Remove custom scope manager support (#8164)

* chore(ot): Remove custom scope manager support
* chore(core): Remove custom scope manager support

Author: PerfectSlayer

dd-trace-core/src/main/java/datadog/trace/core/CoreTracer.java

@@ -51,7 +51,6 @@
 import datadog.trace.bootstrap.instrumentation.api.AgentHistogram;
 import datadog.trace.bootstrap.instrumentation.api.AgentPropagation;
 import datadog.trace.bootstrap.instrumentation.api.AgentScope;
-import datadog.trace.bootstrap.instrumentation.api.AgentScopeManager;
 import datadog.trace.bootstrap.instrumentation.api.AgentSpan;
 import datadog.trace.bootstrap.instrumentation.api.AgentSpanLink;
 import datadog.trace.bootstrap.instrumentation.api.AgentTracer;
@@ -165,7 +164,7 @@ public static CoreTracerBuilder builder() {
   /** Sampler defines the sampling policy in order to reduce the number of traces for instance */
   final Sampler initialSampler;
   /** Scope manager is in charge of managing the scopes from which spans are created */
-  final AgentScopeManager scopeManager;
+  final ContinuableScopeManager scopeManager;
 
   final MetricsAggregator metricsAggregator;
 
@@ -295,7 +294,7 @@ public static class CoreTracerBuilder {
     private SingleSpanSampler singleSpanSampler;
     private HttpCodec.Injector injector;
     private HttpCodec.Extractor extractor;
-    private AgentScopeManager scopeManager;
+    private ContinuableScopeManager scopeManager;
     private Map<String, ?> localRootSpanTags;
     private Map<String, ?> defaultSpanTags;
     private Map<String, String> serviceNameMappings;
@@ -356,11 +355,6 @@ public CoreTracerBuilder extractor(HttpCodec.Extractor extractor) {
       return this;
     }
 
-    public CoreTracerBuilder scopeManager(AgentScopeManager scopeManager) {
-      this.scopeManager = scopeManager;
-      return this;
-    }
-
     public CoreTracerBuilder localRootSpanTags(Map<String, ?> localRootSpanTags) {
       this.localRootSpanTags = tryMakeImmutableMap(localRootSpanTags);
       return this;
@@ -497,7 +491,6 @@ public CoreTracer build() {
           singleSpanSampler,
           injector,
           extractor,
-          scopeManager,
           localRootSpanTags,
           defaultSpanTags,
           serviceNameMappings,
@@ -529,7 +522,6 @@ private CoreTracer(
       final SingleSpanSampler singleSpanSampler,
       final HttpCodec.Injector injector,
       final HttpCodec.Extractor extractor,
-      final AgentScopeManager scopeManager,
       final Map<String, ?> localRootSpanTags,
       final Map<String, ?> defaultSpanTags,
       final Map<String, String> serviceNameMappings,
@@ -632,16 +624,13 @@ private CoreTracer(
             : Monitoring.DISABLED;
 
     traceWriteTimer = performanceMonitoring.newThreadLocalTimer("trace.write");
-    if (scopeManager == null) {
-      this.scopeManager =
-          new ContinuableScopeManager(
-              config.getScopeDepthLimit(),
-              config.isScopeStrictMode(),
-              profilingContextIntegration,
-              healthMetrics);
-    } else {
-      this.scopeManager = scopeManager;
-    }
+
+    scopeManager =
+        new ContinuableScopeManager(
+            config.getScopeDepthLimit(),
+            config.isScopeStrictMode(),
+            profilingContextIntegration,
+            healthMetrics);
 
     externalAgentLauncher = new ExternalAgentLauncher(config);
 
@@ -1108,9 +1097,7 @@ public DataStreamsCheckpointer getDataStreamsCheckpointer() {
 
   @Override
   public void addScopeListener(final ScopeListener listener) {
-    if (scopeManager instanceof ContinuableScopeManager) {
-      ((ContinuableScopeManager) scopeManager).addScopeListener(listener);
-    }
+    this.scopeManager.addScopeListener(listener);
   }
 
   @Override

dd-trace-core/src/main/java/datadog/trace/core/scopemanager/ContinuableScopeManager.java

@@ -11,13 +11,13 @@
 import datadog.trace.api.scopemanager.ExtendedScopeListener;
 import datadog.trace.api.scopemanager.ScopeListener;
 import datadog.trace.bootstrap.instrumentation.api.AgentScope;
-import datadog.trace.bootstrap.instrumentation.api.AgentScopeManager;
 import datadog.trace.bootstrap.instrumentation.api.AgentSpan;
 import datadog.trace.bootstrap.instrumentation.api.AgentTracer;
 import datadog.trace.bootstrap.instrumentation.api.ProfilerContext;
 import datadog.trace.bootstrap.instrumentation.api.ProfilingContextIntegration;
 import datadog.trace.bootstrap.instrumentation.api.ScopeSource;
 import datadog.trace.bootstrap.instrumentation.api.ScopeState;
+import datadog.trace.bootstrap.instrumentation.api.ScopeStateAware;
 import datadog.trace.core.monitor.HealthMetrics;
 import datadog.trace.relocate.api.RatelimitedLogger;
 import datadog.trace.util.AgentTaskScheduler;
@@ -37,7 +37,7 @@
  * from being reported even if all related spans are finished. It also delegates to other
  * ScopeInterceptors to provide additional functionality.
  */
-public final class ContinuableScopeManager implements AgentScopeManager {
+public final class ContinuableScopeManager implements ScopeStateAware {
   static final Logger log = LoggerFactory.getLogger(ContinuableScopeManager.class);
   static final RatelimitedLogger ratelimitedLog = new RatelimitedLogger(log, 1, MINUTES);
   static final long iterationKeepAlive =
@@ -81,18 +81,15 @@ public ContinuableScopeManager(
     this.profilingContextIntegration = profilingContextIntegration;
   }
 
-  @Override
   public AgentScope activate(final AgentSpan span, final ScopeSource source) {
     return activate(span, source.id(), false, /* ignored */ false);
   }
 
-  @Override
   public AgentScope activate(
       final AgentSpan span, final ScopeSource source, boolean isAsyncPropagating) {
     return activate(span, source.id(), true, isAsyncPropagating);
   }
 
-  @Override
   public AgentScope.Continuation captureSpan(final AgentSpan span) {
     AbstractContinuation continuation =
         new SingleContinuation(this, span, ScopeSource.INSTRUMENTATION.id());
@@ -170,7 +167,6 @@ ContinuableScope continueSpan(
     return scope;
   }
 
-  @Override
   public void closePrevious(final boolean finishSpan) {
     ScopeStack scopeStack = scopeStack();
 
@@ -189,7 +185,6 @@ public void closePrevious(final boolean finishSpan) {
     }
   }
 
-  @Override
   public AgentScope activateNext(final AgentSpan span) {
     ScopeStack scopeStack = scopeStack();
 
@@ -220,12 +215,10 @@ public AgentScope activateNext(final AgentSpan span) {
     return scope;
   }
 
-  @Override
   public AgentScope active() {
     return scopeStack().active();
   }
 
-  @Override
   public AgentSpan activeSpan() {
     final ContinuableScope active = scopeStack().active();
     return active == null ? null : active.span;