前面我们写的Model都是基于SimModelImpl 的，其实可以有一个更好的父类可以让我们使用，那就是SimpleModel，它也是继承自SimModelImpl，我们来分析下它的源代码
package wxy;
import java.util.ArrayList;
import java.util.Date;
import cern.jet.random.Uniform;
import cern.jet.random.engine.MersenneTwister;
import uchicago.src.sim.engine.BasicAction;
import uchicago.src.sim.engine.Schedule;
import uchicago.src.sim.engine.SimModelImpl;
import uchicago.src.sim.engine.Stepable;
import uchicago.src.sim.util.Random;
import uchicago.src.sim.util.SimUtilities;
public class SimpleModel extends SimModelImpl {
protected Schedule schedule;
protected ArrayList agentList = new ArrayList();
protected String name = "A Repast Model";
protected String[] params = {""};
private double stoppingTime = Double.POSITIVE_INFINITY;
private BasicAction stoppingAction;
protected boolean autoStep = false;
protected boolean shuffle = false;
protected long seed = 1;
protected boolean isGui;
protected long startAt = 1;
/*下面这些方法我们可以不用管它*/
public void setStoppingTime(long time) {
setStoppingTime((double) time);
}
public void setStoppingTime(double time) {
stoppingTime = time;
if (stoppingAction != null) schedule.removeAction(stoppingAction);
if (schedule != null) setStopAction();
}
private void setStopAction() {
stoppingAction = schedule.scheduleActionAt(stoppingTime,
this, "stop", Schedule.LAST);
}
public void setRngSeed(long seed) {
this.seed = seed;
super.setRngSeed(seed);
Random.createUniform();
}
/*上面这些方法我们可以不用管它*/
//下面2个是产生随机数的函数，由于模拟对随机要求比较高，RePast是用 colt 里的包来处理相关
//数字计算的
public int getNextIntFromTo(int from, int to) {
return Random.uniform.nextIntFromTo(from, to);
}
public double getNextDoubleFromTo(double from, double to) {
return Random.uniform.nextDoubleFromTo(from, to);
}
public void setup() {
isGui = !(getController().isBatch());
stoppingTime = Double.POSITIVE_INFINITY;
stoppingAction = null;
schedule = new Schedule();
agentList = new ArrayList();
setRngSeed(seed);
Random.createUniform();
}
//Random.createUniform();实际上就是产生全局随机种子的方法。查看Random的源代码，可以发现下面的代码片段
// public static void createUniform() {
// uniform = new Uniform(generator);
// }
// static {
// Date d = new Date();
// rngSeed = d.getTime();
// generator = new MersenneTwister(d);
// }
//
// 这些我们也不用去管，直接使用SimpleModelget.NextIntFromTo（）就可以了。
public void begin() {
buildModel();
buildSchedule();
}
public void buildModel() {} //需要在子类里重写
public void buildSchedule() {
if (autoStep) schedule.scheduleActionBeginning(startAt, this,
"runAutoStep");
else schedule.scheduleActionBeginning(startAt, this, "run");
schedule.scheduleActionAtEnd(this, "atEnd");
schedule.scheduleActionAtPause(this, "atPause");
setStopAction();
}
//这个方法，子类用不用super.buildSchedule都无所谓，就看你需不需要在按下暂停和开始停止之类的事件里做文章了
//下面这些方法我们也可以不用管
public String getName() {
return name;
}
public Schedule getSchedule() {
return schedule;
}
public String[] getInitParam() {
return params;
}
public void atPause() {}
public void atEnd() {}
public void runAutoStep() {
preStep();
autoStep();
postStep();
}
public void run() {
preStep();
step();
postStep();
}
private void autoStep() {
if (shuffle) SimUtilities.shuffle(agentList);
int size = agentList.size();
for (int i = 0;i < size; i++) {
Stepable agent = (Stepable)agentList.get(i);
agent.step();
}
}
protected void preStep() {}
protected void step() {}
protected void postStep() {}
/* 综上所分析，我们写一个子类去继承这个父类后，其实只要做3件事情
* 1、buildModel()
* 2、buildSchedule()
* 3、main函数
* 其它事情，在这个父类里已经都完成了，不需要再理会
*
*/
}
更多repast资料查阅
repast-tool
package wxy;import java.util.ArrayList;import java.util.Date;import cern.jet.random.Uniform;import cern.jet.random.engine.MersenneTwister;import uchicago.src.sim.engine.BasicAction;import uchicago.src.sim.engine.Schedule;import uchicago.src.sim.engine.SimModelImpl;import uchicago.src.sim.engine.Stepable;import uchicago.src.sim.util.Random;import uchicago.src.sim.util.SimUtilities;public class SimpleModel extends SimModelImpl {
protected Schedule schedule; protected ArrayList agentList = new ArrayList(); protected String name = "A Repast Model"; protected String[] params = {""};
private double stoppingTime = Double.POSITIVE_INFINITY; private BasicAction stoppingAction; protected boolean autoStep = false; protected boolean shuffle = false; protected long seed = 1; protected boolean isGui; protected long startAt = 1;/*下面这些方法我们可以不用管它*/ public void setStoppingTime(long time) { setStoppingTime((double) time); } public void setStoppingTime(double time) { stoppingTime = time; if (stoppingAction != null) schedule.removeAction(stoppingAction); if (schedule != null) setStopAction(); } private void setStopAction() { stoppingAction = schedule.scheduleActionAt(stoppingTime, this, "stop", Schedule.LAST); } public void setRngSeed(long seed) { this.seed = seed; super.setRngSeed(seed); Random.createUniform(); } /*上面这些方法我们可以不用管它*/ //下面2个是产生随机数的函数，由于模拟对随机要求比较高，RePast是用 colt 里的包来处理相关 //数字计算的 public int getNextIntFromTo(int from, int to) { return Random.uniform.nextIntFromTo(from, to); } public double getNextDoubleFromTo(double from, double to) { return Random.uniform.nextDoubleFromTo(from, to); } public void setup() { isGui = !(getController().isBatch()); stoppingTime = Double.POSITIVE_INFINITY; stoppingAction = null; schedule = new Schedule(); agentList = new ArrayList(); setRngSeed(seed); Random.createUniform(); } //Random.createUniform();实际上就是产生全局随机种子的方法。查看Random的源代码，可以发现下面的代码片段 // public static void createUniform() {// uniform = new Uniform(generator);// }// static {// Date d = new Date();// rngSeed = d.getTime();// generator = new MersenneTwister(d);// }// // 这些我们也不用去管，直接使用SimpleModelget.NextIntFromTo（）就可以了。 public void begin() { buildModel(); buildSchedule(); } public void buildModel() {} //需要在子类里重写 public void buildSchedule() { if (autoStep) schedule.scheduleActionBeginning(startAt, this, "runAutoStep"); else schedule.scheduleActionBeginning(startAt, this, "run"); schedule.scheduleActionAtEnd(this, "atEnd"); schedule.scheduleActionAtPause(this, "atPause"); setStopAction(); } //这个方法，子类用不用super.buildSchedule都无所谓，就看你需不需要在按下暂停和开始停止之类的事件里做文章了 //下面这些方法我们也可以不用管 public String getName() { return name; } public Schedule getSchedule() { return schedule; } public String[] getInitParam() { return params; } public void atPause() {} public void atEnd() {} public void runAutoStep() { preStep(); autoStep(); postStep(); } public void run() { preStep(); step(); postStep(); } private void autoStep() { if (shuffle) SimUtilities.shuffle(agentList); int size = agentList.size(); for (int i = 0;i < size; i++) { Stepable agent = (Stepable)agentList.get(i); agent.step(); } } protected void preStep() {} protected void step() {} protected void postStep() {} /* 综上所分析，我们写一个子类去继承这个父类后，其实只要做3件事情 * 1、buildModel() * 2、buildSchedule() * 3、main函数 * 其它事情，在这个父类里已经都完成了，不需要再理会 * */ }repast-tool