org.apache.beam.sdk.io.gcp.spanner.MutationCellCounter.java Source code

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Here is the source code for org.apache.beam.sdk.io.gcp.spanner.MutationCellCounter.java

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/*
 * 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.sdk.io.gcp.spanner;

import static org.apache.beam.sdk.io.gcp.spanner.MutationUtils.isPointDelete;

import com.google.cloud.spanner.KeySet;
import com.google.cloud.spanner.Mutation;
import com.google.cloud.spanner.Mutation.Op;
import com.google.common.collect.Iterables;

final class MutationCellCounter {
    // Prevent construction.
    private MutationCellCounter() {
    }

    /** Count the number of cells modified by {@link MutationGroup}. */
    public static long countOf(SpannerSchema spannerSchema, MutationGroup mutationGroup) {
        long mutatedCells = 0L;
        for (Mutation mutation : mutationGroup) {
            if (mutation.getOperation() == Op.DELETE) {
                // For single key deletes sum up all the columns in the schema.
                // There is no clear way to estimate range deletes, so they are ignored.
                if (isPointDelete(mutation)) {
                    final KeySet keySet = mutation.getKeySet();

                    final long rows = Iterables.size(keySet.getKeys());
                    mutatedCells += rows * spannerSchema.getCellsMutatedPerRow(mutation.getTable());
                }
            } else {
                // sum the cells of the columns included in the mutation
                for (String column : mutation.getColumns()) {
                    mutatedCells += spannerSchema.getCellsMutatedPerColumn(mutation.getTable(), column);
                }
            }
        }

        return mutatedCells;
    }
}