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Redis based In-Memory Data Grid for Java

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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.pubsub;

import org.redisson.RedissonLockEntry;
import org.redisson.misc.RPromise;

/**
 * 
 * @author Nikita Koksharov
 *
 */
public class SemaphorePubSub extends PublishSubscribe {

    @Override
    protected RedissonLockEntry createEntry(RPromise newPromise) {
        return new RedissonLockEntry(newPromise);
    }

    @Override
    protected void onMessage(RedissonLockEntry value, Long message) {
        value.getLatch().release(message.intValue());
        
        while (true) {
            Runnable runnableToExecute = null;
            synchronized (value) {
                Runnable runnable = value.getListeners().poll();
                if (runnable != null) {
                    if (value.getLatch().tryAcquire()) {
                        runnableToExecute = runnable;
                    } else {
                        value.addListener(runnable);
                    }
                }
            }
            
            if (runnableToExecute != null) {
                runnableToExecute.run();
            } else {
                return;
            }
        }
    }

}