feat: 更新 JMX 教程(https://www.wdbyte.com/java/jmx.html)

niumoo · niumoo · commit ac3b4b3a7f91 · 2021-12-04T22:47:53.000+08:00
diff --git a/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/JavaManagementExtensions.java b/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/JavaManagementExtensions.java
@@ -0,0 +1,43 @@
+package com.wdbyte.jmx;
+
+import java.lang.management.CompilationMXBean;
+import java.lang.management.GarbageCollectorMXBean;
+import java.lang.management.ManagementFactory;
+import java.lang.management.MemoryMXBean;
+import java.lang.management.MemoryManagerMXBean;
+import java.lang.management.MemoryUsage;
+import java.lang.management.OperatingSystemMXBean;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * JMX JVM
+ *
+ * @author https://www.wdbyte.com
+ */
+public class JavaManagementExtensions {
+
+    public static void main(String[] args) {
+        OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
+        String osName = operatingSystemMXBean.getName();
+        String osVersion = operatingSystemMXBean.getVersion();
+        int processors = operatingSystemMXBean.getAvailableProcessors();
+        System.out.println(String.format("操作系统：%s，版本：%s，处理器：%d 个", osName, osVersion, processors));
+
+        CompilationMXBean compilationMXBean = ManagementFactory.getCompilationMXBean();
+        String compilationMXBeanName = compilationMXBean.getName();
+        System.out.println("编译系统：" + compilationMXBeanName);
+
+        MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
+        MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
+        long max = heapMemoryUsage.getMax();
+        long used = heapMemoryUsage.getUsed();
+        System.out.println(String.format("使用内存：%dMB/%dMB", used / 1024 / 1024, max / 1024 / 1024));
+
+        List<GarbageCollectorMXBean> gcMXBeans = ManagementFactory.getGarbageCollectorMXBeans();
+        String gcNames = gcMXBeans.stream()
+            .map(MemoryManagerMXBean::getName)
+            .collect(Collectors.joining(","));
+        System.out.println("垃圾收集器：" + gcNames);
+    }
+}
diff --git a/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/MyMemory.java b/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/MyMemory.java
@@ -0,0 +1,36 @@
+package com.wdbyte.jmx;
+
+/**
+ * @author https://www.wdbyte.com
+ */
+public class MyMemory implements MyMemoryMBean {
+
+    private long total;
+    private long used;
+
+    @Override
+    public long getTotal() {
+        return total;
+    }
+
+    @Override
+    public void setTotal(long total) {
+        this.total = total;
+    }
+
+    @Override
+    public long getUsed() {
+        return used;
+    }
+
+    @Override
+    public void setUsed(long used) {
+        this.used = used;
+    }
+
+    @Override
+    public String doMemoryInfo() {
+        return String.format("使用内存: %dMB/%dMB", used, total);
+    }
+
+}
diff --git a/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/MyMemoryMBean.java b/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/MyMemoryMBean.java
@@ -0,0 +1,17 @@
+package com.wdbyte.jmx;
+
+/**
+ * @author https://www.wdbyte.com
+ */
+public interface MyMemoryMBean {
+
+    long getTotal();
+
+    void setTotal(long total);
+
+    long getUsed();
+
+    void setUsed(long used);
+
+    String doMemoryInfo();
+}
diff --git a/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/MyMemoryManagement.java b/core-java-modules/core-java-performance/src/main/java/com/wdbyte/jmx/MyMemoryManagement.java
@@ -0,0 +1,34 @@
+package com.wdbyte.jmx;
+
+import java.lang.management.ManagementFactory;
+
+import javax.management.InstanceAlreadyExistsException;
+import javax.management.MBeanRegistrationException;
+import javax.management.MBeanServer;
+import javax.management.MalformedObjectNameException;
+import javax.management.NotCompliantMBeanException;
+import javax.management.ObjectName;
+
+/**
+ * @author https://www.wdbyte.com
+ */
+public class MyMemoryManagement {
+
+    public static void main(String[] args) throws MalformedObjectNameException, NotCompliantMBeanException,
+        InstanceAlreadyExistsException, MBeanRegistrationException, InterruptedException {
+        // 获取 MBean Server
+        MBeanServer platformMBeanServer = ManagementFactory.getPlatformMBeanServer();
+        MyMemory myMemory = new MyMemory();
+        myMemory.setTotal(100L);
+        myMemory.setUsed(20L);
+        // 注册
+        ObjectName objectName = new ObjectName("com.wdbyte.jmx:type=myMemory");
+        platformMBeanServer.registerMBean(myMemory, objectName);
+
+        while (true) {
+            // 防止进行退出
+            Thread.sleep(3000);
+            System.out.println(myMemory.doMemoryInfo());
+        }
+    }
+}
