behavioursidlefilter.java

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务。PlanetSim还可以将仿真代码平稳转换为在Internet上的实验代码

package planet.generic.commonapi.behaviours;

import planet.commonapi.Node;
import planet.commonapi.RouteMessage;
import planet.commonapi.behaviours.BehavioursFilter;
import planet.generic.commonapi.factory.GenericFactory;
import planet.simulate.Logger;

/**
 * IdleFilter class does not filter any RouteMessage.
 * @author <a href="mailto: [e-mail]">Marc Sanchez</a>
 * @author <a href="mailto: [e-mail]">Jordi Pujol</a>
 * 05-jul-2005
 */
public class BehavioursIdleFilter  implements BehavioursFilter { 
    
    /**
     * Empty constructor. Does nothing.
     */
    public BehavioursIdleFilter() {}
    
	/**
	 * Given a RouteMessage and a Node as input, filter's method filters the 
	 * input RouteMessage if does not satisfy filter's precondition. 
	 * @param msg RouteMessage taken as input.
	 * @param node Node taken as input.
	 * @return true when the <b>msg</b> must be filtered. false when
     * this RouteMessage must be processed by the behaviours.
	 */
	public boolean filter(RouteMessage msg, Node node) {
		if (!node.isAlive()) {
			Logger.log("Node " + node.getId() + " is not in, but it receives messages!!", Logger.ERROR_LOG);
			GenericFactory.freeMessage(msg);
			return true;
		}
		
		if (msg.getDestination() == null) {
			Logger.log("destination null", Logger.ERROR_LOG);
			GenericFactory.freeMessage(msg);
			return true;
		}
		return false;
	}
    
	/**
	 * @return Returns the name of the filter. 
	 */
	public String getName() {
		return "BehavioursIdleFilter";
	}
    
	/**
	 * @return Returns a string representation of the filter. In general, the toString
	 * method returns a string that "textually represents" this behaviour. The result should 
	 * be a concise but informative representation that is easy for a person to read. 
	 */ 
	public String toString() {
		return getName();
	}
}