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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.ExecutionCallback;
import com.hazelcast.core.IMap;
import com.hazelcast.map.EntryProcessor;
import io.github.bucket4j.BucketConfiguration;
import io.github.bucket4j.Nothing;
import io.github.bucket4j.grid.CommandResult;
import io.github.bucket4j.grid.GridBucketState;
import io.github.bucket4j.grid.GridCommand;
import io.github.bucket4j.grid.GridProxy;
import io.github.bucket4j.grid.jcache.JCacheEntryProcessor;

import java.io.Serializable;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;

public class HazelcastProxy implements GridProxy {

    private final IMap cache;

    public HazelcastProxy(IMap cache) {
        this.cache = cache;
    }

    @Override
    public  CommandResult execute(K key, GridCommand command) {
        JCacheEntryProcessor entryProcessor = JCacheEntryProcessor.executeProcessor(command);
        return (CommandResult) cache.executeOnKey(key, adoptEntryProcessor(entryProcessor));
    }

    @Override
    public void createInitialState(K key, BucketConfiguration configuration) {
        JCacheEntryProcessor entryProcessor = JCacheEntryProcessor.initStateProcessor(configuration);
        cache.executeOnKey(key, adoptEntryProcessor(entryProcessor));
    }

    @Override
    public  T createInitialStateAndExecute(K key, BucketConfiguration configuration, GridCommand command) {
        JCacheEntryProcessor entryProcessor = JCacheEntryProcessor.initStateAndExecuteProcessor(command, configuration);
        CommandResult result = (CommandResult) cache.executeOnKey(key, adoptEntryProcessor(entryProcessor));
        return result.getData();
    }

    @Override
    public  CompletableFuture> executeAsync(K key, GridCommand command) {
        JCacheEntryProcessor entryProcessor = JCacheEntryProcessor.executeProcessor(command);
        return invokeAsync(key, entryProcessor);
    }

    @Override
    public  CompletableFuture createInitialStateAndExecuteAsync(K key, BucketConfiguration configuration, GridCommand command) {
        JCacheEntryProcessor entryProcessor = JCacheEntryProcessor.initStateAndExecuteProcessor(command, configuration);
        CompletableFuture> result = invokeAsync(key, entryProcessor);
        return result.thenApply(CommandResult::getData);
    }

    @Override
    public Optional getConfiguration(K key) {
        GridBucketState state = cache.get(key);
        if (state == null) {
            return Optional.empty();
        } else {
            return Optional.of(state.getConfiguration());
        }
    }

    @Override
    public boolean isAsyncModeSupported() {
        return true;
    }

    private   EntryProcessor adoptEntryProcessor(final JCacheEntryProcessor entryProcessor) {
        return new HazelcastEntryProcessorAdapter<>(entryProcessor);
    }

    private  CompletableFuture> invokeAsync(K key, JCacheEntryProcessor entryProcessor) {
        CompletableFuture> future = new CompletableFuture<>();
        cache.submitToKey(key, adoptEntryProcessor(entryProcessor), new ExecutionCallback() {
            @Override
            public void onResponse(Object response) {
                future.complete((CommandResult) response);
            }

            @Override
            public void onFailure(Throwable t) {
                future.completeExceptionally(t);
            }
        });
        return future;
    }

}