字段监控设计

• 需要形容: 一个实体的字段可能会有后续的行为.

• 字段有什么变动会有什么样的操作

  1. 字段变动.
  2. 常见新老数据变更的日志记录
  3. 字段间接会产生行为

  4. 发消息的场景. 填写了用户 id 就发送音讯

     • 上述为目前想到的字段监控可能存在的场景. 针对这样的场景做出如下设计.
• 接口形象

public interface MonitoringInterface<T> {void monitor(T t);
}
/**
 * 监控: 字段变更.
 * 字段变更后须要做的事件
 */public interface MonitoringFieldChange<T> {void filedChange(T t);
}
/**
 * 监控, 通过字段决定后续工作.
 * 例如传递这个值会后续执行什么事件.
 */public interface MonitoringFieldWork<T> {void fieldWork(T t);}

• 三个接口的作用

  1. MonitoringInterface 整体监控
  2. MonitoringFieldChange 字段变更的监控
  3. MonitoringFieldWork 字段决定行为的监控
  • 综合后面的需要形容做出一个通用定义.

• 传入对象, 通过这个对象去调用 字段变更监控办法 和 字段决定行为的监控办法

public class SupperMonitor<T> {
private final T data;
private MonitoringFieldChange<T> fieldChange;
private MonitoringFieldWork<T> fieldWork;
public SupperMonitor(T data, MonitoringFieldChange<T> fieldChange, MonitoringFieldWork<T> fieldWork) {this.data = data; this.fieldChange = fieldChange; this.fieldWork = fieldWork;}
public void monitor() { this.fieldChange.filedChange(data); this.fieldWork.fieldWork(data); }
}

- 在这里还能够用工程去创立外部变量 **fieldChange** 和 **fieldWork**
- 暂且称 **SupperMonitor** 是一个兼顾调用对象. 接下来是几个接口的实现
 在实现之前定义出如下两个接口. 用来做类型限定. 
上面两个接口外部填写的形象办法是咱们须要比拟的字段或者须要依据某个字段去做操作的形象
 将不同的字段解决计划放在两个不同的接口中, 将行为逻辑隔离.

public interface FirstFieldChangeMonitoring extends MonitoringFieldChange<FirstModel> {
void nameChangeMonitor(String oldName, String newName);
default Class<?> type() { return FirstModel.class;}}
public interface FirstFieldWorkMonitoring extends MonitoringFieldWork<FirstModel> {
void workByWorkField(boolean work);
default Class<?> type() { return FirstModel.class;}}

- 实现以及调用

public class FirstFieldChangeMonitoringImpl implements MonitoringInterface<FirstModel>, FirstFieldWorkMonitoring, FirstFieldChangeMonitoring {
@Override public void nameChangeMonitor(String oldName, String newName) {System.out.println(“ 数据变更 ” + oldName + “t” + newName);
}
@Override public void filedChange(FirstModel firstModel) {this.nameChangeMonitor(“”, firstModel.getName()); }
@Override public void workByWorkField(boolean work) {if (work) {System.out.println(“ 开始工作 ”);
} }
@Override public Class<?> type() { return FirstModel.class;}
@Override public void fieldWork(FirstModel firstModel) {this.workByWorkField(firstModel.isWork()); }
@Override public void monitor(FirstModel firstModel) {SupperMonitor<FirstModel> firstModelSupperMonitor = new SupperMonitor<>(firstModel, this, this);
firstModelSupperMonitor.monitor();}
public static void main(String[] args) {FirstFieldChangeMonitoringImpl firstFieldChangeMonitoring = new FirstFieldChangeMonitoringImpl(); FirstModel firstModel = new FirstModel(); firstModel.setName(“aaaaaa”); firstModel.setWork(true); firstFieldChangeMonitoring.monitor(firstModel); }}

- 接下来就是一个配合应用的技巧. 
先做出第二个对象的一个监控实现
     

public interface SecondFieldWorkMonitoring extends MonitoringFieldWork<SecondModel> {
void workByWorkField(boolean work);
default Class<?> type() { return SecondModel.class;}}
public class SecondFieldWorkMonitoringImpl implements SecondFieldWorkMonitoring {
@Override public void workByWorkField(boolean work) {System.out.println(“ 第二个 model 的 work”);
}
@Override public void fieldWork(SecondModel secondModel) {this.workByWorkField(secondModel.isWorking()); }}

- 补充监控字段, 测试和实现如下

public class FirstFieldChangeMonitoringImpl implements MonitoringInterface<FirstModel>, FirstFieldWorkMonitoring, FirstFieldChangeMonitoring {
public static void main(String[] args) {FirstFieldChangeMonitoringImpl firstFieldChangeMonitoring = new FirstFieldChangeMonitoringImpl(); SecondModel secondModel = new SecondModel(); secondModel.setWorking(false);
FirstModel firstModel = new FirstModel(); firstModel.setName(“aaaaaa”); firstModel.setWork(true); firstModel.setSecondModel(secondModel);
firstFieldChangeMonitoring.monitor(firstModel); }
@Override public void nameChangeMonitor(String oldName, String newName) {System.out.println(“ 数据变更 ” + oldName + “t” + newName);
}
@Override public void filedChange(FirstModel firstModel) {// 字段变动工作
this.nameChangeMonitor(“”, firstModel.getName()); }
@Override public void workByWorkField(boolean work) {if (work) {System.out.println(“ 开始工作 ”);
} }
@Override public void workBySecondField(SecondModel secondModel) {SupperMonitor<SecondModel> secondModelSupperMonitor = new SupperMonitor<>(secondModel); secondModelSupperMonitor.monitor();}
@Override public Class<?> type() { return FirstModel.class;}
@Override public void fieldWork(FirstModel firstModel) {// 字段行为工作
this.workByWorkField(firstModel.isWork()); this.workBySecondField(firstModel.getSecondModel()); }
@Override public void monitor(FirstModel firstModel) {SupperMonitor<FirstModel> firstModelSupperMonitor = new SupperMonitor<>(firstModel, this, this);
firstModelSupperMonitor.monitor();}}

- 这是目前笔者的一个想法. 各位阅读者如果有想法请在评论中告知.