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Conflict-free replicated data type implementation for DataKernel Framework.

There is a newer version: 3.1.0

/*
 * Copyright (C) 2015-2019 SoftIndex LLC.
 *
 * 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 io.datakernel.crdt;

import io.datakernel.async.process.Cancellable;
import io.datakernel.common.exception.StacklessException;
import io.datakernel.datastream.StreamConsumer;
import io.datakernel.datastream.StreamDataAcceptor;
import io.datakernel.datastream.StreamSupplier;
import io.datakernel.datastream.processor.StreamMapSplitter;
import io.datakernel.eventloop.Eventloop;
import io.datakernel.eventloop.jmx.EventloopJmxMBeanEx;
import io.datakernel.promise.Promise;
import io.datakernel.promise.Promises;
import org.jetbrains.annotations.NotNull;

public final class CrdtRepartitionController, K extends Comparable, S> implements EventloopJmxMBeanEx {
	private final I localPartitionId;
	private final CrdtStorage localClient;
	private final CrdtStorageCluster cluster;

	public CrdtRepartitionController(I localPartitionId, CrdtStorage localClient, CrdtStorageCluster cluster) {
		this.localClient = localClient;
		this.cluster = cluster;
		this.localPartitionId = localPartitionId;
	}

	public static , K extends Comparable, S> CrdtRepartitionController create(CrdtStorageCluster cluster, I localPartitionId) {
		return new CrdtRepartitionController<>(localPartitionId, cluster.getClients().get(localPartitionId), cluster);
	}

	@NotNull
	@Override
	public Eventloop getEventloop() {
		return cluster.getEventloop();
	}

	public Promise repartition() {
		return Promises.toTuple(cluster.upload().toTry(), localClient.remove().toTry(), localClient.download().toTry())
				.then(all -> {
					if (all.getValue1().isSuccess() && all.getValue2().isSuccess() && all.getValue3().isSuccess()) {
						StreamConsumer> cluster = all.getValue1().get();
						StreamConsumer remover = all.getValue2().get();
						StreamSupplier> downloader = all.getValue3().get();

						int index = this.cluster.getOrderedIds().indexOf(localPartitionId);
						StreamMapSplitter> splitter = StreamMapSplitter.create(
								(data, acceptors) -> {
									StreamDataAcceptor