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Aerospike Java client interface to Aerospike database server
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/*
 * Copyright 2012-2020 Aerospike, Inc.
 *
 * Portions may be licensed to Aerospike, Inc. under one or more contributor
 * license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
 *
 * 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 com.aerospike.client.command;

import java.util.List;

import com.aerospike.client.Key;
import com.aerospike.client.Record;
import com.aerospike.client.cluster.Cluster;
import com.aerospike.client.policy.BatchPolicy;

public final class BatchExecutor {

	public static void execute(
		Cluster cluster,
		BatchPolicy policy,
		Key[] keys,
		boolean[] existsArray,
		Record[] records,
		String[] binNames,
		int readAttr
	) {
		if (keys.length == 0) {
			return;
		}

		List batchNodes = BatchNode.generateList(cluster, policy, keys);

		if (policy.maxConcurrentThreads == 1 || batchNodes.size() <= 1) {
			// Run batch requests sequentially in same thread.
			for (BatchNode batchNode : batchNodes) {
				if (records != null) {
					MultiCommand command = new Batch.GetArrayCommand(cluster, null, batchNode, policy, keys, binNames, records, readAttr);
					command.execute();
				}
				else {
					MultiCommand command = new Batch.ExistsArrayCommand(cluster, null, batchNode, policy, keys, existsArray);
					command.execute();
				}
			}
		}
		else {
			// Run batch requests in parallel in separate threads.
			//
			// Multiple threads write to the record/exists array, so one might think that
			// volatile or memory barriers are needed on the write threads and this read thread.
			// This should not be necessary here because it happens in Executor which does a
			// volatile write (completedCount.incrementAndGet()) at the end of write threads
			// and a synchronized waitTillComplete() in this thread.
			Executor executor = new Executor(cluster, batchNodes.size() * 2);

			// Initialize threads.
			for (BatchNode batchNode : batchNodes) {
				if (records != null) {
					MultiCommand command = new Batch.GetArrayCommand(cluster, executor, batchNode, policy, keys, binNames, records, readAttr);
					executor.addCommand(command);
				}
				else {
					MultiCommand command = new Batch.ExistsArrayCommand(cluster, executor, batchNode, policy, keys, existsArray);
					executor.addCommand(command);
				}
			}
			executor.execute(policy.maxConcurrentThreads);
		}
	}
}