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本文主要研究一下skywalking的jvm-receiver-plugin

JVMModuleProvider

skywalking-6.6.0/oap-server/server-receiver-plugin/skywalking-jvm-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/jvm/provider/JVMModuleProvider.java

public class JVMModuleProvider extends ModuleProvider {

    @Override public String name() {
        return "default";
    }

    @Override public Class<? extends ModuleDefine> module() {
        return JVMModule.class;
    }

    @Override public ModuleConfig createConfigBeanIfAbsent() {
        return null;
    }

    @Override public void prepare() {
    }

    @Override public void start() {
        GRPCHandlerRegister grpcHandlerRegister = getManager().find(SharingServerModule.NAME).provider().getService(GRPCHandlerRegister.class);
        grpcHandlerRegister.addHandler(new JVMMetricsServiceHandler(getManager()));
        grpcHandlerRegister.addHandler(new JVMMetricReportServiceHandler(getManager()));
    }

    @Override public void notifyAfterCompleted() {

    }

    @Override public String[] requiredModules() {
        return new String[] {CoreModule.NAME, SharingServerModule.NAME};
    }
}

• JVMModuleProvider繼承了ModuleProvider颜及，其start方法獲取grpcHandlerRegister然后添加JVMMetricsServiceHandler好芭、JVMMetricReportServiceHandler

JVMMetricsService.proto

skywalking-6.6.0/apm-protocol/apm-network/src/main/proto/language-agent/JVMMetricsService.proto

syntax = "proto3";

option java_multiple_files = true;
option java_package = "org.apache.skywalking.apm.network.language.agent";
option csharp_namespace = "SkyWalking.NetworkProtocol";

import "language-agent/Downstream.proto";
import "common/JVM.proto";

service JVMMetricsService {
    rpc collect (JVMMetrics) returns (Downstream) {
    }
}

message JVMMetrics {
    repeated JVMMetric metrics = 1;
    int32 applicationInstanceId = 2;
}

• JVMMetricsService.proto定義了JVMMetricsService服務(wù)倍啥，它有一個collect方法接收JVMMetrics類型的參數(shù)

JVMMetricsServiceHandler

skywalking-6.6.0/oap-server/server-receiver-plugin/skywalking-jvm-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/jvm/provider/handler/JVMMetricsServiceHandler.java

public class JVMMetricsServiceHandler extends JVMMetricsServiceGrpc.JVMMetricsServiceImplBase implements GRPCHandler {

    private static final Logger logger = LoggerFactory.getLogger(JVMMetricsServiceHandler.class);

    private final JVMSourceDispatcher jvmSourceDispatcher;

    public JVMMetricsServiceHandler(ModuleManager moduleManager) {
        this.jvmSourceDispatcher = new JVMSourceDispatcher(moduleManager);
    }

    @Override public void collect(JVMMetrics request, StreamObserver<Downstream> responseObserver) {
        int serviceInstanceId = request.getApplicationInstanceId();

        if (logger.isDebugEnabled()) {
            logger.debug("receive the jvm metrics from service instance, id: {}", serviceInstanceId);
        }

        request.getMetricsList().forEach(metrics -> {
            long minuteTimeBucket = TimeBucket.getMinuteTimeBucket(metrics.getTime());
            jvmSourceDispatcher.sendMetric(serviceInstanceId, minuteTimeBucket, metrics);
        });

        responseObserver.onNext(Downstream.newBuilder().build());
        responseObserver.onCompleted();
    }

}

• JVMMetricsServiceHandler繼承了JVMMetricsServiceGrpc.JVMMetricsServiceImplBase帜慢，其構(gòu)造器創(chuàng)建JVMSourceDispatcher裙盾；其collect方法遍歷request.getMetricsList()挨個執(zhí)行jvmSourceDispatcher.sendMetric(serviceInstanceId, minuteTimeBucket, metrics)

JVMMetric.proto

skywalking-6.6.0/apm-protocol/apm-network/src/main/proto/language-agent-v2/JVMMetric.proto

syntax = "proto3";

option java_multiple_files = true;
option java_package = "org.apache.skywalking.apm.network.language.agent.v2";
option csharp_namespace = "SkyWalking.NetworkProtocol";

import "common/common.proto";
import "common/JVM.proto";

service JVMMetricReportService {
    rpc collect (JVMMetricCollection) returns (Commands) {
    }
}

message JVMMetricCollection {
    repeated JVMMetric metrics = 1;
    int32 serviceInstanceId = 2;
}

• JVMMetric.proto定義了JVMMetricReportService服務(wù)，它有一個collect方法接收JVMMetricCollection類型的參數(shù)

JVMMetricReportServiceHandler

skywalking-6.6.0/oap-server/server-receiver-plugin/skywalking-jvm-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/jvm/provider/handler/JVMMetricReportServiceHandler.java

public class JVMMetricReportServiceHandler extends JVMMetricReportServiceGrpc.JVMMetricReportServiceImplBase implements GRPCHandler {

    private static final Logger logger = LoggerFactory.getLogger(JVMMetricReportServiceHandler.class);

    private final JVMSourceDispatcher jvmSourceDispatcher;

    public JVMMetricReportServiceHandler(ModuleManager moduleManager) {
        this.jvmSourceDispatcher = new JVMSourceDispatcher(moduleManager);
    }

    @Override public void collect(JVMMetricCollection request, StreamObserver<Commands> responseObserver) {
        int serviceInstanceId = request.getServiceInstanceId();

        if (logger.isDebugEnabled()) {
            logger.debug("receive the jvm metrics from service instance, id: {}", serviceInstanceId);
        }

        request.getMetricsList().forEach(metrics -> {
            long minuteTimeBucket = TimeBucket.getMinuteTimeBucket(metrics.getTime());
            jvmSourceDispatcher.sendMetric(serviceInstanceId, minuteTimeBucket, metrics);
        });

        responseObserver.onNext(Commands.newBuilder().build());
        responseObserver.onCompleted();
    }

}

• JVMMetricReportServiceHandler繼承了JVMMetricReportServiceGrpc.JVMMetricReportServiceImplBase隘弊，其構(gòu)造器創(chuàng)建JVMSourceDispatcher拱镐；其collect方法遍歷request.getMetricsList()挨個執(zhí)行jvmSourceDispatcher.sendMetric(serviceInstanceId, minuteTimeBucket, metrics)

JVMSourceDispatcher

skywalking-6.6.0/oap-server/server-receiver-plugin/skywalking-jvm-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/jvm/provider/handler/JVMSourceDispatcher.java

public class JVMSourceDispatcher {
    private static final Logger logger = LoggerFactory.getLogger(JVMSourceDispatcher.class);
    private final SourceReceiver sourceReceiver;
    private final ServiceInstanceInventoryCache instanceInventoryCache;

    public JVMSourceDispatcher(ModuleManager moduleManager) {
        this.sourceReceiver = moduleManager.find(CoreModule.NAME).provider().getService(SourceReceiver.class);
        this.instanceInventoryCache = moduleManager.find(CoreModule.NAME).provider().getService(ServiceInstanceInventoryCache.class);
    }

    void sendMetric(int serviceInstanceId, long minuteTimeBucket, JVMMetric metrics) {
        ServiceInstanceInventory serviceInstanceInventory = instanceInventoryCache.get(serviceInstanceId);
        int serviceId;
        if (Objects.nonNull(serviceInstanceInventory)) {
            serviceId = serviceInstanceInventory.getServiceId();
        } else {
            logger.warn("Can't find service by service instance id from cache, service instance id is: {}", serviceInstanceId);
            return;
        }

        this.sendToCpuMetricProcess(serviceId, serviceInstanceId, minuteTimeBucket, metrics.getCpu());
        this.sendToMemoryMetricProcess(serviceId, serviceInstanceId, minuteTimeBucket, metrics.getMemoryList());
        this.sendToMemoryPoolMetricProcess(serviceId, serviceInstanceId, minuteTimeBucket, metrics.getMemoryPoolList());
        this.sendToGCMetricProcess(serviceId, serviceInstanceId, minuteTimeBucket, metrics.getGcList());
    }

    private void sendToCpuMetricProcess(int serviceId, int serviceInstanceId, long timeBucket, CPU cpu) {
        ServiceInstanceJVMCPU serviceInstanceJVMCPU = new ServiceInstanceJVMCPU();
        serviceInstanceJVMCPU.setId(serviceInstanceId);
        serviceInstanceJVMCPU.setName(Const.EMPTY_STRING);
        serviceInstanceJVMCPU.setServiceId(serviceId);
        serviceInstanceJVMCPU.setServiceName(Const.EMPTY_STRING);
        serviceInstanceJVMCPU.setUsePercent(cpu.getUsagePercent());
        serviceInstanceJVMCPU.setTimeBucket(timeBucket);
        sourceReceiver.receive(serviceInstanceJVMCPU);
    }

    private void sendToGCMetricProcess(int serviceId, int serviceInstanceId, long timeBucket, List<GC> gcs) {
        gcs.forEach(gc -> {
            ServiceInstanceJVMGC serviceInstanceJVMGC = new ServiceInstanceJVMGC();
            serviceInstanceJVMGC.setId(serviceInstanceId);
            serviceInstanceJVMGC.setName(Const.EMPTY_STRING);
            serviceInstanceJVMGC.setServiceId(serviceId);
            serviceInstanceJVMGC.setServiceName(Const.EMPTY_STRING);

            switch (gc.getPhrase()) {
                case NEW:
                    serviceInstanceJVMGC.setPhrase(GCPhrase.NEW);
                    break;
                case OLD:
                    serviceInstanceJVMGC.setPhrase(GCPhrase.OLD);
                    break;
            }

            serviceInstanceJVMGC.setTime(gc.getTime());
            serviceInstanceJVMGC.setCount(gc.getCount());
            serviceInstanceJVMGC.setTimeBucket(timeBucket);
            sourceReceiver.receive(serviceInstanceJVMGC);
        });
    }

    private void sendToMemoryMetricProcess(int serviceId, int serviceInstanceId, long timeBucket,
        List<Memory> memories) {
        memories.forEach(memory -> {
            ServiceInstanceJVMMemory serviceInstanceJVMMemory = new ServiceInstanceJVMMemory();
            serviceInstanceJVMMemory.setId(serviceInstanceId);
            serviceInstanceJVMMemory.setName(Const.EMPTY_STRING);
            serviceInstanceJVMMemory.setServiceId(serviceId);
            serviceInstanceJVMMemory.setServiceName(Const.EMPTY_STRING);
            serviceInstanceJVMMemory.setHeapStatus(memory.getIsHeap());
            serviceInstanceJVMMemory.setInit(memory.getInit());
            serviceInstanceJVMMemory.setMax(memory.getMax());
            serviceInstanceJVMMemory.setUsed(memory.getUsed());
            serviceInstanceJVMMemory.setCommitted(memory.getCommitted());
            serviceInstanceJVMMemory.setTimeBucket(timeBucket);
            sourceReceiver.receive(serviceInstanceJVMMemory);
        });
    }

    private void sendToMemoryPoolMetricProcess(int serviceId, int serviceInstanceId, long timeBucket,
        List<MemoryPool> memoryPools) {

        memoryPools.forEach(memoryPool -> {
            ServiceInstanceJVMMemoryPool serviceInstanceJVMMemoryPool = new ServiceInstanceJVMMemoryPool();
            serviceInstanceJVMMemoryPool.setId(serviceInstanceId);
            serviceInstanceJVMMemoryPool.setName(Const.EMPTY_STRING);
            serviceInstanceJVMMemoryPool.setServiceId(serviceId);
            serviceInstanceJVMMemoryPool.setServiceName(Const.EMPTY_STRING);

            switch (memoryPool.getType()) {
                case NEWGEN_USAGE:
                    serviceInstanceJVMMemoryPool.setPoolType(MemoryPoolType.NEWGEN_USAGE);
                    break;
                case OLDGEN_USAGE:
                    serviceInstanceJVMMemoryPool.setPoolType(MemoryPoolType.OLDGEN_USAGE);
                    break;
                case PERMGEN_USAGE:
                    serviceInstanceJVMMemoryPool.setPoolType(MemoryPoolType.PERMGEN_USAGE);
                    break;
                case SURVIVOR_USAGE:
                    serviceInstanceJVMMemoryPool.setPoolType(MemoryPoolType.SURVIVOR_USAGE);
                    break;
                case METASPACE_USAGE:
                    serviceInstanceJVMMemoryPool.setPoolType(MemoryPoolType.METASPACE_USAGE);
                    break;
                case CODE_CACHE_USAGE:
                    serviceInstanceJVMMemoryPool.setPoolType(MemoryPoolType.CODE_CACHE_USAGE);
                    break;
            }

            serviceInstanceJVMMemoryPool.setInit(memoryPool.getInit());
            serviceInstanceJVMMemoryPool.setMax(memoryPool.getMax());
            serviceInstanceJVMMemoryPool.setUsed(memoryPool.getUsed());
            serviceInstanceJVMMemoryPool.setCommitted(memoryPool.getCommited());
            serviceInstanceJVMMemoryPool.setTimeBucket(timeBucket);
            sourceReceiver.receive(serviceInstanceJVMMemoryPool);
        });
    }
}

• JVMSourceDispatcher主要是提供了sendMetric方法，該方法執(zhí)行sendToCpuMetricProcess饰豺、sendToMemoryMetricProcess亿鲜、sendToMemoryPoolMetricProcess、sendToGCMetricProcess方法冤吨；sendToCpuMetricProcess方法執(zhí)行sourceReceiver.receive(serviceInstanceJVMCPU)蒿柳；sendToMemoryMetricProcess方法執(zhí)行sourceReceiver.receive(serviceInstanceJVMMemory)；sendToMemoryPoolMetricProcess方法執(zhí)行sourceReceiver.receive(serviceInstanceJVMMemoryPool)漩蟆；sendToGCMetricProcess方法執(zhí)行sourceReceiver.receive(serviceInstanceJVMGC)

小結(jié)

JVMModuleProvider繼承了ModuleProvider垒探，其start方法獲取grpcHandlerRegister然后添加JVMMetricsServiceHandler、JVMMetricReportServiceHandler怠李；前者使用的是JVMMetricsService.proto圾叼，后者使用的是agent-v2的JVMMetric.proto

doc

• JVMModuleProvider
• JVMMetricsServiceHandler
• JVMMetricReportServiceHandler