feat: implement domain scoping (#934)

* initial changes for implementing domain scoping Signed-off-by: jarebudev <23311805+jarebudev@users.noreply.github.com> * completed the rest of the renaming and tidying up Signed-off-by: jarebudev <23311805+jarebudev@users.noreply.github.com> * applied code review suggested changes Signed-off-by: jarebudev <23311805+jarebudev@users.noreply.github.com> * introdcue a dedicated interface for client metadata Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com> * add deprecated default getName to be backward compatible as much as possible Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com> --------- Signed-off-by: jarebudev <23311805+jarebudev@users.noreply.github.com> Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com> Co-authored-by: Kavindu Dodanduwa <Kavindu-Dodan@users.noreply.github.com> Co-authored-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
open-feature · Jun 11, 2024 · 5c0aaaa · 5c0aaaa
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diff --git a/README.md b/README.md
@@ -126,7 +126,7 @@ See [here](https://javadoc.io/doc/dev.openfeature/sdk/latest/) for the Javadocs.
 | ✅     | [Targeting](#targeting)                                               | Contextually-aware flag evaluation using [evaluation context](https://openfeature.dev/docs/reference/concepts/evaluation-context).                            |
 | ✅     | [Hooks](#hooks)                                                       | Add functionality to various stages of the flag evaluation life-cycle.                                                                                        |
 | ✅     | [Logging](#logging)                                                   | Integrate with popular logging packages.                                                                                                                      |
-| ✅     | [Named clients](#named-clients)                                       | Utilize multiple providers in a single application.                                                                                                           |
+| ✅     | [Domains](#domains)                                                   | Logically bind clients with providers.                                                                                                                        |
 | ✅     | [Eventing](#eventing)                                                 | React to state changes in the provider or flag management system.                                                                                             |
 | ✅     | [Shutdown](#shutdown)                                                 | Gracefully clean up a provider during application shutdown.                                                                                                   |
 | ✅     | [Transaction Context Propagation](#transaction-context-propagation)   | Set a specific [evaluation context](https://openfeature.dev/docs/reference/concepts/evaluation-context) for a transaction (e.g. an HTTP request or a thread). |   
@@ -160,7 +160,7 @@ To register a provider in a non-blocking manner, you can use the `setProvider` m
 ```    
 
 In some situations, it may be beneficial to register multiple providers in the same application.
-This is possible using [named clients](#named-clients), which is covered in more details below.
+This is possible using [domains](#domains), which is covered in more detail below.
 
 ### Targeting
 
@@ -219,27 +219,27 @@ Once you've added a hook as a dependency, it can be registered at the global, cl
 
 The Java SDK uses SLF4J. See the [SLF4J manual](https://slf4j.org/manual.html) for complete documentation.
 
-### Named clients
+### Domains
 
-Clients can be given a name.
-A name is a logical identifier which can be used to associate clients with a particular provider.
-If a name has no associated provider, the global provider is used.  
+Clients can be assigned to a domain.
+A domain is a logical identifier which can be used to associate clients with a particular provider.
+If a domain has no associated provider, the global provider is used.  
 
 ```java
 FeatureProvider scopedProvider = new MyProvider();
 
 // registering the default provider
 OpenFeatureAPI.getInstance().setProvider(LocalProvider());
-// registering a named provider
-OpenFeatureAPI.getInstance().setProvider("clientForCache", new CachedProvider());
+// registering a provider to a domain
+OpenFeatureAPI.getInstance().setProvider("my-domain", new CachedProvider());
 
-// a client backed by default provider
+// A client bound to the default provider
 Client clientDefault = OpenFeatureAPI.getInstance().getClient();
-// a client backed by CachedProvider
-Client clientNamed = OpenFeatureAPI.getInstance().getClient("clientForCache");
+// A client bound to the CachedProvider provider
+Client domainScopedClient = OpenFeatureAPI.getInstance().getClient("my-domain");
 ```
 
-Named providers can be set in a blocking or non-blocking way. 
+Providers for domains can be set in a blocking or non-blocking way. 
 For more details, please refer to the [providers](#providers) section.  
 
 ### Eventing

diff --git a/src/main/java/dev/openfeature/sdk/Client.java b/src/main/java/dev/openfeature/sdk/Client.java
@@ -6,7 +6,7 @@
  * Interface used to resolve flags of varying types.
  */
 public interface Client extends Features, EventBus<Client> {
-    Metadata getMetadata();
+    ClientMetadata getMetadata();
 
     /**
      * Return an optional client-level evaluation context.

diff --git a/src/main/java/dev/openfeature/sdk/ClientMetadata.java b/src/main/java/dev/openfeature/sdk/ClientMetadata.java
@@ -0,0 +1,14 @@
+package dev.openfeature.sdk;
+
+/**
+ * Metadata specific to an OpenFeature {@code Client}.
+ */
+public interface ClientMetadata {
+    String getDomain();
+
+    @Deprecated
+    // this is here for compatibility with getName() exposed from {@link Metadata}
+    default String getName() {
+        return getDomain();
+    }
+}
diff --git a/src/main/java/dev/openfeature/sdk/EventDetails.java b/src/main/java/dev/openfeature/sdk/EventDetails.java
@@ -9,7 +9,7 @@
 @Data
 @SuperBuilder(toBuilder = true)
 public class EventDetails extends ProviderEventDetails {
-    private String clientName;
+    private String domain;
     private String providerName;
 
     static EventDetails fromProviderEventDetails(ProviderEventDetails providerEventDetails, String providerName) {
@@ -19,9 +19,9 @@ static EventDetails fromProviderEventDetails(ProviderEventDetails providerEventD
     static EventDetails fromProviderEventDetails(
             ProviderEventDetails providerEventDetails,
             String providerName,
-            String clientName) {
+            String domain) {
         return builder()
-                .clientName(clientName)
+                .domain(domain)
                 .providerName(providerName)
                 .flagsChanged(providerEventDetails.getFlagsChanged())
                 .eventMetadata(providerEventDetails.getEventMetadata())

diff --git a/src/main/java/dev/openfeature/sdk/EventSupport.java b/src/main/java/dev/openfeature/sdk/EventSupport.java
@@ -33,19 +33,19 @@ class EventSupport {
     });
 
     /**
-     * Run all the event handlers associated with this client name.
-     * If the client name is null, handlers attached to unnamed clients will run.
+     * Run all the event handlers associated with this domain.
+     * If the domain is null, handlers attached to unnamed clients will run.
      * 
-     * @param clientName   the client name to run event handlers for, or null
+     * @param domain       the domain to run event handlers for, or null
      * @param event        the event type
      * @param eventDetails the event details
      */
-    public void runClientHandlers(String clientName, ProviderEvent event, EventDetails eventDetails) {
-        clientName = Optional.ofNullable(clientName)
+    public void runClientHandlers(String domain, ProviderEvent event, EventDetails eventDetails) {
+        domain = Optional.ofNullable(domain)
                 .orElse(defaultClientUuid);
 
         // run handlers if they exist
-        Optional.ofNullable(handlerStores.get(clientName))
+        Optional.ofNullable(handlerStores.get(domain))
                 .filter(store -> Optional.of(store).isPresent())
                 .map(store -> store.handlerMap.get(event))
                 .ifPresent(handlers -> handlers
@@ -66,15 +66,14 @@ public void runGlobalHandlers(ProviderEvent event, EventDetails eventDetails) {
     }
 
     /**
-     * Add a handler for the specified client name, or all unnamed clients.
+     * Add a handler for the specified domain, or all unnamed clients.
      * 
-     * @param clientName the client name to add handlers for, or else the unnamed
-     *                   client
+     * @param domain     the domain to add handlers for, or else unnamed
      * @param event      the event type
      * @param handler    the handler function to run
      */
-    public void addClientHandler(String clientName, ProviderEvent event, Consumer<EventDetails> handler) {
-        final String name = Optional.ofNullable(clientName)
+    public void addClientHandler(String domain, ProviderEvent event, Consumer<EventDetails> handler) {
+        final String name = Optional.ofNullable(domain)
                 .orElse(defaultClientUuid);
 
         // lazily create and cache a HandlerStore if it doesn't exist
@@ -90,15 +89,15 @@ public void addClientHandler(String clientName, ProviderEvent event, Consumer<Ev
     /**
      * Remove a client event handler for the specified event type.
      * 
-     * @param clientName the name of the client handler to remove, or null to remove
+     * @param domain     the domain of the client handler to remove, or null to remove
      *                   from unnamed clients
      * @param event      the event type
      * @param handler    the handler ref to be removed
      */
-    public void removeClientHandler(String clientName, ProviderEvent event, Consumer<EventDetails> handler) {
-        clientName = Optional.ofNullable(clientName)
+    public void removeClientHandler(String domain, ProviderEvent event, Consumer<EventDetails> handler) {
+        domain = Optional.ofNullable(domain)
                 .orElse(defaultClientUuid);
-        this.handlerStores.get(clientName).removeHandler(event, handler);
+        this.handlerStores.get(domain).removeHandler(event, handler);
     }
 
     /**
@@ -122,11 +121,11 @@ public void removeGlobalHandler(ProviderEvent event, Consumer<EventDetails> hand
     }
 
     /**
-     * Get all client names for which we have event handlers registered.
+     * Get all domain names for which we have event handlers registered.
      * 
-     * @return set of client names
+     * @return set of domain names
      */
-    public Set<String> getAllClientNames() {
+    public Set<String> getAllDomainNames() {
         return this.handlerStores.keySet();
     }
 

diff --git a/src/main/java/dev/openfeature/sdk/HookContext.java b/src/main/java/dev/openfeature/sdk/HookContext.java
@@ -16,7 +16,7 @@ public class HookContext<T> {
     @NonNull FlagValueType type;
     @NonNull T defaultValue;
     @NonNull EvaluationContext ctx;
-    Metadata clientMetadata;
+    ClientMetadata clientMetadata;
     Metadata providerMetadata;
 
     /**
@@ -30,7 +30,7 @@ public class HookContext<T> {
      * @param <T> type that the flag is evaluating against
      * @return resulting context for hook
      */
-    public static <T> HookContext<T> from(String key, FlagValueType type, Metadata clientMetadata,
+    public static <T> HookContext<T> from(String key, FlagValueType type, ClientMetadata clientMetadata,
                                           Metadata providerMetadata, EvaluationContext ctx, T defaultValue) {
         return HookContext.<T>builder()
                 .flagKey(key)

diff --git a/src/main/java/dev/openfeature/sdk/OpenFeatureAPI.java b/src/main/java/dev/openfeature/sdk/OpenFeatureAPI.java
@@ -1,17 +1,17 @@
 package dev.openfeature.sdk;
 
+import dev.openfeature.sdk.exceptions.OpenFeatureError;
+import dev.openfeature.sdk.internal.AutoCloseableLock;
+import dev.openfeature.sdk.internal.AutoCloseableReentrantReadWriteLock;
+import lombok.extern.slf4j.Slf4j;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Consumer;
 
-import dev.openfeature.sdk.exceptions.OpenFeatureError;
-import dev.openfeature.sdk.internal.AutoCloseableLock;
-import dev.openfeature.sdk.internal.AutoCloseableReentrantReadWriteLock;
-import lombok.extern.slf4j.Slf4j;
-
 /**
  * A global singleton which holds base configuration for the OpenFeature
  * library.
@@ -52,8 +52,8 @@ public Metadata getProviderMetadata() {
         return getProvider().getMetadata();
     }
 
-    public Metadata getProviderMetadata(String clientName) {
-        return getProvider(clientName).getMetadata();
+    public Metadata getProviderMetadata(String domain) {
+        return getProvider(domain).getMetadata();
     }
 
     /**
@@ -66,16 +66,16 @@ public Client getClient() {
     /**
      * {@inheritDoc}
      */
-    public Client getClient(String name) {
-        return getClient(name, null);
+    public Client getClient(String domain) {
+        return getClient(domain, null);
     }
 
     /**
      * {@inheritDoc}
      */
-    public Client getClient(String name, String version) {
+    public Client getClient(String domain, String version) {
         return new OpenFeatureClient(this,
-                name,
+                domain,
                 version);
     }
 
@@ -154,14 +154,14 @@ public void setProvider(FeatureProvider provider) {
     }
 
     /**
-     * Add a provider for a named client.
+     * Add a provider for a domain.
      *
-     * @param clientName The name of the client.
+     * @param domain     The domain to bind the provider to.
      * @param provider   The provider to set.
      */
-    public void setProvider(String clientName, FeatureProvider provider) {
+    public void setProvider(String domain, FeatureProvider provider) {
         try (AutoCloseableLock __ = lock.writeLockAutoCloseable()) {
-            providerRepository.setProvider(clientName,
+            providerRepository.setProvider(domain,
                     provider,
                     this::attachEventProvider,
                     this::emitReady,
@@ -187,14 +187,14 @@ public void setProviderAndWait(FeatureProvider provider) throws OpenFeatureError
     }
 
     /**
-     * Add a provider for a named client and wait for initialization to finish.
+     * Add a provider for a domain and wait for initialization to finish.
      *
-     * @param clientName The name of the client.
+     * @param domain     The domain to bind the provider to.
      * @param provider   The provider to set.
      */
-    public void setProviderAndWait(String clientName, FeatureProvider provider) throws OpenFeatureError {
+    public void setProviderAndWait(String domain, FeatureProvider provider) throws OpenFeatureError {
         try (AutoCloseableLock __ = lock.writeLockAutoCloseable()) {
-            providerRepository.setProvider(clientName,
+            providerRepository.setProvider(domain,
                     provider,
                     this::attachEventProvider,
                     this::emitReady,
@@ -240,13 +240,13 @@ public FeatureProvider getProvider() {
     }
 
     /**
-     * Fetch a provider for a named client. If not found, return the default.
+     * Fetch a provider for a domain. If not found, return the default.
      *
-     * @param name The client name to look for.
+     * @param domain The domain to look for.
      * @return A named {@link FeatureProvider}
      */
-    public FeatureProvider getProvider(String name) {
-        return providerRepository.getProvider(name);
+    public FeatureProvider getProvider(String domain) {
+        return providerRepository.getProvider(domain);
     }
 
     /**
@@ -344,20 +344,20 @@ public OpenFeatureAPI removeHandler(ProviderEvent event, Consumer<EventDetails>
         return this;
     }
 
-    void removeHandler(String clientName, ProviderEvent event, Consumer<EventDetails> handler) {
+    void removeHandler(String domain, ProviderEvent event, Consumer<EventDetails> handler) {
         try (AutoCloseableLock __ = lock.writeLockAutoCloseable()) {
-            eventSupport.removeClientHandler(clientName, event, handler);
+            eventSupport.removeClientHandler(domain, event, handler);
         }
     }
 
-    void addHandler(String clientName, ProviderEvent event, Consumer<EventDetails> handler) {
+    void addHandler(String domain, ProviderEvent event, Consumer<EventDetails> handler) {
         try (AutoCloseableLock __ = lock.writeLockAutoCloseable()) {
             // if the provider is in the state associated with event, run immediately
-            if (Optional.ofNullable(this.providerRepository.getProvider(clientName).getState())
+            if (Optional.ofNullable(this.providerRepository.getProvider(domain).getState())
                     .orElse(ProviderState.READY).matchesEvent(event)) {
-                eventSupport.runHandler(handler, EventDetails.builder().clientName(clientName).build());
+                eventSupport.runHandler(handler, EventDetails.builder().domain(domain).build());
             }
-            eventSupport.addClientHandler(clientName, event, handler);
+            eventSupport.addClientHandler(domain, event, handler);
         }
     }
 
@@ -371,8 +371,8 @@ void addHandler(String clientName, ProviderEvent event, Consumer<EventDetails> h
     private void runHandlersForProvider(FeatureProvider provider, ProviderEvent event, ProviderEventDetails details) {
         try (AutoCloseableLock __ = lock.readLockAutoCloseable()) {
 
-            List<String> clientNamesForProvider = providerRepository
-                    .getClientNamesForProvider(provider);
+            List<String> domainsForProvider = providerRepository
+                    .getDomainsForProvider(provider);
 
             final String providerName = Optional.ofNullable(provider.getMetadata())
                     .map(metadata -> metadata.getName())
@@ -381,20 +381,20 @@ private void runHandlersForProvider(FeatureProvider provider, ProviderEvent even
             // run the global handlers
             eventSupport.runGlobalHandlers(event, EventDetails.fromProviderEventDetails(details, providerName));
 
-            // run the handlers associated with named clients for this provider
-            clientNamesForProvider.forEach(name -> {
-                eventSupport.runClientHandlers(name, event,
-                        EventDetails.fromProviderEventDetails(details, providerName, name));
+            // run the handlers associated with domains for this provider
+            domainsForProvider.forEach(domain -> {
+                eventSupport.runClientHandlers(domain, event,
+                        EventDetails.fromProviderEventDetails(details, providerName, domain));
             });
 
             if (providerRepository.isDefaultProvider(provider)) {
                 // run handlers for clients that have no bound providers (since this is the default)
-                Set<String> allClientNames = eventSupport.getAllClientNames();
-                Set<String> boundClientNames = providerRepository.getAllBoundClientNames();
-                allClientNames.removeAll(boundClientNames);
-                allClientNames.forEach(name -> {
-                    eventSupport.runClientHandlers(name, event,
-                            EventDetails.fromProviderEventDetails(details, providerName, name));
+                Set<String> allDomainNames = eventSupport.getAllDomainNames();
+                Set<String> boundDomains = providerRepository.getAllBoundDomains();
+                allDomainNames.removeAll(boundDomains);
+                allDomainNames.forEach(domain -> {
+                    eventSupport.runClientHandlers(domain, event,
+                            EventDetails.fromProviderEventDetails(details, providerName, domain));
                 });
             }
         }