后端轮询处理

来源：互联网发布：淘宝代销订单怎么处理编辑：程序博客网时间：2024/05/05 23:00

前一篇讲了前端利用ajax轮询查询请求进度，下面我们来说下，后台怎么处理。废话不多说，上代码：
首先，定义好接口规则：

public interface CheckFilter {    /**     * 检查订单     *     * @param eorder     * @return     */    boolean check(CheckInvocation invocation);    /**     * 获取错误信息     *     * @return     */    String getErrorMessage();}

此接口定义了检测类的实现规范，以及提示信息。然后定义默认的实现类：

package com.zxtx.apps.traffic.eorder.check.impl;import com.zxtx.apps.traffic.DangerEnterprise;import com.zxtx.apps.traffic.DangerVehicle;import com.zxtx.apps.traffic.DangerWorker;import com.zxtx.apps.traffic.Enterprise;import com.zxtx.apps.traffic.VehicleLicense;import com.zxtx.apps.traffic.eorder.Eorder;import com.zxtx.apps.traffic.eorder.EorderGoods;import com.zxtx.apps.traffic.eorder.check.CheckFilter;import com.zxtx.apps.traffic.eorder.check.CheckInvocation;import org.llama.library.utils.ClassUtils;import java.util.ArrayList;import java.util.Iterator;import java.util.List;/** * Created by Tonny on 2016/10/25. */public class DefaultCheckInvocation implements CheckInvocation {    private Eorder eorder;    private DangerVehicle tractor;    private VehicleLicense vehicleLicense;    private DangerVehicle trailer;    private VehicleLicense trailerLicense;    private DangerWorker driver;    private DangerWorker supercargo;    private List<EorderGoods> eorderGoods;    private DangerEnterprise dangerEnterprise;    private Iterator<CheckFilter> checkFilterIterator;    private boolean executed = false;    private String filterClasses;    private String errorMessage;    private List<String> progess = new ArrayList<String>();    @Override    public Eorder getEorder() {        return eorder;    }    @Override    public DangerVehicle getTractor() {        return tractor;    }    @Override    public DangerVehicle getTrailer() {        return trailer;    }    @Override    public DangerWorker getDriver() {        return driver;    }    @Override    public DangerWorker getSupercargo() {        return supercargo;    }    @Override    public VehicleLicense getVehicleLicense() {        return vehicleLicense;    }    @Override    public VehicleLicense getTrailerLicense() {        return trailerLicense;    }    @Override    public List<EorderGoods> getEorderGoods() {        // TODO Auto-generated method stub        return eorderGoods;    }    public void setEorder(Eorder eorder) {        this.eorder = eorder;    }    public void setTractor(DangerVehicle tractor) {        this.tractor = tractor;    }    public void setTrailer(DangerVehicle trailer) {        this.trailer = trailer;    }    public void setDriver(DangerWorker driver) {        this.driver = driver;    }    public void setSupercargo(DangerWorker supercargo) {        this.supercargo = supercargo;    }    public void setFilterClasses(String filterClasses) {        this.filterClasses = filterClasses;    }    public void setVehicleLicense(VehicleLicense vehicleLicense) {        this.vehicleLicense = vehicleLicense;    }    public void setTrailerLicense(VehicleLicense trailerLicense) {        this.trailerLicense = trailerLicense;    }    public void setEorderGoods(List<EorderGoods> eorderGoods) {        this.eorderGoods = eorderGoods;    }    @Override    public List<String> getProgess() {        return progess;    }    @Override    public String getErrorMessage() {        return errorMessage;    }    public void setProgess(List<String> progess) {        this.progess = progess;    }    public boolean isExecuted() {        return executed;    }    public void setExecuted(boolean executed) {        this.executed = executed;    }    @Override    public DangerEnterprise getDangerEnterprise() {        return dangerEnterprise;    }    public void setDangerEnterprise(DangerEnterprise dangerEnterprise) {        this.dangerEnterprise = dangerEnterprise;    }    @Override    public boolean invoke() {        if (executed) {            return false;        }        if (checkFilterIterator.hasNext()) {            CheckFilter filter = checkFilterIterator.next();            boolean result = filter.check(this);            if (!result) {                if(errorMessage==null){                    errorMessage = filter.getErrorMessage();                }                return false;            }        }        executed = true;        return true;    }    @Override    public void init() {        if (checkFilterIterator == null) {            String[] c = filterClasses.split(",");            List<CheckFilter> fs = new ArrayList<CheckFilter>();            for (String s : c) {                CheckFilter o = ClassUtils.newInstance(s);                fs.add(o);            }            this.checkFilterIterator = fs.iterator();        }    }}

默认实现类，实例化需要检测的类对象，并实现检测规则。发送检测请求

 public String checkEorder(){        session.remove("defaultCheckInvocation");        initCheck();//注意这行代码初始化方法        session.put("defaultCheckInvocation", defaultCheckInvocation);        defaultCheckInvocation.invoke();//注意这行代码        ret = true;        return SUCCESS;    }

获取轮询请求：

  public String getCheckProgress(){        while(true){            defaultCheckInvocation = (DefaultCheckInvocation) session.get("defaultCheckInvocation");            if(defaultCheckInvocation!=null){                break;            }        }        progessList = defaultCheckInvocation.getProgess();        //出现错误信息        if(defaultCheckInvocation.getErrorMessage()!=null){            progessList.add("-1");            progessList.add(defaultCheckInvocation.getErrorMessage());            session.remove("defaultCheckInvocation");        }        if(defaultCheckInvocation.isExecuted()){            progessList.add("0");            session.remove("defaultCheckInvocation");        }        defaultCheckInvocation.setProgess(new ArrayList<String>());        return SUCCESS;    }

下面就是各个检测的实现类：

public class WorkerExistCheck implements CheckFilter{    @Override    public boolean check(CheckInvocation invocation) {        // TODO Auto-generated method stub        //获取人员        DangerWorker worker = invocation.getDriver();        //获取押运员        DangerWorker supercargo = invocation.getSupercargo();        if(worker==null||supercargo==null){            return false;        }        invocation.getProgess().add("是否配备驾驶员和押运员检测完毕");        return invocation.invoke();    }    @Override    public String getErrorMessage() {        // TODO Auto-generated method stub        return "未配备驾驶员或者押运员";    }}

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