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Bucket4j integration with Hazelcast 3.x branch

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/*-
 * ========================LICENSE_START=================================
 * Bucket4j
 * %%
 * Copyright (C) 2015 - 2020 Vladimir Bukhtoyarov
 * %%
 * 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.
 * =========================LICENSE_END==================================
 */
package io.github.bucket4j.grid.hazelcast;

import com.hazelcast.core.IMap;
import io.github.bucket4j.Bucket;
import io.github.bucket4j.BucketConfiguration;
import io.github.bucket4j.grid.GridBucket;
import io.github.bucket4j.grid.GridBucketState;
import io.github.bucket4j.grid.GridProxy;
import io.github.bucket4j.grid.ProxyManager;

import java.io.Serializable;
import java.util.Optional;
import java.util.function.Supplier;

/**
 * Hazelcast specific implementation of {@link ProxyManager}
 *
 * @param  type of key for buckets
 */
public class HazelcastProxyManager implements ProxyManager {

    private final GridProxy gridProxy;

    HazelcastProxyManager(IMap map) {
        if (map == null) {
            throw new IllegalArgumentException("map must not be null");
        }
        this.gridProxy = new HazelcastProxy<>(map);
    }

    @Override
    public Bucket getProxy(K key, Supplier supplier) {
        return GridBucket.createLazyBucket(key, supplier, gridProxy);
    }

    @Override
    public Optional getProxy(K key) {
        return getProxyConfiguration(key)
                .map(configuration -> GridBucket.createLazyBucket(key, () -> configuration, gridProxy));
    }

    @Override
    public Optional getProxyConfiguration(K key) {
        return gridProxy.getConfiguration(key);
    }

}