ONE有2个模式： GUI 和 TextUI。我们只讨论文本模式 TextUI。三者之间有继承关系。模式和参数指定 通过main函数参数指定。

类DTNSimUI 有成员： 类 World; Vector reports; 类SimScenario.
类SimScenario有成员： List hosts;

文本模式 从 DTNSimTextUI.start() 即 DTNSimUI.start() 启动；
文本有两大流程 （1）DTNSimUI.initModel(); （2） DTNSimUI.runSim(); 即 DTNSimTextUI.runSim();
首先，Settings.init() 通过读取配置文件,再由 Properties 实现（Java的Properties机制）; 类Properties 的 Properties.load();
之后进行两大流程

* 

1. DTNSimUI.initModel(); 初始化过程

Init过程 的 总体流程如下：

1.1 new Settings(); 之前已经通过 Settings.init()设置好, 现在实例化Setting即可得到相应的配置
1.2 new SimScenario();
根据 Settings读取到的配置设定 仿真环境；
1.3 new Report 等类
1.4 由Settings得到warmupTime后, SimClock.setTime();
1.5 SimScenario.createHosts();
每个Group里的各个Host用同样的 MovementModel 和 MessageRouter
for each Groups; 对每个group 里的 Host 逐个进行new, 属性包括 transmitRange，transmitSpeed ,尤其是 MovementModel 和 MessageRouter

                //在函数 SimScenario.createHosts();里面  for each Group;MovementModel mmProto = (MovementModel)s.createIntializedObject(MM_PACKAGE +s.getSetting(MOVEMENT_MODEL_S));MessageRouter mRouterProto = (MessageRouter)s.createIntializedObject(ROUTING_PACKAGE +s.getSetting(ROUTER_S));//看作 //...等其他操作DTNHost host = new DTNHost(this.connectionListeners,this.messageListeners, this.movementListeners,gid, transmitRange, transmitSpeed, mmProto,mRouterProto);

配置文件 default_settings.txt 里相应的配置:

##默认配置
Group.movementModel = ShortestPathMapBasedMovement
##Group.router = PassiveRouter
Group.router = EpidemicRouter
##各个Group的个性配置, 如果没有个性配置，则按照默认配置
Group4.movementModel = MapRouteMovement
Group4.routeFile = data/tram3.wkt
Group4.routeType = 1
Group4.waitTime = 10, 30
Group4.speed = 7, 10
Group4.nrofHosts = 2

Group5.routeFile = data/tram4.wkt
Group5.routeType = 2

Group6.movementModel = MapRouteMovement
Group6.routeFile = data/tram10.wkt
Group6.routeType = 2
之后 SimScenario.hosts.add(host);
1.6 new World(this.scen); world.warmupMovementModel(warmupTime);

1.7 如果warmupTime>0； 即存在 warmup流程;
例如：若warmupTime=3000， 类SimClock的time起始被设置为-3000，一直执行moveHost，直到 类SimClock的time为0

   //World.warmupMovementModel(warmupTime)public void warmupMovementModel(double time) {if (time <= 0) {return;}while(SimClock.getTime() < -updateInterval) {moveHosts(updateInterval);simClock.advance(updateInterval);}double finalStep = -SimClock.getTime();moveHosts(finalStep);simClock.setTime(0);       }* 

2. DTNSimUI.runSim(); 即 DTNSimTextUI.runSim(); 执行流程

         while (simTime < endTime && !simCancelled){try {world.update();   //更新的过程中 已经增加 clockTime;} catch (AssertionError e) {e.printStackTrace();done();return;}simTime = SimClock.getTime(); //此处 只是获取 SimClock.clockTime;this.update(false);}done();this.update(true); // force final UI update
   

2.1 World.update()是 主要的更新函数

    /*** Update (move, connect, disconnect etc.) all hosts in the world.* Performs external events if there are any happening before next time* value*/public void update () {double timeIncrement = this.updateInterval;  //每次事件步进的 长度// is it time to process next external event   if (SimClock.getTime() >= this.nextExternalEventTime) {        //若 外部事件 会在本次步进之前发生；ExternalEvent ee = this.extEvents.nextEvent();                  //获取外部事件并处理ee.processEvent(this);this.nextExternalEventTime = this.extEvents.nextEventsTime();  //更新下次外部事件发生的时间}else { // no external events left for this time step          //若 外部事件 不发生         moveHosts(timeIncrement);                                      //Host移动if (simulateConnections) {                                      //是否  simulateConnections, 若是 则尝试 connectconnectHosts();            // make connections}// update rest of the stuff                                     //此处是排除 更新顺序导致的 干扰if (this.updateOrder == null) { // randomizing is offfor (int i=0, n = hosts.size();i < n; i++) {hosts.get(i).update();                             //更新Host}}else { // update order randomizing is onassert this.updateOrder.size() == this.hosts.size() :"Nrof hosts has changed unexpectedly";Random rng = new Random(SimClock.getIntTime());Collections.shuffle(this.updateOrder, rng);for (int i=0, n = hosts.size();i < n; i++) {this.updateOrder.get(i).update();}                   }simClock.advance(timeIncrement); // advance the clock            //SimClock前进}// inform all update listenersfor (UpdateListener ul : this.updateListeners) {                   //更新World上的Listenersul.updated(this.hosts);}}

2.2 关于外部事件: 包括 消息生成


外部事件 补充说明****

2.3 World.moveHosts(double timeIncrement)

           //World.moveHosts(double timeIncrement)private void moveHosts(double timeIncrement) {for (int i=0,n = hosts.size(); i<n; i++) {DTNHost host = hosts.get(i);host.move(timeIncrement);         //主要操作： 时间间隔timeIncrement内的DTNHost的移动if (conGrid != null ){            //另外网格机制：把DTNHost在Map里的的移动做成网格；通过网格是否相邻的判断 减少对 所有DTNHost相邻的判断；起到加速作用而已conGrid.updateLocation(host);}}            }

World.moveHosts(double timeIncrement) 实际上是经过了时间间隔timeIncrement,
for each各个DTNHost的位置都发生移动；通过DTNHost.move()实现。

   //DTNHost.move()public void move(double timeIncrement) { if (!isActive() || SimClock.getTime() < this.nextTimeToMove) {return;}double possibleMovement = timeIncrement * speed;double distance = this.location.distance(this.destination);//如果经过本次时间间隔timeIncrement, DTNHost的新位置已经覆盖到了之前指定的目的地DTNHost.destination，则需要设置下一个DTNHost.destination /speed /nextTimeToMovewhile (possibleMovement >= distance) {// node can move past its next destinationthis.location.setLocation(this.destination); // snap to  destinationpossibleMovement -= distance;if (!setNextWaypoint()) { // get a new waypointreturn; // no more waypoints left}distance = this.location.distance(this.destination);}// move towards the point for possibleMovement amount                 //两个相邻点的方向, 前进x和y的距离double dx, dy;dx = (possibleMovement/distance) * (this.destination.getX() -this.location.getX());dy = (possibleMovement/distance) * (this.destination.getY() -this.location.getY());this.location.translate(dx, dy);}

DTNHost.move() 采用规则：设置一个目的地，移动过去（随时间）；如果到了当前目的地，再设置下一个目的地/速度/出发时间。
这里涉及的参数包括: DTNHost.destination //下一个目的地的 ; DTNHost.speed //speed 速度; DTNHost.nextTimeToMove //下次启动时间;
这些参数通过DTNHost.setNextWaypoint()进行更新;

   //DTNHost.setNextWaypoint();   //DTNHost的成员 private Path path; 和 private MovementModel movement;//Sets the next destination and speed to correspond the next waypoint on the path.private boolean setNextWaypoint() {if (path == null) {path = movement.getPath();                           //初始化Path path}if (path == null || !path.hasNext()) {this.nextTimeToMove = movement.nextPathAvailable();this.path = null;return false;                                        }this.destination = path.getNextWaypoint();this.speed = path.getSpeed();if (this.movListeners != null) {for (MovementListener l : this.movListeners) {l.newDestination(this, this.destination, this.speed);}}return true;}

实际上, 下一个Dest 由类Path = MovementModel.getpath(); 决定了
类MovementModel 的 各个子类: 都实现了getPath();函数;

2.4 若 simulateConnections==true, 则执行World.connectHosts()
connectHost流程补充说明****

2.5 DTNHost.update() 流程补充说明 包括: NetworkLayer.update() 和 MessageRouter.update

   //DTNHost.update()public void update() {if (!isActive()) {return;}this.net.update();this.router.update();}

2.5.1 NetworkLayer.update()

   /*** Updates the state of current connections (ie tears down connections* that are out of range).*/public void update() {for (int i=0; i<this.connections.size(); ) {Connection con = this.connections.get(i);DTNHost anotherNode = con.getOtherNode(this.host);// all connections should be up at this stageassert con.isUp() : "Connection " + con + " was down!";if (!isWithinRange(anotherNode)) {con.setUpState(false);notifyConnectionListeners(CON_DOWN, anotherNode);// tear down bidirectional connectionif (!anotherNode.getConnections().remove(con)) {throw new SimError("No connection " + con + "  found in " +anotherNode);}this.host.changedConnection(con);anotherNode.changedConnection(con);connections.remove(i);}else {i++;}}}

2.5.2 MessageRouter.update()
详见 另文档