责任链模式

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责任链：每个对象有对其下家的引用而形成的一条链
当前对象自己条件不符合或处理不了，
交由下家对象处理，一直传递下去直到处理完请求
下家对象是什么鬼：就是new出自家的时候化设置的下家对象

缘起

客服系统中消息回复超时提示告警,超时时间以不同方式提示具体的业务对象执行

  • 时间边界– 5分钟/10分钟/30分钟内客服没有回复用户信息则提示
  • 提示方式– 短信/微信/邮件/钉钉等
  • 提示对象有– 客服/老板/系统清除对象

直接上代码

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/**
 * 告警责任链
 *
 * @author hubo
 * @since 2017-06-29 18:53
 **/
public abstract class AlarmHandler {
    protected AlarmHandler nextAlarmHandler;
    protected AlarmHandler getNextAlarmHandler() {
        return nextAlarmHandler;
    }
    /**
     * 告警
     *
     * @param ruleTime 规则时间
     */
    protected abstract void alarm(final long ruleTime, final AlarmEvent alarmInfo);
}
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/**
 * 客服链对象
 * 5分钟时间客服不回复访客消息则提示客服
 *
 * @author hubo
 * @since 2017-06-29 18:57
 **/
public class AlarmToCustomer extends AlarmHandler {
    public AlarmToCustomer(Builder builder) {
        this.nextAlarmHandler = builder.nextHandler;
    }
    /**
     * 告警业务操作
     *
     * @param ruleTime  规则时间
     * @param alarmInfo
     */
    public void alarm(final long ruleTime, final AlarmEvent alarmInfo) {
        if (ruleTime >= 5) {
            System.out.println("超过5分钟，提示客服");
        } else {
            if (getNextAlarmHandler() != null)
                getNextAlarmHandler().alarm(ruleTime, alarmInfo);
        }
    }
    public static class Builder {
        private AlarmHandler nextHandler;
        public Builder() {
        }
        public Builder(AlarmHandler nextHandler) {
            this.nextHandler = nextHandler;
        }
        public Builder nextHandler(AlarmHandler nextHandler) {
            this.nextHandler = nextHandler;
            return this;
        }
        public AlarmToCustomer build() {
            return new AlarmToCustomer(this);
        }
    }
}
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/**
 * Boss告警链
 * 15分钟时间客服不回复访客消息通知Boss
 *
 * @author hubo
 * @since 2017-06-29 18:57
 **/
public class AlarmToBoss extends AlarmHandler {
    public AlarmToBoss(Builder builder) {
        this.nextAlarmHandler = builder.nextHandler;
    }
    /**
     * 告警业务操作
     *
     * @param ruleTime  规则时间
     * @param alarmInfo
     */
    public void alarm(final long ruleTime, final AlarmEvent alarmInfo) {
        if (ruleTime >= 15) {
            System.out.println("超过15分钟，告知Boss,客服在打酱油");
        } else {
            if (getNextAlarmHandler() != null)
                getNextAlarmHandler().alarm(ruleTime, alarmInfo);
        }
    }
    public static class Builder {
        private AlarmHandler nextHandler;
        public Builder() {
        }
        public Builder nextHandler(AlarmHandler nextHandler) {
            this.nextHandler = nextHandler;
            return this;
        }
        public AlarmToBoss build() {
            return new AlarmToBoss(this);
        }
    }
}
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/**
 * 销毁任务对象链
 * 超过30分钟时间客服不回复访客清除任务
 *
 * @author hubo
 * @since 2017-06-29 18:57
 **/
public class AlarmToDestroy extends AlarmHandler {
    public AlarmToDestroy() {
    }
    /**
     * 告警业务操作
     *
     * @param ruleTime  规则时间
     * @param alarmInfo
     */
    public void alarm(final long ruleTime, final AlarmEvent alarmInfo) {
        if (ruleTime >= 30) {
            System.out.println("超过30分钟，不再提示了");
        } else {
            if (getNextAlarmHandler() != null)
                getNextAlarmHandler().alarm(ruleTime, alarmInfo);
        }
    }
}

应用

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//组合责任链
AlarmToDestroy destroy = new AlarmToDestroy();
AlarmToBoss boss = new AlarmToBoss.Builder().nextHandler(destroy).build();
AlarmToCustomer customer = new AlarmToCustomer.Builder().nextHandler(boss).build();
customer.alarm(4, new AlarmInfo());
customer.alarm(20, new AlarmInfo());
customer.alarm(35, new AlarmInfo());