Hikari是Spring Boot預設的資料庫連線池。有別於C3P0直接透過連接池物件取得各項狀態指標，Hikari需要透過JMX來取得。 Demo如下，採用Spring Boot集成，定時擷取連線狀態。
public static void main(String[] args) throws SQLException, MalformedObjectNameException, InterruptedException {
SpringApplication.run(HikariTest.class, args);
HikariDataSource hikaridatasource = new HikariDataSource();
hikaridatasource.setJdbcUrl("jdbc:mysql://localhost:3306?serverTimezone=GMT");
hikaridatasource.setUsername("root");
hikaridatasource.setPassword("");
hikaridatasource.setDriverClassName("com.mysql.cj.jdbc.Driver");
hikaridatasource.setRegisterMbeans(true);
hikaridatasource.setPoolName("HikariConnectionPool");
MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + hikaridatasource.getPoolName() + ")");
poolProxy = JMX.newMXBeanProxy(mBeanServer, poolName, HikariPoolMXBean.class);
Connection conn = hikaridatasource.getConnection();
Statement sm = conn.createStatement();
ResultSet rs = null;
for (int i = 0; i < 999999999; i++) {
rs = sm.executeQuery("select name from test.t1");
}
rs.close();
sm.close();
conn.close();
hikaridatasource.close();
}
@Scheduled(fixedRate = 1000)
public void HikariMonitor() {
if(poolProxy == null) {
log.info("Hikari not initialized,please wait...");
}else {
log.info("HikariPoolState = "
+ "Active=[" + String.valueOf(poolProxy.getActiveConnections() + "] "
+ "Idle=[" + String.valueOf(poolProxy.getIdleConnections() + "] "
+ "Wait=["+poolProxy.getThreadsAwaitingConnection()+"] "
+ "Total=["+poolProxy.getTotalConnections()+"]")));
}
}另外，在github有提到這樣的issue：
ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + hikaridatasource.getPoolName() + ")");可能會拋錯
程式碼效果如下圖22:06:23.231 [ main] DEBUG com.zaxxer.hikari.HikariConfig - Driver class com.mysql.cj.jdbc.Driver found in Thread context class loader sun.misc.Launcher$AppClassLoader@73d16e93
Exception in thlang.main" java. reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy2.getIdleConnections(Unknown Source)
at com.zte.hikariTest.HikariTest.main(HikariTest.java:32)##:32)##usedman. .InstanceNotFoundException: com.zaxxer.hikari:type=Pool (foo)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(Unknown Source)## at com.sun.jmxAtefor. Unknown Source)
at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(Unknown Source)
at com.sun.jmx.mbeanserver.MXBeanProxy$GetHandler.invoke(Unknown Source). .jmx.mbeanserver.MXBeanProxy.invoke(Unknown Source)
at javax.management.MBeanServerInvocationHandler.invoke(Unknown Source)
... 2 more
##這是因為Hikari設定參數同樣支援setHikariConfig和設定檔兩種配置方式，請選擇其中一種進行配置，而不是二者一起使用。並且請配置屬性如下，否則 JMX 無法生效。hikaridatasource.setRegisterMbeans(true);登入後複製
2019-03-09 02:05:04.738 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait=[0] Total=[10]
2019-03-09 02:05:05.740 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1 ] Idle=[9] Wait=[0] Total=[10]
2019-03-09 02:05:07.738 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait= [0] Total=[10]
以上是如何實現Hikari連線池使用SpringBoot設定JMX監控的詳細內容。更多資訊請關注PHP中文網其他相關文章！
