minimal HarnessManager Interface (#2)

Write minimal interface for Flink HarnessManager and related classes.

This defines a minimal interface for a Flink HarnessManager,
as well as the related interfaces of EnvironmentSession and
ArtifactSource.

Add beam-runners-java-fn-execution to the flink-runner's
maven and gradle dependencies for planned work on
integrating with the beam portability framework.

This will be necessary to interact with protobufs related to
the artifact API while implementing ArtifactService and
related classes.

runners/flink/build.gradle

@@ -53,6 +53,7 @@ dependencies {
   shadow project(path: ":sdks:java:core", configuration: "shadow")
   shadow project(path: ":runners:core-java", configuration: "shadow")
   shadow project(path: ":runners:core-construction-java", configuration: "shadow")
+  shadow project(path: ":runners:java-fn-execution", configuration: "shadow")
   shadow library.java.jackson_annotations
   shadow library.java.findbugs_jsr305
   shadow library.java.slf4j_api

runners/flink/pom.xml

@@ -251,6 +251,17 @@
       </exclusions>
     </dependency>
 
+    <dependency>
+      <groupId>org.apache.beam</groupId>
+      <artifactId>beam-runners-java-fn-execution</artifactId>
+      <exclusions>
+        <exclusion>
+          <groupId>org.slf4j</groupId>
+          <artifactId>slf4j-jdk14</artifactId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+
     <dependency>
       <groupId>org.apache.beam</groupId>
       <artifactId>beam-model-pipeline</artifactId>

runners/flink/src/main/java/org/apache/beam/runners/flink/execution/EnvironmentSession.java

@@ -0,0 +1,47 @@
+/*
+ * 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.flink.execution;
+
+import org.apache.beam.model.pipeline.v1.RunnerApi.Environment;
+import org.apache.beam.runners.fnexecution.artifact.ArtifactSource;
+import org.apache.beam.runners.fnexecution.control.SdkHarnessClient;
+
+/**
+ * A handle to an {@link Environment} managed by a {@link SdkHarnessManager}.
+ * Closing the session indicates to the session's {@link SdkHarnessManager}
+ * that it can no longer use session resources such as its
+ * {@link ArtifactSource}.
+ */
+public interface EnvironmentSession extends AutoCloseable {
+
+  /**
+   * Get the environment that the session uses.
+   */
+  Environment getEnvironment();
+
+  /**
+   * Get the ArtifactSource that the session uses.
+   */
+  ArtifactSource getArtifactSource();
+
+  /**
+   * Get an {@link SdkHarnessClient} that can communicate with an instance of the environment.
+   */
+  SdkHarnessClient getClient();
+}

runners/flink/src/main/java/org/apache/beam/runners/flink/execution/SdkHarnessManager.java

@@ -0,0 +1,37 @@
+/*
+ * 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.flink.execution;
+
+import org.apache.beam.model.pipeline.v1.RunnerApi.Environment;
+import org.apache.beam.runners.fnexecution.artifact.ArtifactSource;
+
+/**
+ * A long-lived class to manage SDK harness container instances on behalf of
+ * shorter-lived Flink operators.
+ */
+public interface SdkHarnessManager {
+  /**
+   * Get a new {@link EnvironmentSession} to an {@link Environment} container
+   * instance, creating a new instance if necessary.
+   *
+   * @param environment The environment specification for the desired session.
+   * @param artifactSource An artifact source that can be used during creation.
+   */
+  EnvironmentSession getSession(String jobId, Environment environment, ArtifactSource artifactSource);
+}

runners/flink/src/main/java/org/apache/beam/runners/flink/execution/package-info.java

@@ -0,0 +1,22 @@
+/*
+ * 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.
+ */
+
+/**
+ * Internal metrics implementation of the Beam runner for Apache Flink.
+ */
+package org.apache.beam.runners.flink.execution;

runners/java-fn-execution/build.gradle

@@ -33,6 +33,7 @@ dependencies {
   compile library.java.guava
   shadow project(path: ":model:pipeline", configuration: "shadow")
   shadow project(path: ":model:fn-execution", configuration: "shadow")
+  shadow project(path: ":model:job-management", configuration: "shadow")
   shadow project(path: ":sdks:java:core", configuration: "shadow")
   shadow project(path: ":sdks:java:fn-execution", configuration: "shadow")
   shadow library.java.grpc_core

runners/java-fn-execution/pom.xml

@@ -43,6 +43,11 @@
       <artifactId>beam-model-fn-execution</artifactId>
     </dependency>
 
+    <dependency>
+      <groupId>org.apache.beam</groupId>
+      <artifactId>beam-model-job-management</artifactId>
+    </dependency>
+
     <dependency>
       <groupId>org.apache.beam</groupId>
       <artifactId>beam-sdks-java-fn-execution</artifactId>

runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/artifact/ArtifactSource.java

@@ -0,0 +1,40 @@
+/*
+ * 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.artifact;
+
+import org.apache.beam.model.jobmanagement.v1.ArtifactApi;
+
+import java.util.stream.Stream;
+
+/**
+ * Makes artifacts available to an ArtifactRetrievalService by
+ * encapsulating runner-specific resources.
+ */
+public interface ArtifactSource {
+
+  /**
+   * Get the artifact manifest available from this source.
+   */
+  ArtifactApi.Manifest getManifest();
+
+  /**
+   * Get an artifact by its name.
+   */
+  Stream<ArtifactApi.ArtifactChunk> getArtifact(String name);
+}