Deprecate HTTP client with warning.

sdk-actors/src/main/java/io/dapr/actors/client/ActorClient.java

@@ -21,13 +21,17 @@
 import io.grpc.Channel;
 import io.grpc.ManagedChannel;
 import io.grpc.ManagedChannelBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Mono;
 
 /**
  * Holds a client for Dapr sidecar communication. ActorClient should be reused.
  */
 public class ActorClient implements AutoCloseable {
 
+  private static final Logger LOGGER = LoggerFactory.getLogger(ActorClient.class);
+
   /**
    * gRPC channel for communication with Dapr sidecar.
    */
@@ -118,7 +122,10 @@ private static ManagedChannel buildManagedChannel(DaprApiProtocol apiProtocol) {
   private static DaprClient buildDaprClient(DaprApiProtocol apiProtocol, Channel grpcManagedChannel) {
     switch (apiProtocol) {
       case GRPC: return new DaprGrpcClient(DaprGrpc.newStub(grpcManagedChannel));
-      case HTTP: return new DaprHttpClient(new DaprHttpBuilder().build());
+      case HTTP: {
+        LOGGER.warn("HTTP client protocol is deprecated and will be removed in Dapr's Java SDK version 1.10.");
+        return new DaprHttpClient(new DaprHttpBuilder().build());
+      }
       default: throw new IllegalStateException("Unsupported protocol: " + apiProtocol.name());
     }
   }

sdk-actors/src/main/java/io/dapr/actors/client/DaprHttpClient.java

@@ -18,9 +18,10 @@
 
 /**
  * DaprClient over HTTP for actor client.
- *
+ * @deprecated This class will be deleted at SDK release version 1.10.
  * @see DaprHttp
  */
+@Deprecated
 class DaprHttpClient implements DaprClient {
 
   /**

sdk/src/main/java/io/dapr/client/DaprApiProtocol.java

@@ -15,7 +15,9 @@
 
 /**
  * Transport protocol for Dapr's API.
+ * @deprecated This class will be deleted at SDK version 1.10.
  */
+@Deprecated
 public enum DaprApiProtocol {
 
   GRPC,

sdk/src/main/java/io/dapr/client/DaprClientBuilder.java

@@ -20,6 +20,8 @@
 import io.dapr.v1.DaprGrpc;
 import io.grpc.ManagedChannel;
 import io.grpc.ManagedChannelBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
 
@@ -29,6 +31,8 @@
  */
 public class DaprClientBuilder {
 
+  private static final Logger LOGGER = LoggerFactory.getLogger(DaprClientBuilder.class);
+
   /**
    * Determine if this builder will create GRPC clients instead of HTTP clients.
    */
@@ -111,6 +115,10 @@ public DaprClientBuilder withStateSerializer(DaprObjectSerializer stateSerialize
    * @throws java.lang.IllegalStateException if any required field is missing
    */
   public DaprClient build() {
+    if (this.apiProtocol == DaprApiProtocol.HTTP) {
+      LOGGER.warn("HTTP client protocol is deprecated and will be removed in Dapr's Java SDK version 1.10.");
+    }
+
     if (this.apiProtocol != this.methodInvocationApiProtocol) {
       return new DaprClientProxy(buildDaprClient(this.apiProtocol), buildDaprClient(this.methodInvocationApiProtocol));
     }

sdk/src/main/java/io/dapr/client/DaprClientHttp.java

@@ -66,10 +66,11 @@
 
 /**
  * An adapter for the HTTP Client.
- *
+ * @deprecated This class will be deleted at SDK release version 1.10.
  * @see io.dapr.client.DaprHttp
  * @see io.dapr.client.DaprClient
  */
+@Deprecated
 public class DaprClientHttp extends AbstractDaprClient {
   /**
    * Header for the conditional operation.

sdk/src/main/java/io/dapr/client/DaprClientProxy.java

@@ -37,11 +37,12 @@
 
 /**
  * Class that delegates to other implementations.
- *
+ * @deprecated This class will be deleted at SDK release version 1.10.
  * @see DaprClient
  * @see DaprClientGrpc
  * @see DaprClientHttp
  */
+@Deprecated
 class DaprClientProxy implements DaprClient {
 
   /**

sdk/src/main/java/io/dapr/client/DaprHttpBuilder.java

@@ -23,7 +23,9 @@
 
 /**
  * A builder for the DaprHttp.
+ * @deprecated Use {@link DaprClientBuilder} instead, this will be removed in a future release.
  */
+@Deprecated
 public class DaprHttpBuilder {
 
   /**

sdk/src/main/java/io/dapr/config/Properties.java

@@ -101,7 +101,9 @@ public class Properties {
 
   /**
    * Determines if Dapr client will use gRPC or HTTP to talk to Dapr's side car.
+   * @deprecated This attribute will be deleted at SDK version 1.10.
    */
+  @Deprecated
   public static final Property<DaprApiProtocol> API_PROTOCOL = new GenericProperty<>(
       "dapr.api.protocol",
       "DAPR_API_PROTOCOL",
@@ -110,7 +112,9 @@ public class Properties {
 
   /**
    * Determines if Dapr client should use gRPC or HTTP for Dapr's service method invocation APIs.
+   * @deprecated This attribute will be deleted at SDK version 1.10.
    */
+  @Deprecated
   public static final Property<DaprApiProtocol> API_METHOD_INVOCATION_PROTOCOL = new GenericProperty<>(
       "dapr.api.methodInvocation.protocol",
       "DAPR_API_METHOD_INVOCATION_PROTOCOL",