SpringBoot结合设计模式（观察者模式、策略模式）- 个人记录

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通过SpringBoot尝试整合观察者模式、策略模式。

这里主要是个人记录，不多做解释

package com.example.springboottest.controller;

import com.example.springboottest.entity.TestModelRequest;
import com.example.springboottest.obeserve.SubjectBean;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.List;

/**
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/25 12:32 AM
 */
@RestController
public class ObserverTest {

    @Resource
    private SubjectBean subjectBean;

    @ResponseBody
    @GetMapping("/observerTest")
    public List<String> observerTest(@RequestBody TestModelRequest request) {
        switch (request.getOption()) {
            case "add":
                return subjectBean.add(request.getTestModel());
            case "update":
                return subjectBean.update(request.getTestModel());
            case "select":
                return subjectBean.select(request.getTestModel());
        }
        return Collections.emptyList();
    }
}

package com.example.springboottest.entity;

import com.example.springboottest.obeserve.TestModel;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;

/**
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/25 3:26 AM
 */
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class TestModelRequest {
    private String option;
    private List<TestModel> testModel;
}

package com.example.springboottest.obeserve;

import java.util.List;

/**
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/24 11:57 PM
 */
public class MyObserver {
    protected List<String> add(TestModel testModel) throws Exception {
        throw new Exception(this.getClass().getName() + "没有实现add");
    }

    protected List<String> update(TestModel testModel) throws Exception {
        throw new Exception(this.getClass().getName() + "没有实现update");
    }

    protected List<String> select(TestModel testModel) throws Exception{
        throw new Exception(this.getClass().getName() + "没有实现select");
    }
}

package com.example.springboottest.obeserve;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.List;

/**
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/25 12:07 AM
 */
@Slf4j
@Component
public class ObserverBean1 {

    @Resource
    private Observer1 observer1;

    protected List<String> add(TestModel testModel) {
        return Collections.singletonList("ob1 - add - " + testModel.arg1);
    }

    protected List<String> update(TestModel testModel) {
        return Collections.singletonList("ob1 - update - " + testModel.arg1);
    }

    protected List<String> select(TestModel testModel) {
        return Collections.singletonList("ob1 - select - " + testModel.arg1);
    }


    @Component
    class Observer1 extends MyObserver implements InitializingBean {

        @Resource
        Subject subject;

        @Override
        protected List<String> add(TestModel testModel) throws Exception {
            return ObserverBean1.this.add(testModel);
        }

        @Override
        protected List<String> update(TestModel testModel) throws Exception {
            return ObserverBean1.this.update(testModel);
        }

        @Override
        protected List<String> select(TestModel testModel) throws Exception {
            return ObserverBean1.this.select(testModel);
        }

        @Override
        public void afterPropertiesSet() throws Exception {
            subject.attach("observer1", this);
        }
    }


}

package com.example.springboottest.obeserve;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.List;

/**
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/25 12:08 AM
 */
@Slf4j
@Component
public class ObserverBean2 {

    @Resource
    private Observer2 observer2;

    protected List<String> add(TestModel testModel) {
        return Collections.singletonList("ob2 - add - " + testModel.arg2);
    }

    protected List<String> update(TestModel testModel) {
        return Collections.singletonList("ob2 - update - " + testModel.arg2);
    }

    protected List<String> select(TestModel testModel) {
        return Collections.singletonList("ob2 - select - " + testModel.arg2);
    }


    @Component
    class Observer2 extends MyObserver implements InitializingBean {

        @Resource
        Subject subject;

        @Override
        protected List<String> add(TestModel testModel) throws Exception {
            return ObserverBean2.this.add(testModel);
        }

        @Override
        protected List<String> update(TestModel testModel) throws Exception {
            return ObserverBean2.this.update(testModel);
        }

        @Override
        protected List<String> select(TestModel testModel) throws Exception {
            return ObserverBean2.this.select(testModel);
        }

        @Override
        public void afterPropertiesSet() throws Exception {
            subject.attach("observer2", this);
        }
    }
}

package com.example.springboottest.obeserve;

import lombok.SneakyThrows;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.stereotype.Component;

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

/**
 * 观察者
 *
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/24 11:39 PM
 */
@Component
public final class Subject extends MyObserver implements InitializingBean {
    Map<String, MyObserver> observerMap;

    void attach(String type, MyObserver observer) {
        observerMap.put(type, observer);
    }

    @SneakyThrows
    public List<String> add(String type, TestModel testModel) {
        return observerMap.get(type).add(testModel);
    }

    @SneakyThrows
    public List<String> update(String type, TestModel testModel) {
        return observerMap.get(type).update(testModel);
    }

    @SneakyThrows
    public List<String> select(String type, TestModel testModel) {
        return observerMap.get(type).select(testModel);
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        observerMap = new HashMap<>();
    }
}

package com.example.springboottest.obeserve;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/25 12:07 AM
 */
@Slf4j
@Component
public class SubjectBean {

    @Resource
    private Subject subject;

    public void attach(String type, MyObserver myObserver) {
        log.info("SubjectBean attach(type: {}, myObserver : {}) ", type, myObserver);
        subject.attach(type, myObserver);
    }

    public String insert(String arg) {
        log.info("insert arg : {}", arg);
        return "{ SubjectBean - " + arg + " }";
    }

    public List<String> add(List<TestModel> testModelList) {
        return testModelList.stream()
                .map(item -> subject.add(item.getType(), item))
                .flatMap(Collection::stream)
                .collect(Collectors.toList());
    }

    public List<String> update(List<TestModel> testModelList) {
        return testModelList.stream()
                .map(item -> subject.update(item.getType(), item))
                .flatMap(Collection::stream)
                .collect(Collectors.toList());
    }

    public List<String> select(List<TestModel> testModelList) {
        return testModelList.stream()
                .map(item -> subject.select(item.getType(), item))
                .flatMap(Collection::stream)
                .collect(Collectors.toList());
    }
}

package com.example.springboottest.obeserve;

import lombok.AllArgsConstructor;
import lombok.Data;

/**
 * @author : Ashiamd email: ashiamd@foxmail.com
 * @date : 2021/10/25 2:45 AM
 */
@Data
@AllArgsConstructor
public class TestModel {
    String type;
    String arg1;
    String arg2;
    String arg3;
}

package com.example.springboottest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootTestApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootTestApplication.class, args);
    }

}

• 输入

curl --location --request GET 'http://localhost:8080/observerTest?args=hehe' \
--header 'User-Agent: apifox/1.0.0 (https://www.apifox.cn)' \
--header 'Content-Type: application/json' \
--data-raw '{
    "option": "update",
    "testModel": [
        {
            "type": "observer1",
            "arg2": "consequat",
            "arg1": "ullamco do adipisicing",
            "arg3": "Ut Excepteur"
        },
        {
            "type": "observer2",
            "arg2": "eu ullamco",
            "arg1": "culpa cillum consequat nostrud",
            "arg3": "nisi officia ad"
        },
        {
            "type": "observer1",
            "arg2": "commodo ad in do",
            "arg1": "Excepteur laboris nulla",
            "arg3": "ipsum culpa commodo mollit id"
        },
        {
            "type": "observer1",
            "arg2": "Ut laboris",
            "arg1": "exercitation aute",
            "arg3": "dolor in consequat"
        }
    ]
}'

• 输出

[
    "ob1 - update - ullamco do adipisicing",
    "ob2 - update - eu ullamco",
    "ob1 - update - Excepteur laboris nulla",
    "ob1 - update - exercitation aute"
]

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