OAL supports generating metrics from events (#7134)

* OAL supports generating metrics from events

* Add new dashboard for event metrics

* Add some docs for event metrics

CHANGES.md

@@ -37,6 +37,7 @@ Release Notes.
 * Upgrade snake yaml caused by CVE-2017-18640.
 * Upgrade embed tomcat caused by CVE-2020-13935.
 * Upgrade commons-lang3 to avoid potential NPE in some JDK versions.
+* OAL supports generating metrics from events.
 
 #### UI
 

docs/en/concepts-and-designs/event.md

@@ -57,7 +57,7 @@ There are also cases where you would already have both the start time and end ti
 
 ## How to Configure Alarms for Events
 
-Events are derived from metrics, and can be the source to trigger alarms. For example, if a specific event occurs for a
+Events derive from metrics, and can be the source to trigger alarms. For example, if a specific event occurs for a
 certain times in a period, alarms can be triggered and sent.
 
 Every event has a default `value = 1`, when `n` events with the same name are reported, they are aggregated
@@ -101,6 +101,16 @@ For more alarm configuration details, please refer to the [alarm doc](../setup/b
 **Note** that the `Unhealthy` event above is only for demonstration, they are not detected by default in SkyWalking,
 however, you can use the methods in [How to Report Events](#how-to-report-events) to report this kind of events.
 
+## Correlation between events and metrics
+
+SkyWalking UI visualizes the events in the dashboard when the event service / instance / endpoint matches the displayed
+service / instance / endpoint.
+
+By default, SkyWalking also generates some metrics for events by using [OAL](oal.md). The default metrics list of event
+may change over time, you can find the complete list
+in [event.oal](../../../oap-server/server-bootstrap/src/main/resources/oal/event.oal). If you want to generate you
+custom metrics from events, please refer to [OAL](oal.md) about how to write OAL rules.
+
 ## Known Events
 
 | Name | Type | When | Where |

docs/en/concepts-and-designs/scope-definitions.md

@@ -181,7 +181,7 @@ This calculates the metrics data from each request of the page in the browser ap
 
 ### SCOPE `BrowserAppPagePerf`
 
-This calculates the metrics data form each request of the page in the browser application (browser only).
+This calculates the metrics data from each request of the page in the browser application (browser only).
 
 | Name | Remarks | Group Key | Type | 
 |---|---|---|---|
@@ -201,3 +201,17 @@ This calculates the metrics data form each request of the page in the browser ap
 | ttlTime | Time to interact. | | int(in ms) |
 | firstPackTime | First pack time. | | int(in ms) |
 | fmpTime | First Meaningful Paint. | | int(in ms) |
+
+### SCOPE `Event`
+
+This calculates the metrics data from [events](event.md).
+
+| Name | Remarks | Group Key | Type | 
+|---|---|---|---|
+| name | The name of the event. |  | string |
+| service | The service name to which the event belongs to. | | string |
+| serviceInstance | The service instance to which the event belongs to, if any. | | string|
+| endpoint | The service endpoint to which the event belongs to, if any. | | string|
+| type | The type of the event, `Normal` or `Error`. | | string|
+| message | The message of the event. | | string |
+| parameters | The parameters in the `message`, see [parameters](event.md#parameters). | | string |

oap-server/analyzer/event-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/event/EventAnalyzerModuleProvider.java

@@ -20,9 +20,11 @@ package org.apache.skywalking.oap.server.analyzer.event;
 
 import org.apache.skywalking.oap.server.analyzer.event.listener.EventRecordAnalyzerListener;
 import org.apache.skywalking.oap.server.core.CoreModule;
+import org.apache.skywalking.oap.server.core.oal.rt.OALEngineLoaderService;
 import org.apache.skywalking.oap.server.library.module.ModuleConfig;
 import org.apache.skywalking.oap.server.library.module.ModuleDefine;
 import org.apache.skywalking.oap.server.library.module.ModuleProvider;
+import org.apache.skywalking.oap.server.library.module.ModuleStartException;
 import org.apache.skywalking.oap.server.library.module.ServiceNotProvidedException;
 
 public class EventAnalyzerModuleProvider extends ModuleProvider {
@@ -51,7 +53,12 @@ public class EventAnalyzerModuleProvider extends ModuleProvider {
     }
 
     @Override
-    public void start() {
+    public void start() throws ModuleStartException {
+        getManager().find(CoreModule.NAME)
+                    .provider()
+                    .getService(OALEngineLoaderService.class)
+                    .load(EventOALDefine.INSTANCE);
+
         analysisService.add(new EventRecordAnalyzerListener.Factory(getManager()));
     }
 

oap-server/analyzer/event-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/event/EventOALDefine.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.skywalking.oap.server.analyzer.event;
+
+import org.apache.skywalking.oap.server.core.oal.rt.OALDefine;
+
+/**
+ * OAL rules to calculate Event-specific metrics.
+ */
+public class EventOALDefine extends OALDefine {
+    public static final EventOALDefine INSTANCE = new EventOALDefine();
+
+    private EventOALDefine() {
+        super(
+            "oal/event.oal",
+            "org.apache.skywalking.oap.server.core.source"
+        );
+    }
+}

oap-server/analyzer/event-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/event/listener/EventRecordAnalyzerListener.java

@@ -25,7 +25,8 @@ import org.apache.skywalking.oap.server.core.CoreModule;
 import org.apache.skywalking.oap.server.core.analysis.TimeBucket;
 import org.apache.skywalking.oap.server.core.analysis.worker.MetricsStreamProcessor;
 import org.apache.skywalking.oap.server.core.config.NamingControl;
-import org.apache.skywalking.oap.server.core.event.Event;
+import org.apache.skywalking.oap.server.core.source.Event;
+import org.apache.skywalking.oap.server.core.source.SourceReceiver;
 import org.apache.skywalking.oap.server.library.module.ModuleManager;
 
 /**
@@ -37,11 +38,14 @@ public class EventRecordAnalyzerListener implements EventAnalyzerListener {
 
     private final NamingControl namingControl;
 
+    private final SourceReceiver sourceReceiver;
+
     private final Event event = new Event();
 
     @Override
     public void build() {
         MetricsStreamProcessor.getInstance().in(event);
+        sourceReceiver.receive(event);
     }
 
     @Override
@@ -72,16 +76,20 @@ public class EventRecordAnalyzerListener implements EventAnalyzerListener {
 
     public static class Factory implements EventAnalyzerListener.Factory {
         private final NamingControl namingControl;
+        private final SourceReceiver sourceReceiver;
 
         public Factory(final ModuleManager moduleManager) {
             this.namingControl = moduleManager.find(CoreModule.NAME)
                                               .provider()
                                               .getService(NamingControl.class);
+            this.sourceReceiver = moduleManager.find(CoreModule.NAME)
+                                               .provider()
+                                               .getService(SourceReceiver.class);
         }
 
         @Override
         public EventAnalyzerListener create(final ModuleManager moduleManager) {
-            return new EventRecordAnalyzerListener(namingControl);
+            return new EventRecordAnalyzerListener(namingControl, sourceReceiver);
         }
     }
 }

oap-server/oal-grammar/src/main/antlr4/org/apache/skywalking/oal/rt/grammar/OALLexer.g4

@@ -39,6 +39,7 @@ SRC_SERVICE_INSTANCE_CLR_CPU: 'ServiceInstanceCLRCPU';
 SRC_SERVICE_INSTANCE_CLR_GC: 'ServiceInstanceCLRGC';
 SRC_SERVICE_INSTANCE_CLR_THREAD: 'ServiceInstanceCLRThread';
 SRC_ENVOY_INSTANCE_METRIC: 'EnvoyInstanceMetric';
+SRC_EVENT: 'Event';
 
 // Browser keywords
 SRC_BROWSER_APP_PERF: 'BrowserAppPerf';

oap-server/oal-grammar/src/main/antlr4/org/apache/skywalking/oal/rt/grammar/OALParser.g4

@@ -55,7 +55,8 @@ source
       SRC_SERVICE_INSTANCE_CLR_CPU | SRC_SERVICE_INSTANCE_CLR_GC | SRC_SERVICE_INSTANCE_CLR_THREAD |
       SRC_ENVOY_INSTANCE_METRIC |
       SRC_BROWSER_APP_PERF | SRC_BROWSER_APP_PAGE_PERF | SRC_BROWSER_APP_SINGLE_VERSION_PERF |
-      SRC_BROWSER_APP_TRAFFIC | SRC_BROWSER_APP_PAGE_TRAFFIC | SRC_BROWSER_APP_SINGLE_VERSION_TRAFFIC
+      SRC_BROWSER_APP_TRAFFIC | SRC_BROWSER_APP_PAGE_TRAFFIC | SRC_BROWSER_APP_SINGLE_VERSION_TRAFFIC |
+      SRC_EVENT
     ;
 
 disableSource

oap-server/oal-rt/src/main/resources/code-templates/dispatcher/dispatch.ftl

-public void dispatch(org.apache.skywalking.oap.server.core.source.Source source) {
+public void dispatch(org.apache.skywalking.oap.server.core.source.ISource source) {
 ${sourcePackage}${source} _source = (${sourcePackage}${source})source;
 <#list metrics as metrics>
     do${metrics.metricsName}(_source);
 </#list>
-}
+}
\ No newline at end of file

oap-server/oal-rt/src/main/resources/code-templates/dispatcher/doMetrics.ftl

 private void do${metricsName}(${sourcePackage}${sourceName} source) {
-${metricsClassPackage}${metricsName}Metrics metrics = new ${metricsClassPackage}${metricsName}Metrics();
 
 <#if filterExpressions??>
     <#list filterExpressions as filterExpression>
@@ -9,6 +8,7 @@ ${metricsClassPackage}${metricsName}Metrics metrics = new ${metricsClassPackage}
     </#list>
 </#if>
 
+${metricsClassPackage}${metricsName}Metrics metrics = new ${metricsClassPackage}${metricsName}Metrics();
 metrics.setTimeBucket(source.getTimeBucket());
 <#list fieldsFromSource as field>
     metrics.${field.fieldSetter}(source.${field.fieldGetter}());

oap-server/server-bootstrap/src/main/resources/oal/event.oal

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+event_total = from(Event.*).count();
+
+event_normal_count = from(Event.*).filter(type == "Normal").count();
+event_error_count = from(Event.*).filter(type == "Error").count();
+
+event_start_count = from(Event.*).filter(name == "Start").count();
+event_shutdown_count = from(Event.*).filter(name == "Shutdown").count();

oap-server/server-bootstrap/src/main/resources/ui-initialized-templates/event.yml

+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+templates:
+  - name: "Event"
+    type: "DASHBOARD"
+    configuration: |-
+      [
+        {
+          "name": "Event",
+          "type": "service",
+          "children": [
+            {
+              "name": "Global",
+              "children": [
+                {
+                  "width": "3",
+                  "title": "Event Count by Severity",
+                  "height": "280",
+                  "entityType": "All",
+                  "independentSelector": false,
+                  "metricType": "REGULAR_VALUE",
+                  "metricName": "event_total,event_normal_count,event_error_count",
+                  "queryMetricType": "readMetricsValues",
+                  "chartType": "ChartLine"
+                },
+                {
+                  "width": "3",
+                  "title": "Event Count by Lifecycle",
+                  "height": "280",
+                  "entityType": "All",
+                  "independentSelector": false,
+                  "metricType": "REGULAR_VALUE",
+                  "metricName": "event_start_count,event_shutdown_count",
+                  "queryMetricType": "readMetricsValues",
+                  "chartType": "ChartLine"
+                }
+              ]
+            }
+          ]
+        }
+      ]
+    activated: true
+    disabled: false

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/DispatcherManager.java

@@ -29,7 +29,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import org.apache.skywalking.oap.server.core.UnexpectedException;
-import org.apache.skywalking.oap.server.core.source.Source;
+import org.apache.skywalking.oap.server.core.source.ISource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -43,7 +43,7 @@ public class DispatcherManager implements DispatcherDetectorListener {
         this.dispatcherMap = new HashMap<>();
     }
 
-    public void forward(Source source) {
+    public void forward(ISource source) {
         if (source == null) {
             return;
         }
@@ -96,12 +96,12 @@ public class DispatcherManager implements DispatcherDetectorListener {
 
                     Object source = ((Class) argument).newInstance();
 
-                    if (!Source.class.isAssignableFrom(source.getClass())) {
+                    if (!ISource.class.isAssignableFrom(source.getClass())) {
                         throw new UnexpectedException(
                             "unexpected type argument of class " + aClass.getName() + ", should be `org.apache.skywalking.oap.server.core.source.Source`. ");
                     }
 
-                    Source dispatcherSource = (Source) source;
+                    ISource dispatcherSource = (ISource) source;
                     SourceDispatcher dispatcher = (SourceDispatcher) aClass.newInstance();
 
                     int scopeId = dispatcherSource.scope();

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/SourceDispatcher.java

@@ -18,7 +18,7 @@
 
 package org.apache.skywalking.oap.server.core.analysis;
 
-import org.apache.skywalking.oap.server.core.source.Source;
+import org.apache.skywalking.oap.server.core.source.ISource;
 
 /**
  * SourceDispatcher implementation processes different types of the source. There are two kinds of the source
@@ -29,6 +29,6 @@ import org.apache.skywalking.oap.server.core.source.Source;
  *
  * @param <SOURCE> the data type of this dispatcher processes.
  */
-public interface SourceDispatcher<SOURCE extends Source> {
+public interface SourceDispatcher<SOURCE extends ISource> {
     void dispatch(SOURCE source);
 }

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/event/Event.java → oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/Event.java

@@ -16,14 +16,13 @@
  *
  */
 
-package org.apache.skywalking.oap.server.core.event;
+package org.apache.skywalking.oap.server.core.source;
 
 import java.util.HashMap;
 import java.util.Map;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.Setter;
-import org.apache.skywalking.apm.util.StringUtil;
 import org.apache.skywalking.oap.server.core.analysis.IDManager;
 import org.apache.skywalking.oap.server.core.analysis.MetricsExtension;
 import org.apache.skywalking.oap.server.core.analysis.Stream;
@@ -34,12 +33,10 @@ import org.apache.skywalking.oap.server.core.analysis.metrics.MetricsMetaInfo;
 import org.apache.skywalking.oap.server.core.analysis.metrics.WithMetadata;
 import org.apache.skywalking.oap.server.core.analysis.worker.MetricsStreamProcessor;
 import org.apache.skywalking.oap.server.core.remote.grpc.proto.RemoteData;
-import org.apache.skywalking.oap.server.core.source.DefaultScopeDefine;
-import org.apache.skywalking.oap.server.core.source.ScopeDeclaration;
 import org.apache.skywalking.oap.server.core.storage.StorageHashMapBuilder;
 import org.apache.skywalking.oap.server.core.storage.annotation.Column;
-import org.elasticsearch.common.Strings;
 
+import static org.apache.skywalking.apm.util.StringUtil.isNotBlank;
 import static org.apache.skywalking.oap.server.core.source.DefaultScopeDefine.EVENT;
 
 @Getter
@@ -51,7 +48,7 @@ import static org.apache.skywalking.oap.server.core.source.DefaultScopeDefine.EV
     of = "uuid"
 )
 @MetricsExtension(supportDownSampling = false, supportUpdate = true)
-public class Event extends Metrics implements WithMetadata, LongValueHolder {
+public class Event extends Metrics implements ISource, WithMetadata, LongValueHolder {
 
     public static final String INDEX_NAME = "events";
 
@@ -136,13 +133,13 @@ public class Event extends Metrics implements WithMetadata, LongValueHolder {
             setEndTime(event.getEndTime());
         }
 
-        if (StringUtil.isNotBlank(event.getType())) {
+        if (isNotBlank(event.getType())) {
             setType(event.getType());
         }
-        if (StringUtil.isNotBlank(event.getMessage())) {
+        if (isNotBlank(event.getMessage())) {
             setType(event.getMessage());
         }
-        if (StringUtil.isNotBlank(event.getParameters())) {
+        if (isNotBlank(event.getParameters())) {
             setParameters(event.getParameters());
         }
         return true;
@@ -206,16 +203,31 @@ public class Event extends Metrics implements WithMetadata, LongValueHolder {
     @Override
     public MetricsMetaInfo getMeta() {
         int scope = DefaultScopeDefine.SERVICE;
+        if (isNotBlank(getServiceInstance())) {
+            scope = DefaultScopeDefine.SERVICE_INSTANCE;
+        } else if (isNotBlank(getEndpoint())) {
+            scope = DefaultScopeDefine.ENDPOINT;
+        }
+
+        String id = getEntityId();
+        return new MetricsMetaInfo(getName(), scope, id);
+    }
+
+    @Override
+    public int scope() {
+        return EVENT;
+    }
+
+    @Override
+    public String getEntityId() {
         final String serviceId = IDManager.ServiceID.buildId(getService(), true);
         String id = serviceId;
-        if (!Strings.isNullOrEmpty(getServiceInstance())) {
-            scope = DefaultScopeDefine.SERVICE_INSTANCE;
+        if (isNotBlank(getServiceInstance())) {
             id = IDManager.ServiceInstanceID.buildId(serviceId, getServiceInstance());
-        } else if (!Strings.isNullOrEmpty(getEndpoint())) {
-            scope = DefaultScopeDefine.ENDPOINT;
+        } else if (isNotBlank(getEndpoint())) {
             id = IDManager.EndpointID.buildId(serviceId, getEndpoint());
         }
-        return new MetricsMetaInfo(getName(), scope, id);
+        return id;
     }
 
     public static class Builder implements StorageHashMapBuilder<Event> {

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/ISource.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.oap.server.core.source;
+
+public interface ISource {
+    int scope();
+
+    long getTimeBucket();
+
+    void setTimeBucket(long timeBucket);
+
+    String getEntityId();
+
+    /**
+     * Internal data field preparation before {@link org.apache.skywalking.oap.server.core.analysis.SourceDispatcher#dispatch(ISource)}
+     */
+    default void prepare() {
+    }
+}

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/Source.java

@@ -21,19 +21,9 @@ package org.apache.skywalking.oap.server.core.source;
 import lombok.Getter;
 import lombok.Setter;
 
-public abstract class Source {
-    public abstract int scope();
+public abstract class Source implements ISource {
 
     @Getter
     @Setter
     private long timeBucket;
-
-    public abstract String getEntityId();
-
-    /**
-     * Internal data field preparation before {@link org.apache.skywalking.oap.server.core.analysis.SourceDispatcher#dispatch(Source)}
-     */
-    public void prepare() {
-
-    }
 }

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/SourceReceiver.java

@@ -26,7 +26,7 @@ import org.apache.skywalking.oap.server.library.module.Service;
  * in order to forward source to the suitable real {@link org.apache.skywalking.oap.server.core.analysis.SourceDispatcher}.
  */
 public interface SourceReceiver extends Service {
-    void receive(Source source);
+    void receive(ISource source);
 
     DispatcherDetectorListener getDispatcherDetectorListener();
 }

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/SourceReceiverImpl.java

@@ -32,7 +32,7 @@ public class SourceReceiverImpl implements SourceReceiver {
     }
 
     @Override
-    public void receive(Source source) {
+    public void receive(ISource source) {
         dispatcherManager.forward(source);
     }
 

oap-server/server-fetcher-plugin/kafka-fetcher-plugin/src/test/java/org/apache/skywalking/oap/server/analyzer/agent/kafka/provider/handler/ServiceManagementHandlerTest.java

@@ -23,16 +23,16 @@ import org.apache.kafka.clients.consumer.ConsumerRecord;
 import org.apache.kafka.common.utils.Bytes;
 import org.apache.skywalking.apm.network.management.v3.InstancePingPkg;
 import org.apache.skywalking.apm.network.management.v3.InstanceProperties;
+import org.apache.skywalking.oap.server.analyzer.agent.kafka.mock.MockModuleManager;
+import org.apache.skywalking.oap.server.analyzer.agent.kafka.mock.MockModuleProvider;
+import org.apache.skywalking.oap.server.analyzer.agent.kafka.module.KafkaFetcherConfig;
 import org.apache.skywalking.oap.server.core.CoreModule;
 import org.apache.skywalking.oap.server.core.config.NamingControl;
 import org.apache.skywalking.oap.server.core.config.group.EndpointNameGrouping;
+import org.apache.skywalking.oap.server.core.source.ISource;
 import org.apache.skywalking.oap.server.core.source.ServiceInstanceUpdate;
-import org.apache.skywalking.oap.server.core.source.Source;
 import org.apache.skywalking.oap.server.core.source.SourceReceiver;
 import org.apache.skywalking.oap.server.library.module.ModuleManager;
-import org.apache.skywalking.oap.server.analyzer.agent.kafka.mock.MockModuleManager;
-import org.apache.skywalking.oap.server.analyzer.agent.kafka.mock.MockModuleProvider;
-import org.apache.skywalking.oap.server.analyzer.agent.kafka.module.KafkaFetcherConfig;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.ClassRule;
@@ -52,7 +52,7 @@ public class ServiceManagementHandlerTest {
     public static SourceReceiverRule SOURCE_RECEIVER = new SourceReceiverRule() {
 
         @Override
-        protected void verify(final List<Source> sourceList) throws Throwable {
+        protected void verify(final List<ISource> sourceList) throws Throwable {
             ServiceInstanceUpdate instanceUpdate = (ServiceInstanceUpdate) sourceList.get(0);
             Assert.assertEquals(instanceUpdate.getName(), SERVICE_INSTANCE);
 

oap-server/server-fetcher-plugin/kafka-fetcher-plugin/src/test/java/org/apache/skywalking/oap/server/analyzer/agent/kafka/provider/handler/SourceReceiverRule.java

@@ -21,15 +21,15 @@ package org.apache.skywalking.oap.server.analyzer.agent.kafka.provider.handler;
 import com.google.common.collect.Lists;
 import java.util.List;
 import org.apache.skywalking.oap.server.core.analysis.DispatcherDetectorListener;
-import org.apache.skywalking.oap.server.core.source.Source;
+import org.apache.skywalking.oap.server.core.source.ISource;
 import org.apache.skywalking.oap.server.core.source.SourceReceiver;
 import org.junit.rules.Verifier;
 
 public abstract class SourceReceiverRule extends Verifier implements SourceReceiver {
-    private final List<Source> sourceList = Lists.newArrayList();
+    private final List<ISource> sourceList = Lists.newArrayList();
 
     @Override
-    public void receive(final Source source) {
+    public void receive(final ISource source) {
         sourceList.add(source);
     }
 
@@ -38,10 +38,11 @@ public abstract class SourceReceiverRule extends Verifier implements SourceRecei
         return null;
     }
 
+    @Override
     protected void verify() throws Throwable {
         verify(sourceList);
     }
 
-    protected abstract void verify(List<Source> sourceList) throws Throwable;
+    protected abstract void verify(List<ISource> sourceList) throws Throwable;
 
 }

oap-server/server-receiver-plugin/skywalking-trace-receiver-plugin/src/test/java/org/apache/skywalking/oap/server/receiver/trace/provider/parser/listener/MockReceiver.java

@@ -22,7 +22,7 @@ import java.util.ArrayList;
 import java.util.List;
 import lombok.Getter;
 import org.apache.skywalking.oap.server.core.analysis.DispatcherDetectorListener;
-import org.apache.skywalking.oap.server.core.source.Source;
+import org.apache.skywalking.oap.server.core.source.ISource;
 import org.apache.skywalking.oap.server.core.source.SourceReceiver;
 
 /**
@@ -30,10 +30,10 @@ import org.apache.skywalking.oap.server.core.source.SourceReceiver;
  */
 public class MockReceiver implements SourceReceiver {
     @Getter
-    private List<Source> receivedSources = new ArrayList<>();
+    private List<ISource> receivedSources = new ArrayList<>();
 
     @Override
-    public void receive(final Source source) {
+    public void receive(final ISource source) {
         receivedSources.add(source);
     }
 

oap-server/server-receiver-plugin/skywalking-trace-receiver-plugin/src/test/java/org/apache/skywalking/oap/server/receiver/trace/provider/parser/listener/MultiScopesAnalysisListenerTest.java

@@ -43,12 +43,12 @@ import org.apache.skywalking.oap.server.core.source.All;
 import org.apache.skywalking.oap.server.core.source.DatabaseAccess;
 import org.apache.skywalking.oap.server.core.source.Endpoint;
 import org.apache.skywalking.oap.server.core.source.EndpointRelation;
+import org.apache.skywalking.oap.server.core.source.ISource;
 import org.apache.skywalking.oap.server.core.source.Service;
 import org.apache.skywalking.oap.server.core.source.ServiceInstance;
 import org.apache.skywalking.oap.server.core.source.ServiceInstanceRelation;
 import org.apache.skywalking.oap.server.core.source.ServiceMeta;
 import org.apache.skywalking.oap.server.core.source.ServiceRelation;
-import org.apache.skywalking.oap.server.core.source.Source;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
@@ -147,7 +147,7 @@ public class MultiScopesAnalysisListenerTest {
         listener.parseEntry(spanObject, segment);
         listener.build();
 
-        final List<Source> receivedSources = mockReceiver.getReceivedSources();
+        final List<ISource> receivedSources = mockReceiver.getReceivedSources();
         Assert.assertEquals(7, receivedSources.size());
         final All all = (All) receivedSources.get(0);
         final Service service = (Service) receivedSources.get(1);
@@ -212,7 +212,7 @@ public class MultiScopesAnalysisListenerTest {
         listener.parseEntry(spanObject, segment);
         listener.build();
 
-        final List<Source> receivedSources = mockReceiver.getReceivedSources();
+        final List<ISource> receivedSources = mockReceiver.getReceivedSources();
         Assert.assertEquals(7, receivedSources.size());
         final All all = (All) receivedSources.get(0);
         final Service service = (Service) receivedSources.get(1);
@@ -276,7 +276,7 @@ public class MultiScopesAnalysisListenerTest {
         listener.parseEntry(spanObject, segment);
         listener.build();
 
-        final List<Source> receivedSources = mockReceiver.getReceivedSources();
+        final List<ISource> receivedSources = mockReceiver.getReceivedSources();
         Assert.assertEquals(7, receivedSources.size());
         final All all = (All) receivedSources.get(0);
         final Service service = (Service) receivedSources.get(1);
@@ -332,7 +332,7 @@ public class MultiScopesAnalysisListenerTest {
         listener.parseLocal(spanObject, segment);
         listener.build();
 
-        final List<Source> receivedSources = mockReceiver.getReceivedSources();
+        final List<ISource> receivedSources = mockReceiver.getReceivedSources();
         Assert.assertEquals(1, receivedSources.size());
         final Endpoint source = (Endpoint) receivedSources.get(0);
         Assert.assertEquals("/logic-call", source.getName());
@@ -377,7 +377,7 @@ public class MultiScopesAnalysisListenerTest {
         listener.parseLocal(spanObject, segment);
         listener.build();
 
-        final List<Source> receivedSources = mockReceiver.getReceivedSources();
+        final List<ISource> receivedSources = mockReceiver.getReceivedSources();
         Assert.assertEquals(1, receivedSources.size());
         final Endpoint source = (Endpoint) receivedSources.get(0);
         Assert.assertEquals("/GraphQL-service", source.getName());
@@ -416,7 +416,7 @@ public class MultiScopesAnalysisListenerTest {
         listener.parseExit(spanObject, segment);
         listener.build();
 
-        final List<Source> receivedSources = mockReceiver.getReceivedSources();
+        final List<ISource> receivedSources = mockReceiver.getReceivedSources();
         Assert.assertEquals(4, receivedSources.size());
         final ServiceRelation serviceRelation = (ServiceRelation) receivedSources.get(0);
         final ServiceInstanceRelation serviceInstanceRelation = (ServiceInstanceRelation) receivedSources.get(1);
@@ -462,7 +462,7 @@ public class MultiScopesAnalysisListenerTest {
         listener.parseExit(spanObject, segment);
         listener.build();
 
-        final List<Source> receivedSources = mockReceiver.getReceivedSources();
+        final List<ISource> receivedSources = mockReceiver.getReceivedSources();
         Assert.assertEquals(2, receivedSources.size());
         final ServiceRelation serviceRelation = (ServiceRelation) receivedSources.get(0);
         final ServiceInstanceRelation serviceInstanceRelation = (ServiceInstanceRelation) receivedSources.get(1);

oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/query/ESEventQueryDAO.java

@@ -23,7 +23,7 @@ import java.util.List;
 import java.util.Objects;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
-import org.apache.skywalking.oap.server.core.event.Event;
+import org.apache.skywalking.oap.server.core.source.Event;
 import org.apache.skywalking.oap.server.core.query.enumeration.Order;
 import org.apache.skywalking.oap.server.core.query.input.Duration;
 import org.apache.skywalking.oap.server.core.query.type.event.EventQueryCondition;

oap-server/server-storage-plugin/storage-elasticsearch7-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch7/query/ES7EventQueryDAO.java

@@ -22,7 +22,7 @@ import java.io.IOException;
 import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
-import org.apache.skywalking.oap.server.core.event.Event;
+import org.apache.skywalking.oap.server.core.source.Event;
 import org.apache.skywalking.oap.server.core.query.type.event.EventQueryCondition;
 import org.apache.skywalking.oap.server.core.query.type.event.Events;
 import org.apache.skywalking.oap.server.library.client.elasticsearch.ElasticSearchClient;

oap-server/server-storage-plugin/storage-influxdb-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/influxdb/query/EventQueryDAO.java

@@ -26,7 +26,7 @@ import java.util.Map;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.skywalking.oap.server.core.event.Event;
+import org.apache.skywalking.oap.server.core.source.Event;
 import org.apache.skywalking.oap.server.core.query.enumeration.Order;
 import org.apache.skywalking.oap.server.core.query.input.Duration;
 import org.apache.skywalking.oap.server.core.query.type.event.EventQueryCondition;

oap-server/server-storage-plugin/storage-jdbc-hikaricp-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/jdbc/h2/dao/H2EventQueryDAO.java

@@ -28,7 +28,7 @@ import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.skywalking.oap.server.core.event.Event;
+import org.apache.skywalking.oap.server.core.source.Event;
 import org.apache.skywalking.oap.server.core.query.input.Duration;
 import org.apache.skywalking.oap.server.core.query.type.event.EventQueryCondition;
 import org.apache.skywalking.oap.server.core.query.type.event.EventType;

oap-server/server-tools/profile-exporter/tool-profile-snapshot-server-mock/src/main/java/org/apache/skywalking/oap/server/tool/profile/core/mock/MockSourceReceiver.java

@@ -19,7 +19,7 @@
 package org.apache.skywalking.oap.server.tool.profile.core.mock;
 
 import org.apache.skywalking.oap.server.core.analysis.DispatcherDetectorListener;
-import org.apache.skywalking.oap.server.core.source.Source;
+import org.apache.skywalking.oap.server.core.source.ISource;
 import org.apache.skywalking.oap.server.core.source.SourceReceiver;
 
 /**
@@ -27,7 +27,7 @@ import org.apache.skywalking.oap.server.core.source.SourceReceiver;
  */
 public class MockSourceReceiver implements SourceReceiver {
     @Override
-    public void receive(Source source) {
+    public void receive(ISource source) {
     }
 
     @Override