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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 io.dstream;

import java.util.Properties;
import java.util.concurrent.Future;
import java.util.stream.Stream;

/**
 * Strategy for implementing {@link DStream} execution delegates.
 * Execution delegates are gateways to execution systems responsible for executing
 * {@link DStreamExecutionGraph} created upon invocation of {@link DStream#executeAs(String)}
 * operation.
 */
public interface DStreamExecutionDelegate {

	/**
	 * Executes {@link DStreamExecutionGraph} groups returning a {@link Future} of the results.
	 * 

	 *
	 * @param executionName the name of this execution
	 * @param executionConfig execution configuration properties
	 * @param operationsGroups array of {@link DStreamExecutionGraph} to execute
	 * @return a {@link Future} of results, where result is represented as {@link Stream}
	 *         containing {@link Stream}s representing each partition in the overall result.

	 *         While this method's signature implies async invocation, individual
	 *         implementations could still opt out for sync invocation always returning only
	 *         realized (completed) {@link Future}
	 */
	Future>> execute(String executionName, Properties executionConfig, DStreamExecutionGraph... operationsGroups);

	/**
	 * Returns {@link Runnable} which contains logic relevant to closing of the result {@link Stream}.
	 * The returned {@link Runnable} will be executed when resulting {@link Stream#close()} is called.
	 */
	Runnable getCloseHandler();
}