package com.limegroup.gnutella;

import java.net.InetAddress;

import org.apache.http.protocol.HttpRequestHandler;

import com.limegroup.gnutella.library.FileDesc;

/**
 * Defines the requirements for classes that manage Gnutella uploads. 
 */
public interface UploadManager extends BandwidthTracker {
    
    /**
     * Return the last value that was measured by
     * {@link BandwidthTracker#getMeasuredBandwidth()}.
     *
     * @return bandwidth in KB / s
     */
    float getLastMeasuredBandwidth();
    
    /**
     * Returns the number of queued uploads.
     */
    int getNumQueuedUploads();
    
    /**
     * Returns the number of uploads excluding forced uploads. 
     */
    int uploadsInProgress();
	
	/**
     * Returns true if this has ever successfully uploaded a file during this
     * session.
     * <p>
     * This method was added to adopt more of the BearShare QHD standard.
	 */
    boolean hadSuccesfulUpload();
	
	/**
     * Returns true if any uploader is conneected to <code>addr</code>.  
	 */
    boolean isConnectedTo(InetAddress addr);

	/**
     * Returns whether or not an upload request can be serviced immediately. In
     * particular, if there are more available upload slots than queued uploads
     * this will return true.
	 */
    boolean isServiceable();
	
    /**
     * Stops all uploads that are uploading <code>fd</code>.
     */
    boolean killUploadsForFileDesc(FileDesc fd);

	/**
     * Returns if an incoming query (not actual upload request) may be
     * serviceable.
	 */
    boolean mayBeServiceable();
	
	/**
     * Returns the estimated upload speed in <b>KILOBITS/s</b> [sic] of the
     *  next transfer, assuming the client (i.e., downloader) has infinite
     */
    int measuredUploadSpeed();
  		
	/**
     * Registers {@link HttpRequestHandler}s with <code>acceptor</code>.
	 */
    void start();
        
	/**
     * Deregisters {@link HttpRequestHandler}s with <code>acceptor</code>.
	 */
    void stop();
    
}