content: /*
   * 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 com.datastax.dse.driver.api.core.cql.continuous.reactive;
  
  import com.datastax.dse.driver.api.core.cql.continuous.ContinuousSession;
  import com.datastax.dse.driver.api.core.cql.reactive.ReactiveRow;
  import com.datastax.dse.driver.internal.core.cql.continuous.reactive.ContinuousCqlRequestReactiveProcessor;
  import com.datastax.oss.driver.api.core.cql.SimpleStatement;
  import com.datastax.oss.driver.api.core.cql.Statement;
  import com.datastax.oss.driver.api.core.session.Session;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import java.util.Objects;
  import org.reactivestreams.Publisher;
  
  /**
   * A {@link Session} that offers utility methods to issue queries using reactive-style programming
   * and continuous paging, combined together.
   *
   * <p>Methods in this interface all return {@link ContinuousReactiveResultSet} instances. All
   * publishers support multiple subscriptions in a unicast fashion: each subscriber triggers an
   * independent request execution and gets its own copy of the results.
   *
   * <p>Also, note that the publishers may emit items to their subscribers on an internal driver IO
   * thread. Subscriber implementors are encouraged to abide by <a
   * href="https://github.com/reactive-streams/reactive-streams-jvm#2.2">Reactive Streams
   * Specification rule 2.2</a> and avoid performing heavy computations or blocking calls inside
   * {@link org.reactivestreams.Subscriber#onNext(Object) onNext} calls, as doing so could slow down
   * the driver and impact performance. Instead, they should asynchronously dispatch received signals
   * to their processing logic.
   *
   * @see ReactiveRow
   */
  public interface ContinuousReactiveSession extends Session {
  
    /**
     * Returns a {@link Publisher} that, once subscribed to, executes the given query continuously and
     * emits all the results.
     *
     * <p>See {@link ContinuousSession} for more explanations about continuous paging.
     *
     * <p>This feature is only available with DataStax Enterprise. Executing continuous queries
     * against an Apache Cassandra&reg; cluster will result in a runtime error.
     *
     * @param query the query to execute.
     * @return The {@link Publisher} that will publish the returned results.
     */
    @NonNull
    default ContinuousReactiveResultSet executeContinuouslyReactive(@NonNull String query) {
      return executeContinuouslyReactive(SimpleStatement.newInstance(query));
    }
  
    /**
     * Returns a {@link Publisher} that, once subscribed to, executes the given query continuously and
     * emits all the results.
     *
     * <p>See {@link ContinuousSession} for more explanations about continuous paging.
     *
     * <p>This feature is only available with DataStax Enterprise. Executing continuous queries
     * against an Apache Cassandra&reg; cluster will result in a runtime error.
     *
     * @param statement the statement to execute.
     * @return The {@link Publisher} that will publish the returned results.
     */
    @NonNull
    default ContinuousReactiveResultSet executeContinuouslyReactive(@NonNull Statement<?> statement) {
      return Objects.requireNonNull(
          execute(statement, ContinuousCqlRequestReactiveProcessor.CONTINUOUS_REACTIVE_RESULT_SET));
    }
  }
  