feat(core): Add configurable IScopesStorageFactory to SentryOptions

Allow users to provide a custom IScopesStorage factory via
SentryOptions.setScopesStorageFactory(). When set, the custom factory
takes precedence over the default auto-detection logic.

Fixes #5193

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: adinauer

sentry/api/sentry.api

@@ -1060,6 +1060,10 @@ public abstract interface class io/sentry/IScopesStorage {
 	public abstract fun set (Lio/sentry/IScopes;)Lio/sentry/ISentryLifecycleToken;
 }
 
+public abstract interface class io/sentry/IScopesStorageFactory {
+	public abstract fun create ()Lio/sentry/IScopesStorage;
+}
+
 public abstract interface class io/sentry/ISentryClient {
 	public abstract fun captureBatchedLogEvents (Lio/sentry/SentryLogEvents;)V
 	public abstract fun captureBatchedMetricsEvents (Lio/sentry/SentryMetricsEvents;)V
@@ -3629,6 +3633,7 @@ public class io/sentry/SentryOptions {
 	public fun getReplayController ()Lio/sentry/ReplayController;
 	public fun getSampleRate ()Ljava/lang/Double;
 	public fun getScopeObservers ()Ljava/util/List;
+	public fun getScopesStorageFactory ()Lio/sentry/IScopesStorageFactory;
 	public fun getSdkVersion ()Lio/sentry/protocol/SdkVersion;
 	public fun getSentryClientName ()Ljava/lang/String;
 	public fun getSerializer ()Lio/sentry/ISerializer;
@@ -3781,6 +3786,7 @@ public class io/sentry/SentryOptions {
 	public fun setRelease (Ljava/lang/String;)V
 	public fun setReplayController (Lio/sentry/ReplayController;)V
 	public fun setSampleRate (Ljava/lang/Double;)V
+	public fun setScopesStorageFactory (Lio/sentry/IScopesStorageFactory;)V
 	public fun setSdkVersion (Lio/sentry/protocol/SdkVersion;)V
 	public fun setSendClientReports (Z)V
 	public fun setSendDefaultPii (Z)V

sentry/src/main/java/io/sentry/IScopesStorageFactory.java

@@ -0,0 +1,11 @@
+package io.sentry;
+
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+/** Factory for creating custom {@link IScopesStorage} implementations. */
+@ApiStatus.Experimental
+public interface IScopesStorageFactory {
+  @NotNull
+  IScopesStorage create();
+}

sentry/src/main/java/io/sentry/Sentry.java

@@ -439,7 +439,10 @@ private static void initFatalLogger(final @NotNull SentryOptions options) {
 
   private static void initScopesStorage(SentryOptions options) {
     getScopesStorage().close();
-    if (SentryOpenTelemetryMode.OFF == options.getOpenTelemetryMode()) {
+    if (options.getScopesStorageFactory() != null) {
+      scopesStorage = options.getScopesStorageFactory().create();
+      scopesStorage.init();
+    } else if (SentryOpenTelemetryMode.OFF == options.getOpenTelemetryMode()) {
       scopesStorage = new DefaultScopesStorage();
     } else {
       scopesStorage = ScopesStorageFactory.create(new LoadClass(), NoOpLogger.getInstance());

sentry/src/main/java/io/sentry/SentryOptions.java

@@ -557,6 +557,8 @@ public class SentryOptions {
 
   private @NotNull ISpanFactory spanFactory = NoOpSpanFactory.getInstance();
 
+  private @Nullable IScopesStorageFactory scopesStorageFactory;
+
   /**
    * Profiling traces rate. 101 hz means 101 traces in 1 second. Defaults to 101 to avoid possible
    * lockstep sampling. More on
@@ -3557,6 +3559,27 @@ public void setSpanFactory(final @NotNull ISpanFactory spanFactory) {
     this.spanFactory = spanFactory;
   }
 
+  /**
+   * Returns the custom scopes storage factory, or null if auto-detection should be used.
+   *
+   * @return the custom scopes storage factory or null
+   */
+  @ApiStatus.Experimental
+  public @Nullable IScopesStorageFactory getScopesStorageFactory() {
+    return scopesStorageFactory;
+  }
+
+  /**
+   * Sets a custom factory for creating {@link IScopesStorage} implementations. When set, this
+   * factory takes precedence over the default auto-detection logic.
+   *
+   * @param scopesStorageFactory the custom factory, or null to use auto-detection
+   */
+  @ApiStatus.Experimental
+  public void setScopesStorageFactory(final @Nullable IScopesStorageFactory scopesStorageFactory) {
+    this.scopesStorageFactory = scopesStorageFactory;
+  }
+
   @ApiStatus.Experimental
   public @NotNull SentryOptions.Logs getLogs() {
     return logs;

sentry/src/test/java/io/sentry/SentryOptionsTest.kt

@@ -964,4 +964,27 @@ class SentryOptionsTest {
     options.logs.loggerBatchProcessorFactory = mock
     assertSame(mock, options.logs.loggerBatchProcessorFactory)
   }
+
+  @Test
+  fun `scopesStorageFactory is null by default`() {
+    val options = SentryOptions()
+    assertNull(options.scopesStorageFactory)
+  }
+
+  @Test
+  fun `scopesStorageFactory can be set and retrieved`() {
+    val options = SentryOptions()
+    val factory = IScopesStorageFactory { DefaultScopesStorage() }
+    options.scopesStorageFactory = factory
+    assertSame(factory, options.scopesStorageFactory)
+  }
+
+  @Test
+  fun `scopesStorageFactory can be set to null`() {
+    val options = SentryOptions()
+    val factory = IScopesStorageFactory { DefaultScopesStorage() }
+    options.scopesStorageFactory = factory
+    options.scopesStorageFactory = null
+    assertNull(options.scopesStorageFactory)
+  }
 }

sentry/src/test/java/io/sentry/SentryTest.kt

@@ -1723,4 +1723,50 @@ class SentryTest {
       javaClass.injectForField("name", "io.sentry.SentryTest\$CustomAndroidOptions")
     }
   }
+
+  @Test
+  fun `when scopesStorageFactory is set, it is used instead of default storage`() {
+    val customStorage = mock<IScopesStorage>()
+    whenever(customStorage.set(anyOrNull())).thenReturn(mock())
+    whenever(customStorage.get()).thenReturn(null)
+
+    initForTest {
+      it.dsn = dsn
+      it.scopesStorageFactory = IScopesStorageFactory { customStorage }
+    }
+
+    verify(customStorage).init()
+    verify(customStorage).set(any())
+  }
+
+  @Test
+  fun `when scopesStorageFactory is null, default auto-detection is used`() {
+    initForTest {
+      it.dsn = dsn
+      it.scopesStorageFactory = null
+    }
+
+    // Should work normally with DefaultScopesStorage
+    val scopes = Sentry.getCurrentScopes()
+    assertFalse(scopes.isNoOp)
+  }
+
+  @Test
+  fun `custom scopes storage from factory is functional`() {
+    val backingStorage = DefaultScopesStorage()
+    val factoryCalled = AtomicBoolean(false)
+
+    initForTest {
+      it.dsn = dsn
+      it.scopesStorageFactory = IScopesStorageFactory {
+        factoryCalled.set(true)
+        backingStorage
+      }
+    }
+
+    assertTrue(factoryCalled.get())
+
+    val scopes = Sentry.getCurrentScopes()
+    assertFalse(scopes.isNoOp)
+  }
 }