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/**
 * Copyright 2018 Nikita Koksharov
 *
 * 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 org.redisson.rx;

import java.util.concurrent.Callable;

import org.redisson.api.RFuture;
import org.redisson.command.CommandAsyncService;
import org.redisson.connection.ConnectionManager;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.reactivex.Flowable;
import io.reactivex.functions.Action;
import io.reactivex.functions.LongConsumer;
import io.reactivex.processors.ReplayProcessor;

/**
 *
 * @author Nikita Koksharov
 *
 */
public class CommandRxService extends CommandAsyncService implements CommandRxExecutor {

    public CommandRxService(ConnectionManager connectionManager) {
        super(connectionManager);
    }

    @Override
    public  Flowable flowable(final Callable> supplier) {
        final ReplayProcessor p = ReplayProcessor.create();
        return p.doOnRequest(new LongConsumer() {
            @Override
            public void accept(long t) throws Exception {
                RFuture future = supplier.call();
                future.addListener(new FutureListener() {

                    @Override
                    public void operationComplete(final Future future) throws Exception {
                        if (!future.isSuccess()) {
                            p.onError(future.cause());
                            return;
                        }
                        
                        p.doOnCancel(new Action() {
                            @Override
                            public void run() throws Exception {
                                future.cancel(true);
                            }
                        });
                        
                        if (future.getNow() != null) {
                            p.onNext(future.getNow());
                        }
                        p.onComplete();
                    }
                });
            }
        });
    }

}