前言 AOP 全名為:Aspect-Oriented Programming，在Java中如何實現呢?
透過Design Pattern 中的Proxy Pattern來實現 透過AspectJ or Spring Aop來實現 本章節主要講Proxy Pattern的實現方式
主要內容 我們有個需求是，需要提升查詢的效能，所以我們的做法是增加Cache Version 1 第一個版本，我們先建立的代碼 建立一個service 和一個repo，從repo 拿取相對應的user public class FindUserService { private final UserRepo userRepo; public FindUserService(final UserRepo userRepo) { this.userRepo = userRepo; } public User find(String username) { return userRepo.findByUsername(username); } } @AllArgsConstructor @NoArgsConstructor @Data @Builder public class User { String username; String password; } public interface UserRepo { User findByUsername(String username); } public class UserAdapter implements UserRepo { private final Map<String, User> userMap; private final ReentrantReadWriteLock lock; public UserAdapter(final Map<String, User> userMap) { this....
步驟 安裝Prometheus/Grafana 設定Prometheus設定向我們spring boot application位置 # my global config
global:
scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
scrape_configs:
# The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
- job_name: 'My-Spring-Boot-Application'
# Override the global default and scrape targets from this job every 5 seconds....
前言 常在河邊走那裡不失鞋，當一個後端工程師，常常會遇到上線Application server突然無法壞掉的問題，因此我們需要一個監控的Server來輔助我們上線的Application，本篇將使用Prometheus監控server當作範例來做為展示 步驟 Spring boot 安裝Prometheus Client 在pom.xml上新增兩個dependency spring-boot-starter-actuator: spring boot內建的監控library micrometer-registry-prometheus: 在spring boot上提供prometheus metrics格式 <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-registry-prometheus</artifactId>
</dependency> Spring boot 調整設定檔 在applcation.yml 新增下列設定 management:
endpoint:
health:
show-details: always
prometheus:
enabled: true
endpoints:
web:
exposure:
include: prometheus,health
metrics:
tags:
application: ${spring.application.name}
health:
diskspace:
enabled: true
defaults:
enabled: false 設定好，啟動spring boot即可在http://:/actuator/prometheus看到metrics 參考連結 Spring boot Spring boot Actuator Micrometer Registry Prometheus