比较简单的策略模式实战_camunda策略模式-优快云博客

本文介绍了如何在Java中通过接口TimerDefinitionProcess定义处理逻辑，展示了Date和Duration类型的实现，并通过TimerDefinitionFactory提供灵活的工厂方法。核心内容包括定时表达式处理和实现类的示例。

package com.fy.camunda.back.service;

/**
 * @ClassName TimerDefinitionProcess
 * @author: maliang
 * @Description 处理接口
 * @date 2022/2/8 9:21
 * @Version 1.0版本
 */
public interface TimerDefinitionProcess {
    String Process(Integer value);
}

package com.fy.camunda.back.service.impl;

import com.fy.camunda.back.service.TimerDefinitionProcess;

/**
 * @ClassName DefinitionTypeDate
 * @author: maliang
 * @Description 日期处理
 * @date 2022/2/8 9:23
 * @Version 1.0版本
 */
public class DefinitionDate implements TimerDefinitionProcess {
    @Override
    public String Process(Integer value) {
        return "PD" + value + "S";
    }
}

package com.fy.camunda.back.service.impl;

import com.fy.camunda.back.service.TimerDefinitionProcess;

/**
 * @ClassName DefinitionDuration
 * @author: maliang
 * @Description 毫秒值处理
 * @date 2022/2/8 9:23
 * @Version 1.0版本
 */
public class DefinitionDuration implements TimerDefinitionProcess {
    @Override
    public String Process(Integer value) {
        return "PT" + value + "S";
    }
}

package com.fy.camunda.common.factory;

import com.fy.camunda.back.service.TimerDefinitionProcess;
import com.fy.camunda.back.service.impl.DefinitionDate;
import com.fy.camunda.back.service.impl.DefinitionDuration;

import java.util.HashMap;
import java.util.Map;

/**
 * @ClassName TimerDefinitionFactory
 * @author: maliang
 * @Description 超时表达式处理工厂类
 * @date 2022/2/8 9:20
 * @Version 1.0版本
 */
public class TimerDefinitionFactory {

    /**
     * 缓存
     */
    private static final Map<Integer, TimerDefinitionProcess> TIMER_DEFINITION_PROCESS_MAP = new HashMap<>(3);

    private TimerDefinitionFactory() {
    }

    static {
        TIMER_DEFINITION_PROCESS_MAP.put(1, new DefinitionDate());
        TIMER_DEFINITION_PROCESS_MAP.put(2, new DefinitionDuration());
    }

    public static TimerDefinitionProcess getMethod(Integer type) {
        return TIMER_DEFINITION_PROCESS_MAP.get(type);
    }


}

package com.fy.camunda.common.utils;

import com.fy.camunda.back.service.TimerDefinitionProcess;
import com.fy.camunda.common.factory.TimerDefinitionFactory;
import org.springframework.stereotype.Component;

/**
 * @ClassName TimerDefinitionContext
 * @author: maliang
 * @Description 用户使用类
 * @date 2022/2/8 9:29
 * @Version 1.0版本
 */
@Component
public class TimerDefinitionContext {

    private TimerDefinitionProcess timerDefinitionProcess;

    public String getDefinition(Integer value) {
        return timerDefinitionProcess.Process(value);
    }

    public TimerDefinitionContext definitionMethod(Integer type) {
        this.timerDefinitionProcess = TimerDefinitionFactory.getMethod(type);
        return this;
    }

}

使用时直接对TimerDefinitionContext @resouces就行

 String definition = timerDefinitionContext.definitionMethod(reqTimer.getTimerDefinitionType()).getDefinition(reqTimer.getUserInput());