Remove unused ScopeStateAware API (#8529)

Author: mcculls

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

@@ -60,7 +60,6 @@
 import datadog.trace.bootstrap.instrumentation.api.AgentTracer;
 import datadog.trace.bootstrap.instrumentation.api.BlackHoleSpan;
 import datadog.trace.bootstrap.instrumentation.api.ProfilingContextIntegration;
-import datadog.trace.bootstrap.instrumentation.api.ScopeState;
 import datadog.trace.bootstrap.instrumentation.api.TagContext;
 import datadog.trace.civisibility.interceptor.CiVisibilityApmProtocolInterceptor;
 import datadog.trace.civisibility.interceptor.CiVisibilityTelemetryInterceptor;
@@ -290,11 +289,6 @@ public EndpointTracker onRootSpanStarted(AgentSpan root) {
     return null;
   }
 
-  @Override
-  public ScopeState newScopeState() {
-    return scopeManager.newScopeState();
-  }
-
   public static class CoreTracerBuilder {
 
     private Config config;

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

@@ -19,8 +19,6 @@
 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.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;
@@ -40,8 +38,7 @@
  * 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 ScopeStateAware {
-
+public final class ContinuableScopeManager {
   static final Logger log = LoggerFactory.getLogger(ContinuableScopeManager.class);
   static final RatelimitedLogger ratelimitedLog = new RatelimitedLogger(log, 1, MINUTES);
   static final long iterationKeepAlive =
@@ -307,26 +304,6 @@ ScopeStack scopeStack() {
     return this.tlsScopeStack.get();
   }
 
-  @Override
-  public ScopeState newScopeState() {
-    return new ContinuableScopeState();
-  }
-
-  private class ContinuableScopeState implements ScopeState {
-
-    private ScopeStack localScopeStack = tlsScopeStack.initialValue();
-
-    @Override
-    public void activate() {
-      tlsScopeStack.set(localScopeStack);
-    }
-
-    @Override
-    public void fetchFromActive() {
-      localScopeStack = tlsScopeStack.get();
-    }
-  }
-
   static final class ScopeStackThreadLocal extends ThreadLocal<ScopeStack> {
 
     private final ProfilingContextIntegration profilingContextIntegration;

dd-trace-core/src/test/groovy/datadog/trace/core/scopemanager/ScopeManagerTest.groovy

@@ -6,11 +6,11 @@ import datadog.trace.api.Stateful
 import datadog.trace.api.interceptor.MutableSpan
 import datadog.trace.api.interceptor.TraceInterceptor
 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.AgentSpan
 import datadog.trace.bootstrap.instrumentation.api.ProfilingContextIntegration
 import datadog.trace.common.writer.ListWriter
-import datadog.trace.api.scopemanager.ScopeListener
 import datadog.trace.context.TraceScope
 import datadog.trace.core.CoreTracer
 import datadog.trace.core.DDSpan
@@ -68,91 +68,6 @@ class ScopeManagerTest extends DDCoreSpecification {
     tracer.close()
   }
 
-  def "scope state should be able to fetch and activate state when there is no active span"() {
-    when:
-    def initialScopeState = scopeManager.newScopeState()
-    initialScopeState.fetchFromActive()
-
-    then:
-    scopeManager.active() == null
-
-    when:
-    def newScopeState = scopeManager.newScopeState()
-    newScopeState.activate()
-
-    then:
-    scopeManager.active() == null
-
-    when:
-    def span = tracer.buildSpan("test", "test").start()
-    def scope = tracer.activateSpan(span)
-
-    then:
-    scope.span() == span
-    scopeManager.active() == scope
-
-    when:
-    initialScopeState.activate()
-
-    then:
-    scopeManager.active() == null
-
-    when:
-    newScopeState.activate()
-
-    then:
-    scopeManager.active() == scope
-
-    when:
-    span.finish()
-    scope.close()
-    writer.waitForTraces(1)
-
-    then:
-    writer == [[scope.span()]]
-    scopeManager.active() == null
-
-    when:
-    initialScopeState.activate()
-
-    then:
-    scopeManager.active() == null
-  }
-
-  def "scope state should be able to fetch and activate state when there is an active span"() {
-    when:
-    def span = tracer.buildSpan("test", "test").start()
-    def scope = tracer.activateSpan(span)
-    def initialScopeState = scopeManager.newScopeState()
-    initialScopeState.fetchFromActive()
-
-    then:
-    scope.span() == span
-    scopeManager.active() == scope
-
-    when:
-    def newScopeState = scopeManager.newScopeState()
-    newScopeState.activate()
-
-    then:
-    scopeManager.active() == null
-
-    when:
-    initialScopeState.activate()
-
-    then:
-    scopeManager.active() == scope
-
-    when:
-    span.finish()
-    scope.close()
-    writer.waitForTraces(1)
-
-    then:
-    scopeManager.active() == null
-    writer == [[scope.span()]]
-  }
-
   def "non-ddspan activation results in a continuable scope"() {
     when:
     def scope = scopeManager.activateSpan(noopSpan())

internal-api/src/main/java/datadog/trace/bootstrap/instrumentation/api/AgentTracer.java

@@ -286,7 +286,7 @@ public static TracerAPI get() {
   private AgentTracer() {}
 
   public interface TracerAPI
-      extends datadog.trace.api.Tracer, InternalTracer, EndpointCheckpointer, ScopeStateAware {
+      extends datadog.trace.api.Tracer, InternalTracer, EndpointCheckpointer {
 
     /**
      * Create and start a new span.
@@ -630,11 +630,6 @@ public AgentSpanContext notifyExtensionStart(Object event) {
     @Override
     public void notifyExtensionEnd(AgentSpan span, Object result, boolean isError) {}
 
-    @Override
-    public ScopeState newScopeState() {
-      return null;
-    }
-
     @Override
     public AgentDataStreamsMonitoring getDataStreamsMonitoring() {
       return NoopDataStreamsMonitoring.INSTANCE;