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WriteConditionally.java
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WriteConditionally.java
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/*
* Copyright 2019 Google LLC
*
* 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.
*/
package com.example.bigtable;
// [START bigtable_writes_conditional]
import static com.google.cloud.bigtable.data.v2.models.Filters.FILTERS;
import com.google.cloud.bigtable.data.v2.BigtableDataClient;
import com.google.cloud.bigtable.data.v2.models.ConditionalRowMutation;
import com.google.cloud.bigtable.data.v2.models.Filters.Filter;
import com.google.cloud.bigtable.data.v2.models.Mutation;
import com.google.cloud.bigtable.data.v2.models.TableId;
public class WriteConditionally {
private static final String COLUMN_FAMILY_NAME = "stats_summary";
public static void writeConditionally(String projectId, String instanceId, String tableId) {
// String projectId = "my-project-id";
// String instanceId = "my-instance-id";
// String tableId = "mobile-time-series";
try (BigtableDataClient dataClient = BigtableDataClient.create(projectId, instanceId)) {
long timestamp = System.currentTimeMillis() * 1000;
String rowkey = "phone#4c410523#20190501";
Mutation mutation =
Mutation.create().setCell(COLUMN_FAMILY_NAME, "os_name", timestamp, "android");
Filter filter =
FILTERS
.chain()
.filter(FILTERS.family().exactMatch(COLUMN_FAMILY_NAME))
.filter(FILTERS.qualifier().exactMatch("os_build"))
.filter(FILTERS.value().regex("PQ2A\\..*"));
ConditionalRowMutation conditionalRowMutation =
ConditionalRowMutation.create(TableId.of(tableId), rowkey)
.condition(filter)
.then(mutation);
boolean success = dataClient.checkAndMutateRow(conditionalRowMutation);
System.out.printf("Successfully updated row's os_name: %b", success);
} catch (Exception e) {
System.out.println("Error during WriteConditionally: \n" + e.toString());
e.printStackTrace();
}
}
}
// [END bigtable_writes_conditional]