[RRIO] Create Caller and SetupTeardown interfaces (apache#28905)

* Create test Caller and SetupTeardown interfaces

* Update Javadoc

* Defer Call transform to future PR

* Rename package to requestresponseio

* Add username to TODO

sdks/java/io/rrio/build.gradle

@@ -25,9 +25,10 @@ description = "Apache Beam :: SDKS :: Java :: IO :: RequestResponseIO (RRIO)"
 ext.summary = "Support to read from and write to Web APIs"
 
 dependencies {
-    implementation project(path: ":sdks:java:core", configuration: "shadow")
-    implementation library.java.joda_time
-    implementation library.java.vendored_guava_32_1_2_jre
+    // TODO(damondouglas): revert to implementation after project is more fully developed
+    permitUnusedDeclared project(path: ":sdks:java:core", configuration: "shadow")
+    permitUnusedDeclared library.java.joda_time
+    permitUnusedDeclared library.java.vendored_guava_32_1_2_jre
 
     testImplementation project(path: ":sdks:java:core", configuration: "shadowTest")
     testImplementation library.java.junit

sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponseio/Caller.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.io.requestresponseio;
+
+import java.io.Serializable;
+
+/** {@link Caller} interfaces user custom code intended for API calls. */
+public interface Caller<RequestT, ResponseT> extends Serializable {
+
+  /** Calls a Web API with the {@link RequestT} and returns a {@link ResponseT}. */
+  ResponseT call(RequestT request) throws UserCodeExecutionException;
+}

sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponseio/SetupTeardown.java

@@ -0,0 +1,34 @@
+/*
+ * 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.io.requestresponseio;
+
+import java.io.Serializable;
+
+/**
+ * Provided by user and called within {@link org.apache.beam.sdk.transforms.DoFn.Setup} and @{link
+ * org.apache.beam.sdk.transforms.DoFn.Teardown} lifecycle methods of {@link Call}'s {@link
+ * org.apache.beam.sdk.transforms.DoFn}.
+ */
+public interface SetupTeardown extends Serializable {
+
+  /** Called during the {@link org.apache.beam.sdk.transforms.DoFn}'s setup lifecycle method. */
+  void setup() throws UserCodeExecutionException;
+
+  /** Called during the {@link org.apache.beam.sdk.transforms.DoFn}'s teardown lifecycle method. */
+  void teardown() throws UserCodeExecutionException;
+}

sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponseio/UserCodeExecutionException.java

@@ -0,0 +1,38 @@
+/*
+ * 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.io.requestresponseio;
+
+/** Base {@link Exception} for signaling errors in user custom code. */
+public class UserCodeExecutionException extends Exception {
+  public UserCodeExecutionException(String message) {
+    super(message);
+  }
+
+  public UserCodeExecutionException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
+  public UserCodeExecutionException(Throwable cause) {
+    super(cause);
+  }
+
+  public UserCodeExecutionException(
+      String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
+    super(message, cause, enableSuppression, writableStackTrace);
+  }
+}

sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponseio/UserCodeQuotaException.java

@@ -0,0 +1,42 @@
+/*
+ * 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.io.requestresponseio;
+
+/**
+ * Extends {@link UserCodeQuotaException} to allow the user custom code to specifically signal a
+ * Quota or API overuse related error.
+ */
+public class UserCodeQuotaException extends UserCodeExecutionException {
+
+  public UserCodeQuotaException(String message) {
+    super(message);
+  }
+
+  public UserCodeQuotaException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
+  public UserCodeQuotaException(Throwable cause) {
+    super(cause);
+  }
+
+  public UserCodeQuotaException(
+      String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
+    super(message, cause, enableSuppression, writableStackTrace);
+  }
+}

sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponseio/UserCodeTimeoutException.java

@@ -0,0 +1,39 @@
+/*
+ * 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.io.requestresponseio;
+
+/** An extension of {@link UserCodeQuotaException} to specifically signal a user code timeout. */
+public class UserCodeTimeoutException extends UserCodeExecutionException {
+
+  public UserCodeTimeoutException(String message) {
+    super(message);
+  }
+
+  public UserCodeTimeoutException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
+  public UserCodeTimeoutException(Throwable cause) {
+    super(cause);
+  }
+
+  public UserCodeTimeoutException(
+      String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
+    super(message, cause, enableSuppression, writableStackTrace);
+  }
+}

sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponseio/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * 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 provides Beam I/O transform support for safely reading from and writing to Web APIs. */
+package org.apache.beam.io.requestresponseio;

sdks/java/io/rrio/src/test/java/org/apache/beam/io/rrio/CallerTest.java

@@ -0,0 +1,126 @@
+/*
+ * 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.io.rrio;
+
+import static org.apache.beam.sdk.util.Preconditions.checkStateNotNull;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThrows;
+
+import org.apache.beam.io.requestresponseio.Caller;
+import org.apache.beam.io.requestresponseio.UserCodeExecutionException;
+import org.apache.beam.io.requestresponseio.UserCodeQuotaException;
+import org.apache.beam.io.requestresponseio.UserCodeTimeoutException;
+import org.apache.beam.sdk.Pipeline.PipelineExecutionException;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.coders.VarIntCoder;
+import org.apache.beam.sdk.testing.TestPipeline;
+import org.apache.beam.sdk.transforms.Create;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.util.SerializableUtils;
+import org.joda.time.Instant;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for {@link Caller}. */
+@RunWith(JUnit4.class)
+public class CallerTest {
+
+  @Rule public TestPipeline pipeline = TestPipeline.create();
+
+  @Test
+  public void canSerializeImplementingClasses() {
+    SerializableUtils.serializeToByteArray(new CallerImpl());
+  }
+
+  @Test
+  public void canSerializeWhenUsedInDoFn() {
+    pipeline
+        .apply(Create.of(Instant.now()))
+        .apply(ParDo.of(new CallerUsingDoFn<>(new CallerImpl())))
+        .setCoder(StringUtf8Coder.of());
+
+    pipeline.run();
+  }
+
+  @Test
+  public void canSignalQuotaException() {
+    pipeline
+        .apply(Create.of(1))
+        .apply(ParDo.of(new CallerUsingDoFn<>(new CallerThrowsQuotaException())))
+        .setCoder(VarIntCoder.of());
+
+    PipelineExecutionException executionException =
+        assertThrows(PipelineExecutionException.class, pipeline::run);
+    assertEquals(UserCodeQuotaException.class, executionException.getCause().getClass());
+  }
+
+  @Test
+  public void canSignalTimeoutException() {
+    pipeline
+        .apply(Create.of(1))
+        .apply(ParDo.of(new CallerUsingDoFn<>(new CallerThrowsTimeoutException())))
+        .setCoder(VarIntCoder.of());
+
+    PipelineExecutionException executionException =
+        assertThrows(PipelineExecutionException.class, pipeline::run);
+    assertEquals(UserCodeTimeoutException.class, executionException.getCause().getClass());
+  }
+
+  private static class CallerUsingDoFn<RequestT, ResponseT> extends DoFn<RequestT, ResponseT> {
+    private final Caller<RequestT, ResponseT> caller;
+
+    private CallerUsingDoFn(Caller<RequestT, ResponseT> caller) {
+      this.caller = caller;
+    }
+
+    @ProcessElement
+    public void process(@Element RequestT request, OutputReceiver<ResponseT> receiver)
+        throws UserCodeExecutionException {
+      RequestT safeRequest = checkStateNotNull(request);
+      ResponseT response = caller.call(safeRequest);
+      receiver.output(response);
+    }
+  }
+
+  private static class CallerImpl implements Caller<Instant, String> {
+
+    @Override
+    public String call(Instant request) throws UserCodeExecutionException {
+      return request.toString();
+    }
+  }
+
+  private static class CallerThrowsQuotaException implements Caller<Integer, Integer> {
+
+    @Override
+    public Integer call(Integer request) throws UserCodeExecutionException {
+      throw new UserCodeQuotaException("quota");
+    }
+  }
+
+  private static class CallerThrowsTimeoutException implements Caller<Integer, Integer> {
+
+    @Override
+    public Integer call(Integer request) throws UserCodeExecutionException {
+      throw new UserCodeTimeoutException("timeout");
+    }
+  }
+}