[ 
https://issues.apache.org/jira/browse/BEAM-3327?focusedWorklogId=97278&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-97278
 ]

ASF GitHub Bot logged work on BEAM-3327:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 01/May/18 22:27
            Start Date: 01/May/18 22:27
    Worklog Time Spent: 10m 
      Work Description: tgroh commented on a change in pull request #5152: 
[BEAM-3327] Harness Manager Interfaces
URL: https://github.com/apache/beam/pull/5152#discussion_r185350969
 
 

 ##########
 File path: 
runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/artifact/ArtifactSource.java
 ##########
 @@ -0,0 +1,41 @@
+/*
+ * 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 io.grpc.stub.StreamObserver;
+import java.io.IOException;
+import org.apache.beam.model.jobmanagement.v1.ArtifactApi.ArtifactChunk;
+import org.apache.beam.model.jobmanagement.v1.ArtifactApi.Manifest;
+
+/**
+ * Makes artifacts available to an ArtifactRetrievalService by
+ * encapsulating runner-specific resources.
+ */
+public interface ArtifactSource {
+
+  /**
+   * Get the artifact manifest available from this source.
+   */
+  Manifest getManifest() throws IOException;
+
+  /**
+   * Get an artifact by its name.
+   */
+  void getArtifact(String name, StreamObserver<ArtifactChunk> 
responseObserver);
 
 Review comment:
   Ideally we'd be able to write a utility that takes the `InputStream` and 
produces the stream of chunks of the appropriate type, and the actual service 
implementation is responsible for pushing the bytes that the source makes 
available, so we don't have to write multiple sources that know how to get 
input streams from names but don't know how to turn those streams into chunks, 
or streams of chunks.

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 97278)
    Time Spent: 26h 40m  (was: 26.5h)

> Add abstractions to manage Environment Instance lifecycles.
> -----------------------------------------------------------
>
>                 Key: BEAM-3327
>                 URL: https://issues.apache.org/jira/browse/BEAM-3327
>             Project: Beam
>          Issue Type: New Feature
>          Components: runner-core
>            Reporter: Thomas Groh
>            Assignee: Axel Magnuson
>            Priority: Major
>              Labels: portability
>          Time Spent: 26h 40m
>  Remaining Estimate: 0h
>
> This permits remote stage execution for arbitrary environments



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