skywalking源码分析第十六篇一agent端JVMService之度量上报

文章目录

• ​​原理图​​
• ​​原理图一基于MXBean进行Metrics数据收集​​
• ​​源码分析一JVMService​​
• ​​总结​​

原理图

• 通过prepare构建Metrics存储缓冲队列 初始化grpc客户端
• 通过boot启动两个定时任务进行数据收集和发送

原理图一基于MXBean进行Metrics数据收集

源码分析一JVMService

• prepare 初始化队列和sender
• boot启动定时任务
• run方法通过MxBean获取指标信息
• Sender.run发送队列中的指标到服务端

public class JVMService implements BootService, Runnable {
    private LinkedBlockingQueue<JVMMetric> queue;
    private Sender sender;

    @Override
    public void prepare() throws Throwable {
        初始化队列和sender
        queue = new LinkedBlockingQueue<JVMMetric>(Config.Jvm.BUFFER_SIZE);
        sender = new Sender();
        ServiceManager.INSTANCE.findService(GRPCChannelManager.class).addChannelListener(sender);
    }

    @Override
    public void boot() throws Throwable {
        启动定时任务,period=1s,收集Metrics数据
        collectMetricFuture = Executors
            .newSingleThreadScheduledExecutor(new DefaultNamedThreadFactory("JVMService-produce"))
            .scheduleAtFixedRate(new RunnableWithExceptionProtection(this, new RunnableWithExceptionProtection.CallbackWhenException() {
                @Override public void handle(Throwable t) {
                    logger.error("JVMService produces metrics failure.", t);
                }
            }), 0, 1, TimeUnit.SECONDS);
        启动定时任务,period=1s,发送Metrics数据
        sendMetricFuture = Executors
            .newSingleThreadScheduledExecutor(new DefaultNamedThreadFactory("JVMService-consume"))
            .scheduleAtFixedRate(new RunnableWithExceptionProtection(sender, new RunnableWithExceptionProtection.CallbackWhenException() {
                @Override public void handle(Throwable t) {
                    logger.error("JVMService consumes and upload failure.", t);
                }
            }
            ), 0, 1, TimeUnit.SECONDS);
    }

    @Override
    public void run() {
        收集数据
        if (RemoteDownstreamConfig.Agent.SERVICE_ID != DictionaryUtil.nullValue()
            && RemoteDownstreamConfig.Agent.SERVICE_INSTANCE_ID != DictionaryUtil.nullValue()
        ) {
            long currentTimeMillis = System.currentTimeMillis();
            MBean MxBean获取指标信息
            JVMMetric.Builder jvmBuilder = JVMMetric.newBuilder();
            通过Provider提取数据, Provider通过mxBean提取数据
            jvmBuilder.setTime(currentTimeMillis);
            jvmBuilder.setCpu(CPUProvider.INSTANCE.getCpuMetric());
            jvmBuilder.addAllMemory(MemoryProvider.INSTANCE.getMemoryMetricList());
            jvmBuilder.addAllMemoryPool(MemoryPoolProvider.INSTANCE.getMemoryPoolMetricsList());
            jvmBuilder.addAllGc(GCProvider.INSTANCE.getGCList());
            添加到缓冲区
            JVMMetric jvmMetric = jvmBuilder.build();
            缓冲区装不下则丢弃之前的数据
            if (!queue.offer(jvmMetric)) {
                queue.poll();
                queue.offer(jvmMetric);
            }
        }
    }

    private class Sender implements Runnable, GRPCChannelListener {
        private volatile GRPCChannelStatus status = GRPCChannelStatus.DISCONNECT;
        private volatile JVMMetricReportServiceGrpc.JVMMetricReportServiceBlockingStub stub = null;

        @Override
        public void run() {
            ...... 删除其他代码
            JVMMetricCollection.Builder builder = JVMMetricCollection.newBuilder();
            LinkedList<JVMMetric> buffer = new LinkedList<JVMMetric>();
            queue.drainTo(buffer);
            // 上报服务端度量信息
            if (buffer.size() > 0) {
                builder.addAllMetrics(buffer);
                builder.setServiceInstanceId(RemoteDownstreamConfig.Agent.SERVICE_INSTANCE_ID);
                Commands commands = stub.withDeadlineAfter(GRPC_UPSTREAM_TIMEOUT, TimeUnit.SECONDS).collect(builder.build());
                // CommandService接收响应处理回调
                ServiceManager.INSTANCE.findService(CommandService.class).receiveCommand(commands);
            }
        }
    }
}

总结

• JVMService的核心: 通过MXBean提取信息构建Metrics