, or null
     * if this EndPoint does not represent a network connection.
     */
    public String getRemoteAddr();

    /* ------------------------------------------------------------ */
    /**
     * @return The host name of the remote machine to which this EndPoint is connected, or null
     * if this EndPoint does not represent a network connection.
     */
    public String getRemoteHost();

    /* ------------------------------------------------------------ */
    /**
     * @return The remote port number to which this EndPoint is connected, or 0
     * if this EndPoint does not represent a network connection.
     */
    public int getRemotePort();


    /* ------------------------------------------------------------ */
    public boolean isBlocking();
    
    /* ------------------------------------------------------------ */
    public boolean isBufferred();
    
    /* ------------------------------------------------------------ */
    public boolean blockReadable(long millisecs) throws IOException;

    /* ------------------------------------------------------------ */
    public boolean blockWritable(long millisecs) throws IOException;

    /* ------------------------------------------------------------ */
    public boolean isOpen();

    /* ------------------------------------------------------------ */
    /**
     * @return The underlying transport object (socket, channel, etc.)
     */
    public Object getTransport();
    
    /* ------------------------------------------------------------ */
    /**
     * @return True if the endpoint has some buffered input data
     */
    public boolean isBufferingInput();
    
    /* ------------------------------------------------------------ */
    /**
     * @return True if the endpoint has some buffered output data
     */
    public boolean isBufferingOutput();
    
    /* ------------------------------------------------------------ */
    /** Flush any buffered output.
     * May fail to write all data if endpoint is non-blocking
     * @throws IOException 
     */
    public void flush() throws IOException;
    
}