Add ClientOverrideConfiguration getter to SdkClientBuilder. (#3023)

.changes/next-release/feature-AWSSDKforJavav2-21e4b73.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS SDK for Java v2",
+    "contributor": "smswz",
+    "description": "Add `ClientOverrideConfiguration` getter to `SdkClientBuilder`. Allows for changing multiple overrides on a client through the client builder alone."
+}

core/sdk-core/src/main/java/software/amazon/awssdk/core/client/builder/SdkClientBuilder.java

@@ -46,6 +46,13 @@ default B overrideConfiguration(Consumer<ClientOverrideConfiguration.Builder> ov
         return overrideConfiguration(ClientOverrideConfiguration.builder().applyMutation(overrideConfiguration).build());
     }
 
+    /**
+     * Retrieve the current override configuration. This allows further overrides across calls. Can be modified by first
+     * converting to a builder with {@link ClientOverrideConfiguration#toBuilder()}.
+     * @return The existing override configuration for the builder.
+     */
+    ClientOverrideConfiguration overrideConfiguration();
+
     /**
      * Configure the endpoint with which the SDK should communicate.
      */

core/sdk-core/src/main/java/software/amazon/awssdk/core/client/builder/SdkDefaultClientBuilder.java

@@ -114,6 +114,8 @@ public abstract class SdkDefaultClientBuilder<B extends SdkClientBuilder<B, C>,
     private final SdkHttpClient.Builder defaultHttpClientBuilder;
     private final SdkAsyncHttpClient.Builder defaultAsyncHttpClientBuilder;
 
+    private ClientOverrideConfiguration clientOverrideConfiguration;
+
     private SdkHttpClient.Builder httpClientBuilder;
     private SdkAsyncHttpClient.Builder asyncHttpClientBuilder;
 
@@ -150,6 +152,7 @@ public final C build() {
     /**
      * Return a client configuration object, populated with the following chain of priorities.
      * <ol>
+     * <li>Client Configuration Overrides</li>
      * <li>Customer Configuration</li>
      * <li>Service-Specific Defaults</li>
      * <li>Global Defaults</li>
@@ -158,6 +161,9 @@ public final C build() {
     protected final SdkClientConfiguration syncClientConfiguration() {
         SdkClientConfiguration configuration = clientConfiguration.build();
 
+        // Apply overrides
+        configuration = setOverrides(configuration);
+
         // Apply defaults
         configuration = mergeChildDefaults(configuration);
         configuration = mergeGlobalDefaults(configuration);
@@ -173,6 +179,7 @@ protected final SdkClientConfiguration syncClientConfiguration() {
     /**
      * Return a client configuration object, populated with the following chain of priorities.
      * <ol>
+     * <li>Client Configuration Overrides</li>
      * <li>Customer Configuration</li>
      * <li>Implementation/Service-Specific Configuration</li>
      * <li>Global Default Configuration</li>
@@ -181,6 +188,9 @@ protected final SdkClientConfiguration syncClientConfiguration() {
     protected final SdkClientConfiguration asyncClientConfiguration() {
         SdkClientConfiguration configuration = clientConfiguration.build();
 
+        // Apply overrides
+        configuration = setOverrides(configuration);
+
         // Apply defaults
         configuration = mergeChildDefaults(configuration);
         configuration = mergeGlobalDefaults(configuration);
@@ -193,6 +203,39 @@ protected final SdkClientConfiguration asyncClientConfiguration() {
         return configuration;
     }
 
+    private SdkClientConfiguration setOverrides(SdkClientConfiguration configuration) {
+        if (clientOverrideConfiguration == null) {
+            return configuration;
+        }
+
+        SdkClientConfiguration.Builder builder = configuration.toBuilder();
+
+        builder.option(EXECUTION_INTERCEPTORS, clientOverrideConfiguration.executionInterceptors());
+        builder.option(RETRY_POLICY, clientOverrideConfiguration.retryPolicy().orElse(null));
+        builder.option(ADDITIONAL_HTTP_HEADERS, clientOverrideConfiguration.headers());
+        builder.option(SIGNER, clientOverrideConfiguration.advancedOption(SIGNER).orElse(null));
+        builder.option(USER_AGENT_SUFFIX, clientOverrideConfiguration.advancedOption(USER_AGENT_SUFFIX).orElse(null));
+        builder.option(USER_AGENT_PREFIX, clientOverrideConfiguration.advancedOption(USER_AGENT_PREFIX).orElse(null));
+        builder.option(API_CALL_TIMEOUT, clientOverrideConfiguration.apiCallTimeout().orElse(null));
+        builder.option(API_CALL_ATTEMPT_TIMEOUT, clientOverrideConfiguration.apiCallAttemptTimeout().orElse(null));
+        builder.option(DISABLE_HOST_PREFIX_INJECTION,
+                       clientOverrideConfiguration.advancedOption(DISABLE_HOST_PREFIX_INJECTION).orElse(null));
+        builder.option(PROFILE_FILE, clientOverrideConfiguration.defaultProfileFile().orElse(null));
+        builder.option(PROFILE_NAME, clientOverrideConfiguration.defaultProfileName().orElse(null));
+        builder.option(METRIC_PUBLISHERS, clientOverrideConfiguration.metricPublishers());
+        builder.option(EXECUTION_ATTRIBUTES, clientOverrideConfiguration.executionAttributes());
+
+        clientOverrideConfiguration.advancedOption(ENDPOINT_OVERRIDDEN_OVERRIDE).ifPresent(value -> {
+            builder.option(ENDPOINT_OVERRIDDEN, value);
+        });
+
+        clientOverrideConfiguration.advancedOption(SIGNER).ifPresent(s -> {
+            builder.option(SIGNER_OVERRIDDEN, true);
+        });
+
+        return builder.build();
+    }
+
     /**
      * Optionally overridden by child implementations to apply implementation-specific default configuration.
      * (eg. AWS's default credentials providers)
@@ -399,31 +442,24 @@ public final void setAsyncConfiguration(ClientAsyncConfiguration asyncConfigurat
 
     @Override
     public final B overrideConfiguration(ClientOverrideConfiguration overrideConfig) {
-        clientConfiguration.option(EXECUTION_INTERCEPTORS, overrideConfig.executionInterceptors());
-        clientConfiguration.option(RETRY_POLICY, overrideConfig.retryPolicy().orElse(null));
-        clientConfiguration.option(ADDITIONAL_HTTP_HEADERS, overrideConfig.headers());
-        clientConfiguration.option(SIGNER, overrideConfig.advancedOption(SIGNER).orElse(null));
-        clientConfiguration.option(USER_AGENT_SUFFIX, overrideConfig.advancedOption(USER_AGENT_SUFFIX).orElse(null));
-        clientConfiguration.option(USER_AGENT_PREFIX, overrideConfig.advancedOption(USER_AGENT_PREFIX).orElse(null));
-        clientConfiguration.option(API_CALL_TIMEOUT, overrideConfig.apiCallTimeout().orElse(null));
-        clientConfiguration.option(API_CALL_ATTEMPT_TIMEOUT, overrideConfig.apiCallAttemptTimeout().orElse(null));
-        clientConfiguration.option(DISABLE_HOST_PREFIX_INJECTION,
-                                   overrideConfig.advancedOption(DISABLE_HOST_PREFIX_INJECTION).orElse(null));
-        clientConfiguration.option(PROFILE_FILE, overrideConfig.defaultProfileFile().orElse(null));
-        clientConfiguration.option(PROFILE_NAME, overrideConfig.defaultProfileName().orElse(null));
-        clientConfiguration.option(METRIC_PUBLISHERS, overrideConfig.metricPublishers());
-        clientConfiguration.option(EXECUTION_ATTRIBUTES, overrideConfig.executionAttributes());
-        overrideConfig.advancedOption(ENDPOINT_OVERRIDDEN_OVERRIDE).ifPresent(value -> {
-            clientConfiguration.option(ENDPOINT_OVERRIDDEN, value);
-        });
-        overrideConfig.advancedOption(SIGNER).ifPresent(s -> clientConfiguration.option(SIGNER_OVERRIDDEN, true));
+        clientOverrideConfiguration = overrideConfig;
+
         return thisBuilder();
     }
 
     public final void setOverrideConfiguration(ClientOverrideConfiguration overrideConfiguration) {
         overrideConfiguration(overrideConfiguration);
     }
 
+    @Override
+    public final ClientOverrideConfiguration overrideConfiguration() {
+        if (clientOverrideConfiguration == null) {
+            return ClientOverrideConfiguration.builder().build();
+        }
+
+        return clientOverrideConfiguration;
+    }
+
     public final B httpClient(SdkHttpClient httpClient) {
         clientConfiguration.option(SdkClientOption.SYNC_HTTP_CLIENT, httpClient);
         return thisBuilder();