50 lines
2.0 KiB
Java
50 lines
2.0 KiB
Java
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package com.example.scaffold.learning.lifecycle;
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import jakarta.annotation.PostConstruct;
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import jakarta.annotation.PreDestroy;
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import org.springframework.stereotype.Component;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.UUID;
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import java.util.concurrent.atomic.AtomicInteger;
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@Component("iocSingletonLifecycleBean")
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public class SingletonLifecycleBean implements LifecycleDemoBean {
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static {
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IocLifecycleTracker.record("iocSingletonLifecycleBean", "singleton", "class-load", "JVM 初始化类（static block）");
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}
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private final String instanceId = UUID.randomUUID().toString().substring(0, 8);
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private final AtomicInteger accessCount = new AtomicInteger(0);
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public SingletonLifecycleBean() {
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IocLifecycleTracker.record("iocSingletonLifecycleBean", "singleton", "constructor", "构造器执行，实例ID=" + instanceId);
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}
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@PostConstruct
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public void init() {
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IocLifecycleTracker.record("iocSingletonLifecycleBean", "singleton", "post-construct", "Bean 初始化完成，已进入单例生命周期");
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}
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@PreDestroy
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public void destroy() {
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IocLifecycleTracker.record("iocSingletonLifecycleBean", "singleton", "pre-destroy", "容器关闭时销毁单例 Bean");
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}
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@Override
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public Map<String, Object> inspect(String trigger) {
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int count = accessCount.incrementAndGet();
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IocLifecycleTracker.record("iocSingletonLifecycleBean", "singleton", "method-call", "trigger=" + trigger + ", accessCount=" + count);
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Map<String, Object> result = new LinkedHashMap<>();
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result.put("beanName", "iocSingletonLifecycleBean");
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result.put("scope", "singleton");
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result.put("instanceId", instanceId);
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result.put("identityHashCode", System.identityHashCode(this));
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result.put("accessCount", count);
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result.put("explanation", "单例 Bean 在容器中通常只创建一次，后续每次获取都是同一个实例");
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return result;
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}
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}
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