InsertTraceIdByAnnotation.java

/**
 * Copyright 2015-2016 The OpenZipkin Authors
 *
 * 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 zipkin.storage.cassandra;

import com.datastax.driver.core.BoundStatement;
import com.datastax.driver.core.querybuilder.Insert;
import com.datastax.driver.core.querybuilder.QueryBuilder;
import java.nio.charset.CharacterCodingException;
import java.util.Set;
import java.util.concurrent.ThreadLocalRandom;
import zipkin.Span;

import static zipkin.storage.cassandra.CassandraUtil.annotationKeys;
import static zipkin.storage.cassandra.CassandraUtil.toByteBuffer;

// QueryRequest.annotations/binaryAnnotations
final class InsertTraceIdByAnnotation implements Indexer.IndexSupport {
  private static final ThreadLocalRandom RAND = ThreadLocalRandom.current();
  private final int bucketCount;

  InsertTraceIdByAnnotation(int bucketCount) {
    this.bucketCount = bucketCount;
  }

  @Override public String table() {
    return Tables.ANNOTATIONS_INDEX;
  }

  @Override public Insert declarePartitionKey(Insert insert) {
    return insert.value("annotation", QueryBuilder.bindMarker("annotation"))
        .value("bucket", QueryBuilder.bindMarker("bucket"));
  }

  @Override
  public BoundStatement bindPartitionKey(BoundStatement bound, String partitionKey) {
    try {
      return bound.setInt("bucket", RAND.nextInt(bucketCount))
          .setBytes("annotation", toByteBuffer(partitionKey));
    } catch (CharacterCodingException e) {
      throw new IllegalArgumentException(e);
    }
  }

  @Override
  public Set<String> partitionKeys(Span span) {
    return annotationKeys(span);
  }
}