neighbourmessagepool.java

来自「p2p仿真器。开发者可以工作在覆盖层中进行创造和测试逻辑算法或者创建和测试新的服」· Java 代码 · 共 77 行

package planet.symphony.messages;

import java.util.Stack;

/**
 * The purpose of this pool is to save the memory used on the simulation, for 
 * the intensive communication with NeighbourMessages.
 * @author <a href="mailto: [e-mail]">Jordi Pujol</a>
 * 21-jun-2005
 */
public class NeighbourMessagePool {
    
    /** The pool of NeighbourMessage is based on a stack. */
    private static Stack pool = null;
    /** A temporal NeighbourMessage for internal uses. */
    private static NeighbourMessage temp = null;
    /** Number of created NeighbourMessages. */
    public static int createdMessages;
    /** Number of reused NeighbourMessages. */
    public static int reusedMessages;
    /** Number of free NeighbourMessages. */
    public static int freeMessages;
    
    /**
     * Initializes the pool of NeighbourMessages.
     */
    public static void init()
    {
        pool = new Stack();
        createdMessages = 0;
        reusedMessages = 0;
        freeMessages = 0;
    }
    
    /**
     * Returns an existing NeighbourMessage if exists or a new NeighbourMessage.
     * @return An existing or a new NeighbourMessage.
     */
    public static NeighbourMessage getMessage()
    {
        if (pool.size()>0)
        {
            reusedMessages++;
            return (NeighbourMessage)pool.pop();
        }
        else
        {
            createdMessages++;
            return new NeighbourMessage();
        }
    }
    
    /**
     * Returns an existing or a new NeighbourMessage with the specified internal value.
     * @param value The internal value for the NeighbourMessage.
     * @return An existing or a new NeighbourMessage with the specified internal value.
     */
    public static NeighbourMessage getMessage(java.util.Collection value)
    {
        temp = getMessage();
        temp.neighbourhoodSet = value;
        return temp;
    }
    
    /**
     * Free the unused NeighbourMessage <b>msg</b>
     * @param msg An unused NeighbourMessage.
     */
    public static void freeMessage(NeighbourMessage msg)
    {
        freeMessages++;
        msg.neighbourhoodSet = null;
        pool.push(msg);
    }

}