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/**
 * Copyright 2015-2017 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.Session;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheBuilderSpec;
import com.google.common.collect.ImmutableSet;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import zipkin.Span;
import zipkin.internal.Nullable;
import zipkin.internal.Pair;

final class CompositeIndexer {

  private final Set indexers;
  // Shared across all threads as updates can come from any thread.
  // Shared for all indexes to make data management easier (ex. maximumSize)
  private final ConcurrentMap> sharedState;

  CompositeIndexer(Session session, CacheBuilderSpec spec, int bucketCount,
      @Nullable Integer indexTtl) {
    this.sharedState = spec == null ? null :
        CacheBuilder.from(spec).>build().asMap();
    Indexer.Factory factory = new Indexer.Factory(session, indexTtl, sharedState);
    this.indexers = ImmutableSet.of(
        factory.create(new InsertTraceIdByServiceName(bucketCount)),
        factory.create(new InsertTraceIdBySpanName()),
        factory.create(new InsertTraceIdByAnnotation(bucketCount))
    );
  }

  ImmutableSet> index(List spans) {
    ImmutableSet.Builder> result = ImmutableSet.builder();
    for (Indexer optimizer : indexers) {
      result.addAll(optimizer.index(spans));
    }
    return result.build();
  }

  public void clear() {
    sharedState.clear();
  }
}