Fork Data Service Libraries to java-fn-execution

runners/core-java/src/main/java/org/apache/beam/runners/core/fn/FnDataReceiver.java

@@ -27,7 +27,11 @@
  *
  * <p>Register a target with a {@link FnDataService} to gain a {@link FnDataReceiver} to which you
  * may write outgoing data.
+ *
+ * @deprecated Runners should depend on the beam-runners-java-fn-execution module for this
+ *     functionality.
  */
+@Deprecated
 public interface FnDataReceiver<T> extends Closeable {
   void accept(T input) throws Exception;
 }

runners/core-java/src/main/java/org/apache/beam/runners/core/fn/FnDataService.java

@@ -27,7 +27,11 @@
  * The {@link FnDataService} is able to forward inbound elements to a consumer and is also a
  * consumer of outbound elements. Callers can register themselves as consumers for inbound elements
  * or can get a handle for a consumer for outbound elements.
+ *
+ * @deprecated Runners should depend on the beam-runners-java-fn-execution module for this
+ *     functionality.
  */
+@Deprecated
 public interface FnDataService {
 
   /**

runners/core-java/src/main/java/org/apache/beam/runners/core/fn/SdkHarnessDoFnRunner.java

@@ -29,7 +29,13 @@
 import org.apache.beam.sdk.util.WindowedValue;
 import org.joda.time.Instant;
 
-/** Processes a bundle by sending it to an SDK harness over the Fn API. */
+/**
+ * Processes a bundle by sending it to an SDK harness over the Fn API.
+ *
+ * @deprecated Runners should interact with the Control and Data plane directly, rather than through
+ *     a {@link DoFnRunner}. Consider the beam-runners-java-fn-execution artifact instead.
+ */
+@Deprecated
 public class SdkHarnessDoFnRunner<InputT, OutputT> implements DoFnRunner<InputT, OutputT> {
 
   private final SdkHarnessClient sdkHarnessClient;

runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/data/FnDataReceiver.java

@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.runners.fnexecution.data;
+
+import java.io.Closeable;
+
+/**
+ * A receiver of streamed data.
+ */
+public interface FnDataReceiver<T> extends Closeable {
+  void accept(T input) throws Exception;
+}

runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/data/package-info.java

@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Utilities for a Beam runner to interact with the Fn API {@link
+ * org.apache.beam.model.fnexecution.v1.BeamFnDataGrpc Data Service} via java abstractions.
+ */
+package org.apache.beam.runners.fnexecution.data;