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Conflict-free replicated data type implementation

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/*
 * Copyright (C) 2020 ActiveJ 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.activej.crdt.storage.cluster;

import io.activej.async.function.AsyncSupplier;
import io.activej.common.annotation.ComponentInterface;
import io.activej.crdt.storage.ICrdtStorage;
import io.activej.promise.Promise;
import io.activej.promise.SettablePromise;
import io.activej.rpc.client.sender.strategy.RpcStrategy;
import org.jetbrains.annotations.Nullable;

import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.function.Function;

@ComponentInterface
public interface IDiscoveryService {

	AsyncSupplier> discover();

	interface PartitionScheme
 {
		Set
 getPartitions();

		ICrdtStorage provideCrdtConnection(P partition);

		RpcStrategy provideRpcConnection(P partition);

		> @Nullable Sharder createSharder(List
 alive);

		> RpcStrategy createRpcStrategy(Function keyGetter);

		boolean isReadValid(Collection
 alive);
	}

	static 
 IDiscoveryService
 of(PartitionScheme partitionScheme) {
		return () -> new AsyncSupplier<>() {
			int i = 0;

			@Override
			public Promise> get() {
				return i++ == 0 ? Promise.of(partitionScheme) : new SettablePromise<>();
			}
		};
	}
}