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ServiceFactory.java
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ServiceFactory.java
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/*
* Copyright 2019 (c) Odnoklassniki
*
* 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 ru.mail.polis.service;
import org.jetbrains.annotations.NotNull;
import ru.mail.polis.dao.DAO;
import ru.mail.polis.service.vaddya.HttpService;
import java.io.IOException;
import java.util.Set;
import static ru.mail.polis.service.vaddya.topology.Topology.consistentHashing;
/**
* Constructs {@link Service} instances.
*
* @author Vadim Tsesko
*/
public final class ServiceFactory {
private static final long MAX_HEAP = 256 * 1024 * 1024;
private static final int VNODE_COUNT = 100;
private static final int WORKERS_COUNT = Runtime.getRuntime().availableProcessors();
private ServiceFactory() {
// Not supposed to be instantiated
}
/**
* Construct a storage instance.
*
* @param port port to bind HTTP server to
* @param dao DAO to store the data
* @param topology a list of all cluster endpoints {@code http://<host>:<port>} (including this one)
* @return a storage instance
*/
@NotNull
public static Service create(
final int port,
@NotNull final DAO dao,
@NotNull final Set<String> topology) throws IOException {
if (Runtime.getRuntime().maxMemory() > MAX_HEAP) {
throw new IllegalStateException("The heap is too big. Consider setting Xmx.");
}
if (port <= 0 || 65536 <= port) {
throw new IllegalArgumentException("Port out of range");
}
final var nodes = consistentHashing(topology, "http://localhost:" + port, VNODE_COUNT);
return HttpService.create(port, nodes, dao, WORKERS_COUNT);
}
}