[
https://issues.apache.org/jira/browse/BEAM-6747?focusedWorklogId=218378&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-218378
]
ASF GitHub Bot logged work on BEAM-6747:
----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Mar/19 00:20
Start Date: 26/Mar/19 00:20
Worklog Time Spent: 10m
Work Description: ihji commented on pull request #7954: [BEAM-6747]
Adding ExternalTransform in JavaSDK
URL: https://github.com/apache/beam/pull/7954#discussion_r268903658
##########
File path:
runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/External.java
##########
@@ -0,0 +1,240 @@
+/*
+ * 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.core.construction;
+
+import static
org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkArgument;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import javax.annotation.Nullable;
+import org.apache.beam.model.expansion.v1.ExpansionApi;
+import org.apache.beam.model.pipeline.v1.Endpoints;
+import org.apache.beam.model.pipeline.v1.RunnerApi;
+import org.apache.beam.sdk.Pipeline;
+import org.apache.beam.sdk.runners.AppliedPTransform;
+import org.apache.beam.sdk.transforms.Impulse;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PCollectionTuple;
+import org.apache.beam.sdk.values.PInput;
+import org.apache.beam.sdk.values.POutput;
+import org.apache.beam.sdk.values.PValue;
+import org.apache.beam.sdk.values.TupleTag;
+import org.apache.beam.vendor.grpc.v1p13p1.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.grpc.v1p13p1.io.grpc.ManagedChannelBuilder;
+import
org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableMap;
+import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Iterables;
+
+/** Cross-language external transform. */
+public class External {
+ private static final String EXPANDED_TRANSFORM_BASE_NAME = "external";
+ private static final String IMPULSE_PREFIX = "IMPULSE";
+ private static AtomicInteger namespaceCounter = new AtomicInteger(0);
+
+ private static final ExpansionServiceClientFactory DEFAULT =
+ new DefaultExpansionServiceClientFactory(
+ endPoint ->
ManagedChannelBuilder.forTarget(endPoint.getUrl()).usePlaintext().build());
+
+ private static int getFreshNamespaceIndex() {
+ return namespaceCounter.getAndIncrement();
+ }
+
+ public static <OutputT> SingleOutputExpandableTransform<OutputT> of(
+ String urn, byte[] payload, String endpoint) {
Review comment:
I didn't modify the payload type since its Python counterpart has the same
type signature:
https://github.com/apache/beam/blob/0b71f541e93f3bd69af87ad8a6db46ccb4a01ddc/sdks/python/apache_beam/transforms/external.py#L53
I think we can still provide a nicer way for constructing the payload with
high-level wrappers.
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Issue Time Tracking
-------------------
Worklog Id: (was: 218378)
Time Spent: 2h 40m (was: 2.5h)
> Adding ExternalTransform in JavaSDK
> -----------------------------------
>
> Key: BEAM-6747
> URL: https://issues.apache.org/jira/browse/BEAM-6747
> Project: Beam
> Issue Type: Improvement
> Components: runner-core
> Reporter: Heejong Lee
> Assignee: Heejong Lee
> Priority: Major
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> Adding Java counterpart of Python ExternalTransform for testing Python
> transforms from pipelines in Java SDK.
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