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KVDaoFactory.java
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KVDaoFactory.java
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/*
* Copyright 2018 (c) Vadim Tsesko <[email protected]>
*
* 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;
import org.jetbrains.annotations.NotNull;
import java.io.File;
import java.io.IOException;
/**
* Custom {@link KVDao} factory
*
* @author Vadim Tsesko <[email protected]>
*/
public final class KVDaoFactory {
private static final long MAX_HEAP = 128 * 1024 * 1024;
private KVDaoFactory() {
// Not instantiatable
}
/**
* Construct a {@link KVDao} instance.
*
* @param data local disk folder to persist the data to
* @return a storage instance
*/
@NotNull
public static KVDao create(@NotNull final File data) throws IOException {
if (Runtime.getRuntime().maxMemory() > MAX_HEAP) {
throw new IllegalStateException("The heap is too big. Consider setting Xmx.");
}
if (!data.exists()) {
throw new IllegalArgumentException("Path doesn't exist: " + data);
}
if (!data.isDirectory()) {
throw new IllegalArgumentException("Path is not a directory: " + data);
}
// TODO: Implement me
throw new UnsupportedOperationException("Implement me!");
}
}