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@Component
public class MemoryMonitor {
private ScheduledExecutorService scheduler;
@PostConstruct
public void init() {
scheduler = Executors.newScheduledThreadPool(1);
scheduler.scheduleAtFixedRate(this::monitorMemory, 0, 5, TimeUnit.SECONDS);
}
public void monitorMemory() {
MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();
Runtime runtime = Runtime.getRuntime();
MemoryUsage heapUsage = memoryBean.getHeapMemoryUsage();
double heapUsagePercent = (double) heapUsage.getUsed() / heapUsage.getMax() * 100;
MemoryUsage nonHeapUsage = memoryBean.getNonHeapMemoryUsage();
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
recordMetrics(heapUsage, nonHeapUsage, pools, heapUsagePercent);
checkMemoryAlerts(heapUsagePercent, heapUsage);
}
private void recordMetrics(MemoryUsage heapUsage, MemoryUsage nonHeapUsage,
List<MemoryPoolMXBean> pools, double heapUsagePercent) {
recordMetric("jvm.memory.heap.used", heapUsage.getUsed());
recordMetric("jvm.memory.heap.max", heapUsage.getMax());
recordMetric("jvm.memory.heap.used.percent", heapUsagePercent);
recordMetric("jvm.memory.nonheap.used", nonHeapUsage.getUsed());
recordMetric("jvm.memory.nonheap.max", nonHeapUsage.getMax());
for (MemoryPoolMXBean pool : pools) {
String poolName = pool.getName();
MemoryUsage usage = pool.getUsage();
recordMetric("jvm.memory.pool.used", usage.getUsed(),
"pool", poolName);
recordMetric("jvm.memory.pool.max", usage.getMax(),
"pool", poolName);
}
}
private void checkMemoryAlerts(double heapUsagePercent, MemoryUsage heapUsage) {
if (heapUsagePercent > 90) {
sendAlert("CRITICAL",
String.format("堆内存使用率过高: %.2f%%", heapUsagePercent));
} else if (heapUsagePercent > 80) {
sendAlert("WARNING",
String.format("堆内存使用率较高: %.2f%%", heapUsagePercent));
}
long availableMemory = heapUsage.getMax() - heapUsage.getUsed();
long availableMB = availableMemory / (1024 * 1024);
if (availableMB < 200) {
sendAlert("WARNING",
String.format("可用堆内存不足: %d MB", availableMB));
}
}
private void recordMetric(String name, long value, String... tags) {
}
private void sendAlert(String level, String message) {
log.warn("[{}] {}", level, message);
}
public MemoryReport getMemoryReport() {
MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();
Runtime runtime = Runtime.getRuntime();
MemoryUsage heapUsage = memoryBean.getHeapMemoryUsage();
MemoryUsage nonHeapUsage = memoryBean.getNonHeapMemoryUsage();
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
List<PoolMemoryInfo> poolInfos = pools.stream()
.map(pool -> {
MemoryUsage usage = pool.getUsage();
return PoolMemoryInfo.builder()
.name(pool.getName())
.type(pool.getType().toString())
.used(usage.getUsed())
.committed(usage.getCommitted())
.max(usage.getMax())
.usagePercent(usage.getMax() > 0 ?
(double) usage.getUsed() / usage.getMax() * 100 : 0)
.build();
})
.collect(Collectors.toList());
return MemoryReport.builder()
.heapUsed(heapUsage.getUsed())
.heapMax(heapUsage.getMax())
.heapUsagePercent((double) heapUsage.getUsed() / heapUsage.getMax() * 100)
.nonHeapUsed(nonHeapUsage.getUsed())
.nonHeapMax(nonHeapUsage.getMax())
.pools(poolInfos)
.timestamp(System.currentTimeMillis())
.build();
}
}
@Data
@Builder
class MemoryReport {
private long heapUsed;
private long heapMax;
private double heapUsagePercent;
private long nonHeapUsed;
private long nonHeapMax;
private List<PoolMemoryInfo> pools;
private long timestamp;
}
@Data
@Builder
class PoolMemoryInfo {
private String name;
private String type;
private long used;
private long committed;
private long max;
private double usagePercent;
}
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