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Updated Spanner Dataflow connector samples (#1059)
* Updated Spanner Dataflow connector samples * Make checkstyle happy * First test * Updated the test * Added tests * Makes checkstyle happy * Use system properties * Add add system property * New lines
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dataflow/spanner-io/src/main/java/com/example/dataflow/EstimateSize.java
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| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Copyright 2018 Google Inc. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
|
|
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| package com.example.dataflow; | ||
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| import com.google.cloud.spanner.Struct; | ||
| import org.apache.beam.sdk.transforms.DoFn; | ||
| import org.apache.beam.sdk.transforms.PTransform; | ||
| import org.apache.beam.sdk.transforms.ParDo; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
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| /** | ||
| * Estimates the size of the {@code Struct}. | ||
| */ | ||
| public class EstimateSize extends PTransform<PCollection<Struct>, PCollection<Long>> { | ||
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| public static EstimateSize create() { | ||
| return new EstimateSize(); | ||
| } | ||
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| private EstimateSize() { | ||
| } | ||
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| @Override | ||
| public PCollection<Long> expand(PCollection<Struct> input) { | ||
| return input.apply(ParDo.of(new EstimateStructSizeFn())); | ||
| } | ||
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| /** | ||
| * Estimates the size of a Spanner row. For simplicity, arrays and structs aren't supported. | ||
| */ | ||
| public static class EstimateStructSizeFn extends DoFn<Struct, Long> { | ||
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| @ProcessElement | ||
| public void processElement(ProcessContext c) throws Exception { | ||
| Struct row = c.element(); | ||
| long sum = 0; | ||
| for (int i = 0; i < row.getColumnCount(); i++) { | ||
| if (row.isNull(i)) { | ||
| continue; | ||
| } | ||
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| switch (row.getColumnType(i).getCode()) { | ||
| case BOOL: | ||
| sum += 1; | ||
| break; | ||
| case INT64: | ||
| case FLOAT64: | ||
| sum += 8; | ||
| break; | ||
| case TIMESTAMP: | ||
| case DATE: | ||
| sum += 12; | ||
| break; | ||
| case BYTES: | ||
| sum += row.getBytes(i).length(); | ||
| break; | ||
| case STRING: | ||
| sum += row.getString(i).length(); | ||
| break; | ||
| case ARRAY: | ||
| throw new IllegalArgumentException("Arrays are not supported :("); | ||
| case STRUCT: | ||
| throw new IllegalArgumentException("Structs are not supported :("); | ||
| default: | ||
| throw new IllegalArgumentException("Unsupported type :("); | ||
| } | ||
| } | ||
| c.output(sum); | ||
| } | ||
| } | ||
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| } |
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dataflow/spanner-io/src/main/java/com/example/dataflow/SpannerGroupWrite.java
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| /* | ||
| * Copyright 2018 Google Inc. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
|
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| package com.example.dataflow; | ||
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| import com.google.cloud.Timestamp; | ||
| import com.google.cloud.spanner.Mutation; | ||
| import com.google.common.base.Charsets; | ||
| import com.google.common.hash.Hashing; | ||
| import org.apache.beam.sdk.Pipeline; | ||
| import org.apache.beam.sdk.io.TextIO; | ||
| import org.apache.beam.sdk.io.gcp.spanner.MutationGroup; | ||
| import org.apache.beam.sdk.io.gcp.spanner.SpannerIO; | ||
| import org.apache.beam.sdk.options.Description; | ||
| import org.apache.beam.sdk.options.PipelineOptions; | ||
| import org.apache.beam.sdk.options.PipelineOptionsFactory; | ||
| import org.apache.beam.sdk.options.Validation; | ||
| import org.apache.beam.sdk.transforms.MapElements; | ||
| import org.apache.beam.sdk.transforms.SimpleFunction; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
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| /** | ||
| * This sample demonstrates how to group together mutations when writing to the Cloud Spanner | ||
| * database. | ||
| */ | ||
| public class SpannerGroupWrite { | ||
| public interface Options extends PipelineOptions { | ||
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| @Description("Spanner instance ID to write to") | ||
| @Validation.Required | ||
| String getInstanceId(); | ||
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| void setInstanceId(String value); | ||
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| @Description("Spanner database name to write to") | ||
| @Validation.Required | ||
| String getDatabaseId(); | ||
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| void setDatabaseId(String value); | ||
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| @Description("Singers output filename in the format: singer_id\tfirst_name\tlast_name") | ||
| @Validation.Required | ||
| String getSuspiciousUsersFile(); | ||
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| void setSuspiciousUsersFile(String value); | ||
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| } | ||
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| public static void main(String[] args) { | ||
| Options options = PipelineOptionsFactory.fromArgs(args).withValidation().as(Options.class); | ||
| Pipeline p = Pipeline.create(options); | ||
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| String instanceId = options.getInstanceId(); | ||
| String databaseId = options.getDatabaseId(); | ||
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| String usersIdFile = options.getSuspiciousUsersFile(); | ||
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| PCollection<String> suspiciousUserIds = p.apply(TextIO.read().from(usersIdFile)); | ||
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| final Timestamp timestamp = Timestamp.now(); | ||
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| // [START spanner_dataflow_writegroup] | ||
| PCollection<MutationGroup> mutations = suspiciousUserIds | ||
| .apply(MapElements.via(new SimpleFunction<String, MutationGroup>() { | ||
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| @Override | ||
| public MutationGroup apply(String userId) { | ||
| // Immediately block the user. | ||
| Mutation userMutation = Mutation.newUpdateBuilder("Users") | ||
| .set("id").to(userId) | ||
| .set("state").to("BLOCKED") | ||
| .build(); | ||
| long generatedId = Hashing.sha1().newHasher() | ||
| .putString(userId, Charsets.UTF_8) | ||
| .putLong(timestamp.getSeconds()) | ||
| .putLong(timestamp.getNanos()) | ||
| .hash() | ||
| .asLong(); | ||
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| // Add an entry to pending review requests. | ||
| Mutation pendingReview = Mutation.newInsertOrUpdateBuilder("PendingReviews") | ||
| .set("id").to(generatedId) // Must be deterministically generated. | ||
| .set("userId").to(userId) | ||
| .set("action").to("REVIEW ACCOUNT") | ||
| .set("note").to("Suspicious activity detected.") | ||
| .build(); | ||
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| return MutationGroup.create(userMutation, pendingReview); | ||
| } | ||
| })); | ||
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| mutations.apply(SpannerIO.write() | ||
| .withInstanceId(instanceId) | ||
| .withDatabaseId(databaseId) | ||
| .grouped()); | ||
| // [END spanner_dataflow_writegroup] | ||
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| p.run().waitUntilFinish(); | ||
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| } | ||
|
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| } |
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